This circuit was found in the March 1997 Electronics Now magazine. It uses a common analog indicator and the transistor is a general purpose one.
This circuit can act as a shield being controlled by a microcontroller by pin 1 or 2. The...
May 2017 - Mouser Electronics announces the availability of new Toshiba SSM6K N Channel MOSFETs...
This circuit is from a 1987 magazine, but it can still be easily assembled, as the components are...