We found this circuit in a Popular Electronics from the 90s. It operates at a frequency of 15 kHz. Components can be difficult to obtain, such as the integrated circuit.
This amplifier for sound equipment was found in the Philips Databook of 1990. The circuit can be...
I found this circuit in an English publication from 1989. This configuration can be mounted with...
The circuit shown is from a 1978 Texas Instruments optoelectronics manual. The circuit can use...