This is the receiver circuit for the previous remote control published in the same Radio Electronics magazine of November 1987. The sensor is a common phototransistor.
This FM transmitter was found in a 1997 magazine but can still be easily assembled. 18-wire in the...
Other operational amplifiers can be used in this conventional filter that rejects only one...
This fuzz guitar circuitry was found in an American documentation from the 80's. Transistors can be...