Heartbeat Detector (CB25472S)

This heartbeat sensor circuit was found in the July 1992 issue of Radio Electronics magazine. The circuit uses a 741 with a single power supply.

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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...