Circuit High power supply regulater 0-30V 20A by LM338 This is High current and Adjustable Volt 0 to 30V 20A. It easy circuit and nice circuit, Because use IC LM338 and IC 741. Volt Output adj by VR1-1K. IC LM338 to hold heat-sink. Transformer is 20A up.

Componets R1 = 180 KOhm C1, 6 = 10uF/16V TR1, 2, 3 = BC547 , BC548 R2 = 12 KOhm C2 = 47uF/16V P1 = 10 KOhm trimmer R3, 8 = 47 KOhm C3 = 4,7 pF P2 = 47 KOhm trimmer R4 = 3,9 KOhm C4, 7 = 1 nF IC1, 2 = 741 [...]

R1a = 2,2 K R1b =470 Ohm R2 = 10 K R3, R7 = 3.3 k R4 = 390 Ohm R5 = 47 K R6 = 3.3 K 1Watt R8 = 180 Ohm R9, R10 = 0.47 Ohm 3Watt R11 = 0.075 Ohm 2Watt R12 = 470 Ohm P1 = 500K liner potentiometer P2 = [...]

This circuit is very basic to build. To open a lock which is connected to the K1 Load, you must press each momentary switch in the correct sequence. The sequence used in this circuit is S1, S2, S3 and finally S4. If any of the other switches are pressed the circuit will be reset and [...]

The circuit presented here is a simple audio/video transmitter with a range of 3 to 5 metres. The A/V signal source for the circuit may be a VCR, a satellite receiver or a video game etc. A mixer which also operates as an oscillator at VHF (H) channel 5 TV frequency is amplitude modulated by [...]

C1, C2, C3, C4 = 10 – 80pF C 5 = 10nF C6 = 1000pF C7 = 100nF C8 = 2200mF/35V L1 = 1 coil with diameter of 10 mms, 1 mm L2 = 7 coils with diameter of 10 mms, 0,8 mm L3 = 3 coils with diameter of 10 mms, 1 mm TR1 [...]

This digital thermometer use DS1820 measurement temperature from 0-99 ‘C then the temperature will display on LCD 1X16 .The CPU used in this project is PIC16F84A. Software programming with CCS C Compiler. Download CCS Source code

This circuit uses an MC2830 to form a voice activated switch ( VOX ). A traditional VOX circuit is unable to distinguish between voice and noise in the incoming signal. In a noisy environment, the switch is often triggered by noise, or the activation sensitivity must be turned down. This circuit overcomes this weakness. The [...]

From http://www.elecfree.com/circuit/electronic-control/sound-scr-swith-by-ic-1458-scr-c106d/

We have all seen the commercial on TV ………. CLAP – ON – CLAP – OFF – THE – CLAPPER ………… well here is a circuit that will perform that same function. Circuit operation is as follows. A single hand clap will be picked up by the electric mic which is coupled through C1 into [...]