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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Square Triangular Oscillator (CB24025E)
This circuit can be used in a toy organ. The frequencies are determined by the capacitors selected by...
OPA1612QDRQ1 Audio Amplifier (COM007E)
May 2016 - Mouser Electronics is sourcing the new high-performance audio amplifiers with bipolar...
Controlled gain amplifier TBA400 (CB21886E)
This circuit was obtained from the 1976 Siemens Integrated Circuits Manual. It is the circuit for...