Scratch filter (CB22152E)

This filter for scratched disc noise was found in an English documentation from 1989. The integrated circuits used are still common today.

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Balance Indicator for Stereo (CB13266E)
This simple circuit indicates when the two channels of stereo equipment are balanced. The diodes can...
Notch and Pass Filter LM3900 (CB4041E)
We found this circuit with an operational transconductance amplifier in the Motorola Linear...
White Noise Generator (CB10655E)
This circuit was obtained in an English magazine from 1978. We can easily assemble it because all...