This circuit was found in an American 1980s documentation. It makes use of an unusual MOSFET today and has a separate detector diode. The indicator is a microammeter.
![](/images/stories/cir/224212422023_144242_0001.gif)
This circuit was found in an American 1980s documentation. It makes use of an unusual MOSFET today and has a separate detector diode. The indicator is a microammeter.