Audio amplifier 741 (CB20478E)

This low power audio amplifier was found at 1992s Popular Electronics. Transistors are general purpose common types.

Switching regulator without inductors 2 (CB8127E)
We obtained this circuit in a Maxim documentation from the 90s. The circuit is based on the...
Stereo audio meter (CB8228E)
This indicator or VU meter for stereo amplifiers was found in a 90s Radio Electronics. The...
Buffered Detector (CB6669E)
This circuit was found in 1967 General Electric documentation. The transistors of the time can be...