Solar Frequency Standard (CB21951E)

This solar cell powered circuit generates a standard 100 kHz signal. The circuit is from a 1960 Gernsback documentation.

555 Biofeedback Monitor (CB24775E)
This simple 555 biofeedback circuit was found in the December 1983 issue of Radio Electronics...
5 V high current power source (CB8705E)
Found in a 1969 EDN, this high current circuit, not indicated in the documentation, uses...
Unijunction Transistor Teste (CB1357E )
This tester for common unijunction transistors is nothing more than a low frequency oscillator...