This battery-powered micropower supply was shown in Radio Electronics magazine in 1991. The maximum current is 170 mA. and the integrated circuit is the MAX655 from Maxim.
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...