Solar timer (CB20498E)

This very low consumption circuit can be powered by a solar cell. The time indication is given by a microammeter.

Implantable transmitter (CB9394E)
We found this circuit in a 1967 American documentation. It is a transmitter for animal research,...
Pierce Oscillator (CB25680E)
This version of the Pierce oscillator with the 2N3904 was found in the January 1994 issue of...
Variable mixer (CB9032E)
This dynamic mixer allows for smooth adjustment of the signal's passage from one channel to...