Using the LM3909 this circuit was found in the January 1992 issue of Radio Electronics magazine. Resistor R1 should be chosen according to the table given next to the diagram.
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...