We found this circuit in the March 1992 issue of Radio Electronics magazine. The circuit has a range from 1.25 V to 1 kV. The formula for the voltage values is given.
This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate...
Found in an Electronic Design from the 90's, this circuit supplies voltages of 5 V and 3.6 V from...
September 2017 - Texas Instruments PCM186x and PCM186x-Q1 Audio ADCs can be found at Mouser...