By combining a common 78L05 with an integrated audio amplifier of the type TDA2030, an adjustable voltage regulator can be constructed in a very simple manner that works very well. The output voltage is adjustable up to 20 V, with a maximum current of 3 A.....

The TDA7000 has an FLL (Frequency-Locked-Loop) system with an intermediate frequency of 70 kHz and the selectivity is obtained by active RC filters. The only function which needs calibration  is the resonant circuit for the oscillator (for the reception....

Based on the SN74LS194 - Bidirectional Universal Shift Register the circuit is designed to drive UNIPOLAR type stepper motors and provides only basic control functions - Forward, Reverse, Stop and Speed adjustment. For the purposes of this page the direction....

The TDA1519 circuit can deliver 2x6 watts output power. TDA1519 is an integrated class-B dual output amplifier in a 9-lead single in-line (SIL) plastic medium power package is primarily developed for car radio applications...

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The following diagram is a very easy and simple electronic combination lock based on IC LS7220. Component Part List: C1 = 1uF 25V C2 = 220uF 25V R1 = 2.2K Ohm Q1 = 2N3904 / 2N2222 D1 = 1N4148 / 1N4001-1N4007 K1 = 12V SPDT Relay / Any approp....

This circuit is designed to drive the 1W LEDs that are now commonly available. Their non-linear voltage to current relationship and variation in forward voltage with temperature necessitates the use of a 350mA, constant-current power source as provided by....

This simple alarm circuit was designed for use in a combined garage and rumpus room. It can be assembled on Veroboard and uses just one IC plus a handful....

Infrared transmitter and receiver circuit shown in the schematic diagram below can be used as remote control. The transmitter is basically an oscillator....

Crystal oscillator circuitis a simple oscillator circuit when we look at the schematic diagram. A crystal oscillator circuit is nothing but a replacement of an ordinary oscillator network, which is a combination of LC. This simplicity is also reflected in....

The core of any transmitter is usually an oscillator circuit, and in simple transmitters (i. e. , QRSS devices), it`s often a crystal. Frequency adjustment is accomplished by adjusting capacitance to ground on one of the crystal legs. Simple oscillators such....

A small biped walker made of 2mm plywood. Powered by two RC servos. it is a popular microcontroller, easily available and programmable now as flash microcontroller 16F84. This simple circuit can be used to program the PIC16F84 and similar "flash memory" type....

simple siren or alarm using MC1458 dual op-amp and audio power amplifier LM380 circuit diagram with descriptions various siren, doorbell, alarm circuit with parts list...

This is a TV transmitter for transmitting video of various video sources such as video cameras, Satellite receivers, DVD players, game consoles, etc. TV transmitter`s circuit is working on the 470-580 MHz frequency and can be received on UHF channels 21-34.....

Equipment designed to detect changes associated with fire, monitor the integrity of their operations and provide automatic control, the transmission of information necessary to prepare the facility for fire, temperature, light based on a predetermined....

The main part of this circuit is the LM386 amplifier chip. It also uses a transistor input to buffer the input signal and provide extra gain for the LM386....

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The ultrasonic signal which was received with the reception sensor is amplified by 1000 times(60dB) of voltage with the operational amplifier with two stages. It is 100 times at the first stage (40dB) and 10 times (20dB) at the next stage. Generally, the....

The OPB350 series liquid Sensor is designed to work with 1/16 [1. 6mm] 1/8 [3. 2mm], 3/16 [4. 8 mm] and 1/4 [6. 3 mm] outside diameter clear tubes. When output reference circuitry is added, multiple output states such as fluid present, no fluid present and....

This is a temperature indication and control system using the AD596/AD597. In this system, AD596/AD597 is used as a closed-loop thermocouple signal conditioner....

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This circuit will energize and de-energize a relay at the push of a button. Any type of momentary action push-to-make switch can be used. Pushing the button once - will energize the relay. And pushing it a second time - will de-energize the relay I`ve drawn....

This amplifier has VHF (very high frequency) and UHF (ultra high frequency) response, you can use it for receiver booster for example. Here is the schematic...

Tom Au-Yeung and Wilson Tang, Maxim Integrated Products EDN You can make a wireless temps system with two ICs You can use a local temperature sensor and an ASK (amplitude-shift-keying) transmitter/receiver pair to design a simple wireless....

In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator to drive a small signal transistor in a class C amplifier configuration. The oscillator frequency can be either fixed by a crystal or made adjustable (VFO) with a....

This circuit delivers an initial voltage of 2. 5V per cell to rapidly charge a car battery. The charging current decreases as the battery charges and when the current drops to 180 mA the charging circuit reduces the output voltage to 2. 35 V per cell,....

You`ve probably seen many of these toys. They`ve been around for years, from the talking tickle me elmo to the talking furby, like the one shown above. How do these devices do what they do when you perform an action such as tickle them or press a certain....

LM5576MHX absolute maximum ratings: (1)VIN to GND: 76V; (2)BST to GND: 90V; (3)PRE to GND: 76V; (4)SW to GND (Steady State): -1. 5V; (5)BST to VCC: 76V; (6)SD, VCC to GND: 14V; (7)BST to SW: 14V; (8)OUT to GND: Limited to Vin; (9)SYNC, SS, FB, RAMP to GND:....

LM3900 [ PDF ] OP consist of four independent and internally compensated amplifiers in DIL14 package that are designed for wide single power supply voltage. ..

Most cars do not have delayed interior lights. The circuit presented can put this right. It switches the interior lights of a car on and off gradually. Th....

This index is arranged alphabetically on each word (except prepositions). For example, the "Frost Alarm" will be indexed under "A" and also "F". To quickly find a circuit use the top index or try your browsers search function. In Firefox, Konqueror, Opera....

Circuit High power car audio amplifier schematics Circuit Electronics, This is a power amplifier which functioned as the car audio amplifier IC that uses PA02 and LH0101. That each IC has a 30W output power with 8 ohm impedance. Part List R1....