Rumble filter (CB6541E)

This turntable filter was found on an 80's Elektor. The circuit makes use of operational features that are easily obtainable today.

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Simple voltage control (CB7320E)
This circuit that can only be used with simple resistive and inductive loads (never electronic) was...
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This digital instrument input circuit was found in the September 1989 issue of Radio Electronics...
a Telephone dialer (CB10147E)
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