This circuit is from a Radio Electronics from February 1966. The circuit is of a type that was found in many applications at the time as output from radios, televisions and other equipment.
We found this circuit in a Radio Electronics from January 1967. The SCR is already the C106, which...
We found this circuit in a 1975 technical publication. Its purpose is to compress the dynamic...
This circuit is suggested by Texas Instruments allowing the modulation of a transmitter from TTL...