Microphone preamp (CB22043E)

This preamp was found in an old English publication. Any usage JFET can be employed. The output is high impedance.

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...