Popular Circuits Page 39
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A milliohmmeter is just the tool for checking trace resistance on a printed circuit board, tracking down shorted traces, and measuring the contact resistance of a switch or connector. Its the kind of tool that would come in real handy occasionally, but not....
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Bubba oscillator is another example of phase shift oscillator. The Bubba oscillator takes the advantage of quad op-amp package to get 45 degree phase shift for...
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The MP3 files (up 65, 536) are stored in a micro SDcard. This embedded MP3 module is an universal and compact circuit (37 mm x 27 mm) for playing MP3 audio files. The MP3 module can be used in embedded systems. Usually, the audio output from a laptop`s....
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This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys. With SW1 positioned as shown in the circuit diagram, the typical dual-tone sound of Police or....
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In this circuit LM335 used to temperature sensor circuit, an IC that converts the ambient temperature into an equivalent output voltage ....
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Basically, the circuit consist of two balanced. Simple BFO metal detector. BFO ( beat frequency Ready assembled and tested circuit board Chip in the center is Pic 12F675 Passive detector uses the detector coil in a frequency depended part of a circuit, This....
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This project creates a simple but valuable a wireless remote controller. He has as many as 6 channels (a rare feature for remote business) and transmits encoded MM53200 , UM3750 or UM86409 . Of course you can omit the button and make such a 2-channel remote....
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This is a simple but efficient Electronic lock. This lock can be used to protect any electronic systems from unauthorized usage. To get access the uses needs to know 8 digit pass-code or password. When the user enters correct 8 digit password followed by....
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The design is based loosely on some ideas from K8CU and AG6K. However, I have simplified the circuit somewhat and used different components. The mechanical encapsulation is also different. I used LTspice to verify the tester before building it. The schematic....
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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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When the circuit is connected to the hi-fi equipment or at both ends of the electronic instruments speaker, the audio level can be modulated to 500W lamp by proportion. Using 3 appropriate sets of audio filters and 3 different color light Union microscopy to....
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As shown, the switching circuit comprises a buck rectifier circuit, the bistable trigger circuit and the thyristor control circuit. Implement remote control for electrical equipment turned on or off...
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Circuit shown in Figure 3-130. The line differs from FIG 3-129 line that press the stop button SB3, the electric motor begins braking. In addition, start-up and braking, the mo..
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Channel 7 has a circuit diagram of a smart temperature sensor MAX6698 is shown in Figure: MAX6698 maximum temperature with three transistors (VT1 ~ VT3) and three thermistors (..
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The circuit is activated by an LED/photoresistor isolator (Ul), which is a combination of a light-dependent resistor (LDR) and an LED in a single package. That device was chosen because of its high isolation (2000 V) characteristic, which is necessary....
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The main features of this powerful MULTIWATT Package (a trademark of SGS-THOMSON Microelectronics), a power amplifier IC chips designed specifically for car radio application, are the high current capability (3. 5A) and the capability to drive a very low....
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MK484 AM receiver circuit A simple AM receiver circuit based on the MK484 AM receiver IC from Rapid Electronics Ltd is shown here. MK4844 is a monolithic integrated circuit that has all the necessary sections of a AM receiver like RF amplifier, detector, AGC....
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The circuit of this device is quite simple: an input circuit filters the signal provided by the antenna to reduce sensibility to other phenomena and protects against over voltages. The four transistors realize a "one-shot" section that is triggered by the....
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This 3 band equalizer circuit is an active filter network for bass, mid and high audio ranges. It is designed around the LM833 opamp from National Semiconductors. This opamp IC has the following charactersistics: very low noise figure, wide....
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Large moving-coil meters may require significant amounts of current for full-scale deflection, and using a shunt resistor may prove impractical when the meter current is larger than the current you are measuring. You can solve the problem by driving the....
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There are a lot of alarm systems on the market but you might be inclined to build your own. This little project can be put together using inexpensive parts readily available. The alarm transmitter module allows for a delayed trigger and auto turn-off as it....
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Thanks to the fully complementary PNP/NPN output configuration the TDA7383 allows a rail to rail output voltage swing with no need of bootstrap capacitors. The extremely reduced components count allows very compact sets. The on-board clipping detector....
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The TEA1069 and TEA1069A contain all the functions needed to build a highly featured, high-performance fully electronic telephone set. The device incorporates a speech/transmission part, a dialler part and a ringer part. By offering a wide range of possible....
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DC generator automatic voltage regulator circuit is shown in Figure 7-53. This circuit is used to 40kW, 230V DC shunt complex machine, the voltage change rate up to 2.5 percent..
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When the switch is closed or the FET is conducting, the circuit behaves as an inverting amplifier with a gain of R2/Rl. Since as the inverting tenninal of the op amp is a virtual ground, the capacitor is kept charged to the output voltage by the op amp.....
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Another method uses Zhu gall thyristor delay lamp circuit. Usually, 220V AC via vr), vs, (,, c: isoelectric consisting of step-down voltage half-wave rectifier circuit, in f st..
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This Car LED Light Sequencer uses a standard 74C164 8 bit shift register as its heart of operation. The 74C164 is also known as a 8-Bit Parallel-Out Serial Shift Register which is a monolithic complementary MOS (CMOS) integrated circuit. These 8-bit shift....
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As a fully-featured Linux computer there are many external programmers that can be used with your Raspberry Pi to program the Atmel AVR range of microprocessors. It`s also possible to use the general purpose input/output lines (GPIOs) found on the Raspberry....
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I just bought a 1997 dodge dakota extend cab sport how can i find a tail light wire diagram or brake light diagram ?....
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Since the publication of the type 144 theremin project article in September, 1998, many of them have been successfully constructed. As in the 144, and its forerunner, the Southwest Technical Products model 142, the 145 theremin retains a heterodyne topology....
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The circuit will find excellent usage in high frequency line driving systems that require wide-power bandwidths at high output current levels. (IC=HA2530) The bandwidth of the circuit is limited only by the single pole response of the feedback....
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When the upper or lower limit is exceeded, the LED lights up. Positive feedback to one of the nulling terminals creates 5 to 20 p,V of hysteresis on both amplifiers. This feedback changes to offset voltage of the LT1002 by less than 5 p,V. ..
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Adding a diode, a resistor, and a capacitor to the SAW (surface-acoustic-wave) oscillator allows you to use the oscillator in FSK (frequency-shift-keying) applications. Dl, Rl, and Cl form a simple diode switch in which Dl shunts Cl to ground. When the....
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This is another project which fullfills a need. I once built a frequency counter using plain TTL chips. That was long before the CMOS HC versions, even before LS was available. It uses only 4 chips - 3 HC TTL`s and an Atmel At90S2313 microcontroller. It has....
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20W + 20W of stereo amplifier consists of two complete, independent 20-watt RMS amplifier in bridge. The input source is brought into the shunt voltage amplifier, it is by R1, ..
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With this circuit mounted in or near every phone in the house, it will allow users to know if the phone is being used and not to pick up the phone. When a phone is taken off hook, the voltage across the tip and ring terminals drops to 10 volts or less. This....
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Many modern audio recorders is now compatible with digital input S / PDIF (Sony / Philips Digital Interface). Devices like CD Changers, MiniDisc recorders, computer sound cards and the like. working with digital signal just with protocol S / PDIF. Digital....
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A professional suggestion for those interested in improving sound. The circuit constitutes the part of input mixing console sound from the microphone or source of high level . It can be used on it's own or be multiplied to the number of channels required.....
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TheCA3189E is a comprehensive FM-IF system designed for high fidelity FM tuners. It includes a three stage FM-IF amplifier/limiter configuration with level detectors for each stage, a double-balanced quadrature FM detector and an audio amplifier that....
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This circuit can be designed to attenuate signal frequency. Customizable from 1 to 40 dB. If you want to use the band uhf, should be fitted within the frame shield, and C1 to C3 type feeds true. The line should be as short as possible, and the diode should....
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This electronic project stereo amp is based on the STK415-090-E class H audio power amplifier hybrid IC that features a built-in power supply switching circuit. This STK415-090-E class H audio power amplifier provides high efficiency audio power....
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The ADP1864 is a compact, inexpensive, constant-frequency current-mode step-down dc-to-dc controller. The ADP1864 drives a P-channel MOSFET that regulates an output voltage as low as 0.8 V with ±2% accuracy, for up to 5 A load currents, from input voltages....
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This fm transmitter circuit is very simple and it has a acceptable transmission. The signal transited from this fm transmitter circuit can be received at almost 300 meters in open air. The circuit require a 3volts operating voltage and can be tuned anywhere....
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There are actually very few electronic components necessary for this project as the PIC Microcontroller is the powerhouse doing most the work. The few components necessary like, buttons, switches & power circuit are trivial forms of I/O which makes....
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This high-performance video-camera link transmits signals from your video camera to your VCR, or from your VCR to TVs throughout your home. The first stage of the rf chain is a crystal-controlled oscillator, Q1, with a frequency of 60 to 65 MHz, which is....
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DIY Intercom Circuit Intercom Cable Full-duplex Intercom circuit schematic , cable on the way to the intercom circuit....
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The RF amplifier is similar to the one used in the 2. 5MHz amplifier. At a frequency of 10MHz the capacitances of a power MOS-FET become significant. Noiseless feedback by the use of transformers is no longer straightforward. Intermodulation and overtones....
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This circuit uses a positive-feedback loop closed around~a combined comparator and integrator. When power is applied, the output of the comparator will switch to one of two states, to the maximum positive or maximum negative voltage. This applies a peak....
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The FET amplifier, for those focused on the tube sound, which for various reasons can not be made after the courage to Jiang Sheng-class enthusiasts. bipolar FET tube amplifier and the output characteristics very similar, the frequency characteristics of a....
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The kit includes the following items (depending on which bootloader chip 16MHz or 8MHz) The kit includes the essential items to create your own Arduino 328 board. Here is a breadboard with all the components mounted and running the demo led flash program You....
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In some video applications, the signal sources deliver RGB signals and a composite sync signal. The RGB signals contain no video sync. At the receiver side, some low-cost video decoders do not have a stand-alone composite sync input; they only accept the....
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BattMan II is a computer controlled battery manager, intended for typical rechargeable batteries used by R/C and electronics hobbyists, as well as various consumer product batteries. BattMan II has the following capabilities: Works with Nickel-Cadmium....
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A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps. Simple to build, simple to make, nothing too complicated here. However you must use the CMOS type 555 timer designated the 7555, a normal 555 timer will not work here due to the....
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This is extremely simple to build PIC Temperature meter that allows to measure temperature in two different locations at the same time. Never before such a useful and powerful circuit could be built with so little components and yet provide endless....
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Dry Cell Charger utilizing very few component for recharging dry cell 6 to 8 time using principle PCR (Periodic Current Reversal) circuit diagram of various project...
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Open and Short Circuit Test on Transformer are done to elect equivalent circuit of transformer, voltage regulation of transformer and efficiency of transformer....
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In the circuit shown, a CMOS op amp controls the current through a p-channel HEXFET power transistor to maintain a constant voltage across RL The current is given by: 1 ~ VREF/Rl. ..
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22kW and below hoist with power-saving circuit Y- conversion circuit shown in Fig. The circuit on the basis of general hoist circuit adds a CJ20-10A exchange contact contactor ..
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A admirable diy gsm jammer or cellular adaptable buzz jammer schematic diagram for use alone in GSM1900 with abundance from 1930 MHz to 1990 MHz. The GSM1900 cellular corpuscle buzz arrangement is fabricated use of by USA, Canada and best of the nations in....
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The purpose of this circuit is that of power a lamp or other apparatus for a given time (30 minutes in this case), and then to turn it off. It`s useful when reading at bed by night, turning off the bedside lamp automatically in case the reader falls asleep.....
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This circuit filters noise, such as glitches and contact bounce, from digital signals. You can easily adjust the circuit for a wide range of noise frequencies. The circuit"s output changes state only if the input differs from the output long enough for....
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The circuit drives the LCD pins with 50% square waves. Each segment on this LCD is connected to the COM backplane and a separate pin. When a pin is driven in phase with the COM pin, the corresponding LCD segment gets zero voltage, and is off. When a pin is....
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This is one of the most cost effective (cheap) and simple emergency light circuit developed for CircuitsToday This is an automatic emergency lamp with day light sensing, means it senses darkness/night and turns ON automatically. Similarly it senses day light....
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This instrument requires two precision components: A precision capacitor and a precision inductor. You only need to start with one precision component, either the reference capacitor or the reference inductor, and using this meter, you can select or adjust....
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The Altera USB-Blaster is an efficient USB JTAG programmer. Clones sell for US$10 or less. The programmer comes with a comprehensive manual with a pinout diagram for the JTAG device side. [1] That diagram unfortunately shows no orientation. There should be a....
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Im wiring up my 1964 xm and not sure where the wires go for the temp gauge on the back of the gauge theres an I S A the wore are Green/Black Red/White Yellow/Blue do you have any idea Thanks Haydon Ask-a-doc Web sites: If you`ve got a quick question, you can....
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This circuit develops an output voltage that is proportional to the magnetic induction, B, flowing through its probe"s coi..
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This video is a demonstration of reading an analog voltage, computing data, and controlling LEDs. I am using a Sharp GP2D12 Infrared (IR) sensor. More information about sharp distance sensors. The PDQ board connects to your host PC via a serial cable,....
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In the 100-kHz application from left to right, the coupling network feeds into the receiver ~section on the bottom of the chip. (The external components are summarized later.) The receive data output is pulled up via RPuLL ~ 10 K!l. A minimum current of 10....
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Cascading two identical integrators will thus result in an overall phase shift of 180° and an amplification of unity (p..
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As shown in the figure, it isa sensing automatically lightmade by newHN911L pyroelectric infrared detection module. The HN911L integrates high - sensitivity infrared sensors, PIR, amplifiers, signal processing circuit andoutput circuit. Itisable to remote....
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A circuit diagram of the T1 is a low-impedance output transformer, it comes with 5000-8 ohm resistor. ..
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The following circuit shows about Ultrasonic Receiver Sircuit Diagram. Thicircuit based on the CA3140IC. Features: The frequency of sound produced ....
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This general-purpose low-power (5 W) audio amplifier is suitable for driving a spe..
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The DS1602 and DS1603 from Dallas Semiconductor offer a simplified hardware solution for keeping time as well as tracking powered up time of a system. The DS1602 and DS1603 can be read and written directly by a microprocessor or microcontroller using simple....
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This is a fun and non-dangeros project for those people who like to throw projectiles magnetically. It simply works by placing a ferromagnetic projectile at one end of a coil and pulsing some power in it. The trick is to switch off power when the projectile....
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A 13.56-MHz, ISM (industrial, scientific, and medical)-band RF-measurement device had the test requirement of a 50-hour, 1-kW burn-in. The device under test needed to be simultaneously stressed at an RF potential and RF current equivalent to 1 kW, but the....
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The metal locator uses a one-transistor oscillator and an AM radio to detect metal. Transistor Ql is a pnp transistor that is connected to an oscillator. Resistor Rl provides the correct base bias and capacitors C3 and 04 and the search coil determine the....
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Fan power equipment traditional control methods is through manual or relay control, there is the problem of poor reliability and flexibility. For example, the motor capacity at..
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Laser Design an efficient reciever/collector that could withstand a beam hitting it (maybe an enormous photomultiplier array ), and use a beam mode and wavelength that isn`t easily attenuated. And in that case you`d go for the explosive bursts of option 1.....
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AF modulating signal is applied to gates of matched FETs in push-pull through T1 having accurately center-tapped secondary, and RF carrier is applied to sources in parallel through C3. Carrier is canceled in output circuit, leaving two sidebands. R3 is....
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This is the over-temperature alarm and a cooling by the CD4011 four NAND gate integrated circuits, and for monitoring the temperature of the oven used. When the thermostat circuit failure or power outage, the inside temperature is above or below the allowed..
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I needed a couple of AA batteries and found the display at the supermarket where they were all arrayed. Normally when I`m shopping in the supermarket, I tend to look at the price/kg or price/l when comparing similar products. In the case of the batteries,....
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A complete description is given upon generation of required frequency by using phase shift method along with the advantages and limitation against Wien`s bridge method of oscillations. Complete circuitry of phase shift oscillator is illustrated to describe....
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This circuit uses the HgCdTe demodulation device which can be cooled to 77K in liquid nitrogen. It uses a constant current bias for the demodulation device which is connected to the input port. The voltage`s amplification factor is 200 and the bandwidth is....
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This circuit generates simultaneously, a triangle and a square waveform. It is self starting and has no latch up problems. IC1 is an integrator with a slew rate determined by CT and RT and IC2 is a Schmitt trigger. The output of IC1 ramps up and down between....
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For back-lit LCD displays, this supply will drive a lamp. LT1072 drives Ql and Q2, and a sine wave app..
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This audio amplifier circuit is designed to deliver 2W per channel continuous into 8 © loads. The LM1877 is designed to operate with a low number of external components, and still provide flexibility for use in stereo phonographs, tape recorders and AM-FM....
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Close the power switch os, press the start button SB2. KM1 contactor is energized combined self-locking, the main contacts are closed, the autotransformer TM connected between ..