This circuit was suggested by Analog Devices in 1980s documentation. The circuit has a grounded bias and sensor.
This circuit was obtained in an old English magazine (TSI) 1998 and consists of a Schmitt trigger...
This circuit is from a Radio Electronics from August 1964. The transistor is from the time, but...
The AT21CS11 memory device offers an extended voltage range to accommodate lithium-ion battery...