Infinite impedance detector (CB22041E)

We found this circuit in an old English publication. It takes advantage of the very high input impedance of a JFET. Any common JFET can be used.

Beat frequency generator (CB20378E)
This circuit can be used to listen for SSB signals on receivers that do not have the built-in...
Low Impedance Preamp 2 (CB21895E)
This configuration was found in Raytheon's circuit manual from the 1960s. The circuit has an...
perature Controlled Oscillator (CB13025E)
Tem The CMOS oscillator illustrated in the figure has a frequency that depends on the temperature sensor, a...