We found this circuit in the November 1974 Radio Electronics magazine. The capacitors determine the output time, and it is normal to obtain 1 second for each uF used.
This powerful sound emitter used in defense to intimidate people was found in a 90s Popular...
The circuit shown in the figure triggers a relay when S1 is pressed, but this only in the absence of...
This small receiver for the medium wave range was found in Radio Electronics magazine from July...