Popular Circuits Page 37
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if the timer is triggered with a continuous pulse train in the monostable mode of operation, the charge time of the capacitor can be varied by changing the control voltage at pin 3..
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The following is an example for a very simple and high quality JFET preamp. You can use this to amplify a very low signal sources. FET transistors are usually not used independently in preamplifiers. In most of the cases they are paired with bipolar....
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I originally wanted to purchase a Nebulophone but, my El-Cheapo price range didn`t like the tag. I realized that I could program my own AtMega 328 by using ArduinoISP Then I found out that if the code was Arduino compatible, why not just use the Arduino as a....
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The LM1875 delivers 20 watts into a 4 or 8 load on ±25V supplies. Using an 8 load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of....
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In this circuit, Ql is a simple amplifier that has its gain controlled by a variable emitter resistance supplied by FET Q2. In ..
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The Picture beneath is shows the ambit diagram of the SPI Flash programmer accouterments interface, the ability to the interface is provided either by a 9V dc adapter or a 9V battery. The 74HCT367 IC absorber the alongside anchorage signals. It is....
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The following circuit shows the Bedside Lamp Timer Circuit With CD4060 IC. 30 minutes operation, Blinking LED signals 6 last minutes before ....
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ESP - Sinewave generation principles. While this should be a simple enough exercise, it isn`t, and this article explains why....
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This application note presents the component values and measured performance for the MAX2681 mixer IC when tuned for GPS operation at 1575MHz....
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Early DACs contained standard R-2R ladder networks, and produced a negative output voltage. These early DACs, such as the MAX7837/7847 and the MAX523, require both positive and negative supply rails to accommodate their negative output. With the transition....
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With very low harmonic distortion, 2N4416 JFET is suitable to smoothly oscillate in a circuit. On application where low harmonic content is required for a good mixer circuit, JFET local oscillator is very good. Below is the circuit diagram of Low Distortion....
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I am rewiring my entire house after a major malfunction of two antique knob and tube circuits. I`m up against a challenge with some outdoor lights. Here`s the situation: I have a detached garage. It has a porch light over the service door, and it works on a....
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An article on How to make an inverter using simple 40 Watts inverter circuit diagram and schematics. This is a 12 volts to 220 Volts inverter using CD4047 IC....
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This following circuit shows a 3A Switching Regulator Circuit. This circuit based on the LM317K IC. This is a simple and low cost switching ....
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The LM317T output current can be increased by using an additional power transistor to share a portion of the total current. The amount of current sharing is established with a resistor placed in series with the 317 input and a resistor placed in series with....
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With the help of a simple ceramic piezo-electric detector it is possible to assemble an interesting and useful Impact sensor unit,which can be used to dete....
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I didn't realize till the other day that I have never shown a circuit for a standard power supply. Shown below is a supply that will use any of the LM78XX series of voltage regulators. The transformer in the circuit will vary depending on which regulator you....
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The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead type thermistor is found in the Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of temperatures. A slight amount of....
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Circuit uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1. 5 sec by varying the preset VR1...
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The list of best & free Android Applications for the Electronics & Electrical Engineers like simulators,resistor color code,electronic tool kits....
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A problem we see a lot is that people have a schematic (otherwise knows as a circuit diagram) that they want to build. But they find there are....
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This article focuses on a minimal resource microcontroller implementation for a 3 phase BLDC motor, closed loop speed motor controller application based on a Microchip PIC12 device. It shows how minimisation techniques can reduce the number of I/O pins to....
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Wiring 2-Wire Intercom. According to Wikipedia, an intercom is a stand-alone electronic communications system intended for limited or private dialogue....
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A simple FM transmitter links your home-entertainment system to a portable radio that can be carried around the house and into the back yard. For example, you can play music on the CD changer in your living room, and listen to it on a portable radio by the....
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This is one complete inverter project which features automatic mains switching, automatic charging when mains is present, and automatically starts inverter when mains is off. Sir, I want to build solar inverter for driving A. C. load of 200watt for 5 hours.....
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Inexpensive miniature transformers normally provide one or two secondary voltages, which is sufficient for generating a set of positive and negative supply voltages, such as are needed for operational amplifier circuits. But what can you do if you need an....
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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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This circuit is designed to trigger on a 1 khz tone. to change this frequency - refer to the table below, then change the resistor and capacitor values accordingly...
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A hifi preamplifier designed to convert high output impedance amplifiers to 600 ohm outputs....
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The temperature sensor provides an input to pin 3 of the NE5037 of 32 mV/°C. This 32 mV is the value of one LSB for the NE5037. The LM334 is a three-terminal temperature sensor and provides a current of 1 p.A for each degree Kelvin. The 32-KO resistor....
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Circuit stereo TDA2822 audio power amplifier circuit schematics Circuit Electronics, In this series I use IC tda2822M as the main amplifier, but if you want to use in addition to IC TDA2822M you can use ic I mentioned this is KA2209, NJM2073....
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TDA7088 contains a frequency-locked-loop (FLL) system with an Intermediate Frequency (IF) of about 70 kHz. For supplying this circuit we can use an 3 volts battery cell or a regulated power supply. ..
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The module costs GB38. 00 and the transducer costs a further GB17. 00. In fairness, the Polaroid module does the job it was intended to do, which requires the range, but that job is not to provide the eyes of a small robot. The circuit is designed to be low....
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This circuit takes signal (doppler) from a radar,un, amplifies and limits it, and feeds the frequency into a counter (U4) and display circuit (DISP1, DISP2,U5,U6). Counter calibration is set by clock circuit U2B. Calibration is obtained via R21 and R22. R21....
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The range of this transmitter is about 50 feet with a short whip antenna. The tone generator, is made up of a unijunction transistor, Q1, and R1, R2, R3, and C2. Transistor Q1 pulses on and off at a rate determined by the time constant of R1 and R2,....
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The circuit employs the functions of reed switches to produce a gate alarm that is powered by a universal AC/DC power supply Oscillator ...
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Circuit by the delay loop, discriminators, output circuits, power and lights of five parts. Part of the power regulator by resistance R, and the regulator vs constituted power ..
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Mercury, Oldsmobile, Plymouth and Pontiac cars, muscle cars and antique Classic Car Wiring is constantly adding available diagrams to this site. Here is the wiring diagram Porsche 911L engine for the 1968th car model This pattern has already changed since....
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I was intrigued while playing the motion games on Nokia 5800. I was thrilled, how I could control the racing car by only tilting the phone. I used to drea..
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ISP programmer with circuit diagram for AVR Atmega32 micro controller.This ISP burner circuit is an adaptation of Pony programmer and uses ponyprog software..
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Using a mobile phone while driving is dangerous. It is also against the law. However, you can use your mobile phone as a powerful music player with the help of a stereo power amplifier. This does away with the need of a sophisticated in-dash car music....
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This making adopts the port as supplying power of USB mouth, carry on the information acquisition of the temperature with DS18B20 temperature sensor, control with AT89C2051 one-chip computer, adopts the common anode nixie tube of quad bit to reveal, thus....
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A very loud sweeping siren type audio sound generator powered by 3v. The circuit uses a LTC1799 precision frequency generator from Linear Technology. A 74HC14 hex Schmitt trigger from Texas Instruments is also used to perform several other functions. One....
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This circuit indicates which of three voltages in the range from about about -4V to about +4V - at A, B and C - is the highest by lighting one of three indicator LEDs. Alternatively, it can be wired to indicate the lowest of three voltages or to indicate....
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This project comes via two circuits on 2 boards. The first circuit is designed around a PIC16F628A. It has been presented on an experimental PC board using surface-mount components and was built in less than 1 hour, with about 2 hours to write and finalise....
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Figure A is an R/2R resistor ladder. Each switch that is closed increases the amount of current at . A simple channel A/D converter is shown in Fig. B. The voltage reference (D2) is common to all channels, but-the value of the dropping resistor (R9) varies....
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Fade-in fade-out light switch can turn on and off when the lamp brightness changes slowly, and the brightness can be adjusted. (1) One of fade-dimming lamp switch circuit circu..
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This simple robot, which responds to light and avoids obstacles, can be built without using a microcontroller, programmer or PC. The only special` component in the circuit is a window discriminator (a fancy version of a window comparator). Resistors R1 and....
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A common need in many systems is to obtain positive and negative supplies from a single battery. Where current requirements are small, the circuit shown is a simple solution. It provides symmetrical ± output voltages, both equal to one half the input....
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How to add an AC-3 RF output to older laser disc players. Finally I was ready to try it myself. Kevin Nakano`s web page (link below) was very helpful. His page describes how to do the modification to a CLD-D702. My CLD-1090 is very similar to the CLD-D702.....
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3-wire interface to the AD7714 can be equipped with a variety of microcontrollers (including microcontroller or microprocessor). 3-wire serial interface is particularly suitabl..
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This 3 volts Car Adapter circuit is based on a standard LT1074CT switching regulator IC. The schematic shows the LT1074CT used as a positive step-down or ‘buck’ converter. The ‘switcher’ is used to convert a +12-volt car battery voltage down to +3 volts for....
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The politely welcoming electronic doorbell circuit is composed of the trigger control circuit, audio amplifier output circuit, music circuit, voice delay control circuit, and it is shown in Figure 3-122. Trigger control circuit is composed of the doorbell....
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When button S12 (#) is pressed, a positive voltage fed through R1 appears at the base of transistor Q1, turning it on. When Q1 is conducting, pin 1 of U1 is brought to ground (low) or the battery`s egative terminal. With pin 1 low, two things occur: Pin 8 of....
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A multi wire cable tester with a separate LED for each wire. Will show open circuits, short circuits, reversals, earth faults, continuity and all with four IC`s. Designed initially for my intercom, but can be used with alarm wiring, CAT 5 cables and more...
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A simple non-commercial grade multiplexer compatbile with telephones. It will supports 4 telephone lines, and will multiplex over one cable. The topic was free of choice, but had to be oriented aroudn the theme of "PrG©vision" (prediction). As you may have....
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I worked on developing a digital frostpoint hygrometer for measuring water vapor at NOAA. Using an old analog instrument as a reference, I created this new hygrometer using AVR microcontrollers and other digital electronics. I laid out the circuit board....
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The regulated output voltage varied as the unregulated DC voltage changed, and that changed as the load current or the incoming AC line voltage was varied. There was no easy fix to the existing circuit that would solve this problem. Eric WB6FLY had already....
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This LED flasher circuit uses 555 IC, and is capable of driving up to LEDs. The good news is, the use of multiple LEDs in series doesn`t increase the power....
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The Dremel drill fitted with a mini drill-chuck on a stand is a great setup for drilling circuit boards. The problem is that it does not do low speeds very well. My unit had a failed internal speed controller, so I just wired around it and connected it to a....
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Voltage to be sampled is applied to the input which is one end of R2 (100K linear taper potentiometer). The other end of R2 is grounded and thus the level of signal applied to buffering level shifter U1-A and associated components is controlled by R2.....
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This project shows how to create an MB Electronics Simon game clone using an 8-pin PIC12F683 microcontroller. The game includes a full emulation of the original Simon `game 1` and the ability to select from 4 skill levels which control the number of colours....
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This circuit utilising a 555 timer IC can be used as an alarm system to prevent the theft of your luggage, burglars breaking into your house etc. The alarms goes ON when a thin wire, usually as thin as a hair is broken.
The circuit is straightforward. It....
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The Hewlett-Packard HSCH-3486 zero-bias Schottky diode is used as the detector. To avoid using a modulation method of detection, a chopperstabilized op amp is used. The chopper op amp basically converts the input de voltage to ac, amplifies it, and....
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Using circuit depicted in the schematic diagram below, the direction and shaft rotation of stepper motor can be seen on the LED display. Alternative to digital rotation encoder as a digital encoder input, this circuit uses a stepper motor. Here is the....
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Microcontrollers are just silicon wafers until we tell them what to do, program them according to our requirement.Read More....
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That be On After Delay Circuit. I uses mosfet in the circuit for delay easy more than the transistor. By have the work of the circuit be when press , S1 ,...
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You can use any LED you want for D1 - D10, however blue LEDs have a higher voltage requirement so if you want to go blue for a modern look, they may appear more dim then red, yellow or green. By leaving pin 9 of U2 disconnected, the graph will operate in dot....
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Except for use as a normal Battery Charger, this circuit is perfect to `constant-charge` a 12-Volt Lead-Acid Battery, like the one in your flight box, and keep it in optimum charged condition. This circuit is not recommended for GEL-TYPE batteries since it....
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This circuit uses three easily available 555 timer ICs. All three work as astable multivibrators. The first 555 has an on period and off period equal to 1 sec. This IC controls the on/ off periods of the other 2 555s which are used to flash two bulbs through....
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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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While we have published a number of variations on a standard RIAA preamplifier for magnetic phono cartridges, we have not published a preamp stage for cer....
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Using a single op-amp this easy to make equalizer offers three ranges, low frequency, mid frequency, and high. With component values shown there is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz. Supply voltage may be anything....
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220V AC by the VDI-VD4 bridge rectifier to produce a full-wave pulsating voltage electricity for lights H1 ~ H4, the other side by R3 and VD4 buck regulator, C2 filtered output..
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Integrated-circuit Ul—an LF351 or 741 op amp—is used as a comparator to control the light. Resistors R2 and R3 provide a reference voltage of about 2.5 volts at pin 3 of Ul. When daylight falls on light-dependent resistor LDR1, its resistance is low:....
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This circuit is capable of amplifying the output from a 150-ohm dynamic microphone to line level in a single stage, courtesy of a little thing called an instrumentation amplifier. They`re like op-amps but with settable gain and much better common-mode....
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Remotly check the temperature of a few things, in my case the repeater site at GB3PY. A system which used a radio to receive requests for the currenttemperature and send the results back to the user. Requests are by DTMF tones and the response is in CW,....
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An active component, a CDTA, can be used as the basis for a variety of different filter responses, selecting the different responses by changing bias current to the amplifier....
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This circuit was requested by an school teacher. It is a simple intercom that anyone can put together and get to work. It is based on the LM380 IC chip. T....
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The Zero Volt Diode (ZVD) is a circuit useful in a variety of applications including solar chargers of all types. It is a novel circuit in which a power MOSFET acts like a very low voltage drop diode that switches state at 0V and which is used to conduct....
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This divider uses a variable-length shift register, a type-D flip-flop, and an inverter. The clock feeds the..
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The TiltStick is a small acceleration sensing device in form of a USB stick. It's using a two axis acceleration sensor to measure acceleration (caused e.g. by motion and tilt). The device is emulating a USB joystick and can thus be used in conjunction with....
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A monostable multivibrator (MMV) often called a one-shot multivibrator, is a pulse generator circuit in which the duration of the pulse is determined by the R-C network, connected externally to the 555 timer. In such a vibrator, one state of output is stable....
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The following circuit shows about Designing Simple Digital Multimeter Circuit Diagram. This circuit using the ADD3501. Features: combines (volts, ....
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Hi all, My 6 year old son and I saw this on youtube I then pressed `print screen` from the video to cobble together this: ....
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This is a simple transistor-based burglar alarm circuit. Its features include automatic Exit and Entry delays - together with a timed Bell cut-off and Reset. It`s designed to be used with the usual types of normally-closed input devices such as -....
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You can cut away the 555 timer oscillator part and add your favorite microphone modulating circuit to transmit voice over to your tv set with a little tuning. Schematics in Schematics Depot were found on the internet and assumed to be in public domain.....
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The 1381 solar engine uses a 1381* voltage detector (a.k.a., a voltage supervisor) IC to drive a voltage-based (type 1) solar engine. The 1381 is normally used to reset CPUs and Micros when the power supply drops too low for reliable operation. So 1381s....
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A common topology for DC-AC power converter circuits uses a pair of transistors to switch DC current through the center-tapped winding of a step-up transformer Examine these checkplot images from a PCB drafting program, for a control board based on this....