Ripple Filter (CB6724E)

This circuit was found in a Delco 1965 publication. Transistors may be current equivalents according to the desired output voltage and current.

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Fast Sampling and Retention 2 (CB5957E)
This Sample & Hold circuit configuration is from an American 1980s documentation. The circuit uses...
Soil Irrigation Monitor (CB16439E)
By LED flashes you can get an idea of the degree of moisture in the soil. The sensors are wires...
Electronic Defense (CB22479E)
Found in an old Popular Electronics, the purpose of this circuit is to give a strong discharge in an...