The diagram shows a tone control with the LM381 IC. The circuit is from a Radio Electronics from February 1990. The power supply is single.
If you have a disused old computer, the type that still has a parallel port, you can use it in...
Using earphone for listening, this receiver has only one germanium transistor. The circuit is from...
This oscillator can generate signals up to a few megahertz depending on the crystal used. Actually...