The integrated circuits used in this thermometer are not very common today. The indicator is a microammeter for a scale from 0 to 100o C. The supply must be made with a voltage of 1 to 12 V.
Found in Radio Electronics from May 1959, this transistor tester is quite sophisticated. The...
This circuit was obtained in an American documentation from the 80's. The transistors can be...
We found this circuit in a 1978 publication. It can be implemented with modern transistors like...