RF Monitor (CB21686E)

This RF monitor or field strength meter can use instruments from 100 uA to 1 mA full scale. The diode is germanium type.

Voltage Doubler (CB17076E)
This simple voltage doubler provides a continuous voltage at its output that is twice the peak...
Emergency light (CB7044E)
This circuit was obtained in an old Elektor and can be adapted to use white power LEDs. The...
Microphone Preamplifier (CB15118E)
This circuit was obtained in an Argentine publication from 1973. The original version uses...