Self-biasing JFET circuit (CB25563E)

This JFET amplification stage was found in the April 1993 issue of Electronics Now. The input impedance is 10 Megohms.

Crystal Pierce Oscillator (CB6149E)
This circuit uses a 100 kHz crystal, but nearby frequencies can be obtained with appropriate...
Power source from batteries (CB8125E)
Found in an Electronic Design from the 90's, this circuit supplies voltages of 5 V and 3.6 V from...
PCM186x and PCM186x Q1 Universal Front End Audio ADCs - Texas Instruments
September 2017 - Texas Instruments PCM186x and PCM186x-Q1 Audio ADCs can be found at Mouser...