Popular Circuits Page 186
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Ford Thunderbird 1997 - Turned blower/fan on for air conditioning heard a snap under instrument panel - no air/blow for a/c, heater or defrost. Checked blade fuse ok. Could my blower switch be bad, or inline fuse or bad resistor You will have to check all....
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The heart of the circuit is a string of 10 white LEDs. These are wired in series and connected to a current-regulated step-up switching power supply circuit. DC powered LED lighting circuits can vary from the trivial, with a single LED and a series resistor,....
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Some months ago a surprise package turned up in my mailbox. Ananonymous donor had sent me threewonderful, old germanium transistors. The2N170 and a pair of 2N107`s (all date-coded December 1956) werestill in theiroriginal plastic tube packaging. Athin....
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20 Watt Car Power Amplifier circuit diagram bases TDA 2005. This TDA 2005 IC was designed specifically in car audio system for power boosting applications. This IC has a protection against short circuit and overheating. In the above circuit use a bridge....
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The input coupling capacitor allows the input signal to pass through to the grid of the tube while preventing the input source from potentially shorting the grid bias to ground. If the grid bias were shorted out, the 6AG7 would overheat and it would be....
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Simple triangle-wave generators have a weakness in that the waveform of their output signal normally cannot be modified. The circuit presented here makes....
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Closing switch S, the power supply positive half cycle, the power by VD1, Rl, VD2 to charge the capacitor C, C at both ends of the electrical pressure gradually increased, but ..
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I would like to convert a TTL square wave into sine wave. The frequency range of the square wave is: 4Hz-60Hz (yes its those evil low frequency experiments that I plant to take over the world with One approach is to filter the square wave with a high order....
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Using two 12-V filament or power transformers, an impromptu isolation transformer can be made for low-power (under 50 W) use in testing or servicing. SOI is an ordinary, duplex ac recept-able. ..
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CRT final video driver amplifier FIG complementary push-pull final video driver amplifier, which is composed of three transistors, VT511 as a driver amplifier, which uses a com..
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The UTC A6966 is designed for 5 LED level meter driver in 9 lead SIP package. It consists of one input Amplifier and five Comparators for LED level indication. By LianShun Electronics Co. , Ltd ..
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Circuit shown in Figure 3-76. It uses two time relay to achieve control. KTi and KTz control the motor running and downtime. ..
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The AD652 Synchronous Voltage-to-Frequency Converter (SVFC) is a powerful building block for precision Analog-to-digital conversion, offering typical nonlinearity of 0. 002% (0. 005% maximum) at a 100 kHz output frequency. The inherent monotonicity of the....
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For my final project, I decided to make a line-follower robot. This micro controller line follower robot is designed to be able to follow a black line on the ground....
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This is a general purpose serial port infrared receiver. With the help of appropriate software (see below) you can control different functions of your pc from a distance. For example you can control your home cinema settings (volume, play, pause, stop etc),....
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When power is first turned on, two of the LEDs are on and the other two remain off until the timing cycle reverses. The LEDs flash in pairs, but by pressing and holding Sl closed until only one of the LEDs is on, and then releasing it, the four LEDs can be....
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In the previous post we discussed a piezo transducer element and learned how to use it with electronic circuits. In this article we will see how a piezo tranducer can be driven or operated using a simple circuit. However the amplification procedure is not by....
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The schematic for this project is a modified version of the CPLD dev board schematic. There are a few new parts added for this project and you can see the completed schematic for this project below. The main parts in the schematic are the CPLD Dev Board,....
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Flight Computer V1. 0: B1 PC Board U1 80C32 microprocessor U2 27C256-12 32Kx8 ROM - 120nS "V2. 1" U3 74HC373 U4 LM340T-5 5v regulator (might be a 7805 part) U5 43256-15 32Kx8 RAM - 150nS U6 74HC00 T1-T4 2N6045 or 2N6044 darlington output transistors Y1 11MHz....
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This small circuit transmitter processes the signs of audio of a table or microphone, and the signs of video of a camera, or still the audio signs and video of a DVD, Video-cassette or even it sweats her video plate has an exit of composed video, you can....
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This 2 channels audio mixer is based on the 2n3904 transistors which forms 2 preamplifiers. The first preamplifier of the audio mixer has a high gain and can be used for microphone input, and the second one can be used to control the input of the audio....
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This time delay relay circuit is built with IC NE/SE555, produced by Intersil which contains a precision timer. Stability to temperature variations is 0.00...
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The circuit was designed to operate a frequency modulation voice transmitter over the FM band 2 frequency range of VHF. Transmitter an electronic device....
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Li-Ion batteries are normally charged with a current
limited constant voltage for a fixed length of time. At the
end of this time period, the voltage must be removed to
prevent internal chemistry changes in the battery. At a
minimum, a timer is needed to....
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It is probably the most stable VFO oscillator known. Vackar configuration is rarely used because of known reason. (The NIH, not-invented-here syndrome). The frequency tuning range is above 2. 5, not observable in any other type of oscillator. The Coupling....
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Many audio mixer circuits have been published here. But I think, this one is the simplest of them. This very simple audio mixer circuit uses only one transistor. The base emitter junction of the transistor is biased by the diodes D1 and D2. The signals to be....
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Level refers to the relative strength of the signal and is measured in decibels. LINE level sources are much-amplified signals over MIC (microphone) level signals. Line level is usually between -10 to +4 dbm in strength while MIC levels are normally -60 dbm.....
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R2 sets the output voltage. The maximum current is determined by the value of R3: the over-current protection circuitry inside the LM723 senses the voltage across R3 and starts shutting the output stage off as soon as this voltage approaches 0.65 V. This way....
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This is a standard digital clock circuit,frequency size 1 Hz or 2 Hz. It can be used in the normal clock circuit. It consists of IC-4060 and IC-4013, the...
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A simple oscillator circuit that varies the duty cycle over a wide range without affecting the frequency. It is a variation of the simple 555 astable oscillator. Initially, I told a reader that there was no standard 555 circuit that could do this, but then....
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This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder`s microphone input, and the recorder`s remote control jack. It senses the voltage in the phone line and begins....
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When digital data is transmitted over long lines (longer than 1 meter), proper transfer is often disturbed by the parasitic effects of ground level shifts and ground loops, as well as by extraneous noise picked up along the way. An optocoupler, such as the....
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Want to add video to your next project? This device uses a PIC16F819 and not much else. Getting 20 characters to a line is possible by using the SPI port to generate video. Neat trick, eh? The character set is limited to upper case and a few punctuation....
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Display tube using a constant current circuit for steady flow tube ..
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I get that the LM723 current sense and current limit pins (2 & 3) see a voltage created by the very low restistance current limiting resistors and that when this voltage reaches a certain value, the IC shuts down or limits the power supply output. How or....
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The Proximity Sensor circuit can be seen below. Three red boxes show the additions to the circuit that we already built in Part 2: Motor Control. The new parts used and seen in the schematic below are the GP2Y0A21YK IR Sensor, Headphone Speaker and some....
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This power supply circuit is highly stabilized that its output voltage will drop only 0.005% even though the load changes from 0 to 100%. Another excellent capability is that the output voltage will change only by 0.01% if the input voltage fluctuates. The....
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Here are the datasheet and the circuit dram of a PC Switching Power Supply using the IC CG8010DX16....
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IC1 generates 150 µSec. pulses at about 80Hz frequency. Q1 acts as a buffer and Q2 inverts the polarity of the pulses and drives the Transformer. The amplitude of the output pulses is set by P1 and approximately displayed by the brightness of LED D1. D2....
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This simple circuit will energize and de-energize a relay at the push of a button. Any type of momentary action push-to-make switch can be used. Pushing the button once - will energize the relay. And pushing it a second time - will de-energize the relay.....
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8 shows a possible digital counter circuit. This circuit uses two ICM7217 integrated chips each control four digital tube. ..
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In photography r a separate flash, triggered by the light of a master flash light, is often required to provide more light, fill-in shadows etc. The sensitivity of this circuit depends on the proximity of the master flash and the value of Rl..
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This very simple and self-powered device was conceived to allow a person to monitor if someone has rung his home door-bell when he was out.
As most door-bells use 12Vac supply, the circuit must be simply connected to the two door-bell-coil leads...
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Transformerless Power Supply Circuit Diagram. Selection of the Dropping capacitor and the circuit design requires some technical knowledge and practical experience to get the desired voltage and current ..
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An electric fence, perimeter protection circuit, designed to run on batteries, and provide configurable pulses of up to 20KV, to protect a tent perimeter against bears or other animals, out in the wild. The device uses two 555 timer circuits to generated a....
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Circuit works: When the water tank level is lower than said point, F., F2 consisting of RS flip-flop, Q output high, relay, pump the water; when the B point dipped into the water, 6 foot F2 becomes a high level, RS flip-flop on hold, the pump continues....
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The FX919A is a CMOS integrated circuit that contains all of the baseband signal processing and Medium Access Control (MAC) protocol functions required for a high performance 4-level FSK Wireless Packet Data Modem. It Interfaces with the modem host processor....
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Differential temperature sensor is used to measure temperature difference in two different area. Here is the schematic diagram of the circuit: Please note....
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Tuning stage of this long wave radio and medium wave radio receiver also serves as active antenna that can be favorably positioned to get the best reception possible. Circuit is completely separate from the receiver, which consists of demodulator that....
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This simple CPO is for those who want to practice Morse Code in a different way, ie with out the morse key. It can be also used as a touch operated door bell. The popular timer IC555 is wired as astable multivibrator. The frequency (tone) can be changed by....
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This Low Dropout Voltage (LDO) solar charge controller uses a simple differential amplifier and series P channel MOSFET linear regulator ”their compatibility seems like a marriage made in heaven. Voltage output is adjustable. It is mainly intended for....
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This is a 5Volt to 12Volt DC-DC step-up (boost) converter circuitry with the intention of is especially ideal pro the USB powered applications. primarily of all a USB harbor has two current supply modes. beforehand detecting the connected device, it food....
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In this project, all we do is hook up the positive side of the battery to the positive lead of the buzzer and the negative side of the battery to the negative lead of the buzzer. The positive lead of the buzzer many of the times is a red color and the....
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The microphone has high sensitivity in the audio range, but in the ultrasonic range, the sensitivity decreases rapidly. The receiver is very sensitive. To prevent overdriving and feedback due to the high sensitivity of the microphone in the audio range, the....
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The purpose is supposedly to account for the fact that human hearing is less sensitive at low and high frequencies than in the upper midrange, and that this variation is dependent upon the sound intensity (SPL). The Fletcher-Munson curve (as it is commonly....
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This 115 Vac, electronic circuit breaker uses the low drive power, low on resistance and fast turn off of the TMOS MTM15N50. The trip point is adjustable, LED fault indication is provided and battery power provides complete circuit isolation. The two....
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The idea for this crystal tester circuit sprung out of the need of testing a large number of oscillator crystals lying unused in a big hobby box. testing the crystals one by one without the appropriate device would have been very slow and a time consuming....
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Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply. IC1a is a fast oscillator, and IC1b a slow oscillator, which are combined through IC1c to emit a high pip-pip-pip warning sound when a gate....
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The op-amp rectifier in Fig 1 operates from a single supply and provides a logic output and an LED that indicate the state of the input voltage. The input-state indications are handy for calibration. Because the circuit operates from a single supply, the....
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High Quality very simple unit, No need for a preamplifier Amplifier parts: P1 = 22K R1 = 1K R2 = 4K7 R3 = 100R R4 = 4K7 R5 = 82K R6 = 10R-1/2W R7 = 22R R8....
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The circuit shows a simple yes/no gas detector. Three 1.5-V D cells are used as a power supply, with SI acting as an on/off switch. The heater is energized directly from the battery, while the electrodes are in series with a 10 k resistor. The voltage across....
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Digital pressure measuring circuit AD7710/7715/7730 multifunction digital sensor signal conditioning ICs. They integrate a digital interface with the control port, a clock gene..
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The block diagram in Figure 1 shows the basic functions
performed by a battery charger IC using this patented
topology*. The LT1511 is a high efficiency 200kHz switching
regulator IC in a step-down configuration suitable for
charging lithium-ion....
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Fiat Punto Wiring Diagram Manual PDF Download...
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This circuit allows an ECG signal to be displayed on an oscilloscope. Opamps IC1a, b and d form an instrumentation amplifier with a gain of 201. IC1c amplifies the common-mode signal by a factor of 31, and supplies this signal to the right leg. The first....
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Using the CA3164A BiMOS control chip consumes less than 15 pA during standby, yet it can provide 100 mA of chopped current to the de-to-de converter during the energy-reservoir charging cycle. The CA3164A drives tbe primary of T1 with symmetrically chopped....
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This is a simple LED flasher using two 2N3904 transistors. Classic astable multivibrator using 2 transistors. Transistor is not critical. Try these: 2N4401, 2N2222, NTE123A, NTE123AP, NTE159, TUP/TUN and those in your junk box, you may find that most of them....
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DC Motor Control Using A Single Switch this simple circuit lets you run a DC motor in clockwise or anti-clockwise direction and stop it using a single switch, pdf file DC motor reversing circuit DC motor reversing circuit, A DC motor reversing circuit using....
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Geralds 1958 Cadillac Eldorado Seville, 1967 Cadillac Deville,1967 Eldorado and 1971 Lincoln Continental Mark III - everything you always wanted to know about these cars ..
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L a few custom IC 66} began to slow music. When the song ends, no electricity flows through the thyristor, the thyristor then cut straight in the light once again shines on the phototransistor Bu [I a mountain. Roundworm parallel Tiao Ping] I XsJ, people....
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Figure 2-78 is SH-841 as the core device made holiday lights controller. By SCR VSl ~ VS4 to drive light string H1 ~ H4 flashes. Manifold operating voltage by AC by VD1-VD4 bri..
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the diagram is a modify square wave inverter circuit diagram, and if you adjust the frequency by adjusting or turning the frequency resistor (VR 47Ok) the inverter output frequency can be strong enough to power a freezer compressor and some other electronics....
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This circuit was designed as an aid in parking the car near the garage wall when backing up. LED D7 illuminates when bumper-wall distance is about 20 cm., D7+D6 illuminate at about 10 cm. and D7+D6+D5 at about 6 cm. In this manner you are alerted when....
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Digital display temperature detection circuit Precision digital display shows the temperature detection control circuit, MC1403 pin output reference voltage, the potentiometer ..
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This circuit will synthesize two rear channels for quadraphonic sound when fed with a stereo signal. The rear output for the left channel, is a combination of the left channel input 180 out of phase, added to a proportion of the right hand channel (also out....
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The circuit below consists of two `twin-T` oscillators set to a point below oscillation. To set the circuit into oscillation, we can touch the Touch Pad. Here ...
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One is in good shape, made in 1979, and capable of producing sine, triangle and square waveforms. This one is retained and used as main function generator for testing purposes at my main office location. Other three were not working, or working sporadically.....
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This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared light which is invisible to the human eye. The buzzer at the output of the receiver is activated when the....
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You can use them to protect your motorcycle but have many more applications. If you use relays with 6-volt coils - they`ll protect your "Classic Bike". Both alarms are very small. The completed boards occupy about half a cubic-inch - 8 cc. The standby....
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This circuit is 6-band graphic equalizer, you can adjust the sound of low, medium and higher than the IC op amp circuit used 741. With this circuit you can control and mix of frequencies and tones to your liking. Audiblefrequency spectrum is covered in six....
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It is sometimes necessary to retrieve data at power-up in the same way that they were at the last power-down, so that the product wakes up in the state it had before shutdown or to retrieve some measurement. One approach is to save critical variables into....
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Installing LED strips in car`s tail lamps to convert it from conventional bulbs to LEDs. This is the product I`m planning on working with and I need a length of 16", 15" and 14" to make then look correct in my housings. When I did the math the 19. 7" strips....
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The optimum duty cycle and frequency for the strobe photoperiod needs to be determined. In other words we`re flying blind in regard to optimum frequency and duty cycle. The circuit I designed is 3Hz with a 50% duty cycle. I chose this frequency based upon....
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Tape isolate single-phase PFC that DC/ DC vary make up, make up two cable, PFC of three-phase, that single-phase PFC make up in parallel directly in Ausgang by three single-phase PFC in parallel respectively by three The road is formed by matrix type DC/ DC....
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The 0-to 130-V voltmeter and neon "AC PWR" lamp provide an average indication of the ac power. The fuse and metal oxide varistor(MOV)protect the monitor against overvoltage spikes. Four 1N4004 diodes rectify the ac voltage, generating negative-going pulses....
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This 860 MHz Phase Locked Loop (PLL) oscillator circuit is for 1200 MHz transverter`s local oscillator with 435MHz rigs. The oscillator circuit uses PLL synthesizer IC`s of Toshiba for PLL circuit. TC9122P is easy to use preset counter for determining....
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Description:The following circuit shows about GPS Receiver RF Block Diagram. This circuit based on the MAX2742 IC. Features: a complete GPS receiver, GPS ....
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This is a switching circuit that provide latching mechanism to make a set of radio buttons using push buttons. This circuit consist of interlocking circuit....
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For the wiring of the display we first of all take the ribbon cable and solder it according to the following circuit diagram on the 25 pin sub-d (parallel port) plug, whereby in my small circuit diagram I described the rear side - consequently the solder....