This small phonographic amplifier was found in a 1967 General Electric documentation. The integrated circuit is from that time, providing 1.5 W of output power.
In the figure we have a good rectangular signals generator with several frequency bands. The...
We found this circuit in a Radio Electronics from February 1966. The circuit uses a germanium...
We found this circuit in a 90s Radio Electronics. The secondary current of the 110 or 220 V...