Transistor gain meter (CB20522E)

This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the time.

Frequency Standard (CB206E)
The circuit shown in Figure bellow generates frequencies of 50 Hz, 100 Hz, and 200 Hz. The circuit uses a...
Tunable Notch Filter (CB14923E)
This circuit rejects frequencies around 1 kHz and can be adjusted using C1. Equivalent operational...
FM Transmitter Multiplex Mixer (CB18779E)
From stereo inputs, this circuit generates a modulated and multiplexed signal to be transmitted in the FM...