This circuit was obtained in a French documentation from 1981 and can be easily assembled. The analog instrument itself can be replaced by the current scale of an ordinary multimeter.
This LED effects circuit was found in a 1998 publication, but it can still be easily assembled by the...
This circuit for the 11-meter band, operating at 29.255 MHz was found in a Radio Electronics dated...
Found in na 1969 Electronics World, this circuit makes use of transistors of the time. Equivalent...