Actuating a momentary (ON) push-button switch latches a bathroom exhaust fan (or other load) on or off. Push the switch and T2, a BS170 NFET, is latched on and the fan turns on; push it again and T2 ...

The push-button ignition ... Flipping a switch on a surge protector could give you access to nearly 2,000 watts. That’s not a small sum, but pushing a button to start a car gives you the power ...