Microphone preamp (CB22043E)

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

Precision clock oscillator (CB9648E)
This circuit with 10 MHz and 1.25 MHz TTL outputs was found in an American documentation from the...
Vocal Filter (CB25355E)
We found this circuit for vocal effects in the September 1990 issue of Radio Electronics magazine. The...
Transistor voltmeter (CB20582E)
This is a voltmeter with high input resistance. The transistor is germanium. We found it in an...