This circuit was found in the November 1994 issue of Electronics Now magazine. The circuit is based on the 566 PLL and generates signals up to about 200 kHz.
November 2016 - Already available from Mouser Electronics on Texas Instruments' new DS280BR820...
This circuit is from the 80's component manual itself, but can be applied to more modern...
We found this circuit in the June 1992 issue of Radio Electronics magazine. The sensor is a common...