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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741 RC Oscillator (CB19350E)
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Found in a 1974 Radio Shack documentation. This circuit must have a connection to the ground of...
Pole finder (CB5950E)
This sensitive circuit detects the live pole of a power grid or outlet. The circuit makes use of a high...