This commercial transistor tester circuit (EICO 666) is from a Japanese publication from the 1960s. The switch selects the types of test with the switching of the terminals and the gain ranges.
This circuit causes an LED to flash at a frequency determined by the capacitor. The circuit has an...
Found in American documentation from the 1980s, this circuit uses transistors from that time. It...
This very interesting project was obtained in a 1980 publication. It consists of a device that is...