Unijunction metronome (CB21701E)

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

Negative supply from positive source (CB8843E)
This configuration appears elsewhere on this site. We obtained it from a 90s Radio Electronics, based...
FCS 8100 Clock Module (CB24495E)
This circuit is from a Fairchild digital clock module shown in the March 1977 issue of Radio...
Transistor Amplifier (CB24221E)
This good power amplifier, a few tens of watts, is part of an article in the December 1972 Radio...