Popular Circuits Page 153
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In practical cases a series resistance has always to be inserted, having it the double purpose of limiting the current at pin 7 and to smooth down the stand-by ON/OFF ..
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General connection method of fluorescent lamp Fluorescent lamps used in homes and public places lighting and so on, with luminous efficiency, long service life, Figure 20 is the general wiring diagram for lamp. Fluorescent working principle: When the switch....
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The LTC1063 is the first monolithic low-pass filter that simultaneously offers outstanding dc and ac performance. It features internal or external clock tunability, cutoff frequencies up to 50 kHz, 1-mV typical output dc offset, and a dynamic range in....
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Operating a stepper motor using a fixed (constant) voltage supply results in poor torque at high speeds. In fact, stepper motors tend to stall at fairly low speeds under such conditions. Several approaches can be used to overcome this problem, one of which....
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This circuit is next experiment to build high quality DAC with optical input TOSLINK, electrical input S/PDIF and USB input. Both electrical inputs are galvanic separated from DAC. This circuit was thought like part of preamplifier / headphone amplifier with....
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Using this circuit diagram, can be designed a very simple AC voltage converter, which converts the 240V AC power to a voltage of 110V. Circuit can be successfully used to power electrical devices that require a supply voltage of 110V. If su....
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Circuit shown in Figure 3-83. The figure shows that only when the contactor KMi after pull (ie, after the motor Mi first start), KM2 to pull (ie Mz after start) ..
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Does anyone know what circuit i can use to make a dc motor randomly move backward and forward, stop for a period of time and then start again Any help and ideas will be much apreciated. Google and read about how to wire up PICs. In the simplest sense, it....
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The circuit in Figure 1 comprises IC1, a Microchip PIC12F675 microcontroller driving IC2, a Kingbright AAF5060PBESEEVG "rainbow" indicator that contains three ultrabright LED chips (red, green, and blue) within one package. Modulating each LED`s duty cycle....
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A frequency reference for tuning up the RS-232 to 100 MHz RF desktop channel adapter elsewhere on this site, when I found this Saronix crystal oscillator in my junk box. A few minutes with AVRStudio produced an ATtiny12 to make a tone - even fewer parts....
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As demand for VRM output current being bigger and bigger, the components and parts of SR-Buck converter can not already meet the demand for the microprocessor 100 A of new generation; In addition, the filtering inductance of making the heavy current is very....
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An DIY RF decibel (or power) meter is an indispensable instrument in any radio workshop. Unfortunately, accurate, wideband models are fairly expensive, and....
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This circuit is a missing pulse detector. It is used in the_ General Purpose Controller Board with Basic Stamp 1. This circuit is used to monitor an input pulse train, and when a pulse is missed the 555 timer output will switch low. For the General Purpose....
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In hybrid system, analog system with digital control, a voltage controlled things is very important since it can be interfaced by DAC from digital system. For....
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This circuit consists of a single transistor as amplifier and it gives a nice amplification to weakest and unipolar signals for feeding to a real amplifier. Don`t post your email or phone number in the comment box. Only put email address in the email field.....
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Circuit works: Figure shows a dedicated stepping motor controller L297 key pin, 17 feet (cw / ccw) is used to control the stepper motor rotation direction..
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A two transistor circuit that flashes two LEDs on and off alternately. This tutorial shows beginners in electronics how to build the easy circuit on breadboard....
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Here is a very useful project of an automatic street light or lamp circuit which can be used to activate your outdoor lights like garden lamps, night lights etc. automatically when the sun set and turn off automatically when the sun rises. The circuit is....
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This is one of the simplest stereo balance indicator circuit that you can have. The circuit will give a visual indication (using two LEDs) proportional to the difference in balance between the left and right channels of a stereo system. The circuit is based....
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Originally Posted by kalena555 Dear Mark, The bit of info of getting the motor to run without the tubes is new info to me. So much learn XD. Well now....
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This circuit enables observation of movement between other stroboscopes. Generation of rectangular signal is based on NE555. This circuit requires a low power supply that is made from a simple transformer TR1, traditional rectifier bridge and zener diode.....
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The idea behind this project is to provide some means of loading a program into a PIC that will then be able to program other PICs in a more conventional way. How do you program a PIC to be a programming device without a programmer, and why would you want to....
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A common LED driver requirements are: The LED string voltage and the input voltage is very wide and overlapping. In fact, some designers prefer to use with a LED driver circuit..
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The circuit can measure the frequency between 1. 5kHz ~ 500kHz by connecting C1 ~ C6 different capacitors. The maximum frequency is up to 1MHz. Transistor T1 can be used as the integrator, and its load resistor is 15k © resistor and R1 ~~ R6 adjustable....
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tutorials reviews software airsoft Introduction This project illustrates how to connect a PC to a small FRS radio via a simple RS-232 interface. There are several reasons that you may want to....
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Initially I chose another infrared sensor for test, PIR Motion Sensor, which was to detect any motion in front of the sensor but it turened out not so sensitive. So that I looked at this QRD1114 IR Sensor for substitute. In this test, I used both as digital....
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If the TV receiver in question does not have a video input and its owner is reluctant to vandalise it in order to fit one then this sort of modulator is the obvious solution. It is a simple circuit that processesvideo signals to enable them to be fed....
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Above diagram is the circuit of Lithium-ion (Li-ion) battery charger which built based single chip MAX1879. This is the simple and low cost battery charger for single-cell Li+ battery that does not dissipate power (no heat. The MAX1879, in conjunction with....
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Apex seems i begin to love this amp the corrected clear schematic is this with different R14 values(tried 22k,30k,56k) and different supply....
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This area shows the construction and testing of a medium to large class Tesla coil. In this section, the previous coils were dismantled and a new larger coil, with a secondary over 6 inches, was redesigned and constructed for maximum efficiency at a power if....
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This simple window detector uses only half of a 7400 quad NAND gate plus four resistors, chosen so that the voltage at point A exc.,eds the voltage at point B for any input voltage. With no input applied or when VIN is at ground, the output of gate Gl is....
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ArduinoISP Bootloader/Programmer Combination Shield (not shown) & Arduino with USB to serial chip (e. g. Arduino Uno ) to upload the bootloader and sketches to DIYduino. You can also use a USBtoSerial programmer for uploading a sketch and work around the....
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The telephone-line decibel meter and line-voltage sensor shown lets you accurately monitor and adjust telephone sound levels. The 600-0 resistor properly terminates the line. ..
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This is a simple LED blinking project using PIC16F877A. Basically there are only 2 LEDs, connected to PIC16F877A and the source code is being modified from the 16F template....
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The PCB is at the center of any electronic product. Literally, the enclosure surrounds the board, and figuratively, all the mathematics, the science, the software, these all run on the board. That’s why the PCB is at the center of our tools, and our company.....
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The LA1600 being an AM Tuner IC placed in a 9-pin SIP, provides the functions of an AM Tuner It is usable in the band range up to SW band and is especially suited for use in low-cost AM Radios and radio-controlled receivers. By Sanyo Semiconductor Corporation ..
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This be mini size power amplifier 2 watt OTL that use IC LM380. Be base readymade circuit for side sound work and the communication. Which use outside equipment adds least. The C6 can choose get many the value since 47uF to at 470uF which, have a voice good....
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The Electronic Dazer is a modern, portable, personal-protection appliance. It generates hight potential energy to ward off vicious animals or other attackers. It is an aid to help exape from a potentially dangerous situation. the device develops about 2,000....
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The LTC ®6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz. It can be used as a fixed-frequency or voltage-controlled oscillator (VCO). The LTC6990 is part of the TimerBlox ® family of versatile silicon timing....
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The amplifier`s gain is nominally 20 dB. Its frequency response is determined primarily by the value of just a few components-primarily C1 and R1. The values of the schematic diagram provide a response of ±3. 0 dB from about 120 Hz to better than 20, 000 Hz.....
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The major building blocks for a white-LED driver are an oscillator, a charge pump, and a regulated current source. National Semiconductor (www.national.com) produces a device that contains all these building blocks in the highly integrated LM2791/2 IC. You....
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The CD4069 or 74C04 hex inverter—is used as^ fixed-frequency oscillator centered around 100 kHz. U2 contains the variable frequency oscillator and balanced modulator. The CD4046 is a phase-locked loop and R3, R4, and C2 determine the center frequency of....
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Used buba oscillator and it didn`t oscillate in the begining. first thing you should check the basics. a little error in cap, res and inductor values makes a huge difference. try calculating the component values with multimeter and i bet cap value wont be....
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This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent....
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Want a regulated voltage that can be adjusted to suit your application? This Adjustable Power Supply is small, easy to build and can be adapted to produce....
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The PowerSaver Flasher uses capacitive output coupling to produce brighter shorter flashes and has a much lower average current drain than standard bicore or 74HC14 flashers. The PS Flasher with one LED circuit (2 LEDs) runs all night from a 1F capacitor....
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This circuit enables you to connect your camera with very long wire. The circuit is actually a video amplifiers. At the sender part, the amplifier is used to...
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Control a furnace using a 3. 3V microcontroller. The furnace operates by connecting a common 21V AC "hot" line to one of two AC "neutral" output lines: Fan and Heat. When connected they have relatively low current flow, ~100mA. I`ve had some success using a....
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The Elector Crescendo was my first DIY amp that wasn`t a kit. I borrowed the Elector magasins at our local library and had some `amateur` make the....
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The DS2715 is a complete NiMH (Nickel Metal Hydride) smart-charger solution with load detection well suited to low-cost applications....
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The present document shows step by step how to easily build an interesting pointing device: the wireless tilt mouse, that allows to control the mouse?s cursor on the PC screen through the tilt of the board itself. The analog data from a 3-D accelerometer and....
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The combination of the LM4651 driver IC and the LM4652 power MOSFET Class D power amplifier IC provides a high efficiency amplifier solution, suitable for self-powered speakers, subwoofers and quality car boosters. The LM 4651 is a fully integrated....
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Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music transmitter and receiver. The IR music transmitter works off a 9V battery, while the IR music receiver works....
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The new 14-bit, 800ksps LTC®1419 enhances new communications, spectral analysis, instrumentation and data acquisition applications by providing an upgrade path to users of 12-bit converters. It provides outstanding 81.5dB SINAD (signal-to-noise and....
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The circuit, built around a single integrated circuit (Ul, an MC3403P quad op amp), three transistors (Q1-Q3), and a few support components,.receives its input from the antenna (ANT1). The signal is fed through a high-pass filter, formed by CI, C2, and Rl,....
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This is the schematic for an FM transmitter with 3 to 3. 5 W output power that can be used between 90 and 110 MHz. Although the stability isn`t so bad, a PLL can be used on this circuit. This is a circuit that I`ve build a few years ago for a friend, who....
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An audio cross-over network is used inside a speaker to separate or filter audio signals of different frequencies to different speakers within a speaker cabinet designed to handle those frequencies. This particular crossover network uses two passive....
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A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance. This is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, BC549C may be used with little change in....
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Dragon -ZL-2801A DVD machine type switching power supply circuit It shows Dragon ZL-2801A type DVD machine switching power supply circuit, which is mainly from the AC input cir..
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The circuit uses a track-and-hold amplifier in a closed-loop configuration to clamp the back-porch voltage of a standard video waveform to 0 V. The circuit"s outputs include a clamped composite-video signal and a TTL-level horizontal-blanking pulse.....
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FAN4810 work, to the average current, electric current of front continuously CCM The work pattern of voltage output rises, the internal treble safe detection technique can make the circuit avoid making the circuit not in normal operating conditions because....
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This PIC microcontroller tutorial provides a simple calculator implementation for PIC16F877 microcontroller. This is a simple one digit calculator which im....
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This circuit uses a Cmos 4017 decade counter to create a sequence of four separate events. The number of events in the sequence may be increased to nine or ten. And the length of each event is controlled independently. D13 causes the sequence to repeat....
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ADC (Analogto digital converter) forms a very essential part in many embedded projects and this article is about interfacing an ADC to 8051 embedded controller. ADC 0804 is the ADC used here and before going through the interfacing procedure, we must neatly....
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PWM is a device that may be used as an efficient light dimmer or DC motor speed controller. Function: for a general purpose device that can ....
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On-Glass Antenna Amplifi er AGC IC LA1070 The LA1070 is an Automatic gain control IC for use with automotive on-glass Antennas By Sanyo Semiconductor Corporation ..
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BA6104 Five-digit LED level meter driver IC basic application circuit BA6104 Since the input stage that uses a PNP transistor base composite input, so the input impedance is hi..
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As shown by a diode temperature sensor 3-digit thermometer, 3 digits the A/D converter and display driver lC L7106/7107 to amplify the signal, A/D conversion, and a series of d..
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Operation of the circuit. Circuit is divided into three parts: low frequency production. The manufacturing high frequency and extension of production low frequency is obtained from IC1 connected to astable multi vibrator circuit frequency is set by R1, C2....
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Assortment of Siren Circuits. This month I am making 3 different types of siren circuits based on the 555 timer. The first circuit simulates the siren of a British police car. It uses two...
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ADC is a circuit formed in a single functioning chip to change analog signal becomes digital signal. In general we apply chip ADC 8 beet to change analog signal stretch 0-5 V becomes digital level 0-255 for ADC 8 beet. At the moment have also been in big....
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This is a great audio amplifier circuit based on single power IC TDA7294. TDA7294 is intended for use as a high quality audio class AB amplifier in hi-fi applications. It has very low noise ..
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Using circuit below, we can animate the bike turning signal using LED. The bike turning signal will blink from the right side (D1) to the left side (D5) in a....
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This simple three-phase tester, uses only a small current thyristor as a main element for testing the right or wrong succession of the three phases, and there is no need for a supplementary power supply. The basic circuit is shown in Fig. 69-4A. When....
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Non inverting audio amplifier schematic. This Non-inverting audio amplifier circuit may be applied to Multi-channel audio systems, stereo phonographs, tape recorders and players, AM-FM radio receivers, servo amplifiers, Intercom systems, Automotive products.....
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This circuit is one of the simplest voltage to current converters to drive low loads. In this example a small 0, 25 Watts speaker, with 8 © resistance, is driven. It is suitable for microcontroller designs or any other circuit that uses PWM (TTL logic). You....
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The reading lamp consists of a small solar panel, a standard UPS style lead acid battery, and an LED circuit board. The circuit board contains a low power solar charge controller (regulator), a set of 8 white LEDs, a switch, an LED current regulator, and a....
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As shown in FIG grounds MAX4108/4109/4308/4309 using the capacitive load driving circuit isolation resistor Rs constituted. MAX4108/4109/4308/4309 good AC characteristics, but ..
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The NE5561 provides pulse-proportional drive and speed control based on de tachometer feedback. This simple switching circuit consists of transistor 2N4920 pnp with a commutation diode used to deliver programmed pulse energy to the motor. A frequency of....
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This digital thermometer circuit diagram uses a common 1N4148 diode as the temperature sensor. The temperature coefficient of the diode, -2 mV / 0C is expl...
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This White LED lights illuminates your porch with cool white light. The circuit is too simple and energy saving design. Its current consumption is practica...
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A simple boost circuit that gives 30 volts pk/pk output using a 9 volt battery. The addition of a Ge diode bridge makes a surprisingly good octave box...
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This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and should be available from many parts stores...
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Here we have an astable oscillator built around 555, which gives an alarm tone of 1. 8 KHz directly driving a speaker. This is basic alarm circuit, which is later used in many other projects in the book. While the circuit shows only 1. 8 KHz operation, it....
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Circuit generates low-frequency waveform whose amplitude is equivalent to that of unknown r-f voltage, using photochopper modulator VI-V2 as error detector. Arrangement gives seven voltage ranger from 10 my rms to 10 v rms full scale, over frequency range of....
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Face through attendance as the worlds first embedded facial recognition machine, the error rate is less than one hundred thousandth of the rejection rate of less than one perce..
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When S2 is ON, the circuit here operates as an astable multi vibrator and the LED is lit for about o. 1sec, flasing every 1. 5 seconds. Since the human reaction time is more than this, you cannot catch it once it is seen o, by pressing S1. If your sense of....
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The ML7005 is a multi-functional DTMF transceiver LSI with built-in a DTMF signal generator, a DTMF signal receiver, a call progress Tone generator, a call progress Tone detector, and a FAX (FX) signal detector. Each functional block CAN be controlled by an....
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Pretty nice design for a cheap consumer grade flashlight. The power switch was not exactly as shown since there was an option to have the lamp on solid...
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Amplifier circuit is also very suitable when used in fm radio receiver. Supply voltage required 8 - 25 Volt DC with a maximum output power 0. 15W. See Schematic below...
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This page is for info on converting the low resolution optical encoders, typically found in serial mice, into high resolution encoders needed for DSC`s (Digital Setting Circles), for your telescope, etc. The serial mouse encoders I found had the dpi stamped....
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We`ve already seen one example of a monostable multivibrator in use: the pulse detector used within the circuitry of flip-flops, to enable the latch portion for a brief time when the clock input signal transitions from either low to high or high to low. The....
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Park Aid Three LEDs signal bumper-barrier distance Infra-red operation, indoor use Circuit diagram: Parts: R1 10K 1/4W Resistor R2,R5,R6,R9 1K 1/4W Resistors R3 33R 1/4W Resistor R4,R11 1M 1/4W Resistors R7 4K7 1/4W Resistor R8 1K5 1/4W Res....
In practical cases a series resistance has always to be inserted, having it the double purpose of limiting the current at pin 7 and to smooth down the stand-by ON/OFF ..
General connection method of fluorescent lamp Fluorescent lamps used in homes and public places lighting and so on, with luminous efficiency, long service life, Figure 20 is the general wiring diagram for lamp. Fluorescent working principle: When the switch....
The LTC1063 is the first monolithic low-pass filter that simultaneously offers outstanding dc and ac performance. It features internal or external clock tunability, cutoff frequencies up to 50 kHz, 1-mV typical output dc offset, and a dynamic range in....
Operating a stepper motor using a fixed (constant) voltage supply results in poor torque at high speeds. In fact, stepper motors tend to stall at fairly low speeds under such conditions. Several approaches can be used to overcome this problem, one of which....
This circuit is next experiment to build high quality DAC with optical input TOSLINK, electrical input S/PDIF and USB input. Both electrical inputs are galvanic separated from DAC. This circuit was thought like part of preamplifier / headphone amplifier with....
Using this circuit diagram, can be designed a very simple AC voltage converter, which converts the 240V AC power to a voltage of 110V. Circuit can be successfully used to power electrical devices that require a supply voltage of 110V. If su....
Circuit shown in Figure 3-83. The figure shows that only when the contactor KMi after pull (ie, after the motor Mi first start), KM2 to pull (ie Mz after start) ..
Does anyone know what circuit i can use to make a dc motor randomly move backward and forward, stop for a period of time and then start again Any help and ideas will be much apreciated. Google and read about how to wire up PICs. In the simplest sense, it....
The circuit in Figure 1 comprises IC1, a Microchip PIC12F675 microcontroller driving IC2, a Kingbright AAF5060PBESEEVG "rainbow" indicator that contains three ultrabright LED chips (red, green, and blue) within one package. Modulating each LED`s duty cycle....
A frequency reference for tuning up the RS-232 to 100 MHz RF desktop channel adapter elsewhere on this site, when I found this Saronix crystal oscillator in my junk box. A few minutes with AVRStudio produced an ATtiny12 to make a tone - even fewer parts....
As demand for VRM output current being bigger and bigger, the components and parts of SR-Buck converter can not already meet the demand for the microprocessor 100 A of new generation; In addition, the filtering inductance of making the heavy current is very....
An DIY RF decibel (or power) meter is an indispensable instrument in any radio workshop. Unfortunately, accurate, wideband models are fairly expensive, and....
This circuit is a missing pulse detector. It is used in the_ General Purpose Controller Board with Basic Stamp 1. This circuit is used to monitor an input pulse train, and when a pulse is missed the 555 timer output will switch low. For the General Purpose....
In hybrid system, analog system with digital control, a voltage controlled things is very important since it can be interfaced by DAC from digital system. For....
This circuit consists of a single transistor as amplifier and it gives a nice amplification to weakest and unipolar signals for feeding to a real amplifier. Don`t post your email or phone number in the comment box. Only put email address in the email field.....
Circuit works: Figure shows a dedicated stepping motor controller L297 key pin, 17 feet (cw / ccw) is used to control the stepper motor rotation direction..
A two transistor circuit that flashes two LEDs on and off alternately. This tutorial shows beginners in electronics how to build the easy circuit on breadboard....
Here is a very useful project of an automatic street light or lamp circuit which can be used to activate your outdoor lights like garden lamps, night lights etc. automatically when the sun set and turn off automatically when the sun rises. The circuit is....
This is one of the simplest stereo balance indicator circuit that you can have. The circuit will give a visual indication (using two LEDs) proportional to the difference in balance between the left and right channels of a stereo system. The circuit is based....
Originally Posted by kalena555 Dear Mark, The bit of info of getting the motor to run without the tubes is new info to me. So much learn XD. Well now....
This circuit enables observation of movement between other stroboscopes. Generation of rectangular signal is based on NE555. This circuit requires a low power supply that is made from a simple transformer TR1, traditional rectifier bridge and zener diode.....
The idea behind this project is to provide some means of loading a program into a PIC that will then be able to program other PICs in a more conventional way. How do you program a PIC to be a programming device without a programmer, and why would you want to....
A common LED driver requirements are: The LED string voltage and the input voltage is very wide and overlapping. In fact, some designers prefer to use with a LED driver circuit..
The circuit can measure the frequency between 1. 5kHz ~ 500kHz by connecting C1 ~ C6 different capacitors. The maximum frequency is up to 1MHz. Transistor T1 can be used as the integrator, and its load resistor is 15k © resistor and R1 ~~ R6 adjustable....
tutorials reviews software airsoft Introduction This project illustrates how to connect a PC to a small FRS radio via a simple RS-232 interface. There are several reasons that you may want to....
Initially I chose another infrared sensor for test, PIR Motion Sensor, which was to detect any motion in front of the sensor but it turened out not so sensitive. So that I looked at this QRD1114 IR Sensor for substitute. In this test, I used both as digital....
If the TV receiver in question does not have a video input and its owner is reluctant to vandalise it in order to fit one then this sort of modulator is the obvious solution. It is a simple circuit that processesvideo signals to enable them to be fed....
Above diagram is the circuit of Lithium-ion (Li-ion) battery charger which built based single chip MAX1879. This is the simple and low cost battery charger for single-cell Li+ battery that does not dissipate power (no heat. The MAX1879, in conjunction with....
Apex seems i begin to love this amp the corrected clear schematic is this with different R14 values(tried 22k,30k,56k) and different supply....
This area shows the construction and testing of a medium to large class Tesla coil. In this section, the previous coils were dismantled and a new larger coil, with a secondary over 6 inches, was redesigned and constructed for maximum efficiency at a power if....
This simple window detector uses only half of a 7400 quad NAND gate plus four resistors, chosen so that the voltage at point A exc.,eds the voltage at point B for any input voltage. With no input applied or when VIN is at ground, the output of gate Gl is....
ArduinoISP Bootloader/Programmer Combination Shield (not shown) & Arduino with USB to serial chip (e. g. Arduino Uno ) to upload the bootloader and sketches to DIYduino. You can also use a USBtoSerial programmer for uploading a sketch and work around the....
The telephone-line decibel meter and line-voltage sensor shown lets you accurately monitor and adjust telephone sound levels. The 600-0 resistor properly terminates the line. ..
This is a simple LED blinking project using PIC16F877A. Basically there are only 2 LEDs, connected to PIC16F877A and the source code is being modified from the 16F template....
The PCB is at the center of any electronic product. Literally, the enclosure surrounds the board, and figuratively, all the mathematics, the science, the software, these all run on the board. That’s why the PCB is at the center of our tools, and our company.....
The LA1600 being an AM Tuner IC placed in a 9-pin SIP, provides the functions of an AM Tuner It is usable in the band range up to SW band and is especially suited for use in low-cost AM Radios and radio-controlled receivers. By Sanyo Semiconductor Corporation ..
This be mini size power amplifier 2 watt OTL that use IC LM380. Be base readymade circuit for side sound work and the communication. Which use outside equipment adds least. The C6 can choose get many the value since 47uF to at 470uF which, have a voice good....
The Electronic Dazer is a modern, portable, personal-protection appliance. It generates hight potential energy to ward off vicious animals or other attackers. It is an aid to help exape from a potentially dangerous situation. the device develops about 2,000....
The LTC ®6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz. It can be used as a fixed-frequency or voltage-controlled oscillator (VCO). The LTC6990 is part of the TimerBlox ® family of versatile silicon timing....
The amplifier`s gain is nominally 20 dB. Its frequency response is determined primarily by the value of just a few components-primarily C1 and R1. The values of the schematic diagram provide a response of ±3. 0 dB from about 120 Hz to better than 20, 000 Hz.....
The CD4069 or 74C04 hex inverter—is used as^ fixed-frequency oscillator centered around 100 kHz. U2 contains the variable frequency oscillator and balanced modulator. The CD4046 is a phase-locked loop and R3, R4, and C2 determine the center frequency of....
Used buba oscillator and it didn`t oscillate in the begining. first thing you should check the basics. a little error in cap, res and inductor values makes a huge difference. try calculating the component values with multimeter and i bet cap value wont be....
This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent....
Want a regulated voltage that can be adjusted to suit your application? This Adjustable Power Supply is small, easy to build and can be adapted to produce....
The PowerSaver Flasher uses capacitive output coupling to produce brighter shorter flashes and has a much lower average current drain than standard bicore or 74HC14 flashers. The PS Flasher with one LED circuit (2 LEDs) runs all night from a 1F capacitor....
This circuit enables you to connect your camera with very long wire. The circuit is actually a video amplifiers. At the sender part, the amplifier is used to...
Control a furnace using a 3. 3V microcontroller. The furnace operates by connecting a common 21V AC "hot" line to one of two AC "neutral" output lines: Fan and Heat. When connected they have relatively low current flow, ~100mA. I`ve had some success using a....
The Elector Crescendo was my first DIY amp that wasn`t a kit. I borrowed the Elector magasins at our local library and had some `amateur` make the....
The DS2715 is a complete NiMH (Nickel Metal Hydride) smart-charger solution with load detection well suited to low-cost applications....
The present document shows step by step how to easily build an interesting pointing device: the wireless tilt mouse, that allows to control the mouse?s cursor on the PC screen through the tilt of the board itself. The analog data from a 3-D accelerometer and....
The combination of the LM4651 driver IC and the LM4652 power MOSFET Class D power amplifier IC provides a high efficiency amplifier solution, suitable for self-powered speakers, subwoofers and quality car boosters. The LM 4651 is a fully integrated....
Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music transmitter and receiver. The IR music transmitter works off a 9V battery, while the IR music receiver works....
The circuit, built around a single integrated circuit (Ul, an MC3403P quad op amp), three transistors (Q1-Q3), and a few support components,.receives its input from the antenna (ANT1). The signal is fed through a high-pass filter, formed by CI, C2, and Rl,....
This is the schematic for an FM transmitter with 3 to 3. 5 W output power that can be used between 90 and 110 MHz. Although the stability isn`t so bad, a PLL can be used on this circuit. This is a circuit that I`ve build a few years ago for a friend, who....
An audio cross-over network is used inside a speaker to separate or filter audio signals of different frequencies to different speakers within a speaker cabinet designed to handle those frequencies. This particular crossover network uses two passive....
A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance. This is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, BC549C may be used with little change in....
Dragon -ZL-2801A DVD machine type switching power supply circuit It shows Dragon ZL-2801A type DVD machine switching power supply circuit, which is mainly from the AC input cir..
The circuit uses a track-and-hold amplifier in a closed-loop configuration to clamp the back-porch voltage of a standard video waveform to 0 V. The circuit"s outputs include a clamped composite-video signal and a TTL-level horizontal-blanking pulse.....
FAN4810 work, to the average current, electric current of front continuously CCM The work pattern of voltage output rises, the internal treble safe detection technique can make the circuit avoid making the circuit not in normal operating conditions because....
This PIC microcontroller tutorial provides a simple calculator implementation for PIC16F877 microcontroller. This is a simple one digit calculator which im....
This circuit uses a Cmos 4017 decade counter to create a sequence of four separate events. The number of events in the sequence may be increased to nine or ten. And the length of each event is controlled independently. D13 causes the sequence to repeat....
ADC (Analogto digital converter) forms a very essential part in many embedded projects and this article is about interfacing an ADC to 8051 embedded controller. ADC 0804 is the ADC used here and before going through the interfacing procedure, we must neatly....
PWM is a device that may be used as an efficient light dimmer or DC motor speed controller. Function: for a general purpose device that can ....
On-Glass Antenna Amplifi er AGC IC LA1070 The LA1070 is an Automatic gain control IC for use with automotive on-glass Antennas By Sanyo Semiconductor Corporation ..
BA6104 Five-digit LED level meter driver IC basic application circuit BA6104 Since the input stage that uses a PNP transistor base composite input, so the input impedance is hi..
As shown by a diode temperature sensor 3-digit thermometer, 3 digits the A/D converter and display driver lC L7106/7107 to amplify the signal, A/D conversion, and a series of d..
Operation of the circuit. Circuit is divided into three parts: low frequency production. The manufacturing high frequency and extension of production low frequency is obtained from IC1 connected to astable multi vibrator circuit frequency is set by R1, C2....
Assortment of Siren Circuits. This month I am making 3 different types of siren circuits based on the 555 timer. The first circuit simulates the siren of a British police car. It uses two...
ADC is a circuit formed in a single functioning chip to change analog signal becomes digital signal. In general we apply chip ADC 8 beet to change analog signal stretch 0-5 V becomes digital level 0-255 for ADC 8 beet. At the moment have also been in big....
This is a great audio amplifier circuit based on single power IC TDA7294. TDA7294 is intended for use as a high quality audio class AB amplifier in hi-fi applications. It has very low noise ..
Using circuit below, we can animate the bike turning signal using LED. The bike turning signal will blink from the right side (D1) to the left side (D5) in a....
This simple three-phase tester, uses only a small current thyristor as a main element for testing the right or wrong succession of the three phases, and there is no need for a supplementary power supply. The basic circuit is shown in Fig. 69-4A. When....
Non inverting audio amplifier schematic. This Non-inverting audio amplifier circuit may be applied to Multi-channel audio systems, stereo phonographs, tape recorders and players, AM-FM radio receivers, servo amplifiers, Intercom systems, Automotive products.....
This circuit is one of the simplest voltage to current converters to drive low loads. In this example a small 0, 25 Watts speaker, with 8 © resistance, is driven. It is suitable for microcontroller designs or any other circuit that uses PWM (TTL logic). You....
The reading lamp consists of a small solar panel, a standard UPS style lead acid battery, and an LED circuit board. The circuit board contains a low power solar charge controller (regulator), a set of 8 white LEDs, a switch, an LED current regulator, and a....
As shown in FIG grounds MAX4108/4109/4308/4309 using the capacitive load driving circuit isolation resistor Rs constituted. MAX4108/4109/4308/4309 good AC characteristics, but ..
The NE5561 provides pulse-proportional drive and speed control based on de tachometer feedback. This simple switching circuit consists of transistor 2N4920 pnp with a commutation diode used to deliver programmed pulse energy to the motor. A frequency of....
This digital thermometer circuit diagram uses a common 1N4148 diode as the temperature sensor. The temperature coefficient of the diode, -2 mV / 0C is expl...
This White LED lights illuminates your porch with cool white light. The circuit is too simple and energy saving design. Its current consumption is practica...
A simple boost circuit that gives 30 volts pk/pk output using a 9 volt battery. The addition of a Ge diode bridge makes a surprisingly good octave box...
This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and should be available from many parts stores...
Here we have an astable oscillator built around 555, which gives an alarm tone of 1. 8 KHz directly driving a speaker. This is basic alarm circuit, which is later used in many other projects in the book. While the circuit shows only 1. 8 KHz operation, it....
Circuit generates low-frequency waveform whose amplitude is equivalent to that of unknown r-f voltage, using photochopper modulator VI-V2 as error detector. Arrangement gives seven voltage ranger from 10 my rms to 10 v rms full scale, over frequency range of....
Face through attendance as the worlds first embedded facial recognition machine, the error rate is less than one hundred thousandth of the rejection rate of less than one perce..
When S2 is ON, the circuit here operates as an astable multi vibrator and the LED is lit for about o. 1sec, flasing every 1. 5 seconds. Since the human reaction time is more than this, you cannot catch it once it is seen o, by pressing S1. If your sense of....
The ML7005 is a multi-functional DTMF transceiver LSI with built-in a DTMF signal generator, a DTMF signal receiver, a call progress Tone generator, a call progress Tone detector, and a FAX (FX) signal detector. Each functional block CAN be controlled by an....
Pretty nice design for a cheap consumer grade flashlight. The power switch was not exactly as shown since there was an option to have the lamp on solid...
Amplifier circuit is also very suitable when used in fm radio receiver. Supply voltage required 8 - 25 Volt DC with a maximum output power 0. 15W. See Schematic below...
This page is for info on converting the low resolution optical encoders, typically found in serial mice, into high resolution encoders needed for DSC`s (Digital Setting Circles), for your telescope, etc. The serial mouse encoders I found had the dpi stamped....
We`ve already seen one example of a monostable multivibrator in use: the pulse detector used within the circuitry of flip-flops, to enable the latch portion for a brief time when the clock input signal transitions from either low to high or high to low. The....
Park Aid Three LEDs signal bumper-barrier distance Infra-red operation, indoor use Circuit diagram: Parts: R1 10K 1/4W Resistor R2,R5,R6,R9 1K 1/4W Resistors R3 33R 1/4W Resistor R4,R11 1M 1/4W Resistors R7 4K7 1/4W Resistor R8 1K5 1/4W Res....
