High Gain Amplifier (T137E)

This high gain amplifier stage uses a pentode valve. The circuit is from documentation of the 50's. The drained current is a few tens of milampères.

Earphones Amplifier (CB838E)
This low Power simple amplifier is intended to the use with high impedance phones. The circuit is...
Low Pass Filter (CB5198E)
This circuit uses only passive components calculated for the desired frequency. We found it in an...
Receiver For Remote Control Using a FM Radio (CB3818E)
This circuit, from a 1987 documentation, is for the CB3817E transmitter. Connected to the handset...