Mini Megaphone (CB8952E)

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

Medium impedance stage (CB20563E)
We found this circuit in an English publication from 1963. The circuit uses germanium transistors of the...
Slow Turn On Power Supply For Amplifiers (CIR815E)
This circuit is used to cut the “click” in the loudspeaker of amplifiers when they are turned on....
a Fluorescent Rhythmic Light (CB4324E)
This simple rhythmic light circuit uses a 110 V to 220 V transformer and can hold a good number of...