This circuit allows the detection of RF signals using the lowest range of direct currents of a common multimeter. Equivalent diodes such as 1N34 can be used. The circuit is assembled in a ballpoint tube.
We found this circuit in an American documentation from 1977. In it we have the way to use an...
This circuit is from a 1986 Revista Española de Electrónica. It consists of an amplifier with...
This circuit, which uses a planar silicon sensor, is from a 1964 Electronic Design. The component...