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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Filter with the LM102 (CB12559E)
In the figure we have a circuit suggested by National Semiconductor, using an operational...
High Voltage Inverter (CB25669E)
For experiments with ionization chambers and Geiger valves this circuit generates high voltage from...
Continuity Test 555 (CB14933E)
We found this circuit in a 1979 documentation, but it can be changed to use more modern...