Popular Circuits Page 152
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An inexpensive electronic thermometer is capable of measuring temperatures over a range of from -30°F to +120°F. A diode-connected 2N3904 transistor used as the temperature sensor forms a voltage divider with Rl. As temperature increases, the voltage drop....
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digital red light jump checking system with RF transmitter. By implementing this project we can trace the red light jumping car with number and the time..
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The nitrogen (N2) laser produces intense extremely short (a few ns) intense (100 kW typical) pulses of light in the near UV portion of the E/M spectrum (337. 1 nm). Despite this impressive capability, the N2 laser is among the easiest to construct for the....
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CDI011 integrated circuits using sound, light control stairs delay switch circuit is relatively simple, Pi can be good. Scarf, and non-f JI and NAND f JlI constitution "and" r J circuit, differential input dynamic. Only two input terminals that is....
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Power this project from sunlight with a CirKits solar power circuit board kit.
Other LED lamp circuits can be seen at FC`s Solar Circuits, another interesting LED project is my 13 Color LED Rainbow. This circuit makes a nice lamp that consumes little power,....
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A complementary transistor pair (Q2 & Q3) is wired as a high efficiency oscillator, directly driving the loudspeaker. Q1 ensures a full charge of C2 when power is applied to the circuit. Pressing on P1, C2 gradually discharges through R8: the circuit starts....
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A preamplifier for magnetic pickups of record players is shown here. The uA 741 is used as an AC coupled non-inverting amplifier operating on a single supply. The amplifier gain is decided by the feedback components in which C2 controls the low frequency....
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Figure 2 is a diagram of the control circuit
built on a 1.45 X 1.8 inch PC board. IC1 is
an LMC555 CMOS timer that generates a
200 microsecond wide clock pulses to step
the motor and control its speed. The speed
can be varied by changing the pulse....
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-
Here we define 7 levels in thereservoir. The sensed values are connected to an encoder circuit. The encoder circuit consist of a 74148 IC, which is a 8 line to 3 line encoder. Next section is the HEX Display` which is a special type of 7 segment display. It....
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A simple transistor amplifier circuit diagram and schematic which can be used as a 12 watts audio transistor amplifier.An op amp IC is used to produce the gain required....
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Headphone type detection circuit according to the figure attached. Figure, 2.2k RMIC-BIAS resistor connected to the audio controller provides a low noise reference voltage (VMIC-REF). When the audio jack is inserted, VMIC-REF voltage through RMIC-BIAS..
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The 555 is wired as an astable and the capacitor is charged only through the 4,7Kohm trimmer (notice the diode) and discharged only through the 2.2 Kohm trimmer, making the duty cycle full adjustable. The square wave is then feed in a totem pole made up of a....
-
Jim took the original EMT 140 design and improved it by using a plate material with a brighter sound, adding modern electronics and higher gain pickups, and providing a substantial discount on the inflated price that plagued the German EMT units. After....
-
-
Ever wanted your home entertainment or sound system to power up itself when plugging in your iPod or other portable MP3 player? Watch this video to s....
-
This rain detector will give you a heads-up the instant it starts to rain, hopefully giving you time to close windows and bring in possessions. The battery-powered circuit draws virtually no current when the sensor is dry and the current consumption is low....
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CS3843 and CS5101 constituted by the output of 5V/3.3V switching DC power supply circuit as shown in FIG. CS3843 is a fixed frequency PWM controller. The IC is characterized by..
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The analog switch multiplexes between channel 1 and channel 2 at the end of each sweep. Controls include Dual Trace/Single Trace mode, sync polarity, sync level, and sync on + or - (rise or falling) edges...
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This ISP Programmer can be used either for in-system programming or as a stand-alone spi programmer for Atmel ISP programmable devices. The programming interface is compatible to STK200 ISP programmer hardware so the users of STK200 can also use the software....
-
-
The circuit diagram shown here is of a Hall Effect switch. Hall Effect sensor IC DN6848 from Panasonic is the heart of the circuit. The DN6848 has a built-in Hall Effect sensor, Schmitt trigger circuit, power supply regulator and temperature compensation....
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As shown in Figure 1 hour using a LM122 timer circuit. Start of the circuit, reset and stop halfway, etc. are converted by the switching operation. Figure, S1 to start timing when the timer is started, then this switch has no effect. S2 is centrally located in..
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The convenience of selecting TV channels using your remote and then pointing the same remote to your Computer so that you can control the whole system using the single remote control. The Following functions can be done with PC Remote control...
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Equipment designed to detect changes associated with fire, monitor the integrity of their operations and provide automatic control, the transmission of information necessary to prepare the facility for fire, temperature, light based on a predetermined....
-
Capacitive proximity sensing has been a very popular topic with our audience over the past year. For your convenience, at the end of this article, there is a hot-linked list of related articles published at Planet Analog. To read Part 1 of this article,....
-
In some places by the reservoir (or well) when the water level constraints to water towers, need to have with ..
-
Available RC coupling between its two stages can also be directly coupled. It is in addition to the common-emitter total radio circuit configuration o road fork a widely used o..
-
The USB standard restricts the current consumption of all USB devices to either 100mA or 500mA depending on the specifics of the USB hub and/or host controller (i. e. computer) that is supplying the power. Ideally, no USB device should ever pull more than....
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Balanced diode mixer circuit is shown. Diode 2AP9 2. Due to the use of two diodes and the voltage is large, the diode operates in the off state, it is also known diode switch tube balanced mixer...
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In FSK, two discrete frequencies are used to represent the binary digits 0 and 1. The heart of the circuit consists of two Wien-bridge oscillators built using a dual op amp LM 1458, for the two frequencies. The two frequencies are enabled corresponding to....
-
This up/down timer was designed to control a power antenna on a late-model vehicle. Normally, this vehicle uses a body computer to control the antenna. However, the person who owned the vehicle wanted to install his own high-powered audio stereo system. The....
-
-
Also called the parallel A/D converter, this circuit is the simplest to understand. It is formed of a series of comparators, each one comparing the....
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This circuit is much more modest, but certainly still worth the effort. It provides a high quality interior light delay. This is a feature that is included as standard with most modern cars, although the version with an automatic dimmer is generally only....
-
A delay using his electric lamp circuit. Normally, product thyristor VTH off iLi light E does not light, turn on the lights when needed, according to FSH, VT1, VTZ group into c..
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In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A 6.2K, 5 watt resistor and zener diode is used to drop the voltage to 12 volts DC for the circuit....
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See as the figure, the controller consists of liquid level, trigger controller and step-down rectifier circuit, etc. The water level detecting poles of a, b and c compose the bias circuit as the water level detector with W1, R1, R2 and R3. When the water....
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Another solution would be to improve the current feedback signal to an error amplifier summing junction incorporated into, a current feedback loop to increase. Figure this scen..
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Bong circuit is a high frequency Colpitts circuit l shake Ge coil L, there are two f head, simple production, by determining the frequency of oscillation and tested to determin..
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-
-
There are several RS232 transceiver circuit used for commond communicated between microcontroller and other devices such as PCs or devices rs232. Here is a collection of RS232 transceiver circuits that use well-known for today. The circuit using MAX232,....
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This temperature controller has a range of -50 to +150°C and permits defrosting. R7, VR3, and R8 ..
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12V car battery is recomended to be used as the input, transistor 2N3055 is used as the amplifier. It will deliver the power output up to 100W and you can use this inverter for battery charger, emergency light and other electronic appliances...
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Four 595s together to drive 7-segment displays and alsoadded code to acceptinput from the PC. Instead of using 10-LED bar graphs like I did last time, I`ve moved on to 7-segment displays - which are more challenging and provide a more meaningful output. The....
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Specific remote control transmitter circuit composition shown in a diagram. Transmitter mainly by the large scale integrated circuit chip Dl (THBT- T01), 4s5kHz crystal oscillator, 32kHz crystal oscillator, a liquid crystal display (LCD), room temperature....
-
100W full-wave single-junction transistor trigger doer control circuit It is suitable for constant or variable speed wire feed control wire feed motor. The input control signal..
-
As shown in Figure by the built-in temperature sensor to control the triac TC620 achieve temperature control. Adjustment circuit Rp1 and Rn ..
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Sensors for lighting controls are either photoelectric sensing or presence detectors. Photoelectric sensors are normally set to switch lighting on at dusk and off at dawn. Adjustments can be made to change response to higher or lower levels. Built-in time....
-
System Oscillator Crystal/Ceramic Oscillator. The following circuit combination of resistors, capacitors and inductors depicts an equivalent cir- cuit for a crystal or ceramic Oscillator ..
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The CXA1600M CXA1600P is an 8-pin single-chip bipolar IC for AM Radios This IC includes all functions from the front-end to the power Amplifier The CXA1600M CXA1600P doesnt require any external Filter making external ceramic Filter attachment unnecessary. By....
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This amplifier circuit based on IC TDA2612 produced by siemens, minimum voltage require for this circuit is 10 Volts and amximum voltage require 35 volts DC. Power output 25 watt with 4 ohm impedance. Frequncy response 20Hz to 20kHz. Quiescent current is 70....
-
This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Used as a sound effect generator it can be connected to external amplifiers, tape....
-
As far as we are concerned we are looking for a function generator or a VCO (voltage-controlled oscillator). We would love to know which specific component we need. EDIT: What we are actually trying to achieve is to make two sine sound waves. One is constant....
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Hi all I made this circuit to be a light dimmer but it did not work. I use BT136 for the SCR and MOC3022 for optocoupler. Can you tell me what is the....
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The Model HC 6 Headphone Console is a six channel headphone amplifier, consisting of six stereo amplifiers, two master stereo inputs and six individual stereo inputs. The two master stereo inputs feed a separate left and right bus to each of the six....
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The diode rectifies the ringing signal to supply the operating power to the audio relaxation oscillator made up of LI, L2, Rl, R2, and C. Moreover, L2 together with Ql acts as an opto-isolator, totally isolating the telephone line from the rest of the....
-
This circuit works REALLY well. Notice how it will fire even in complete silence. This provides a sort of automatic gain control...
-
Ail ultrasonic cleaner is useful to clean certain items. This circuit uses a microcontroller to control timing and give a digital readout, but only the basic oscillator can be used, if desired. RESL, RES2 are piezoelectric transducers driven by power....
-
If you need a negative supply for op-amp or just need negative bias voltage while operating from a single supply voltage (for battery operation for example),...
-
-
This circuit is design of the counter timer that using countdown calculation. This circuit is using 555 IC as main control. 555 IC is a counter IC and a transistor switch to activate a relay either ON/OFF (mode selected by a jumper) as soon as the counting....
-
This circuit uses a UM3561 IC to produce four different sound effects. Nothing too complicated here. The IC produces all the sound effects, the output at Pin 3 being amplified by the transistor. A 64 ohm loudspeaker can be substituted in place of the 56 ohm....
-
A lot of electronic circuits using NE555 timer IC are already published here and this is just another one. Here is the circuit diagram of a police siren based on NE55 timer IC. The circuit uses two NE555 timers ICs and each of them are wired as astable....
-
Incandescent lamp has been used to reduce harmonic distortion in sine oscillator circuit. The nonlinear resistance characteristic of the lamp filament help the circuit to shape the signal to approximate the ideal sine wave. Here is the classic Wien-bridge....
-
The first step to building a RFID door lock with a basic Arduino is to bread board out a basic working arduino. Most Arduino pre-flashed ATMega 168 chips come with the default blink program pre installed. Connect a LED to digital output 13 and verify that....
-
Figure shows the Colpitts oscillator circuit. It has a base frequency crystal, and the frequency is 1499 kHz, crystal SJT is connected to the both ends of capacitor C2, C3. Emitter divider resistor R2, R3 provide basic feedback signal, the feedback voltage....
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Getting the right amplifier loop gain is the major problem in producing a low distortion constant amplitude sine wave. However, we can solve this problem with....
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This deceptively simple sequencer actually pulse width modulates the LEDs as it fades from one LED to the next. Bulbs will last much longer when driven in this gentle manner. Add MOSFETs or transistors to the outputs if you wish to drive bulbs. You can....
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This is a simple microphone preamplifier circuit which you can use between your dynamic microphone and any equipment designed to work with an electret microhone (2 wire connection to electret capsule). This amplifier amplifies the low level signal to the....
-
Where it really shines is in the univibe. The 'vibe uses a dual section, reverse log taper pot that's just a bit easier to find than a dinosaur's tooth. If we notice that the pot is really wired as two variable resistors, we can use an LED/dual LDR module....
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This circuit performs the function of dividing the input signal by a selected constant (1, 2, 4, 8, etc.). While T, Z, or L sections could be used in the input attenuator, this is not necessary since the amplifier loading is negligible and a constant input....
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In this tutorials we are going to tackle out how dos the memory card circuit works on mobile phones. As in my previous post I talked about memory card pin-outs and types of memory cards used on cellular phones. Okay, the block diagram below shows how the....
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A simple way to build a battery-powered RS-232 receiver circuit is shown on the following schematic diagram. This circuit convert RS232 level to TTL level....
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The design is simple, tuneable, but no longer terribly useful (I include it here just for purposes of education and folks` historical interest). This design has a number of weaknesses; courtesy of Wilf Rigter, here are a few:..
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A VU (Volume Unit) meters used to be the mainstay of audio metering system. The Peak Program Meter (PPM) is notoriously bad at showing the peak signal level. This is a circuit that have function same of the explanation in above. In this circuit, the....
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Mark IIc+ has a reputation of being one of the most sought after amps today. Only 1500 of them were made back in the 80 ²s and these days they go for up to 4000-5000$ a piece. One of the players that made this amp famous is John Petrucci. Being a Petrucci....
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Hi there. I`ve building a 430Mhz Transmitter for microwave. And for some strange reason i couldn`t get any output frequency from my circuit. I`ve....
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The microampere meter The microampere meter gives full scale deflection for 0.1 V input. The current to be measured is passed through a known....
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This photoelectric smoke detector circuit uses one LED and 2 LDRs to detect the smoke and sound an alarm. The LM1801 IC is the best choice for this circuit....
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An Astable Multivibrator or a Free Running Multivibrator is the multivibrator which has no stable states. Its output oscillates continuously between its two unstable states without the aid of external triggering. The time period of each states are determined....
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This is a switch selectable dual output "re-hashed" version of my previous (2007) design, and uses a field programmed EPROM for generating both versions of the ringing sequence. AC mains is stepped down to about 10 v AC and fed to the familiar bridge....
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A full range power controller suitable for lamp dimming and similar applications operate from a 120 volt, 60 Hz ac source, and can control up to 1000 watts of power to incandescent bulbs. The power to the bulbs is varied by controlling the conduction angle....
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A simple transformerless power supply circuit with diagram and schematics that gives 5 volts dc output.This is a low cost,low current power supply circuit suitable for simple applications like power an LED....
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The modulator and oscillator consist of two NPN transistors. The base of the modulator transistor is driven by a bidirectional current source with the voltage range for the high condition limited by a saturating PNP collector to the pin 4 Vreg voltage and....
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This 70MHz rf power amplifier circuit uses the SD1143 transistor which provides a gain of about 14dB in this design. It uses the fact that a 175MHz device....
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CO2 gas shielded arc welding power supply electromagnetic vibration circuit C02 gas shielded arc welding electromagnetic vibration, vibration welding abbreviation commonly used..
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This is an image Schematic. No Description available...
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Circuit shown in Figure 3-14. SA switch placed in the work position, the motor is transferred; SA placed bit is set, reverse the motor. Drawing, over-voltage protection element..
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The NJM2574 is a Low Voltage Video Amplifier contained LPF circuit75 driver and internal CLAMP/BIAS SWLPF/through SW to connect TV monitor directly. The input composite signal. (0. 5Vpp) The mute circuit with power save function is suitable for low power....
An inexpensive electronic thermometer is capable of measuring temperatures over a range of from -30°F to +120°F. A diode-connected 2N3904 transistor used as the temperature sensor forms a voltage divider with Rl. As temperature increases, the voltage drop....
digital red light jump checking system with RF transmitter. By implementing this project we can trace the red light jumping car with number and the time..
The nitrogen (N2) laser produces intense extremely short (a few ns) intense (100 kW typical) pulses of light in the near UV portion of the E/M spectrum (337. 1 nm). Despite this impressive capability, the N2 laser is among the easiest to construct for the....
CDI011 integrated circuits using sound, light control stairs delay switch circuit is relatively simple, Pi can be good. Scarf, and non-f JI and NAND f JlI constitution "and" r J circuit, differential input dynamic. Only two input terminals that is....
Power this project from sunlight with a CirKits solar power circuit board kit. Other LED lamp circuits can be seen at FC`s Solar Circuits, another interesting LED project is my 13 Color LED Rainbow. This circuit makes a nice lamp that consumes little power,....
A complementary transistor pair (Q2 & Q3) is wired as a high efficiency oscillator, directly driving the loudspeaker. Q1 ensures a full charge of C2 when power is applied to the circuit. Pressing on P1, C2 gradually discharges through R8: the circuit starts....
A preamplifier for magnetic pickups of record players is shown here. The uA 741 is used as an AC coupled non-inverting amplifier operating on a single supply. The amplifier gain is decided by the feedback components in which C2 controls the low frequency....
Figure 2 is a diagram of the control circuit built on a 1.45 X 1.8 inch PC board. IC1 is an LMC555 CMOS timer that generates a 200 microsecond wide clock pulses to step the motor and control its speed. The speed can be varied by changing the pulse....
Here we define 7 levels in thereservoir. The sensed values are connected to an encoder circuit. The encoder circuit consist of a 74148 IC, which is a 8 line to 3 line encoder. Next section is the HEX Display` which is a special type of 7 segment display. It....
A simple transistor amplifier circuit diagram and schematic which can be used as a 12 watts audio transistor amplifier.An op amp IC is used to produce the gain required....
Headphone type detection circuit according to the figure attached. Figure, 2.2k RMIC-BIAS resistor connected to the audio controller provides a low noise reference voltage (VMIC-REF). When the audio jack is inserted, VMIC-REF voltage through RMIC-BIAS..
The 555 is wired as an astable and the capacitor is charged only through the 4,7Kohm trimmer (notice the diode) and discharged only through the 2.2 Kohm trimmer, making the duty cycle full adjustable. The square wave is then feed in a totem pole made up of a....
Jim took the original EMT 140 design and improved it by using a plate material with a brighter sound, adding modern electronics and higher gain pickups, and providing a substantial discount on the inflated price that plagued the German EMT units. After....
Ever wanted your home entertainment or sound system to power up itself when plugging in your iPod or other portable MP3 player? Watch this video to s....
This rain detector will give you a heads-up the instant it starts to rain, hopefully giving you time to close windows and bring in possessions. The battery-powered circuit draws virtually no current when the sensor is dry and the current consumption is low....
CS3843 and CS5101 constituted by the output of 5V/3.3V switching DC power supply circuit as shown in FIG. CS3843 is a fixed frequency PWM controller. The IC is characterized by..
The analog switch multiplexes between channel 1 and channel 2 at the end of each sweep. Controls include Dual Trace/Single Trace mode, sync polarity, sync level, and sync on + or - (rise or falling) edges...
This ISP Programmer can be used either for in-system programming or as a stand-alone spi programmer for Atmel ISP programmable devices. The programming interface is compatible to STK200 ISP programmer hardware so the users of STK200 can also use the software....
The circuit diagram shown here is of a Hall Effect switch. Hall Effect sensor IC DN6848 from Panasonic is the heart of the circuit. The DN6848 has a built-in Hall Effect sensor, Schmitt trigger circuit, power supply regulator and temperature compensation....
As shown in Figure 1 hour using a LM122 timer circuit. Start of the circuit, reset and stop halfway, etc. are converted by the switching operation. Figure, S1 to start timing when the timer is started, then this switch has no effect. S2 is centrally located in..
The convenience of selecting TV channels using your remote and then pointing the same remote to your Computer so that you can control the whole system using the single remote control. The Following functions can be done with PC Remote control...
Equipment designed to detect changes associated with fire, monitor the integrity of their operations and provide automatic control, the transmission of information necessary to prepare the facility for fire, temperature, light based on a predetermined....
Capacitive proximity sensing has been a very popular topic with our audience over the past year. For your convenience, at the end of this article, there is a hot-linked list of related articles published at Planet Analog. To read Part 1 of this article,....
In some places by the reservoir (or well) when the water level constraints to water towers, need to have with ..
Available RC coupling between its two stages can also be directly coupled. It is in addition to the common-emitter total radio circuit configuration o road fork a widely used o..
The USB standard restricts the current consumption of all USB devices to either 100mA or 500mA depending on the specifics of the USB hub and/or host controller (i. e. computer) that is supplying the power. Ideally, no USB device should ever pull more than....
Balanced diode mixer circuit is shown. Diode 2AP9 2. Due to the use of two diodes and the voltage is large, the diode operates in the off state, it is also known diode switch tube balanced mixer...
In FSK, two discrete frequencies are used to represent the binary digits 0 and 1. The heart of the circuit consists of two Wien-bridge oscillators built using a dual op amp LM 1458, for the two frequencies. The two frequencies are enabled corresponding to....
This up/down timer was designed to control a power antenna on a late-model vehicle. Normally, this vehicle uses a body computer to control the antenna. However, the person who owned the vehicle wanted to install his own high-powered audio stereo system. The....
Also called the parallel A/D converter, this circuit is the simplest to understand. It is formed of a series of comparators, each one comparing the....
This circuit is much more modest, but certainly still worth the effort. It provides a high quality interior light delay. This is a feature that is included as standard with most modern cars, although the version with an automatic dimmer is generally only....
A delay using his electric lamp circuit. Normally, product thyristor VTH off iLi light E does not light, turn on the lights when needed, according to FSH, VT1, VTZ group into c..
In this circuit, a 120VAC lamp is slowly illuminated over a approximate 20 minute period. The bridge rectifier supplies 120 DC to the MOSFET and 60 watt lamp. A 6.2K, 5 watt resistor and zener diode is used to drop the voltage to 12 volts DC for the circuit....
See as the figure, the controller consists of liquid level, trigger controller and step-down rectifier circuit, etc. The water level detecting poles of a, b and c compose the bias circuit as the water level detector with W1, R1, R2 and R3. When the water....
Another solution would be to improve the current feedback signal to an error amplifier summing junction incorporated into, a current feedback loop to increase. Figure this scen..
Bong circuit is a high frequency Colpitts circuit l shake Ge coil L, there are two f head, simple production, by determining the frequency of oscillation and tested to determin..
There are several RS232 transceiver circuit used for commond communicated between microcontroller and other devices such as PCs or devices rs232. Here is a collection of RS232 transceiver circuits that use well-known for today. The circuit using MAX232,....
This temperature controller has a range of -50 to +150°C and permits defrosting. R7, VR3, and R8 ..
12V car battery is recomended to be used as the input, transistor 2N3055 is used as the amplifier. It will deliver the power output up to 100W and you can use this inverter for battery charger, emergency light and other electronic appliances...
Four 595s together to drive 7-segment displays and alsoadded code to acceptinput from the PC. Instead of using 10-LED bar graphs like I did last time, I`ve moved on to 7-segment displays - which are more challenging and provide a more meaningful output. The....
Specific remote control transmitter circuit composition shown in a diagram. Transmitter mainly by the large scale integrated circuit chip Dl (THBT- T01), 4s5kHz crystal oscillator, 32kHz crystal oscillator, a liquid crystal display (LCD), room temperature....
100W full-wave single-junction transistor trigger doer control circuit It is suitable for constant or variable speed wire feed control wire feed motor. The input control signal..
As shown in Figure by the built-in temperature sensor to control the triac TC620 achieve temperature control. Adjustment circuit Rp1 and Rn ..
Sensors for lighting controls are either photoelectric sensing or presence detectors. Photoelectric sensors are normally set to switch lighting on at dusk and off at dawn. Adjustments can be made to change response to higher or lower levels. Built-in time....
System Oscillator Crystal/Ceramic Oscillator. The following circuit combination of resistors, capacitors and inductors depicts an equivalent cir- cuit for a crystal or ceramic Oscillator ..
The CXA1600M CXA1600P is an 8-pin single-chip bipolar IC for AM Radios This IC includes all functions from the front-end to the power Amplifier The CXA1600M CXA1600P doesnt require any external Filter making external ceramic Filter attachment unnecessary. By....
This amplifier circuit based on IC TDA2612 produced by siemens, minimum voltage require for this circuit is 10 Volts and amximum voltage require 35 volts DC. Power output 25 watt with 4 ohm impedance. Frequncy response 20Hz to 20kHz. Quiescent current is 70....
This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Used as a sound effect generator it can be connected to external amplifiers, tape....
As far as we are concerned we are looking for a function generator or a VCO (voltage-controlled oscillator). We would love to know which specific component we need. EDIT: What we are actually trying to achieve is to make two sine sound waves. One is constant....
Hi all I made this circuit to be a light dimmer but it did not work. I use BT136 for the SCR and MOC3022 for optocoupler. Can you tell me what is the....
The Model HC 6 Headphone Console is a six channel headphone amplifier, consisting of six stereo amplifiers, two master stereo inputs and six individual stereo inputs. The two master stereo inputs feed a separate left and right bus to each of the six....
The diode rectifies the ringing signal to supply the operating power to the audio relaxation oscillator made up of LI, L2, Rl, R2, and C. Moreover, L2 together with Ql acts as an opto-isolator, totally isolating the telephone line from the rest of the....
This circuit works REALLY well. Notice how it will fire even in complete silence. This provides a sort of automatic gain control...
Ail ultrasonic cleaner is useful to clean certain items. This circuit uses a microcontroller to control timing and give a digital readout, but only the basic oscillator can be used, if desired. RESL, RES2 are piezoelectric transducers driven by power....
If you need a negative supply for op-amp or just need negative bias voltage while operating from a single supply voltage (for battery operation for example),...
This circuit is design of the counter timer that using countdown calculation. This circuit is using 555 IC as main control. 555 IC is a counter IC and a transistor switch to activate a relay either ON/OFF (mode selected by a jumper) as soon as the counting....
This circuit uses a UM3561 IC to produce four different sound effects. Nothing too complicated here. The IC produces all the sound effects, the output at Pin 3 being amplified by the transistor. A 64 ohm loudspeaker can be substituted in place of the 56 ohm....
A lot of electronic circuits using NE555 timer IC are already published here and this is just another one. Here is the circuit diagram of a police siren based on NE55 timer IC. The circuit uses two NE555 timers ICs and each of them are wired as astable....
Incandescent lamp has been used to reduce harmonic distortion in sine oscillator circuit. The nonlinear resistance characteristic of the lamp filament help the circuit to shape the signal to approximate the ideal sine wave. Here is the classic Wien-bridge....
The first step to building a RFID door lock with a basic Arduino is to bread board out a basic working arduino. Most Arduino pre-flashed ATMega 168 chips come with the default blink program pre installed. Connect a LED to digital output 13 and verify that....
Figure shows the Colpitts oscillator circuit. It has a base frequency crystal, and the frequency is 1499 kHz, crystal SJT is connected to the both ends of capacitor C2, C3. Emitter divider resistor R2, R3 provide basic feedback signal, the feedback voltage....
Getting the right amplifier loop gain is the major problem in producing a low distortion constant amplitude sine wave. However, we can solve this problem with....
This deceptively simple sequencer actually pulse width modulates the LEDs as it fades from one LED to the next. Bulbs will last much longer when driven in this gentle manner. Add MOSFETs or transistors to the outputs if you wish to drive bulbs. You can....
This is a simple microphone preamplifier circuit which you can use between your dynamic microphone and any equipment designed to work with an electret microhone (2 wire connection to electret capsule). This amplifier amplifies the low level signal to the....
Where it really shines is in the univibe. The 'vibe uses a dual section, reverse log taper pot that's just a bit easier to find than a dinosaur's tooth. If we notice that the pot is really wired as two variable resistors, we can use an LED/dual LDR module....
This circuit performs the function of dividing the input signal by a selected constant (1, 2, 4, 8, etc.). While T, Z, or L sections could be used in the input attenuator, this is not necessary since the amplifier loading is negligible and a constant input....
In this tutorials we are going to tackle out how dos the memory card circuit works on mobile phones. As in my previous post I talked about memory card pin-outs and types of memory cards used on cellular phones. Okay, the block diagram below shows how the....
A simple way to build a battery-powered RS-232 receiver circuit is shown on the following schematic diagram. This circuit convert RS232 level to TTL level....
The design is simple, tuneable, but no longer terribly useful (I include it here just for purposes of education and folks` historical interest). This design has a number of weaknesses; courtesy of Wilf Rigter, here are a few:..
A VU (Volume Unit) meters used to be the mainstay of audio metering system. The Peak Program Meter (PPM) is notoriously bad at showing the peak signal level. This is a circuit that have function same of the explanation in above. In this circuit, the....
Mark IIc+ has a reputation of being one of the most sought after amps today. Only 1500 of them were made back in the 80 ²s and these days they go for up to 4000-5000$ a piece. One of the players that made this amp famous is John Petrucci. Being a Petrucci....
Hi there. I`ve building a 430Mhz Transmitter for microwave. And for some strange reason i couldn`t get any output frequency from my circuit. I`ve....
The microampere meter The microampere meter gives full scale deflection for 0.1 V input. The current to be measured is passed through a known....
This photoelectric smoke detector circuit uses one LED and 2 LDRs to detect the smoke and sound an alarm. The LM1801 IC is the best choice for this circuit....
An Astable Multivibrator or a Free Running Multivibrator is the multivibrator which has no stable states. Its output oscillates continuously between its two unstable states without the aid of external triggering. The time period of each states are determined....
This is a switch selectable dual output "re-hashed" version of my previous (2007) design, and uses a field programmed EPROM for generating both versions of the ringing sequence. AC mains is stepped down to about 10 v AC and fed to the familiar bridge....
A full range power controller suitable for lamp dimming and similar applications operate from a 120 volt, 60 Hz ac source, and can control up to 1000 watts of power to incandescent bulbs. The power to the bulbs is varied by controlling the conduction angle....
A simple transformerless power supply circuit with diagram and schematics that gives 5 volts dc output.This is a low cost,low current power supply circuit suitable for simple applications like power an LED....
The modulator and oscillator consist of two NPN transistors. The base of the modulator transistor is driven by a bidirectional current source with the voltage range for the high condition limited by a saturating PNP collector to the pin 4 Vreg voltage and....
This 70MHz rf power amplifier circuit uses the SD1143 transistor which provides a gain of about 14dB in this design. It uses the fact that a 175MHz device....
CO2 gas shielded arc welding power supply electromagnetic vibration circuit C02 gas shielded arc welding electromagnetic vibration, vibration welding abbreviation commonly used..
Circuit shown in Figure 3-14. SA switch placed in the work position, the motor is transferred; SA placed bit is set, reverse the motor. Drawing, over-voltage protection element..
The NJM2574 is a Low Voltage Video Amplifier contained LPF circuit75 driver and internal CLAMP/BIAS SWLPF/through SW to connect TV monitor directly. The input composite signal. (0. 5Vpp) The mute circuit with power save function is suitable for low power....
