Popular Circuits Page 71
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LT3755 in the LED string high side sensing output current, high-side current sensing is used to drive the LED's most flexible program, PWM input provides up to 3000: 1 dimming ratio,..
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The circuit uses a thermistor and three sections of a LM3900 quad op amp IC. When the temperature drops to 36°F the LED indicator flashes about once each second. The flashing rate increases as temperature drops to 32°F when the LED remains on. Amplifier I....
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This Instructable covers the assembly of a circuit capable of PWM-ing ( pulse width modulating ) a high-power RGB LED strip and programming an Arduino to cycle through a range of colors. In this context, high power is 9-12 volts. I will discuss how to....
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KIA6924S is designed for muting the popping sound made at power of ON-OFF receivers, pre-amplifiers, main Amplifiers and other electric Audio equipment as well as the noise made at changeover of switches. By Korea Electronics (KEC) ..
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This timer was designed mainly to switch off a portable radio after some time: in this way, one can fall asleep on the sand or on a hammock, resting assured that the receiver will switch off automatically after some time, saving battery costs. R1 and C1....
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I currently have three: a really old optoelectronics Opto-7000 which I don`t use much, a newer Mitronics MIC-1028, and my most recent acquisition, a used Tektronics 2236 `scope purchased at Dayton 2009, which has a very handy frequency counter built-in. I....
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This compact metronome will run for years on a single nine-volt transistor battery. Has both tone and pulse rate controls, and uses touch plates to start and stop, can be built in a case no larger than a pack of cigarettes. The touch plates consist of two....
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The non-sinusoidal waveform generators are also called relaxation oscillators. The op-amp relaxation oscillator shown in figure is a square wave generator. In general, square waves are relatively easy to produce. Like the UJT relaxation oscillator, the....
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The Atmel Flash devices are ideal for developing, since they can be reprogrammed easy and fast. If you need more code space for your application, particularly for developing 89Cxx projects with C language. Atmel offers a broad range of microcontrollers based....
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Darkroom time exposure of the second circuit It uses 555 IC A for the timing circuits. KA by the relay contacts to the control system of the exposure light source. Adjustment p..
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Signals with a know frequency but unknown phase may be detected using an in-phase and a 90 ° shifted reference signal, as frequently used in lock-in amplifiers, synchronous detectors, and frequency-response analyzers. The 90 °-shifted signal is called the....
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Grid driven tetrodes like 6146, 807, or 4CX250`s have high power gain. High gain systems require very little feedback to become unstable, so they are generally neutralized. The also often require some form of grid loading resistor to reduce or stabilize....
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20W Bridge Audio Amplifier kit, based on the TDA2005 IC, a class B dual audio amplifier, specifically designed for car radio applications etc...
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Many electric cars are able to convert the momentum of the car into stored energy in batteries, rather than convert it to useless heat at the brake pads. How does this work How can I implement it myself Probably you already have it, and just didn`t know it.....
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Had noticed balls getting stuck in the ball trough, not loading into an upkicker or not sitting directly on trough ball microswitches/optos, causing the machine to think a ball was missing. My first thoughts were that the ball trough itself had become....
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Using the UPC1651 FM monolithic circuit can be designed a very simple low cost FM transmitter electronic project. This UPC1651 FM transmitter circuit is specially designed as a wide band amplifier covering the HF band trough UHF band. Audio signal from the....
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The "recovery node" is the pyrotechnic controller board designed for LV2. LV2 uses two different parachutes during its descent. The drogue chute opens first. The drouge is a small parachute that stabilizes the rocket but allows it to fall at a fairly high....
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The LT3473/LT3473A are micropower step-up DC/DC converters with integrated Schottky diode and output disconnect circuitry in low profile DFN packages. The small package size, high level of integration and the use of tiny SMT components yield a solution size....
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Build a reprogrammable cartridge. Many things can be done with such a cartridge: You can develop your own applications or games and try them on real hardware instead of using an emulator. If you`d like to get into genesis development, I think the genesis....
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The audio power amplifier 80W audio delivery to 8 loads. LM3875 IC device should be properly cooling. Note that for the bridge amplifier circuit, its two speakers will generate heat...
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Regulating ~12V from the car battery to 5V used by Atmel AVR microcontroller. Why are there two capacitors on each side of linear regulator LM7805 This answer to another question might be the answer I`m looking for, but I`m not sure about it. If this answer....
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Interface the LCD with 8051 microcontroller at89s52. But whenever I power up the microcontroller, LCD is lit but only black boxes are showing. I have tried many different codes and many things, but display is same. onle black boxes. But i have simulated this....
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If a transistor junction operating in Zener breakdown is used as a noise source, the amplitude of the noise signal is asymmetric. This problem can be solved by using two transistors as two independent noise sources. One of these has a series resistor to....
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The industrial fuel oil furnace controller circuit is composed of the power supply circuit, testing and ignition control circuit and control implementation circuit, and it is shown as the chart. The power supply circuit is composed of the step-down capacitor....
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Infrared light reflected off a finger is used to activate this switch circuit..
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First of all, download any version of arduino software ( new version is better) using the link given above and then download the provided arduino sketches. Once download is complete, open the sketches and you will be able to see the written codes. Complete....
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The 60 Watt linear amplifier is simple all solid state circuit using power mosfet IRF840. The IRF series of power transistors are available in various voltage and power ratings. A single IRF840 can handle maximum power output of 125 watts. Since these....
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H ere is a circuit of an off-line telephone tester which does not require any telephone line for testing a telephone instrument. The circuit is so simple that it can be easily assembled even by a novice having very little knowledge of electronics. A....
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Locator uses a transistor radio as the de-tector. With the radio tuned to a weak station, adjust Cl so the locator oscillator beats against the received signal. When the search head pas¬ses over metal, the inductance of LI changes thereby changing the....
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Asia ultrasonic remote control switch This example describes using gas pressure bisulfite ultrasound flute (made of rubber, there are olive and flat round) control. When using ..
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1. THE INPUT CLOCK frequency fed into this circuit is divided by 2n-l. The circuit consists of clocked flip-..
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This circuit can be primarily used for charging 12V Ni-Cd battery packs. Any way 6V and 9V battery packs can be also charged by using this circuit a little....
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I've seen an NE592 used as a video buffer amp at the end of a 75 ohm line. Used so that the 75 ohm line could drive all kinds of neat processing stuff without affecting the signal (that's what a buffer is after all, right?) Now National Semiconductor makes....
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Tug Of War is a game that I made on an FPGA. The digital circuit was created using Verilog. It is a FSM (Finite State Machine)...
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This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag by means of a tiny cord. If the bag is snatched....
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To complement the 60 Watt MosFet Audio Amplifier a High Quality Preamplifier design was necessary. A discrete components topology, using + and - 24V supply rails was chosen, keeping the transistor count to the minimum, but still allowing low noise, very low....
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Some circuits need a negative supply voltage that only has to supply a small current. Providing a separate transformer winding for this (possibly even with a rectifier and filter capacitor) would be a rather extravagant solution. It can also be done using a....
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The IR detector (IC3) controls an LM 7555 CMOS timer (IC2) which operates in mono stable mode. When the beam is broken, IC2 is triggered and its pin 3 output goes high for about half a second. This extinguishes LED1 and turns on transistor Q1 to drive a 5V....
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As shown, the circuit uses type J RTD, its resistance value corresponds to the temperature of the RTD can check a form provided by the manufacturer, with 20 zero adjustment pot..
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Circuit inductive burglar alarm circuit from the radio scanning detection circuit, a signal processing circuit and alarm circuit, as shown in Figure 13-43. Radar detected by th..
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This circuit uses a dc amplifier (324) in a bar-graph circuit that uses an LM339 Quad comparator IC to sense dc levels. ..
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For the last year I`ve been working on a prototype for a Solar Inverter that can be Grid Intertied. A solar inverter takes the 12V DC (or other voltages) from...
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This example demonstrates how to stack up layers and design transmission lines for a high-speed digital PCB. The example also demonstrates how to create a moated ground area with a bridge around a high-frequency crystal oscillator, how to perform pin/gate....
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Better performance is a dynamic expander circuit NE571 and LM1894N thereof. Dynamic Expander to join the Formula circuit consisting of a variable with LM1894N bandpass filter, ..
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The LM39X4 acts as a LED-driving vol-tometer that has its basic maximum and minimum readings determined by the values of R2 and RV2. When correctly adjusted, the unit actually covers the 2 volt to 3 volt range, but it is made to read a supply voltage span of....
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With this circuit you can can check that which dot of the circuit is Positive Volt or Negative Volt which. This cheap circuit uses the a little component is will appropriate apply with an automobile or motorcycle. This circuit works during Voltage between....
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The TEA5764UK is a single chip electronically tuned FM stereo Radio with Radio Data System (RDS) and Radio Broadcast Data System (RBDS) Demodulator and RDS/RBDS decoder for portable application with fully integrated IF selectivity and demodulation. The Radio....
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I recommend breadboarding the entire circuit first. It was way easier on a breadboard that trying to figure out what goes where on a tiny piece of pr....
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An AC millivoltmeter - calibrated in dB - with a range of 30V down to 3mV full scale (80dB range) would be extremely useful. Attach a microphone (electret mic capsules are quite good), and you have a relative sound level meter, even better if you have some....
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A full foot long arc and get to more then 1million volts eventually. I have finally built a REAL Tesla coil that operates via an arc and capacitor combination. Not just a flyback or transformer setup in series. It was not as difficult as I thought it might....
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This metal detectors described in the example can be used to detect metal objects with high permeable magnetic substances. The working principle. The metal detector circuit is composed of the power circuit, sine wave oscillator, PLL phase-locked loop circuit....
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The purpose of this report is to provide background and findings or our senior project. We will discuss four steps that we used to complete our final project. The four steps of our project were research and development, design, construction, and test &....
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TDA8444is the D / A ( digital / analog ) converter IC produced by Philips, and it is used to convert digital signals to analog signals. 1. pin functions and dataTDA8444 IC uses 16-pin double-row package, andpin functions and data are shown in Table 1. 2.....
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As shown in FIG staggering low frequency active filter circuit. This is a fourth-order Butterworth low-pass active filters for filtered VLF random pulse noise voltage DC level ..
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Continued from the previous post. The same priciple is true for the followings, temperature to current transmitter. In this case the input voltage is propotional to the measured temperature, not the rotation. Temperature input, full analog, 2 wire, 4-20 mA....
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This is the cheapest 150 Watt amplifier circuit you can get, I think. Based on two Darlington power transistors TIP 142 and TIP 147, this circuit can deliver a blasting 150 W Rms to a 4 Ohm speaker. Enough for you to get rocked, then try out this. TIP 147....
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I am a beginner/hobyist and would like to learn more about Microcontrollers. All I want to do is receive an output on an LCD when pressing a button on the keypad. ..
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A densitometer is one of the most valuable tools a darkroom enthusiast can employ. Up until recently, however, densitometers were expensive and bulky. Furthermore, densitometers which would talk to your computer and calculate effective film speed, contrast....
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This device is designed to be a simple, inexpensive comparator`, intended for use in a solar cell power supply setup where a quick too low` or just right` voltage indicator is needed. The circuit consists only of one 5V regulator, two transistors, two LEDs,....
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Built servo tester cicuit as shown - only action is for the servo to twitch when power switched on, cannot see any real reason why wont work - ideas anyone I haven`t built this circuit yet so I can`t comment on the circuits efficacy. I do have some....
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Here is the circuit diagram of simple and easy subwoofer filter which will be operated from a 12V DC supply. Such a circuit is incredibly helpful in Car subwoofer applications. The circuit is nothing however a low pass filter whose pass frequency will be....
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This circuit will generate a smaller DC output voltage from a larger DC input voltage.It is quick and simple to make and by changing the value of the zener diode, the circuit can be universally adapted to provide other output voltages.The circuit and all....
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The potensiometer adjust the trigger on` level. The diode in the circuit diagram shows to be 1N914. This is ok if you have a light-duty relay, also the 1N914 is a signal diode so actually does not qualify. Use a 1N4001 (or better) instead. A couple of....
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To get a good voltage swing, the value of R1 must be carefully chosen. If Rsensor = a when no light falls on it and Rsensor = b when light falls on it. The difference in the two potentials is: in presence of light and a very large resistance in absence of....
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This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....
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Hello. I am trying to design an LC Colpitts oscillator. This is the circuit. I came up with this based on the Colpitts oscillator shown on this....
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AVR In System Programmer UK manufactured by Kanda who are a popular choice for AVR In System Programmer UK and AVR In System Programmer worldwide....
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This phone is loud ringing tone circuit for generating the electricity bell in the old telephone. This circuit is relatively loud. so can use to replacement the same ringer or the original telephone may be lost. We do not need a new phone. The detect ringing....
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This is a aerial affection ability accumulation with a continuously capricious stabilised achievement adjustable at any amount amid 0 and 30VDC. The ambit additionally incorporates an cyberbanking achievement accepted limiter that finer controls the....
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This circuit prevents making transmissions that are too long, which "time out" repeaters and/or tie up a communicatio..
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What do you do with an old phone, a microcontroller and lots of time? You hook the old phone`s LCD screen to the computer USB of course...
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Leaving aside the complex chargers, "stuffed" electronics capacitor charger is one of the best connections. Charging current is limited by the resistor (or other element of the changing excess energy into heat), but the reactance of the capacitor to the....
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The power output of most of these circuits are very low because no power amplifier stages were incorporated.
The transmitter circuit described here has an extra RF power amplifier stage, after the oscillator stage, to raise the power output to 200-250....
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This AC Power Monitor continuously watches the AC power line voltage for both under-voltage and missing cycles. When it detects a total of 5 or 6 consecuti....
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The photo depicts a completed (bread-barded) locked anti-phase motor controller using general purpose transistors, which allows you to control small DC motors for robotics applications. The big picture problem is that a normal DC motor controller does not....
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The baby-alert receiver is comprised of three transistors: Q2, which is configured as a high-gain linear amplifier; Q3, which serves as both an amplifier and detector; and Q4. which is essentially used as a switch; and a few additional components...
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The LTC1980 manages both battery charging and
generaton of the regulated system bus voltage via a unique
bidirectional pulse-width modulator design (Figure 3).
When the wall adapter is present, power passes directly to
the system load DC/DC converters....
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Tone control or pre-amplifier is an amplifier circuit supporters. Sometimes some of us do not know where a good amplifier, a raft alone and the results are not much different or even the same. Therefore we must know the character of the advantages and....
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The LT3754 16 channel LED driver with a step-up DC DC controller designed by Linear Technology is capable of driving up to 45V of LEDs. Each channel of the LT3754 led driver contains an accurate current sink with ±2. 8% current matching. ..
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How to connect up some lights so that when the phone rings, they flash. This is very useful in a situation were there is lots of noise and it is impossable to hear the phone, such as a workshop. Here is such a device. The ring detect part of this circuit....
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Geotron, I`ve fried a few mots myself. What kind of bridge do you have leaving it? When I had just a 1kv bridge made from four 6a100`s, I had problems ....
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What`s so special Well, first of all - a very low harmonic distortion. Usually, manufacturers indicate the maximum power of its regular ingenious handicrafts with the harmonic content of 10%. At the same chip, CT at the maximum specified power is only 0, 5%!....
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This wikibook is going to be an introductory text about electric circuits. It will cover some the basics of electric circuit theory, circuit analysis, and will touch on circuit design. This book will serve as a companion reference for a 1st year of an....
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The working and circuit diagram of a two mode night light circuit is given below....
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Flight Computer V1. 0: B1 PC Board U1 80C32 microprocessor U2 27C256-12 32Kx8 ROM - 120nS U3 74HC373 U4 LM340T-5 5v regulator (might be a 7805 part) U5 43C256-15 32Kx8 RAM - 150nS U6 74HC00 T1-T4 2N6045 or 2N6044 darlington output transistors Y1 11MHz....
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The circuit is basically a NE555 monostable, the only major difference being its method of triggering. The trigger input is biased to a high value by the 22 ohm resistor. When the contact plates are touched, the skin resistance of the operator will lower....
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1071 touch is the use of audio enhancement technology being introduced high-resolution two-channel stereo enhancement processing chip production improvement product, it is desi..
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Basic features: O internal containing 512k bit EEPROM, you can always recording, playback at any time, long-term retention after power voice. Voice recording time is 20s. can b..