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 low-pass filter was found in an American publication from the 80's. The circuit uses an...
This continuity tester for low resistances was found in an English magazine from 1978. The circuit...
This low-pass filter with 741 op and symmetrical source was found in the August 1993 issue of...