Gain 10 Amplifier (CB25636E)

Using a general-purpose transistor this AC amplifier was found in the November 1993 issue of Electronics Now.

Projector control (CB8299E)
This old slide projector control circuit was found in an 80s Hands On. The circuit uses modern...
SUS Frequency Divider (CB19903E)
In the figure we have a circuit that uses unusual components, being indicated for low frequency...
Rain alarm (CB6955E)
The sensor of this circuit found in Popular Electronics can be formed by a piece of fabric between two...