Found in Radio Electronics from the 90s, this thermometer uses an integrated circuit that is unusual today. The sensor is a thermistor or NTC.
This circuit found in Hands On Electronics only connects a load, which in this case is an LED. The...
This circuit is from old documentation, but can be adapted to use modern components. Power...
Found in the March 1989 issue of Radio Electronics magazine, this circuit is used to test printer and...