Found in Popular Electronics from the 90s, this circuit consists of a timer that turns off the power of a circuit after a time determined by C1, saving the battery.
This basic tone control circuit employs a Philips NE5538 operational amplifier, but can be adapted to work...
The light effect obtained with the circuit shown in figure 6 is different from the others: it...
Found in an old Radio Electronics, this circuit is intended for the modulation of composite video...