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.

Up to 100 Minutes Timer (CB12117E)
In this circuit, obtained from a 1979 publication, IC1 is a 555 and IC2 is a 4020. The transistor is the...
Temperature Range Control (CB15792E)
The presented circuit uses a window comparator to keep a relay activated only when the sensor is...
Linear Scale Ohmmeter (CB5932E)
Similar circuits can be found on this site. This is from an 80's American documentation. The...