This circuit was obtained from the Encyclopedia of Electronic Circuits volume 5 of 1995. The circuit uses the 4001 CMOS to obtain hysteresis in the sensor feedback.
The original frequency of the Pierce Oscillator with bipolar transistor is given by the crystal, which...
Used in radio reception, this circuit was found in the February 1983 Radio Electronics magazine. The...
We found this circuit in the Linear Applications Handbook of the National Semiconductor of 1994....