Subwoofer Filter (CIR25262E)

This low-pass circuit was found in the December 1990 issue of Radio Electronics magazine. The circuit is part of a home theater sound system.

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Simple Brake Light (CB10668E)
This circuit came out in a publication called Electronics Handbook of 1993. The circuit shows how...
Double limit comparator (CB9581E)
Found in documentation from the 1980s, this circuit makes use of general-purpose diodes and...
Telephone recorder (CB9236E)
This circuit memorizes through an LED indicator if your phone was used during your absence. The...