This circuit for multiple sound inputs was found in a Radio Electronics from January 1992. It consists of a Bargraph connected to a multi-input mixer.
This oscillator for receiving SSB signals is intended for receivers with IF of 455 kHz. The...
This circuit triggers on a relay after a time delay adjusted by P1. The range of times achieved by...
Using a period sensor, this circuit triggers a relay when pressure changes occur. The circuit is...