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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DC to DC Converter (CB6580E)
This circuit was found in an American documentation from 1970. We can increase the number of...
Tremolo Using the 555 IC (CB841E)
This sound effect for guitars uses a 555 to modulate the signal from an instgrument pick-up. The...
Tape preamplifier (CB20575E)
With NAB equalization we found this circuit in an English documentation from 1967. The transistors used...