This simple circuit for the 3 to 30 MHz range was found in the Electronics Experimenter Handbook Special Projects of 1983. The coils consist of 10 and 50 turns of 32 wire on a 1 M x ½ W resistor.
The transformer of this unit found in an old Japanese documentation can have 22 to 25 V of...
Suggested by a 90’s Radio Electronics, this circuit automatically activates the recording switch of an...
This brightness control for incandescent lamps or engine speed has been found in a 1970 English...