This circuit indicates when the voltage of a 12 V battery is low. With changes, for example, the zener, the circuit can be used to monitor other voltages.
This frequency division multiplexing signal decoding circuit is from a 1980s documentation. The integrated...
This sample and hold circuit is traditionally configured and uses an operational amplifier with...
Found in Elektor Electronics from the 90s, this circuit can generate signals from 1 kHz to 9 MHz,...