This circuit, found in a 1977 documentation, indicates when the grid voltage goes through zero. Under these conditions, it produces an output pulse whose duration depends on the capacitor.
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...