3-tube receiver (T1602E)

Found in a 1949 Radio Electronics, this circuit employs vacuum tubes of the time. Power supply not provided.

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...