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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Touch Controlled Timed Motor (CB11860E)
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Operational Amplifier Test (CB11246E)
I found this circuit in an old British magazine from 1976. It is possible to test operational...
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