Full Wave Power Supply (V1573E)

This typical full-wave power supply circuit is from a 1938 manual. The circuit has two voltage outputs and uses two filter inductors.

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...