Collection Schematic

Friday, December 12, 2014

Wireless IR headphone receiver schematic

This is example circuit of Wireless IR headphone receiver.A photodiode Dl feeds high gain IR remote control preamp 1C, a CA3237E. U2 is a PLL FM detector tuned to around 100 kHz.

6v 12vdc converter circuit

This inverter circuit can provide up to 800mA of 12V power from a 6V supply.
For example, you could run 12V car accessories in a 6V (British?) car.he circuit is simple, about 75% efficient and quite useful.

By changing just a few components, you can also modify it for different voltages.

Transistor Checker

This simple circuit can 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 operation is as follows. The 555 timer ( IC1 ) is set up as a 12hz multi vibrator.

The output on pin 3 drives the 4027 flip-flop ( IC2). This flip-flop divides the input frequency by two and delivers complementary voltage outputs to pin 15 and 14.

Thursday, December 11, 2014

D I Y Gold Detector Schematic

Here the very simple and easy build gold detector circuit.The circuit capable to sense gold or metal or coins from a distance of about 20cm, depending on the size of the object to detect.The circuit oscillates at ab out 140kHz and a harmonic of this frequency is detected by an AM radio.You can simply tune the radio receiver until a squeal is detected.