This is the receiver for the earlier system published in the August 1988 Radio Electronics magazine. Optical capabilities can be used for extended range.
Adafruit Breakout PDM Microphone This Adafruit tested microphone card is available from Mouser...
This circuit was obtained in a Radio Shack documentation from 1977. The circuit generates a...
This simple calibration circuit consists of a crystal oscillator that generates an accurate 100 kHz...