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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Logarithmic Amplifier (CB17162E)
This circuit appears in this section in configurations that use other op amps. This is from 1999...
Capacitor Box (CB26041E)
This bench circuit was found in the February 1998 issue of Electronics Now magazine. It can be...
DC Motor and Stepper Controls with the A3906 (CB12513E)
The A3906 integrated circuit from Allegro MicroSystems (www.allegro.com) consists of a single-step motor...