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 the March 1994 issue of Electronics Now magazine. The circuit uses a...
This receiver for an audio link by modulated light was found in a 90s Elektor. Transistors are common...
This circuit was found in a 73 magazine for radio amateurs from the 90s. The circuit uses high...