Top Circuits Page 254
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Light emitted by Xenon flash tube is transmitted to phototransistor MRD300 through optical fiber. Sensitive current is amplified to triggering a string of thyristors simultaneously. Therefore, high voltage of 6000V is set on loader R. This optical trigger....
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Low-power two-stage FET transmitter for 80-meter amateur band uses Pierce crystal oscillator that requires no output resonant ci.rcuit. DC milliammeter can be connected across 150-ohm resistor in gate circuit of second transistor to indicate strength of....
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This circuit is used in impulse speed modulation system. In this system, transmitter change impulse speed of modulated beam in optical fiber, let it change around 50kHz center frequency. L14G2 optical transistor convert molulated light to radio-frequency....
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Complete terminal unit and AFSK tone generator for VHF bands synthesizes tones digitally for 170-Hz narrow shift and 850-Hz standard shift found in VHF amateur RTTY bands. Additional feature is PLL circuit that follows drifting signal and copies signals from....
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The 2N2222 circuitry is a three-element, phase-shift oscillator circuit, designed to yield a 1,000-Hz sine wave. The 1,000-Hz sine wave is then applied to the TCG-610 varactor diode, 6 pF at 4 V, which changes the tank capacitance, thus varying the rf....
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As shown in figure, D187 is an UART, it`sRX / TX signalconnectedonoptocoupler N21, N22 and N29, so that put the RS-485communication interface receiver / transmitter D28and microprocessor D211 completely optoelectronicisolated. D197 is a generator, the....
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The figure shows a simplified schematic diagram of main circuit DMA12. It is mainly composed of input circuit and electromagnetic interference (EMI) filter circuit, impulse current limit circuit, the input rectifier filter circuit, the boost / power factor....
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This transmitter uses a 5089 DTMF generator chip and a keypad to generate DTMF signals and modulate them on an IR light beam from an IR LED. Xtal is a 3.579-MHz TV burst crystal....
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This schematic for an experimental data transmitter uses optical fibers and a laser diode. Trans-mission frequency of the free-running oscillator is approximately 3 kHz. R5 might have to be varied to suit your laser diode. IC1 is a CD4093....
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A schematic diagram of the remote-control receiver is shown. The heart of the circuit is IC1, a PIC16C54 8-bit CMOS manufactured by Microchip. The microcontroller stores its data in IC2, a 93LC46 1-kbit serial EEPROM (electrically erasable programmable....
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Related components PDF download: ICL7106CD4036 The LCD electronic thermometer The LCD electronic thermometer circuit is as shown. The temperature sensor KTY10 has good linear relationship between temperature - resistance, and you can connect point A and....
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General purpose hobby circuit of a simple light fence security beeper is presented here. This circuit can be used as a door alarm, gate alarm, pathway alarm, etc. Any 12 Volt dc power supply can power the whole circuit.Working of this circuit is straight....
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Two IC rf modulators convert a suitable baseband video and audio signal up to a low VHF modulated carrier-Channel 2 through 6 in the U.S., and 1 through 3 in Japan-the LM1889 and the LM2889. Both ICs are identical regarding the rf modulation function,....
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This receiver covers 8.5 to 11.5 MHz in two bands and has a sensitivity of under 1 ?V. Nn NE602 mixer feeds a 455-kHz IF amplifier (Q1 and Q2), detector D4, and audio amplifier IC2. Q4 serves as an AGC amplifier coil data is given in the table. The LO is....
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Simple FM transmitter with a single transistor. Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan`s beginning steps. When done right, they provide very clear wireless sound transmission through an ordinary FM....
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Integrated circuit U1 (an NE602 double-balanced mixer) is a combination oscillator and frequency mixer. Signals from the antenna input (at J1) are fed through dc-blocking capacitor C1 to the RF-gain control, R1, and fed to the input of U1 at pins 1 and 2.The....
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Shown is a schematic of a typical transistor AM radio. This circuit uses npn transistors. The circuit is generic; therefore, no specific values are given for some components. This circuit is for ref-erence, to serve as a starting point for experimenters....
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You won`t be disappointed with the performance of this sensitive ultrasonic receiver. It can let you listen to bugs, bats, engines, and virtually any other source of ultrasonic sounds. This circuit uses a piezo tweeter as an ultrasonic microphone, amplifier....
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Here is the diagram of radio controlcarreceiverprinciple circuit. Notes:The choice of transistor Q1 and the bias resistorQ1 1815 9018R1 240K 100K The choice of the high-frequency parameters partFrequency C1 C2 L227M 35P 30P 10uH35M 30P 30P 8.2uH40M 30P 20P....
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A basic circuit of the transistor UHF radio transmitter with surface acoustic wave resonator (SAW), and the SAW is used as a positive feedback element connected between the transistor VT base and LC network in parallel. Figure (b) shows another basic....
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IT usesDTMF encoder output dual tone multi-frequency coded signal to modulate the transmitted carrier frequency. It can form a DTMF encoded radio paging system. The circuit uses DTMF encoding UM97085 and decoding circuit YN9101 circuit to form a small....
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The telecontrol receiving decoding circuit`s performance index shown as the chart are as follow: f radio frequency =27MHz, f audio frequency =5.5KHz, 100% modulation - square-wave; f radio frequency=±600Hz, and the frequency shift keying (FSK) is 160Hz, and....
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This device adopts encoding and decoding circuit MC145026/ MC145027 and RF transmitter / receiver module TDA1808/ TDA1809, and it can beflexibly operated inthe range of 10~120m, and people have no need to change orginal mouse eterior apperance and inside....
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A, B are 2 common contact, outline drawing and pin definition. C is the infrared emission tube shape, pin definition and schematic symbol. CD4069 is the pin definition of inverter pin, and F is the 9013 transistor shape, pin definitions and symbol....
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The circuit monitors PC keyboard activity through five-pin DIN connector J1. When the user presses a key, the keyboard sends a series of negative-going pulses on pin 2. In conjunction with Q1 and C3, the op amp essentially functions as an integrator, which....
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PCA84C-440/441 is the single-chip microcomputer integrated circuit produced by Philips company, it is widely used in domestic and imported large screen color TV, such as Philips and other color television.1. The internal block circuit diagram and pin....
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PIC16C57-RCT is communication single-chip microcomputer integrated circuit, which is widely used in Qiao Xing series of IC card management telephone. 1. Function descriptionPIC16C57-RC integrated circuit includes pulse and dual-tone dialing circuit, memory....
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This circuitry is used for the joggle between computer Z RS-23 serial connecting current ring and current ring circuitry, it can transform the voltage semaphore of transmission into the current semaphore with 20 mA, the biggest speed can reach 1200 bits.....
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This is a circuit intended to be used in basketball shot clock.Notes:To start in 24 seconds; 24s LOAD SW and Reset SW should be push simultaneously. If not, the count will start in 99. Pulse input can be connected to 555 astable multivibrator but must be....
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The 27MHz crystal oscillator circuit is as shown in the figure. The R1, R2, R3 are the biasing resistor, the C6 is the bypass capacitor, the voltage division circuit is composed of the C1, C3, C4 and C2 to control the oscillation strength. The L1 is the....
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Each part of LCD has individual counter, latch, decoder and driver. Pumping signal feeds back to the motherboard of LCD. When the display section is disconnected, the phase and amplitude of the motherboard and display segment drive signal are the same. It....
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As the figure 15-24 shows, the controller circuit is composed of the switch type Hall integrated circuit DN838 and the astable multivibrator (composed of the 555), this circuit can be used in wide range of applications such as the automatic door opening,....
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As the figure 17-1 showns, the camera flash delay circuit can be used to capture the high-speed scene, and you can get a very short exposure time. The light door is composed of the luminous diode and the 3DU type photosensitive tube. When the light is....
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This control circuit is composed of the AC step-down rectifier circuit, the astable multivibrator, the timing control circuit, the optocoupler circuit and the SCR driving circuit.etc. As the figure 17-61 shows. The astable multivibrator is composed of the....
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As the figure 15-22 shows, the doorbell is composed of the monostable timing circuit, the password switch, the NAND gate circuit and the sound circuit.etc. In the limited time, the circuit uses the program to press the password switch, the doorbell circuit....
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This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high. When the switch is opened, the timer produces....
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Made of SS0001 human pyroelectric voice alarm circuit diagram as shown: Pyroelectric infrared language warning device described in this article can be used to prevent electric shock or theft, after a little modification can also be used for automatic light....
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We can use the flash beam to supply the remote control for the AC power devices. The important point of this device is the memory function. It can continuously supply the power to the device. When it acts the second time, the power will be cut off....
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The locker alarm circuit or cashbox watcher can be used to protect a cashbox/locker from unauthorised access. This tried and tested design forms a fool-proof,remotely operated alarm/electromagnetic relay driver that receives its control signal from a....
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Gates U1-a and U1-b of the 4093 quad 2-tnput NAND Schmitt trigger are connected in variable, low-frequency, square-wave oscillator circuits. The output of gate U1-a is connected to one of the inputs of gate U1-b. The square-wave output of gate U1-a modulates....
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This circuit offers open and closed loop contacts (switches 1,2,3) that triggers the alarm ON and stays ON for 5 -10 minutes. The trigering delay (entrance/exit) is 27 seconds. This simple alarm circuit Has also a cancel button for reseting the circuit to....
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Human infrared thermal release alarm can receive the heat releasing infrared ray issued by the body during the day or night, then it willgive the sound and light alarm. It is ideal for electronic guard. Working principle: The circuit uses imported IC,....
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Infrared burglar alarm circuit schematic is shown in Figure 1. Infrared transmitter is a multivibrator with oscillation frequency being 40kHz, and it is composed of IC2 ( NE555 ), R1, R2 and C3. VLS is the infrared emission probe which can be used to radiate....
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In the event of combustible gas, the conductance of TGS308 gas sensor increases, and the voltage is removed through the potentiometer RP1 slide point, and its value is increased from normal 3V rms to 20V. This elevated voltage is added to transistor VT1....
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This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of low power comparator LM1801 made by National Semiconductor. The reference voltage for the....
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Starting from today I will try to post interesting Arduino projects from around the web. I am novice in this domain but I am giving my best to fully understant it. I must say from the begining that the projects are not developed by me and I will link the....
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Figure shows the bean sprouts automatic watering control circuit. The controller consists of step-down rectifier circuit, power outage told implement (IC3), timing control circuit (IC1), temperature control circuit(IC2) and so on. The step-down rectifier....
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The circuit is shown as the chart. It is a control circuit which composed of infrared specific integrated circuit KC778B and KC778B is the center of the circuit. It s surrounded by a pyroelectric infrared sensor head PIR, light control and light control....
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VFC62 voltage / frequency,frequency / voltage converter can easily convert analog signals into digital signals.The digital output uses the form of open collector,digital pulse repetition rate is proportional to the amplitude of the input analog voltage,the....
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The automatic sprinkler controller circuit is composed of the clock timing controller, monostable flip-flop, bistable flip flop, electronic switch, self-excited multivibrator, counter, solenoid valve control circuit and power supply circuit, and the circuit....
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The automatic sprinkler controller circuit is composed of the +12 V power supply circuit, light control circuit and irrigation control circuit, and the circuit is shown as the Figure. +12 V power supply circuit is composed of the knife switch Q, fuse FU2,....
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The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
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This circuit uses small switching transistors. The maximum motor drive current is limited to about 250mA maximum at 5V. I`ve tested the circuit on voltages from 3V to 21V. With some component changes it should be usefulto 63V in a 36V PV panel system....
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When the switch is on, the seismic alarm isin detection condition. When there is no earthquake, IC1`s pin 3 outputs low level and VT is disconnected. The alarm circuit does not work. When there is an earthquake, the magnet will move vertically. When it is....
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The electric fence control circuit is composed of the power supply circuit, high voltage circuit and sound and light alarm circuit, and it is shown in Figure 4-26. Power supply circuit is composed of the power switch S, the power transformer Tl, bridge....
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Electric fence control circuit is composed of the power supply circuit, pulse generator and high-voltage circuit, and it is shown in Figure 4-27. Power supply circuit is composed of the power transformer Tl, rectifier diodes VDl, VD2, filter capacitors Cl,....
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The electric fence control circuit is composed of the +6 V power supply circuit, high-voltage output circuit, trigger control circuit, alarm circuit and protection circuit, and it is shown in Figure 4-30. +6 V power supply circuit is composed of the power....
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Working Principle: As seen in the figure 4-187, the circuit consists of power circuit, pulse oscillator and high voltage generator. The power circuit consists of S,FU,TI,VD1-VD4,C1,C3,IC1,R1 and VL. The pulse oscillator consists of IC1,R2,R3,RP1 and C2. The....
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The industrial fuel oil furnace controller circuit is composed of the power supply circuit, testing and ignition control circuit and control implementation circuit, and it is shown as the chart. The power supply circuit is composed of the step-down capacitor....
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This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light which is invisible to the human eye. The buzzer at the output of the receiver is activated when the....
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LBl690 is the three-phase brushless DC motor drive control integrated circuit produced by Japanese Sanyo, and it is widely used in domestic and imported broken wind, fresh air-condition brushless DC drive control. 1. FeaturesLBl690 IC has the over-current....
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In the production of LCD projector, the main factors of the threatening life of LCD screen is the temperature of halogen. The multi-function controller made by this circuit is very effective for the protection of liquid crystal projector. The LCD projector....
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After the battery is clipped, because the movement of touch stick will make the light source shine to photosensitive tube, and produce light current, the first level 3DG6 turns on, the emitter outputs signal, the singal is coupled to back level by 10 F....
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Lamp dimmer. The figure below shows the circuit can be used for lamp dimming. It uses a small quantity of components, which can be installed inside the lamp seat. The circuit is commonly used in RC phase shift circuit. W can be adjusted to change the triac....
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Circuit is shown in Figure 1,electrical schematic diagram is shown in Figure 2. The voltage AC220V is reduced by C3,R3 discharges,VD1 and VD2 rectify,C2 and C1 filter and get a smooth direct current,the voltage-regulator diode stabilizes the voltage in 6V....
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Integrated circuit input side has a oscillating circuit,it`s oscillation frequency depends on external components L1, C1 and sensor`s equivalent capacitance, the latter size increases with liquid immersion. Oscillating signal add on the threshold switch....
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Logic power control of analog regulator can be useful in application where a digital circuit/controller need to control power source, such as in EEPROM programmer or other power controls. This is a circuit provide ON-OFF control for 78xx regulator using....
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The medical treat ventilator controller circuit is composed of astable oscillator, control circuit and power supply circuit, it is shown in the figure 9-155. The astable oscillator circuit is made of resistors R1, R2, potentiometer RP, capacitors C1, C2 and....
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The circuit can increase the system power factor ? to the number higher than 0.99, and it can effectively suppress the waveform distortion of the input supply current iin to meet requirements of GB15144 with the distortion index being lower than L level, and....
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The Motion Sensor Switch circuit is a motion sensor controlled automatic water sprinkler but you can easily add an alarm/light function too. Before beginning the construction contact your nearest electronics component vendor and procure a readymade box-type....
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Aboutthe DC motor control problem, This circuit is hoped to help those people who have the actual needs. This circuit`s corotation, rollback, slowing and stopping functions can be controlled by the connected MCU....
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This type of design can produce a very high amperage current for a faction a second that can used to do some useful work if properly harnessed. The switching device could be a rotating spark gap as used by Nikola Tesla or some high speed electronic device,....
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The above picture is the motor control circuit composed of LM339 etc.When the input control signal is high PWL,comparator A and A3 make power amplifier conduct composed of A4,VT5 and VT6 and it drives motor M.At the same time,comparator also outputs and....
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The shown three-phase application circuit owns motor controller circuit connection diagram which is driven by full wave six-step.The power switch triode is Darlington PNP type and the lower power switch triode is N groove power MOSFET. Each device contains a....
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The drive circuit of electromotor includes a FET bridge circuit, FET base drive circuit,current sensor of motor drive circuit and the relay. FET bridge circuit mainly consists of four high-power MOSFET power tubes,it requires that the power tubes have good....
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The electronic motor speed controller circuit consists of wireless remote control transmitter circuit, wireless remote control receiver control circuit, and it is shown as the chart. Wireless remote control transmitter circuit is composed of the micro-power....
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Figure 2-32 (a) shows the time control diagram, and the motor is operated by the switch S1. When Sl is turned to 1, the power driver circuit provides current to the motor for running; When S1 is turned to 2, the drive current is cut off, and the electric....
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The principle of the circuit The motorcycle anti-thief alarm circuit is composed of the detection alarm circuit, the charging circuit and the anti-theft control circuit, this circuit is as shown in figure 7-94. The detection alarm circuit is composed of the....
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The principle of the circuit The motorcycle anti-thief alarm circuit is composed of the anti-theft detection circuit, the control circuit, the sound generator, the audio oscillator and the power amplifier output circuit, the circuit is as shown in figure....
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The PWM control dimming halogen lamp circuit is as shown. Rated voltage of the halogen lamp is 12V, the nominal power is 20W, the dimmer circuit can adjust the intensity of halogen lamp from zero to maximum. Lighting halogen lamp always transforms the....
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A pulse width modulator (PWM) is a device that may be used as an efficient light dimmer or DC motor speed controller. The circuit described here is for a general purpose device that can control DC devices which draw up to a few amps of current. The circuit....
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In this circuit, using a photoelectric coupler can reach 100G? isolation between TTL and relay circuit, it avoids relay noise and peak voltage influencing TTL circuit. When the TTL input singal is high, Q1 turns on, there is no current in LED, and there is....
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Automotive electronic code lock circuit is shown as above. ICl is exclusive lock for the integrated circuit 5G058, its ? ~ ? feet connect external key switch to the power supply. They are six valid input keys. The unlock must follow the sequence of Sl ~ S6;....
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The motor protection circuit is composed of power supply circuit, current detection circuit and protection control circuit, the circuit is shown as the chart. Power circuit is composed of the power transformer T, rectifier diode VD4, filter capacitors C4,....
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Modification of basic speed control circuit for small DC permanent-magnet motors provides maximum current limit under normal conditions and reduced current limit under stall conditions, to limit dissipation of series transistor Q4, to safe value. When motor....
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Pulse telephone 160 168 controller circuit is shown as above, the controller can be installed on the phone or on the switchboard of the trunk. It can effectively prevent the others to freely dail 160, 168. D1 ~ D4 use 1N4004, the rest diode use 1N4008. Q1,....
Light emitted by Xenon flash tube is transmitted to phototransistor MRD300 through optical fiber. Sensitive current is amplified to triggering a string of thyristors simultaneously. Therefore, high voltage of 6000V is set on loader R. This optical trigger....
Low-power two-stage FET transmitter for 80-meter amateur band uses Pierce crystal oscillator that requires no output resonant ci.rcuit. DC milliammeter can be connected across 150-ohm resistor in gate circuit of second transistor to indicate strength of....
This circuit is used in impulse speed modulation system. In this system, transmitter change impulse speed of modulated beam in optical fiber, let it change around 50kHz center frequency. L14G2 optical transistor convert molulated light to radio-frequency....
Complete terminal unit and AFSK tone generator for VHF bands synthesizes tones digitally for 170-Hz narrow shift and 850-Hz standard shift found in VHF amateur RTTY bands. Additional feature is PLL circuit that follows drifting signal and copies signals from....
The 2N2222 circuitry is a three-element, phase-shift oscillator circuit, designed to yield a 1,000-Hz sine wave. The 1,000-Hz sine wave is then applied to the TCG-610 varactor diode, 6 pF at 4 V, which changes the tank capacitance, thus varying the rf....
As shown in figure, D187 is an UART, it`sRX / TX signalconnectedonoptocoupler N21, N22 and N29, so that put the RS-485communication interface receiver / transmitter D28and microprocessor D211 completely optoelectronicisolated. D197 is a generator, the....
The figure shows a simplified schematic diagram of main circuit DMA12. It is mainly composed of input circuit and electromagnetic interference (EMI) filter circuit, impulse current limit circuit, the input rectifier filter circuit, the boost / power factor....
This transmitter uses a 5089 DTMF generator chip and a keypad to generate DTMF signals and modulate them on an IR light beam from an IR LED. Xtal is a 3.579-MHz TV burst crystal....
This schematic for an experimental data transmitter uses optical fibers and a laser diode. Trans-mission frequency of the free-running oscillator is approximately 3 kHz. R5 might have to be varied to suit your laser diode. IC1 is a CD4093....
A schematic diagram of the remote-control receiver is shown. The heart of the circuit is IC1, a PIC16C54 8-bit CMOS manufactured by Microchip. The microcontroller stores its data in IC2, a 93LC46 1-kbit serial EEPROM (electrically erasable programmable....
Related components PDF download: ICL7106CD4036 The LCD electronic thermometer The LCD electronic thermometer circuit is as shown. The temperature sensor KTY10 has good linear relationship between temperature - resistance, and you can connect point A and....
General purpose hobby circuit of a simple light fence security beeper is presented here. This circuit can be used as a door alarm, gate alarm, pathway alarm, etc. Any 12 Volt dc power supply can power the whole circuit.Working of this circuit is straight....
Two IC rf modulators convert a suitable baseband video and audio signal up to a low VHF modulated carrier-Channel 2 through 6 in the U.S., and 1 through 3 in Japan-the LM1889 and the LM2889. Both ICs are identical regarding the rf modulation function,....
This receiver covers 8.5 to 11.5 MHz in two bands and has a sensitivity of under 1 ?V. Nn NE602 mixer feeds a 455-kHz IF amplifier (Q1 and Q2), detector D4, and audio amplifier IC2. Q4 serves as an AGC amplifier coil data is given in the table. The LO is....
Simple FM transmitter with a single transistor. Mini FM transmitters take place as one of the standard circuit types in an amateur electronics fan`s beginning steps. When done right, they provide very clear wireless sound transmission through an ordinary FM....
Integrated circuit U1 (an NE602 double-balanced mixer) is a combination oscillator and frequency mixer. Signals from the antenna input (at J1) are fed through dc-blocking capacitor C1 to the RF-gain control, R1, and fed to the input of U1 at pins 1 and 2.The....
Shown is a schematic of a typical transistor AM radio. This circuit uses npn transistors. The circuit is generic; therefore, no specific values are given for some components. This circuit is for ref-erence, to serve as a starting point for experimenters....
You won`t be disappointed with the performance of this sensitive ultrasonic receiver. It can let you listen to bugs, bats, engines, and virtually any other source of ultrasonic sounds. This circuit uses a piezo tweeter as an ultrasonic microphone, amplifier....
Here is the diagram of radio controlcarreceiverprinciple circuit. Notes:The choice of transistor Q1 and the bias resistorQ1 1815 9018R1 240K 100K The choice of the high-frequency parameters partFrequency C1 C2 L227M 35P 30P 10uH35M 30P 30P 8.2uH40M 30P 20P....
A basic circuit of the transistor UHF radio transmitter with surface acoustic wave resonator (SAW), and the SAW is used as a positive feedback element connected between the transistor VT base and LC network in parallel. Figure (b) shows another basic....
IT usesDTMF encoder output dual tone multi-frequency coded signal to modulate the transmitted carrier frequency. It can form a DTMF encoded radio paging system. The circuit uses DTMF encoding UM97085 and decoding circuit YN9101 circuit to form a small....
The telecontrol receiving decoding circuit`s performance index shown as the chart are as follow: f radio frequency =27MHz, f audio frequency =5.5KHz, 100% modulation - square-wave; f radio frequency=±600Hz, and the frequency shift keying (FSK) is 160Hz, and....
This device adopts encoding and decoding circuit MC145026/ MC145027 and RF transmitter / receiver module TDA1808/ TDA1809, and it can beflexibly operated inthe range of 10~120m, and people have no need to change orginal mouse eterior apperance and inside....
A, B are 2 common contact, outline drawing and pin definition. C is the infrared emission tube shape, pin definition and schematic symbol. CD4069 is the pin definition of inverter pin, and F is the 9013 transistor shape, pin definitions and symbol....
The circuit monitors PC keyboard activity through five-pin DIN connector J1. When the user presses a key, the keyboard sends a series of negative-going pulses on pin 2. In conjunction with Q1 and C3, the op amp essentially functions as an integrator, which....
PCA84C-440/441 is the single-chip microcomputer integrated circuit produced by Philips company, it is widely used in domestic and imported large screen color TV, such as Philips and other color television.1. The internal block circuit diagram and pin....
PIC16C57-RCT is communication single-chip microcomputer integrated circuit, which is widely used in Qiao Xing series of IC card management telephone. 1. Function descriptionPIC16C57-RC integrated circuit includes pulse and dual-tone dialing circuit, memory....
This circuitry is used for the joggle between computer Z RS-23 serial connecting current ring and current ring circuitry, it can transform the voltage semaphore of transmission into the current semaphore with 20 mA, the biggest speed can reach 1200 bits.....
This is a circuit intended to be used in basketball shot clock.Notes:To start in 24 seconds; 24s LOAD SW and Reset SW should be push simultaneously. If not, the count will start in 99. Pulse input can be connected to 555 astable multivibrator but must be....
The 27MHz crystal oscillator circuit is as shown in the figure. The R1, R2, R3 are the biasing resistor, the C6 is the bypass capacitor, the voltage division circuit is composed of the C1, C3, C4 and C2 to control the oscillation strength. The L1 is the....
Each part of LCD has individual counter, latch, decoder and driver. Pumping signal feeds back to the motherboard of LCD. When the display section is disconnected, the phase and amplitude of the motherboard and display segment drive signal are the same. It....
As the figure 15-24 shows, the controller circuit is composed of the switch type Hall integrated circuit DN838 and the astable multivibrator (composed of the 555), this circuit can be used in wide range of applications such as the automatic door opening,....
As the figure 17-1 showns, the camera flash delay circuit can be used to capture the high-speed scene, and you can get a very short exposure time. The light door is composed of the luminous diode and the 3DU type photosensitive tube. When the light is....
This control circuit is composed of the AC step-down rectifier circuit, the astable multivibrator, the timing control circuit, the optocoupler circuit and the SCR driving circuit.etc. As the figure 17-61 shows. The astable multivibrator is composed of the....
As the figure 15-22 shows, the doorbell is composed of the monostable timing circuit, the password switch, the NAND gate circuit and the sound circuit.etc. In the limited time, the circuit uses the program to press the password switch, the doorbell circuit....
This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output held high. When the switch is opened, the timer produces....
Made of SS0001 human pyroelectric voice alarm circuit diagram as shown: Pyroelectric infrared language warning device described in this article can be used to prevent electric shock or theft, after a little modification can also be used for automatic light....
We can use the flash beam to supply the remote control for the AC power devices. The important point of this device is the memory function. It can continuously supply the power to the device. When it acts the second time, the power will be cut off....
The locker alarm circuit or cashbox watcher can be used to protect a cashbox/locker from unauthorised access. This tried and tested design forms a fool-proof,remotely operated alarm/electromagnetic relay driver that receives its control signal from a....
Gates U1-a and U1-b of the 4093 quad 2-tnput NAND Schmitt trigger are connected in variable, low-frequency, square-wave oscillator circuits. The output of gate U1-a is connected to one of the inputs of gate U1-b. The square-wave output of gate U1-a modulates....
This circuit offers open and closed loop contacts (switches 1,2,3) that triggers the alarm ON and stays ON for 5 -10 minutes. The trigering delay (entrance/exit) is 27 seconds. This simple alarm circuit Has also a cancel button for reseting the circuit to....
Human infrared thermal release alarm can receive the heat releasing infrared ray issued by the body during the day or night, then it willgive the sound and light alarm. It is ideal for electronic guard. Working principle: The circuit uses imported IC,....
Infrared burglar alarm circuit schematic is shown in Figure 1. Infrared transmitter is a multivibrator with oscillation frequency being 40kHz, and it is composed of IC2 ( NE555 ), R1, R2 and C3. VLS is the infrared emission probe which can be used to radiate....
In the event of combustible gas, the conductance of TGS308 gas sensor increases, and the voltage is removed through the potentiometer RP1 slide point, and its value is increased from normal 3V rms to 20V. This elevated voltage is added to transistor VT1....
This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of low power comparator LM1801 made by National Semiconductor. The reference voltage for the....
Starting from today I will try to post interesting Arduino projects from around the web. I am novice in this domain but I am giving my best to fully understant it. I must say from the begining that the projects are not developed by me and I will link the....
Figure shows the bean sprouts automatic watering control circuit. The controller consists of step-down rectifier circuit, power outage told implement (IC3), timing control circuit (IC1), temperature control circuit(IC2) and so on. The step-down rectifier....
The circuit is shown as the chart. It is a control circuit which composed of infrared specific integrated circuit KC778B and KC778B is the center of the circuit. It s surrounded by a pyroelectric infrared sensor head PIR, light control and light control....
VFC62 voltage / frequency,frequency / voltage converter can easily convert analog signals into digital signals.The digital output uses the form of open collector,digital pulse repetition rate is proportional to the amplitude of the input analog voltage,the....
The automatic sprinkler controller circuit is composed of the clock timing controller, monostable flip-flop, bistable flip flop, electronic switch, self-excited multivibrator, counter, solenoid valve control circuit and power supply circuit, and the circuit....
The automatic sprinkler controller circuit is composed of the +12 V power supply circuit, light control circuit and irrigation control circuit, and the circuit is shown as the Figure. +12 V power supply circuit is composed of the knife switch Q, fuse FU2,....
The LM1036 is a DC controlled tone (bass/treble), volume and balance circuit for stereo applications in car radio, TV and audio systems. An additional control input allows loudness compensation to be simply effected. Four control inputs provide control of....
This circuit uses small switching transistors. The maximum motor drive current is limited to about 250mA maximum at 5V. I`ve tested the circuit on voltages from 3V to 21V. With some component changes it should be usefulto 63V in a 36V PV panel system....
When the switch is on, the seismic alarm isin detection condition. When there is no earthquake, IC1`s pin 3 outputs low level and VT is disconnected. The alarm circuit does not work. When there is an earthquake, the magnet will move vertically. When it is....
The electric fence control circuit is composed of the power supply circuit, high voltage circuit and sound and light alarm circuit, and it is shown in Figure 4-26. Power supply circuit is composed of the power switch S, the power transformer Tl, bridge....
Electric fence control circuit is composed of the power supply circuit, pulse generator and high-voltage circuit, and it is shown in Figure 4-27. Power supply circuit is composed of the power transformer Tl, rectifier diodes VDl, VD2, filter capacitors Cl,....
The electric fence control circuit is composed of the +6 V power supply circuit, high-voltage output circuit, trigger control circuit, alarm circuit and protection circuit, and it is shown in Figure 4-30. +6 V power supply circuit is composed of the power....
Working Principle: As seen in the figure 4-187, the circuit consists of power circuit, pulse oscillator and high voltage generator. The power circuit consists of S,FU,TI,VD1-VD4,C1,C3,IC1,R1 and VL. The pulse oscillator consists of IC1,R2,R3,RP1 and C2. The....
The industrial fuel oil furnace controller circuit is composed of the power supply circuit, testing and ignition control circuit and control implementation circuit, and it is shown as the chart. The power supply circuit is composed of the step-down capacitor....
This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light which is invisible to the human eye. The buzzer at the output of the receiver is activated when the....
LBl690 is the three-phase brushless DC motor drive control integrated circuit produced by Japanese Sanyo, and it is widely used in domestic and imported broken wind, fresh air-condition brushless DC drive control. 1. FeaturesLBl690 IC has the over-current....
In the production of LCD projector, the main factors of the threatening life of LCD screen is the temperature of halogen. The multi-function controller made by this circuit is very effective for the protection of liquid crystal projector. The LCD projector....
After the battery is clipped, because the movement of touch stick will make the light source shine to photosensitive tube, and produce light current, the first level 3DG6 turns on, the emitter outputs signal, the singal is coupled to back level by 10 F....
Lamp dimmer. The figure below shows the circuit can be used for lamp dimming. It uses a small quantity of components, which can be installed inside the lamp seat. The circuit is commonly used in RC phase shift circuit. W can be adjusted to change the triac....
Circuit is shown in Figure 1,electrical schematic diagram is shown in Figure 2. The voltage AC220V is reduced by C3,R3 discharges,VD1 and VD2 rectify,C2 and C1 filter and get a smooth direct current,the voltage-regulator diode stabilizes the voltage in 6V....
Integrated circuit input side has a oscillating circuit,it`s oscillation frequency depends on external components L1, C1 and sensor`s equivalent capacitance, the latter size increases with liquid immersion. Oscillating signal add on the threshold switch....
Logic power control of analog regulator can be useful in application where a digital circuit/controller need to control power source, such as in EEPROM programmer or other power controls. This is a circuit provide ON-OFF control for 78xx regulator using....
The medical treat ventilator controller circuit is composed of astable oscillator, control circuit and power supply circuit, it is shown in the figure 9-155. The astable oscillator circuit is made of resistors R1, R2, potentiometer RP, capacitors C1, C2 and....
The circuit can increase the system power factor ? to the number higher than 0.99, and it can effectively suppress the waveform distortion of the input supply current iin to meet requirements of GB15144 with the distortion index being lower than L level, and....
The Motion Sensor Switch circuit is a motion sensor controlled automatic water sprinkler but you can easily add an alarm/light function too. Before beginning the construction contact your nearest electronics component vendor and procure a readymade box-type....
Aboutthe DC motor control problem, This circuit is hoped to help those people who have the actual needs. This circuit`s corotation, rollback, slowing and stopping functions can be controlled by the connected MCU....
This type of design can produce a very high amperage current for a faction a second that can used to do some useful work if properly harnessed. The switching device could be a rotating spark gap as used by Nikola Tesla or some high speed electronic device,....
The above picture is the motor control circuit composed of LM339 etc.When the input control signal is high PWL,comparator A and A3 make power amplifier conduct composed of A4,VT5 and VT6 and it drives motor M.At the same time,comparator also outputs and....
The shown three-phase application circuit owns motor controller circuit connection diagram which is driven by full wave six-step.The power switch triode is Darlington PNP type and the lower power switch triode is N groove power MOSFET. Each device contains a....
The drive circuit of electromotor includes a FET bridge circuit, FET base drive circuit,current sensor of motor drive circuit and the relay. FET bridge circuit mainly consists of four high-power MOSFET power tubes,it requires that the power tubes have good....
The electronic motor speed controller circuit consists of wireless remote control transmitter circuit, wireless remote control receiver control circuit, and it is shown as the chart. Wireless remote control transmitter circuit is composed of the micro-power....
Figure 2-32 (a) shows the time control diagram, and the motor is operated by the switch S1. When Sl is turned to 1, the power driver circuit provides current to the motor for running; When S1 is turned to 2, the drive current is cut off, and the electric....
The principle of the circuit The motorcycle anti-thief alarm circuit is composed of the detection alarm circuit, the charging circuit and the anti-theft control circuit, this circuit is as shown in figure 7-94. The detection alarm circuit is composed of the....
The principle of the circuit The motorcycle anti-thief alarm circuit is composed of the anti-theft detection circuit, the control circuit, the sound generator, the audio oscillator and the power amplifier output circuit, the circuit is as shown in figure....
The PWM control dimming halogen lamp circuit is as shown. Rated voltage of the halogen lamp is 12V, the nominal power is 20W, the dimmer circuit can adjust the intensity of halogen lamp from zero to maximum. Lighting halogen lamp always transforms the....
A pulse width modulator (PWM) is a device that may be used as an efficient light dimmer or DC motor speed controller. The circuit described here is for a general purpose device that can control DC devices which draw up to a few amps of current. The circuit....
In this circuit, using a photoelectric coupler can reach 100G? isolation between TTL and relay circuit, it avoids relay noise and peak voltage influencing TTL circuit. When the TTL input singal is high, Q1 turns on, there is no current in LED, and there is....
Automotive electronic code lock circuit is shown as above. ICl is exclusive lock for the integrated circuit 5G058, its ? ~ ? feet connect external key switch to the power supply. They are six valid input keys. The unlock must follow the sequence of Sl ~ S6;....
The motor protection circuit is composed of power supply circuit, current detection circuit and protection control circuit, the circuit is shown as the chart. Power circuit is composed of the power transformer T, rectifier diode VD4, filter capacitors C4,....
Modification of basic speed control circuit for small DC permanent-magnet motors provides maximum current limit under normal conditions and reduced current limit under stall conditions, to limit dissipation of series transistor Q4, to safe value. When motor....
Pulse telephone 160 168 controller circuit is shown as above, the controller can be installed on the phone or on the switchboard of the trunk. It can effectively prevent the others to freely dail 160, 168. D1 ~ D4 use 1N4004, the rest diode use 1N4008. Q1,....
