Popular Circuits Page 94
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If you`re expecting an important visitor but you just have to step out for a moment, an electronic doorbell memory can come in handy so you can see whether someone rang while you were out. Of course, you can`t tell whether it was the visitor you were....
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The overhaul has the following features: online judge diodes, transistors is good or bad; test TTL logic level or a high impedance state; can output 37MHz, bar television signal 74MHz, 148MHz; the output 465kHz, 930kHz, 1395kHz AM signal. As illustrated, 555....
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The following circuit shows a 20Watt Audio Amplifier Circuit Diagram Based On The LM1875 IC. Features: applied in a car, 20Watt audio amplifier, 4 ....
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Flash memory or a flash RAM is a type of nonvolatile semiconductor memory device where stored data exists even when memory device is not electrically powered. It`s an improved version of electrically erasable programmable read-only memory (EEPROM). The....
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Digital integrated circuit enables the answer is greatly simplified. The picture shows four Responder group circuit. ..
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Using ac-line power sources and batteries for remote humidity sensors is undesirable because these sources can be troublesome if you mount them in inaccessible points, such as smokestacks, cold-storage chambers, or darkrooms, where maintenance is difficult....
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Electronic ballasts have a wide operating voltage range, fast start working no noise, no flicker, save energy and so on. It has been more and more people to accept. The circuit..
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Circuit serial coded modulated control signal, amplify, and transmit high voltage isolation. 556 time base circuit and R1, R2, C1 and R3, R4, C2 form two astable multivibrator,..
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Xenon lamp, strobe light circuits, xenon strobe, photo flash, photoflash,schematics or diagrams, all free to use. My inspiration came from a strobe circuit that was in a school fire alarm....
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This is a circuit for RF (radio frequency) transmitter experiment, watt meter is useful for optimizing the transmitter circuit. A simple RF watt meter circuit is shown in the schematic diagram below. Because circuit is not frequency sensitive, calibration is....
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AC mains operated single LED flasher circuit, built using the popular CMOS timer chip TLC555 is shown below. The whole circuit is powered directly by the grid supply of 230VAC through a capacitive potential divider and associated components. This minuscule....
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Robot eyes circuit of Service A simple circuit to simulate a man appointed to It is a dual-lamp working in a manner UNSTEADY Circuit diagram...
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The simplest way to drive stepper motor having lower current rating is using ULN2003. The ULN2003 contains seven darlington transistors. The ULN2003 can pass upto 500mA per channel and has an internal voltage drop of about 1V when on. It also contains....
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I have 1968 Ford and the motor identification is now a 1972 engine. Alternator was gone and I have a new one. Was told that I need to reverse the polarity of voltage regulator to make alternator start charging. A diagram of wiring to both voltage regulator....
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CMOS analog multiplexers were frequently used at the ETC for various purposes. Here I thought I would present a circuit I borrowed from a Dave Jones design, and slightly modified it, to build a black burst generator. Video systems need sync to ensure that....
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This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply.
Especially suited for car or panel pilot lights, this device can drive lamps....
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Neon glow lamps can also be used only for their U/I characteristic and not for producing light. These lamps are electrically very close to diacs: no current can flow through them since the voltage is lower than a trigger value (about 70V for neon glow lamps....
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A very simple 20 watt amp electronic project can be designed using the LM2005 dual high power amplifier, designed to deliver optimum performance and reliability for automotive applications. LM2005 20 watt amp has a high current capability (3. 5A) that....
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Power op amps provide accurate speed control for dc motors. The circuit provides bidirectional speed control. The amplifiers' push-pull configuration ensures a full rail-to-rail voltage swing (minus the output stages' saturation drops) across the motor in....
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This simple circuit uses a 741 op-amp in differential mode as a continuity tester. The voltage difference between the non-inverting and inverting inputs is amplified by the full open loop gain of the op-amp. Ignore the 470k and the 10k control for the....
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The schematic for this project isn`t too, too bad to look at even though it`s not the best drawing/layout for a schematic that I`ve ever done. The basic flow is from left to right. Left side is the state machine, then the 555 timers, then counter circuitry....
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This is a DC motor controller circuit, built using transistor TIP31 based on H-Bridge concept. The switch S1 and S2 are normally open, push to close, press button switches. The LED function is to indicate the direction of motor rotation, you may use any....
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A block diagram symbol is used to represent the PCB schematic on block connection diagrams. The following diagram shows the block diagram and the circuit that it represents. Any number of signal blocks can be connected in series. To be able to show all of....
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Car Mp3 FM transmitter circuit. This circuit can broadcast any audio to FM receiver. It has a good preamplifier circuit so the broadcast sound quality is good....
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Here is a collection of (SMPS) schematic, datasheets, images and tips for switch mode power supplies using TL494/ LM339, KA7500 and IC2003....
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A schematic diagram for the remote analyzer is shown. The circuit is powered from a simple 5-V supply, consisting of PL1, SI, Tl, a bridge rectifier (comprised of D1 through D4), capacitor CI, and a common 5-V regulator, Ul. Switch SI is the on/off control....
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Afshin Izadian at Indiana University has invented a new power inverter that employs just a single switching transistor and generates infinite-level voltages....
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You need to wire 8 Max6675 ics to a microcontroller. You can parallel all the clock inputs. The NCS lines of numbers 1 and 2, 3 and 4 etc can be connected together. The SO lines of all the odd numbered Max6675 can be connected together, as can the even ones.....
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* This meter looked like it works well: YouTube - IndikG tor vybuzenG s LM3915 but the schematic is quite different. Google Translate If I followed that schematic, do you think everything would still work You should use a peak detector circuit at the input....
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Another method of using opamps to regulate a power supply is shown. The power transformer requires an additional winding to supply the op-amps with a bipolar voltage (+/- 8 volts), and the negative voltage is also used to generate a reference voltage below....
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This note will review the process by which VCO (Voltage Controlled Oscillator) designers choose their oscillator`s topology and devices based on performance requirements, components types and DC power requirements. Basic oscillator design specifications....
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This is a Crystal Receiver using 741 IC chip. Frequency range is between 500-1600Khz...
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For those of us that cannot afford the high cost of some of these SDR radios there is hope. Here I describe an I. F. converter suitable for use with Boat Anchors Communications receivers. Now it is possible to couple the great front ends of an R390 or SP600....
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This simple circuit can give regulated 4. 7 volts for charging a mobile phone. USB outlet can give 5 volts DC at 100mA current which is sufficient for the slow charging of mobile phones. Most of the Mobile Phone batteries are rated 3. 6 volts at 1000 to 1300....
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The thermistor RT and R1, R2, R3 and RP1 form a temperature measurement bridge. When temperature is at 20 ?, using R1, R3 and adjusting RP1 can allow bridge to keep balance. When temperature rises, the resistance of the thermistor RT reduces, the bridge in....
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With the equipment ready for operation, the main line switch (S-831), the EMERGENCY SWITCH (S-12) and the main line contactor contacts K-831B all are closed. (1) The keying relay main contacts (K-1C) ground the center tap of the MO filament secondary of T-1....
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This circuit is designed to create an early warning alarm system for any form of theft that are important to the owners of a motorcycle or bicycle. This alarm system can be used a number of normally open switches such as mercury (italics) switch. It works by....
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This circuit given here can be housed in the box containing the speaker to form a handy microphone amplifier. The device can be used by teachers, guides, lecturers etc for speaking in a crowdy or noisy environment. The circuit is designed base on the audio....
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Detects clipping in preamp stages, mixers, amplifiers etc., Single LED display 9V Battery supply unit This circuit was intended to be used as a separate....
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Life in the 21st century would be almost unbearable without some of the computer peripherals that PC users now look on as essentials take for example th....
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This circuit is a double tone Police sound and Single tone old ambulance sound. This circuit is usually installed on a on battery powered cars, motorcycles,....
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Halloween is coming up and it's time to do some pranks. Everyone likes Halloween and I'm no exception. Every year me and my wife decorate the house with lot's of bugs, spider webs, creepy posters and of course lot's of Halloween candy. While making the....
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This is a simple but reliable device based one of the oldest integrated voltage regulators of them all - the LM723....
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The momentary switch used was rated for 10A for safty. If the switch was rated for too small a current, the instantaneous current for the first millisecond would fuse the switch contacts together. To achieve objective 3, some sort of switch that can vary....
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This broadband low-noise CMOS amplifier covers the ultrawideband (UWB) communications frequencies from 3.1 to 10.6 GHz with the aid of current-reuse techniques....
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Electric guitars use coils (guitarists call them pickups or elements) to convert the vibrations of the strings into an electrical signal. Usually, a guitar has more than one element builtin, so that the musician can select with a switch which element or....
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This circuit diagram of digital clock uses six common anode seven segment displays to show the time. It needs neither micro controllers or PIC for it`s operation. It`s a MM5314 IC driven digital clock operating at 50 Hz or 60 Hz, and 12 or 24 hour display....
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Adjustment potentiometer RP, can change the size of the DC output voltage. ..
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This is the 100W DC inverter build based transistored multivibrator as well as transistor signal amplifier. The inverter will convert 12V DC voltage in the input and increase the voltage level to become about 220V AC. 12V car battery is recomended to be used....
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C1 takes the DC decoupled voltage from the Microphone, amplifies this via Q1, C2 decouples it again, then R6 and C3 Low Pass Filter it, but once we get to Q2, Secondly how does this circut actually accomplish frequency modulation: Please use math on me! (I....
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This microphone preamplifier electronic project is based on transistors and is capable of about 70dB or more gain at audio frequencies. Gain of this circuit is approximately equal to the product of the hfe of the both transistors times in the ratio of the....
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As shown in FIG, RTD using Pt100 type thermocouple. When the temperature is 100 ~ 600oC when, XTR105 output current 4 ~ 20mA, RCV420 output voltage of 0 ~ 5V. The figure for th..
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The RT320 and RT321 Clansman HF sets are designed for Upper Side Band (USB) operation only. This conflicts with the Amateur radio convention which is to use LSB on bands below 10MHz. In both radios the IF used for SSB generation is 1. 7500 MHz and there is a....
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These metal detector circuit diagram is based on the TDA0161 monolithic integrated circuit , designed for metallic body detection by detecting the variations in high frequency Eddy current losses. For detecting metals , TDA0161 require an external LC tuned....
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The buck-boost converter is of value where the output and/or input voltages vary to such an extent that on occasions a buck converter is needed, while on other occasions a boost converter is needed. An example (that will be described further in another....
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In these times with viruses and other threats from the Internet it would be nice to have reassurance that the PC cannot be infected. That is why this circuit was designed. It makes it possible to install multiple hard disks inside the case of a PC, which are....
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Human approach detector circuit is composed of integrated operational amplifier, gate circuit and resistor-capacitor unit in the diagram. Among them, 1MHz oscillator consists of reverser T1, 1MHz crystal oscillator and resistor-capacitor unit. The oscillator....
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C4, L form a resonator: resonant frequency is the FM transmitting power of the microphone, according to the parameters of the diagram component transmission frequency can be between 88 ~ 108MHZ, just FM radio receiver covering the frequency by adjusting the....
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The output current issensed across R8, This is delivered to the current-limit arrtplifier through R7, across which the foldback potential is developed by R6 with a threshold determined by D4. The values given limit the peak power below 20 W and shut off the....
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The TRIAC is a three-terminal device similar in construction and operation to the SCR. The TRIAC controls and conducts current flow during both alternations of an ac cycle, instead of only one. The schematic symbols for the SCR and the TRIAC are compared in....
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This circuit is essentially an amplified crystal set. The inductor could be a standard AM radio ferrite rod antenna while the tuning capacitor is a variable plastic dielectric gang, intended for small AM radios. The aerial tuned circuit feeds diode D1 which....
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The circuit is composed of the parts below: (1) infrared emitterThe multi-harmonic oscillator is comoposed of 555 circuit. The oscillation frequency is decided by value of the RP1, R1, C1. The circuit`s oscillation frequency is 38kHz. (2) infrared receiver....
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This is a zine dedicated to electronics circuit diagrams, diy (do it yourself) electronics projects, electrical electronics data sheets, and micro controller projects for hobbyist, students, consultants and product designers...
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Diagram shows the basic construction of a forward converter. Whereas the energy is temporarily stored with the flyback converter before it is transferred to the secondary side, in the forward converter, energy is transferred directly between the primary and....
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The ultimate source of energy is Sun. it is possible to generate current from sunlight using solar panels. These panels convert light energy into electrical energy. A solar panel consisting of a number of solar cells, which will produce a small amount of....
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This circuit will allow you to turn on any piece of equipment that operates on 115 volts ac. The receiver circuit is based on the Radio Shack infrared receiver module (MOD), part number 276-137. It is also available from some of the other sources listed on....
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Digital Step-Km Counter. Max. range: 9,950 meters with two digits. Slip it in pants` pocket for walking and jogging. Circuit diagram: Parts: R1,R3 22K 1/4W...
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Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need. A correct grounding is very important to eliminate hum and ground loops.....
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I have an Xbox 360 console which used to have a problem with the 3RLOD, I decided to remove the stock heatsinks and install a Koolance external water cooling system. This has remedied the fault with the console superbly (the console now operates at a max.....
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This is a voltage multiplier circuit. First circuit is used to double the a square wave (any amplitude). However there is minus about 2v losses in base-emitter....
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The circuit in this figure is protecting the circuit and the system with power supplies that may exceed safe limits. One example is small consumer products that use external ac adapters; its easy to mistakenly plug in the wrong adapter. Another example is a....
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1997 Toyota Camry Fuel Pump Wiring Diagram...
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This article provides a detailed description of our methodology for testing power supplies in three major parts. The first one lists PSU parameters we check out and specifies the test conditions. In the second section you`ll find terms often voiced by PSU....
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This PSU has been especially designed for current-hungry ham radio transceivers. It delivers safely around 20Amps at 13.8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added...
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These days many more audio-visual devices in the home are connected together. This is especially the case with the TV, which may be connected to a DVD player, a hard disk recorder, a surround-sound receiver and often a PC as well. This often creates a....
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This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emitter junctions. It can also check the output power transistors on amplifier circuits. Circuit....
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Tesla coils are air-core, resonant transformers. Working at high frequencies, they can generate tremendous voltages with spectacular lightning-like discharges. The most popular use for them has been in the film industry, where they are used whenever....
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The ISL6291 provides a low-cost integrated charger solution for single-cell Li-ion and Li Polymer rechargeable batteries. No external pass element, current sensing resistor, or reverse blocking diode is required with this solution. The ISL6291 is a....
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PC parallel port can be very useful I/O channel for connecting your own circuits to PC. The PC`s parallel port can be used to perform some very amusing hardware interfacing experiments. The port is very easy to use when you first understand some basic....
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This page has links to various projects and items of interest for the RoboticsArt Studio class projects....
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Assume first that SCR1 is on and SCR2 is off so that CI is fully charged, with its LMP2 end positive. The..
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PIR (Passive Infrared Radial) Sensor Based Security System, circuit diagram,working,applications....
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The receiver is composed of several subassemblies: an active antenna, an amplifier (with a regeneration control and band-switching circuitry), an AM detector, a power amplifier, and some form of output device (internal speaker, external speaker, or phones),....
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At VHF, both the 1/4-wavelength monopole and the 5/8-wavelength monopole antennas are widely used. The VHF 5/8-wavelength (144 Mhz) vertical monopole has long held the reputation of providing about a 3-dB gain advantage over the 1/4-wavelength vertical....
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I created a simple game console that could play Pong and other games with Atari 2600 joysticks, which the Arduino would read the joystick inputs and output the data to a TV with a TVout library. I created this project just for the fact that I wanted to....
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Here are instructions to turn such a tester into a not-so-precise analog display to monitor the CPU load on a Linux system, controlled by a serial port. You can build two variants of the display: - An AA Duracell battery with a tester. Energizer testers....