JFET VCO (CB21133E)

This circuit was found in a Popular Electronics from the 90's. The frequencies depend on the components indicated in the table next to the diagram.

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Gas Analyzer (CB6366E)
This simple circuit found in an American 80's documentation simply blames if there are toxic gases in...
Logarithmic Converter for Photodiode (CB14317E)
The circuit shown is from National Semiconductor's Linear Applications Handbook published in 1994....
Avalanche Oscillator (CB7112E)
Found in a General Electric documentation from 1970, this circuit consists of a relaxation...