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 circuit was found in a 1987 magazine. It generates signals in a range from 100 kHz to 10 MHz,...
This circuit, which can generate voltages up to 25 V, was found in the December 1992 issue of...
The circuit is from an Electronics Hobbyst Handbook from the 90s, being valid for panels of the...