Using a 4046 PLL this circuit generates rectangular signals in three wavebands that depend on the capacitors used. The circuit is from a Radio Electronics from December 1989.
This circuit can control two loads and is also equipped with a light sensor for its trip. The...
This linear oscillator was found in a 1968 publication. The operational amplifier is from that...
This circuit triggers the relay when the temperature exceeds the value set on the trimpot. The...