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 amplifier must be supplied with a voltage of 24 V and the resting current is of the order of 4...
This small unregulated power supply can supply voltages from 0 to approximately 9 V under a...
This receiver of two transistors for the 3.5 MHz band was found in a circuit manual from the 80's....