We found this circuit in a 2002 documentation. This die shows numbers 1 to 6 on a common anode display when the switches S1 and S2 are pressed. The circuit can be powered by voltages from 5 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...