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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Tone Decoder (CB3966E)
This rather sophisticated circuit does not recognize false tones, such as harmonics, and can be...
Reverse RIIAA Response Circuit (CB13880E)
This circuit is intended for testing circuits with RIAA equalization. We found this configuration in a 1977...
Two Transistors Amplifier (CB918E)
We found this two stage transistor amplifier circuit using RC coupling in a magazine published in...