In the figure we have a simple thermometer with NTC, using an analog current indicator. The adjustment is made in the trimpot and the power is done by batteries.
This circuit uses only transistors and was found in a 2003 documentation. Transistor 2N3055 must...
We found this circuit in Motorola's Circuit Applications for the Triac 1971 manual. The circuit is for ½...
This circuit was found in a 1977 magazine, but it can be easily assembled today using BC548...