Popular Circuits Page 24
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Electronics motor control is a simple circuit made without IC.electronics control of AC motor.circuit diagram with description of electronics motor controller...
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The YD9088 is a bipolar integrated circuit for use in mono portable and pocket Radios It is used when a minimum of peripheral components (of small dimensions and low costs) is important. The circuit contains a frequency-locked-loop (FLL) system with an....
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Seven-V narrow pulses from 2 Hz to 50 kHz are produced by this circuit. CI through C4 provide frequency ranges i..
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As shown is composed of 555 motor automatic governor circuit. The circuit composed of flip-flops 555 and a switch tube. R7 and motor in series to form a sampling circuit. RP1 c..
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Here the 50W inverter circuit build based power MOSFET FQB45N03 and IC TL494. This inverter will convert 12-14V DC input from car battery, become 220V AC output with 50Hz sine wave frequency. The main oscillator, a voltage reference and comparator collected....
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The following page outlines detail information and schematic of the 1985 Pontiac Fiero Wiring Diagram and Electrical System. The electrical system consists of:..
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Here is a White LED Lamp that turns on when the telephone rings. The cool white light helps to locate the phone in darkness and also helps to note the mess....
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The MOSFETS we are dealing with are three terminal devices which are used to control electron flow in a circuit. Two of the pins (the source and drain) pass the current, and the third pin (the gate) is used to control the current. The control of current, as....
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Although you can obtain universal, resistor-programmable switched -capacitor filters that are configurable as notch filters, most cannot operate at bandwidths higher than 100 kHz. Further, the typically 16- to 20-pin packages do not include a continuous....
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A very simple 12v battery charger circuit can be designed using a TIP3055 power transistor to limit the current to the battery by turning off when the battery voltage reaches approx 14v or if the current rises above 2 amp. This battery charger electronic....
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The circuit was taken from one of the old elektor electronics magazine and it is indeed a very cute little circuit which may be used for creating high intensity lighting effects during festivals, parties and fun gatherings. Diodes D1 and D2 along with the....
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The LAS3905 series voltage regulators are ICs that contain all elements necessary for linear regulation (safe-area protection, thermal overload, and current limiting, as shown in Fig. 7-50C). Figure 7-50B shows the output voltage and tolerance for the....
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This sensitive FM radio tuner is the right circuit for hobbyists who want to build their own tuners instead of buying a ""plug-n-play"" finished product. The....
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Color TV chroma processor with ACC, color killer, and an injection lock reference system. fypical power supply voltage is 9 to 11. 5 volts. Hue control range is 100 degrees. The oscillator output signal is 180 mV PMS (courtesy GTE Sylvania Incorporated). ..
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Like so many others, we found a nice 1.8"" TFT display in China, and we decided to make a breakout for it. Instead of just breaking out the pins, and perhaps adding the micro SD card holder, we equipped our version with an USB enabled microcontroller and a....
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A 27MHz transmitter circuit schematic with MC2833 and 2 FET transistors MPF6660. Using a Motorola MC2833 one-chip FM transmitter, a few support components....
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This circuit is the opposite of Repeating Timer No.3. Its operation can be limited to the hours of darkness. Again - the variable resistor (preset) lets you choose the level of darkness at which the timer will begin to function....
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In the circuit, U1 amplifies the audio picked up by the condenser microphone. Resistor Rl limits current, while R2 and R3 center the output of the amplifier to %B+ to allow a single-ended supply to be used. Diodes D1 and D2 rectify the output of Ul, and C3....
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This kit provides a variable output power supply ranging from 1.2 to 15 V @ 3 A. It uses Low Dropout Positive Regulator LM1084 in TO220 package for delivering variable output voltage. Input - 18 VAC/DC. Output - variable output from 1.2 ~ 15 V @ 3 A....
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Once you have built it, Set the frequency as desired using the "Frequency Control". Than using an Oscilloscope you can adjust for best waveform using the "Clip Control". Due to the Sharp Rise and Fall times of Square Waves, they try to make a speaker cone go....
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Most Atmel AVR microcontrollers can be programmed via their in-built serial programming interfaces (SPI). This method is ideal for in-situ programming, such as might be used in manufacturing or for firmware development or field upgrades. In this scenario,....
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It took sometime to develop this interface for Echolink. It uses PIC16F84A and accepts external DTMF from Radio. My Latest Version Foxecho-k7 provides total isolation between Rig And PC and has AGC on received audio. Delay on this project was in part of....
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80kW resistance to salt bath furnace controlled circuit. Salt bath resistance furnace is a big power device, the circuit using fast start, temperature-controlled technology, ca..
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The transformer is a 600:600 ohms transformer (also named 1:1 ratio 600 ohm transformer) : more or less the same number of turns on both primary and secondary coils, and optimized to work at 600 ohms load. Selectronic sells one here. I measured the primary....
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Interface an LED with AVR (ATMega16). Here I am using only one AVR microcontroller ATMega16, one register(10K), one capacitor(16uF/25v), One push button switch, Led BAR Green in stead of 8 led`s, power supply of +5v and -5v. Make the circuit as in diagram.....
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by the pulse generating circuit monitor signal monostable flip-flops Monitoring by the pulse signal constituting the single-shot generating circuit Pulse generating circuit..
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Linear Technologys LT®3466 is a dual step-up converter
capable of driving up to 20 white LEDs with a programmable
constant current. The device is also capable of
driving asymmetric LED strings with independent dimming
and shutdown control for multipanel....
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This circuit give low level output, when exist enough lighting, that is a detector of light. It can give, say ,command turn on somebodies lights, when fall the dark. His exit is compatible with TTL level and it give low logic level, when phototransistor Q1,....
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This PIC16F877 microcontroller tutorial answers the question, "" How to implement a controllable digital clock using PIC16F877 ? "" Using PIC16 simulator (Pr....
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The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated together with 4 digits from a keypad so that as the keys....
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This circuit requires low noise, low and stable offset voltages, high open loop gain, and high speed. These requirements are met by the HA514 7. The standard variations of this circuit can easily be implemented using the HA-5147. For example, hysteresis....
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The following circuit shows about Sensor Circuit Diagram Of Automatic Room Lights. This circuit based on the CD4017 IC. . Features: uses two LDRs, ....
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We`ve called it the Itsy Bitsy USB Lamp. It is such a delightfully simple idea we`re wondering why no-one ever thought of it before. It started life (and continues) as a student project at Massey University in Wellington, New Zealand - and in fact was....
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At dawn, the light is irradiated onto the photosensitive resistor RL, it reduces resistance This switch ICs (2) exhibits high electrical foot. I. lC end, the relay K does not s..
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FIG switching solenoid driver circuit, wherein the device chip U8 is 74123, the device is a solid state relays 02, 03, the switching electromagnet coil is sucked PUSH coil, HOL..
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The program makes use of the built-in AD converter of the PIC16F874 for sensing the touch buttons. The PIC has 8 AD ports, seven are used for the 7 touch-buttons, 1 is used for the light measurement. In order to receive DCF signals, you have to add a DCF....
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The power line fluctuations and cut-offs cause damages to electrical appliances connected to the line. It is more serious in the case of domestic appliances like fridge and air conditioners. If a fridge is operated on low voltage, excessive current flows....
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Louder music, sirens or speech in response to higher ambient noise levels? This simple circuit has the answer, and it may enable your robot to be at least....
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This is a simple and low cost 60W power amplifier. The optimal supply voltage is around 50V, but this amp can work from 30 to 60V. The maximum input voltage is around 0.8 - 1V. As you can see, in this design the components have a big tolerance, so you can....
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The circuit is based on asynchronous decade counter 7490(IC2), a 7 segment display (D1), and a seven segment decoder/driver IC 7446 (IC1).The seven segment display consists of 7 LEDs labelled a through g. By forward biasing different LEDs, we can display the....
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This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, however that this circuit is NOT a metal detector, but will detect metal wiring if it conducting ac....
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I have a NOS lathe with NO history. Period. I think it was maybe purpose-built. In any case, I mention it because there is really no "tech-support....
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This is a novel flasher circuit using a single driver transistor that takes its flash-rate from a flashing LED. The flasher in the photo is 3mm. An ordinary LED will not work. The flash rate cannot be altered by the brightness of the high-bright white LED....
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Real time controller is a device used to exercise control over household device continuously ongoing and scheduled. The series of Real Time Controllers with microcontroller AT89C2051 which dituls in this article is a tool that can do that serve targeted. The....
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The circuit below illustrates generating a single positive pulse which is delayed relative to the trigger input time. The circuit is similar to the one above but employs two stages so that both the pulse width and delay can be controlled. When the button is....
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These devices are low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage (BI-FET II technology). They require low supply current yet maintain a large gain band width product and fast slew rate. In....
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It`s most useful application is as a Signal Injector for radios and TV`s. A square wave is the most suitable for testing the IF (Intermediate Frequency) strip as the signal will pass through the IF transformers without any attenuation, no matter what the....
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A design example for a portable data acquisition system is offered that greatly simplifies the circuit design task....
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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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This circuit uses a couple of Op-amps to produce an interesting sound effect. The left hand CA741 is wired as a standard astable and produces the timing pulses, controlled by C1, R2 and VR1. The output is fed via C2 to the second op-amp and is also direct....
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This is a spectacular but completely useless project. It lights Ultra-Bright LEDs in a sequence and each LED flashes brightly very briefly. The LEDs light-up going around and around since they are mounted in a circle (on a CD), then they pause before chasing....
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A schematic diagram of a fast pulse detector is show in the figure below. Error detection rate under 10% can be expected for 60 ns pulse. To get error free....
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This is higher input or output for L200 voltage regulator circuit. This circuit is designed to solve the problem that occurs when the input or output voltages are higher than the device can produce. This circuit uses the external components. Here is the....
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The only adjustments that require close attention are input, output, and neutralization. The 150-pF capacitor in the input line compensates for impedance mismatch. You tune for maximum signal transfer from exiter to final with an in-line meter or external....
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The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be very precise and tolerant of voltage transients. These IC`s are easily damaged by short voltage spikes. A fuse will blow when its current rating is exceeded, but....
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Overcome a major drawback of the SPI bus. But to explain this, allow me to go on a little detour first. The I2C bus is an extremely convenient design, because it only needs 4 wires to connect several chips together: Each chip sees the same information, but....
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The Mainline ST-5 was originally Introduced in the RTTY JOURNAL in May, 1970. It has rapidly become one of the most popular demodulators for RTTY. As back issues have been un available for some time, the original article is being reprinted. For those....
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1/0 defined PLC Table. Its input signal path 13, including: 1 motor starter button. 2, 3, 5, 7, 8, 9 station photoelectric switch normally open contact, move the CD machine 37 ..
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This circuit diagram shows how to obtain a negative voltage from a positive voltage supply. Another advantage of this circuit is that, the negative voltage together with the original positive supply can be used to simulate a dual supply. The circuit is based....
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This paper describes the process by which a control circuit for a stepper-motor was designed. Due to the nature of the stepper motor, the control circuit had to be a state machine that cycled through four output states based on two input conditions....
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About telephone tapping. TSCM bug sweeps telephone, computer data lines, and bug sweep offices to free them of electronic eavesdropping and wiretaps....
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All modern IR remote control devices produce a continuous coded stream of pulses at 37. 9 kHz when any button on the module is pressed. These IR pulses are detected and decoded by a receiver (your TV, VCR etc. ) and the appropriate function activated. In our....
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FSK or Frequency-Shift Keying is a form of frequency modulation in which the modulating signal shifts the output freq. between predetermined values. If problems arise in demodulating FSK signals, it is helpful to use the FSK filter circuit....
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The circuit on the right uses three bipolar transistors to accomplish the same result with the touch contact referenced to the negative or ground end of the supply. Since the base of a bipolar transistor draws current and the current gain is usually less....
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One thing your not suppose to do to an old radio or TV that hasn`t been run for many years is just go and plug the thing in and flip the power switch on. The best thing to do is use a device called a Variac which allows you to slowly bring up the power to a....
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The PhoneAxe is an original design by the author of a passive filter network built into a 1/4" phone plug/coaxial cable, and is designed to allow electric-guitar matching to the magnetic-phonograph input on common hi-fi amplifiers. Most guitar amplifiers....
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Air compressor (compressor) is commonly used in electrical equipment factory, generally controlled by the electrical contacts. Circuit shown in Figure 5-1. Circuit automatic an..
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The pre-distortion circuit described here is extremely simple (Figure 1) and only requires one trimmer adjustment, though you`ll need an accurate way to measure THD in order to achieve the best results. A dedicated distortion analyzer to help you adjust the....
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It is the essential continuity of circuits Sel 8 Sources and Up/Down Sel 8 Sources, but can work and autonomously, collaborating with any suitable circuit of control. The Relay 1-8 can be 6-24v DC. For current of collector of transistors Q1-8, bigger the 10....
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On the Uno boards, there`s an IC which is responsible as a USB to serial converter and it makes it possible to program the Arduino and also communicate with it from the computer. The problem here is the IC is an SMD (Surface Mounted Device). The R3 uses an....
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We can use NE556 timer IC to make indication of static of terminal in digital logic audible.? Audible logic probe can be very useful when we have to visually...
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The Photodiode current-to-voltage converter circuit uses three CA3130 BiMOS op amps in an application sensitive to sub-picoampere input currents. The circuit provides a ground-referenced output voltage proportional to input current flowing through the....
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Circuit as shown by the triggering device, monostable delay circuit, the alarm sound generator, audio amplifier circuit, light control circuit, partially blocking the preset ci..
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Although theIR region is free from radio interference, it is subject to interference from incandescent lamps, fluorescent lamps, stray reflections, and other sources. A simple way to overcome that problem is to create a carrier by chopping the IR radiation....
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Here is a very simple circuit that can be used for testing Zener diodes. The IC1 NE555 is wired as an astable multivibrator and the output of the IC is stepped up to a high voltage AC using the transformer T1. The unloaded AC voltage will be around 120V. The....
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The following circuit shows about Touch Switch Circuit Diagram . This circuit based on the CD4011 IC. Features: R1 and R2, the logic gates of the ....
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In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply. The transformer should have a primary rating of 240/220 volts for europe, or 120 volts for North America. The centre tapped secondary coil should be rated....
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The circuit of Figure 1 provides the termination voltage for both 1.8 and 2.5V memory systems and delivers output current as high as 6A. IC1 includes a step-down controller and two linear-regulator controllers and operates with input voltages of 4.5 to 28V...
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This instructable is a guide for setting up an automated gardening system using an arduino and other cheap electronic parts. It allows sustainable gardeningby using sensors to determinesoil moisture, as well as a webscraper to determinefuture weather. It....
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When this car alarm circuit is activated it stays activated for 80 seconds. It has 15 seconds delay for the driver to enter and deactivate. and All timmings can be altered easilly.....
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The output cable from my 20 MHz function/sweep generator dangled over the side of the workbench, the alligator clip hovering over the floor. Deeply engrossed in a project, I moved the power strip on the floor a little closer so I could plug in the circuit....
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Circuit schematic for the classic PIC serial programming cable. There is also a high resolution version of the image, and a Scalable Vector Graphics source file for printing. Please note that the SVG file might not display properly in some browsers.....
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Used a coil of about 1mH for both sides. Since my chosen frequency was 125 KHz, my capacitor should be 1. 62nF according to the following equation; I picked 1n5 standard value. L1 is driven via a low-impedance 125 KHz oscillator, can be a sine or a square....
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FET having a high input impedance, the noise figure is small, anti-crosstalk, good mutual interference term performance, etc., in the electronic circuits used more and more wid..
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The circuit is placed parallel with the exit of power amplifier and us gives the level of signal ,from output. Changing resistance R1, in the input circuit, we adapt the indication of power, in the resistance of loudspeaker, that we use....
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The I2C (Inter-IC) bus is a bi-directional two-wire serial bus that provides a communication link between integrated circuits (ICs). I2C is a synchronous protocol that allows a master device to initiate communication with a slave device. Data is exchanged....
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Introduction Humidity is the amount of water vapor in the air, expressed as a percentage of the maximum amount that the air could hold at the given temperature....
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Tube amplifiers designed for headphones have the principal property that they can be used as preamplifiers too. In most cases, the output impedance of a tube headphone amplifier is (or should be) less than the output impedance of a tube preamp. This....
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A Touch On/Off Switch is desired, this circuit fills the bill. Two sensitive gate SCRs are interconnected, so that when one of the devices is turned on, the other (if on) is forced off. That toggling effect gives an on/off circuit condition for each of the....