This amplifier was found in a tube equipment manual from 1947. The high-fidelity circuit has pentode tubes at the output and a source with transformer.
This circuit is from the Motorola Linear Databook of 1990. The values of the components depend on the...
This low power audio amplifier was found at 1992s Popular Electronics. Transistors are general...
Found in a 90s Electronics Now, this circuit multiplexes audio signals for stereo transmission. The...