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 was found in a 1978 English magazine. It is a configuration that aims to select the...
This circuit was found in Maxim's documentation from the 90's. The circuit provides 12 V x 120 mA....
This circuit can be used as a shield. Its purpose is to detect the positive front of a signal...