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 obtained in an old Argentine publication, using germanium transistors and...
This circuit was originally found in a Philips documentation from 1969. It is intended for sensing...
Found in old documentation, this simple test checks both the polarity and the existence of voltage...