This circuit is from 2005 documentation. The integrated amplifier circuit must be mounted on a good heat sink and the speaker must be able to withstand the full power of the circuit.
Found in 90s Popular Electronics, this circuit fires a load through a MOSFET from an audio signal...
Found in Radio Electronics from the 90s, this circuit uses components from that time. However, it...
This automatic volume control for audio signals was found in American documentation from the 90s....