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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Reflex receiver (CB20557E)
This 1-transistor reflex receiver was found in a 1963 publication. The coil is for the mid wave...
Device On indicator (CB7014E)
Found in a European magazine from the 90s, this circuit emits beeps that are several seconds apart to...
Instrumentation DA Interface (CB18758E)
This interface or shield circuit for instrumentation was obtained in a publication from the 90's....