Popular Circuits Page 262
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This circuit is also called as Free Running Oscillator. Because, it doesn`t requires any trigger pulse to get active. Consider the instant at which Vc=+Vsat. Now the capacitor charges exponentially towards +Vsat through R. Automatically, Vd increases and....
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The CA3217E contains all required circuit functions between the video detector and picture-tube RGB driver stages of a color television receiver. The CA3217E decodes the chroma signals and then produces three different color signals that are internally....
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As shown for the low-frequency output 7W power amplifier circuit. The circuit uses a FET input type operational amplifier LF356 integrated as a voltage amplification. The class..
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My daughter wanted a way of measuring static for her science project. While scanning through an old copy of Getting Started in Electronics by Forres....
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The decision to use either AM, narrowband FM Oess than 15kHz), or wideband FM (greater than 30 kHz) depends on the application. For the transmission of music, FM is better because it has greater noise immunity. For speech or other noncritical applications,....
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DCF77 Preamplifier Circuit DiagramA popular project among microcontroller aficionados is to build a radio-controlled clock. Tiny receiver boards are available, with a pre-adjusted ferrite antenna, that receive and demodulate the DCF77 time signal broadcast....
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This is a class AB audio power amplifier using the Hitachi HA13118 module for your Car. Actually not only can be used in your car application but ....
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Yes, both of those transistor types will be suitable. Is the ""sn9304"" a 2N3904? That`s a common type. You`re going to have four LEDs on at a ....
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Adopt and put the intermodal servo preamplifier circuit as shown, the circuit is 115V, 60Hz servo motor amplifier provides a differential output. An op amp inverting connection..
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The above is a stereo amplifier circuit based on IC STK4191 with 2 X 50Watt output power 8 ohm impedance. And besides that you can use some of the IC can also be applied in this series include the STK4101, 4111, 4121, 5131, 4141, 4151, 5161, 4171, 4181, and....
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Function: for driving small UHF TV transmitters, with gain is 7dB and can amplify a signal between 470-860 MHz. Component: Resistor, Capacitor, Transistor, ....
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Small and simple unit, Can be used for Home-Security purpose In this fire alarm circuit, a Thermistor works as the heat sensor. When temperature increases....
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Here is a small device for HAM amateurs, how using powerpole connectors to connect ham gear to unknown power supply with powerpole connector. But you....
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A window comparator formed by two op-amps packaged into IC1 is the heart of the circuit below. With this technique, we can detect precisely and symmetrically....
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Electronic tube amplifier lovers started his art that simple, excellent single-ended Class A circuit should be the first choice. Single-ended Class A tube amp with a mellow, sw..
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VOX is a switch ordered by voice, often used at microphones instead of the classic switch button. The vox described here may be connected to almost any type of audio equipment which has an external speaker for coupling. The threshold action is set with....
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The HS-3182 is a monolithic dielectrically isolated bipolar differential line driver designed to meet the specifications of ARINC 429. This Device is intended to be used with a companion chip, HS-3282 CMOS ARINC Bus Interface Circuit, which provides the data....
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Using an Atmega8-8PU (configured for 8MHz with external crystal), a Nokia 5110 lcd, and a transistor to handle the pulses from a reed relay. A 3. 3V regulator provides the voltage for the entire circuit. Everything has been mounted on a test board, including....
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This device can`t be legally hooked up to the PSTN as there is all sorts of red tape you need to go through to get the device registered for that. The basic functional blocks of the English ringing converter are pretty simple. It has a ringing detector, a....
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The value of the design lies in the use of IC1, an LM317HVK adjustable s.eries-pass voltage regulator, for broad-range performance remainder supplies voltage-setting and current-limiting functions. The input to ICI-comes from the output of BR1, which is....
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This stun gun is powered by a 9V battery. The transformer steps up the voltage to about 1800V (but with very low current). A 555 timer IC is used to generate a high-frequency output. A 1 MEG variable resistor can also be used at the output to drop the....
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Normally, home appliances are controlled by means of switches, sensors, etc. However, physical contact with switches may be dangerous if there is any shorting. The circuit described here requires no physical contact for operating the appliance. You just need....
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MP3302 is a boost converter IC specifically designed for LED drive applications. The MP3302 can drive 27 LEDs (9 strings of 3 white LEDs in series) from a Lithium ion battery. The IC has internal power MOSFETs for driving the LEDs and has an efficiency of....
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One of the most unfortunate features of the usual portable Geiger counter is the short life of the expensive high-voltage batteries..
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This tutorial looks at the tools needed to start development (C programming) on 8-bit AVR microcontrollers and shows how to write a C program and load it to an AVR microcontroller. An ATtiny2313 microcontroller breadboard circuit will be used as the test....
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Bus Pirate is a great tool for exploring new chips using your PC, without the need to integrate the chip into a MCU project. Once I received my unit, i decided to put it to the test by exploring an accelerometer with I2C/SPI interface the MMA7456L from....
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As shown in FIG constituted by ISO102 and INA101 have to eliminate ground loops, and high-end off cold junction compensation thermocouple amplifier. This circuit uses the K-typ..
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This simple alarm timer circuit is made with 4060 which has an integrated oscillator with a good stability with a relatively wide frequency range. In the c....
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Make a Oscillator circuit with a Op Amp and an crystal (7. 68 MHz) Similar to the one in the schematic below, but for a 7. 68 MHz crystal. I have the crystal, various Capacitors, Resistors and a couple of Op Amps. But no digital Logic chips. "LM111 is not an....
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The 555 integrated circuit is a general-purpose timer useful for a variety of functions. In this experiment, we explore its use as an astable multivibrator, or oscillator. Connected to a capacitor and two resistors as shown, it will oscillate freely, driving....
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The Mark III conductivity-temperature-depth (CTD) profiler has been the mainstay of modern physical oceanographic research1. The MKIIIB CTD provides high quality oceanographic data when used by skilled personnel and are frequently re-calibrated. The design....
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The following schematic diagram shows the 12 Volt Car Lamp Dimmer Circuit Design using 555 Timer. This circuit design can be used to dim a standard 25 watt....
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The circuit has been designed for telephone apparatus to indicate an incoming call as it rings using an LED for visual indication. BC550 an NPN general....
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The following circuit shows about L200 Regulator Power Supply Circuit Diagram. Features: used in power supply with voltage and current ....
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The program loaded in the 12F675 device which has no osccal value will force a pulse on GPIO.4 and it will make a loop while increasing the osccal value internally.
GPIO.5 will send the current osccal value used for each pulse sent. Because the device has....
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This device provides three channels of 8 bit pulse-width modulation. Output pulse duty cycle ranges from 0 to 255/256 in 255 steps. DACs may be loaded by the DS interface. DAC values may also be copied into the on-chip EERPOM and then automatically be loaded....
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It is parallel fed because the DC plate current does not flow through the inductor. R3 may be replaced by an RF choke if desired. C3 keeps B+ from appearing across the variable capacitor which is generally a no no. If R1 were not present, C3 might not charge....
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The circuit is two separate 3023 optoisolators driving two separate triacs, each one powering a large 3-phase contactor. One contactor is engaging fine. The other one is rattling badly because it isn`t getting full power to pull in. The top photo shows trace....
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Measuring inductance is important in making your hand-made inductors, especially when you do-it-yourself (DIY) your coil winding. An inductance meter adapter....
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By introducing an extra transmission zero to the stopband of a low-pass filter, a sharp roll-off c..
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Motorcycle Alarm Number 4. This is a simple - easy to build - transistor based motorcycle alarm. It`s designed to work at 12-volts. But - if you change the relay for one...
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The following circuit shows about Three Phase Auto Changer Circuit Diagram. This circuit using the 2N2222 Transistor. Features: transformer with ....
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A method of determining altitude is by the use of barometric pressure; however, it is not done without difficulty. The relationship of pressure vs. altitude is not a linear one, it is actually a fairly complex one, which the army came up with in the 1930`s.....
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This line provides ground to that relay and is N-O when CU is OFF, and is N-C for all other control functions. The Off switch on the CU is "sticky" as I mentioned before. Several questions: 1) Can I substitute AC Delco CU p/n 15-71886 or p/n 15-71932 for p/n....
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AM MC1496 analog multiplier integrated circuit configuration shown in Figure 21-39. Channel two-input, ? pin DC bits are 6V, can be used as a carrier channel two input channels..
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ITU-R 468 is a standard relating to noise measurement, widely used when measuring noise in audio systems. The standard defines a weighting filter curve, together with a quasi-peak rectifier having special characteristics as defined by specified tone-burst....
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Above is a schematic diagram of a type of audio oscillator known as a twin "T" phase shift oscillator. It gets its name from the phase shift network made up of R3, R4 and C3 plus C1, C2 and R2 which shifts the phase of the signal fed back from the collector....
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The article shows a circuit idea which incorporates an innovative way of detecting the minutest of shocks caused by a possible earthquake tremor. The circuit is so sensitive that it is able to detect tremor of 4 on the Richter scale, yet remains unaffected....
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Interesting light for your bicycle. Made of LEDs. Very nice! Low power consumption, circuit diagram, electronics project, 9V, NE555....
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Doppler units are the "weapon of choice" among mobile T-hunters in many parts of the country. They indicate the direction of incoming VHF signals on a circular ring of light-emitting diodes or a digital display. A doppler set updates bearings almost....
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This project is based on USB to serial converter FT232XX chip series. These chips can convert the USB protocol to asynchronous serial protocol. In other words, you can use the chip for convert for example USB1 port to the correspondent serial port. These....
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Many applications require a sinusoidal reference voltage synchronized to the ac line voltage. You cannot derive such a reference voltage directly from the ac line because the waveform of the ac line is distorted because of nonlinear loads connected to the....
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This is a positioning servo drive featuring adjustment of balance, gain, and deadband. In addition to control from a dc signal, mechanical input can be fed into the balance control, or that control could be replaced by a pair of resistance transducers for....
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I was prototyping for the OpenRelief project. Based on a simple ionisation chamber, initial testing used a bank of batteries for the bias power supply and this post details the construction of an inverter to replace these. For details of the detector itself....
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A stereo power amplifier is limited in its output power by two main factors - the impedance of the load and the internal power supply voltage. To obtain more power, one has very limited choices - other than the purchase of a more powerful amp...
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Interested in starting an intro electronics project using a IR sensor and am having a little trouble understand the application circuit given on the datasheet of the circuit. The value of resistor they recommend using is far less then the one I calculate I....
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Using a Quad NAND Gate, the TTL oscillator can use fundamental crystals between 1 and 10 MHz. The sine..
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This lovely circuit is a real gem! Easy to assemble and more sensitive than many commercial devices available....
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This circuit can be built from readily available low-cost components, some of which may even be hiding in your junk-box! The indicated value of 22 for resistor R1 causes an average current of about 65mA through infrared emitter D1. Because the IRED is....
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Some ten days ago I installed an all-linear automatic night light circuit to control the lights inside the living room. Circuit consists of three op amps-two used as voltage followers and a third as a comparator. As the schematic shows, all user adjustable....
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A simple lab-psu using the lm317, based on the first schematic. to prevent damages to my dmm when measuring mA, i`d like to include a switchable current limiter. but i`m not sure if i understand those schematics and how i could integrate it. so here are my....
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Here's a circuit to create a buzzcoil using a standard automotive ignition coil. A 556 dual timer is used to establish the frequency and duty cycle of the coil current. One of the timers is used as an oscillator to generate the 200 Hz rectangular waveform....
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This circuit measures RF voltages beyond 200 MHz and up to about 5 V. The diode should be mounted in a remote probe, close to the probe tip. Sensitivity is excellent and voltages less than 1 V peak can be easily measured..
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This is the basis of electronics telephone sets. You can use it to replace the talking circuit of an old telephone set with new design, better noise rejection and reliability one. Also you can use it to build a telephone set without dial circuit to answer a....
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This amplifier is intended for amplifying low signals from oscillators in the FM band. It does not have frequency regulators with variable capacitors and coils, it has a wide range and moderate power capable of driving several linear amplifiers. The whole....
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EMI from offline switching power supplies typically causes all sorts of problems for power-supply designers. You may need a large EMI filter to meet FCC emission requirements. Switchers for high efficiency produce high-frequency switching noise that can....
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It`s similar to the Atari Punk synth, aka Forrest Mims` stepped tone generator, but uses two triangle wave oscillators that can be combined or used separately. A wave shaper and square wave LFO are used to increase the aural ridiculousness...
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This voltage-tuned Clapp oscillator uses a varactor diode to set its operating frequency. D1 is an NTE614. L1 is about 7/ ’ (MHz) microhenries. With the circuit shown, the frequency range is about 6 to 15 MHz. ..
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I use this power supply for applications that doesn't use too mucho power. It can provide power to circuit that uses less than 100mA without any problem. The disadvantage of this circuit is the danger of an electrical shock, so it cannot be used if the....
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The monolithic quad operational amplifier provides an inexpensive way to increase display capability of a standard oscilloscope. Binary inputs drive the IC op amp; a dual flip-flop divides the scope"s gate output to obtain channel selection signals. All....
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SWR or standing wave ratio is the ratio of the amplitude of a partial standing wave at an antinode (maximum) to the amplitude at an adjacent node (minimum)....
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Uses three transislor stages und Foster-Seeley discriminotor to give audio output of 1 v peak to peak. -D. Bray, Solid State Makes Debut in Big Screen Color Tv, Electronics, 39:8, p 99-105. ..
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This article has two parts. Part I describes a way to determine the effective average impedance of a pair of mono headphones or a speaker using a device called a FILVORA. This is the optimum resistance with which to drive the headphones or speaker to obtain....
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In conventional applications, switching-regulator ICs regulate VQVT by controlling the current through an external inductor. The IC in A, however, driving a diode-capacitor network in place of the inductor, offers comparable performance for small loads. The....
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Using a single-coil latching relay, which latches/resets with opposite polarities. I`ve tested the circuit with dual opposite-biased LEDs too, no light flicker in either direction to indicate a charge/discharge. QuadrupleA Apr 14 `13 at 23:14 Unless there`s....
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A very usefull talk over circuit which you can use in your radio stations, club or anywhere you want to speak over music without any movement of potentiome....
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The basic idea of the project is to make different colored bulbs light at different frequencies of music. The circuit connects to the speaker outputs of your stereo or to the back of your speaker. The music passes through the transformer and the volume....
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The TINAH board shield, a printed circuit-board shield designed and built for Phys253 and first used in 2009 by Engineering Physics students and staff. The shield acts as a buffer for protecting the digital and analog inputs and outputs of the Wiring....
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The installation of an electrical outlet in the refrigerator work light, not only to facilitate the observation of the refrigerator stops, but also increase the beauty of the socket. Circuit is shown. ..
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A very simple class B power amplifier can be designed using TDA8560 audio IC. The TDA8560 amplifier has an internally fixed voltage gain for excellent channel balance. This audio amplifier electronic project will provide a dual 40 watt output power. This....
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An AM modulator for the MW band that will allow hearing the music of a CD or MP3 player during daytime on such radios. This is not a transmitter: the output power is very low (only 10mW) and is intended to be connected to the antenna input of the radio, or....
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Is it (when operated through a spark gap) allways a quarter wave, or a half wave or multiple of a whole wave so that there are 2* n maximums that are achieved. Can someone point out to sources that are related to creating standing waves and the resonance....
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the function of this circuit for detects a sudden shadow falling on the light-sensor and sounds the bleeper when this happens. The light sensor is ....
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The following circuit diagram is the 100 Watt power audio amplifier circuit, build based on power amp chip LM3886. The single chip of IC LM3886 is able to amplify the audio power output up to 68W . In this circuit, the two of LM3886 are para....