Mini Megaphone (CB8952E)

Found in Popular Electronics' 90s, this small megaphone is based on LM386. The circuit uses a high impedance microphone.

Fan Control II (CB15517E)
What differentiates the CIR8139 circuit is the use of two inverter ports to trigger the transistor that...
12-V Battery Charger (CB1579E )
The battery charger suggested in the figure has its current limited by resistor R1. This component may...
Buffered Astable (CB24344E)
This circuit with increased power output was found in the November 1974 Radio Electronics...