This circuit was obtained in the 1990 Motorola Linear Databook. The circuit uses a 139 series comparator, but other series can be used. The power source need not be symmetric.
The sensor in this simple circuit is a NTC (Negative Temperature Coefficient) resistor. NTCs with...
This circuit can be used in 0,5 to 37 V Power supplies and output currents up to 3 A. The...
This detector with ultra-low deviation was found in an American documentation from the 90s....