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.

Timed Courtesy Light (CB10288E)
I found this circuit in a 1986 English magazine. It can still be easily assembled, exchanging Q1...
MW Wireless Microphone (CB12381E)
We found this circuit in an Argentine publication from the 70s. The coil can be made with 80 turns...
Up to 90 seconds timer (CB21423E)
Found in General Electric documentation from 1967, this circuit makes use of an unusual...