Hearing Aid Amplifier (T895E)

This circuit was found in a 1944 documentation. It uses 3 micro tubes which were becoming popular at the time for portable applications.

1W Transmitter (CB4044E)
This transmitter for the 7 MHz range, as we can assume by the number of turns of the coil, since the...
Binary Divider (CB6609E)
This circuit was obtained from a 1967 General Electric documentation. The circuit makes use of...
Voltage to Current Converter (CB4820E)
This circuit is from an Electronic Design of the 90's. The circuit can be implemented with more...