Low Voltage Test (CB22158E)

This is a simple voltage tester for voltages from about 2V to about 15V with the indicated resistor and red LEDs.

Hybrid MW radio (CB20516E)
With the name of transitube we find this MW receiver in documentation from the 50's. It uses a...
Gain Mike (CB17140E)
This type of circuit is interleaved between a microphone and a transmitter in order to improve the...
AC Switch with Triac (CB25858E)
We found this circuit in an Electronics Now magazine from June 1995. The transformer has a primary...