5V Powwr Supply Crowbar protection MC3425 (CB14530E)

This circuit is suggested by Motorola in its 1990 Linear Databook. The integrated circuit is no longer common in the market.

LM381 Tone Control (CB25277E)
The diagram shows a tone control with the LM381 IC. The circuit is from a Radio Electronics from...
Cheap radio control (CB7172E)
Very simple, this radio control circuit for short distances was found in an Electronic Design from...
Non-inverting amplifier with LM741 (CB25921E)
From an article in Radio Electronics magazine, May 1989, this circuit requires a dual power...