We found this circuit in a 1965 Electronic Design. Transistors are still common but admit equivalents for some of them. The circuit drains a current of only 4 mA.
This simulation shows how a transistor can be used as a switch turning on and off in the LED. The...
This amplifier was found in a Japanese publication in 1972. Transistors are Japanese types of the...
This circuit was obtained from a Hands-On Electronics, an American magazine from January 1987. The...