This simple three-LED sensor uses an NTC at the input. The circuit is based on an uncommon integrated component today. We found it in documentation from the 80s.
This circuit is from a 1966 Motorola Field Effect Transistors Manual. The circuit makes use of...
This circuit was found in an American documentation from the 90's. The transistor is a general...
In the figure we have a high input impedance stage with a general purpose PNP transistor. An NPN transistor...