This circuit is from 1967 General Electric documentation. It uses SUS which are not very common components today. The maximum frequency should not exceed a few kilohertz.
March 2017 - The new Texas Instruments TPA3244 class D amplifiers with power ratings from 60 to...
Found in an Electronic Design from the 90's, this circuit measures the equivalent resistance in series...
This interesting sine wave oscillator circuit for the audio track uses an incandescent light bulb...