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 filter can be implemented with almost any operational. The power suppply must be symmetrical. ...
This small audio amplifier is based on the LM390 with a minimum of external components. We found it...
This crystal fundamental frequency oscillator can operate at frequencies up to a few tens of...