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.
This circuit automatically controls the degree of illumination. As the circuit is from 2001, it...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
This circuit was found in an English publication from 1976. It generates sequential signals in the...