This OF-1 LO oscillator was found in a 1980s American documentation. The transistor can be any general-purpose and C1 / C2 are determined by the frequency.
This amplifier with gains between 5 and 100 was found in the May 1988 issue of Radio Electronics...
Used with old projector films, this circuit found in Signalite documentation from the 1980s,...
We found this circuit in a 90's Radio Electronics. The low power circuit activates a 12 V relay...