This powerful pushbutton uses a power MOSFET. We found it in a Popular Electronics magazine from the 90s. The MOSFET must be mounted on a heat sink.
This circuit uses common transistors for a fault indicator that turns on an LED and provides an...
The sensor of this circuit is a common silicon diode and it directly drives a small cooler with a...
This circuit found in a documentation of the 90s, uses integrated common at the time, but...