Unijunction metronome (CB21701E)

This traditional metronome circuit is powered by voltages from 9 to 12 V and output drives a common speaker.

Photoelectric alarm (CB22336E)
Found in a publication from the 60's, this circuit uses the CK722, germanium transistor of the...
Ramp Generator (CB16917E)
From an input signal, and using an unusual current source, this circuit generates a ramp, that is, a...
Common Load Timer (CB17040E)
With this timer we can start between 30 seconds and one and a half seconds, time set in the pot....