This circuit doubles the frequency of a rectangular signal applied to its input. The circuit has a 30 kHz input to obtain 60 kHz signals. We found it in a 1964 Electronic Design.
This fuzz effect is from a 1988 Italian publication, but it can be easily assembled, as the...
The circuit presented, from 2006, serves to control loads at a distance, robots, etc. It can be...
We found this circuit in an English publication from 1963. The circuit uses germanium transistors of the...