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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Crystal Calibrator (CB3893E)
With the precision given by the crystal this circuit provides signals of several frequencies for the...
Dynamic Microphone Preamplifier (CB4730E
) This two-transistor circuit features excellent gain operating with low impedance microphones. The...
High-speed peak detector (CB9699E)
This circuit was obtained from an American documentation from the 80s. Integrated circuits are...