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0-50V 2A Bench power supply

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 = 4.7 K potentiometer
P3 = 10 K potentiometer
C1 = 1nF
C2 = 10nF
C3 = [...]

Combination Lock

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 [...]

VHF Audio Video Transmitter

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 [...]

Linear FM 30Watt

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 = BLY89
RFC [...]

Digital thermometer

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

200W audio amplifier

Voice activated switch

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 [...]

Sound SCR Switch by IC 1458 & SCR C106D

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

Hand Clap Electronic Control

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 the [...]

Inverter 12V to 220V 100W by Transistor

12V To 220V 50Hz Inverter 50W by M706B1