Half wave power supply (V1572E)

This tube half wave source is from a 1938 manual. Tube type and voltage depend on design. Filter shock is on the negative side of this circuit.

Night Switch (CB491)
This circuit turns on a lamp when the night comes and turn it off in the morning. The circuit...
Balanced Microphone Preamplifier I (CB4943E)
This circuit was obtained from an American publication of the 80's. The integrated circuit is of the...
Operational Flip Flop (CB4839E)
In the figure we have a traditional flip-flop configuration implemented with two operational...