When the momentary push-button (PB) switch is closed, 12V from C3 is applied at A, causing T2 to turn on. This state grounds the Reset bus, turns on PFET T4 by putting V gs(on) on its gate through the ...

When you first apply the supply voltage, V S, all four transistors are off, and capacitor C 1 charges via R 1 and R 2 until its voltage, V C1, is equal to V S.The circuit is now in its off, or ...

I’ve been using C&K KMR2 tact switches on my boards that require tact switches for a few months now. They are approx 4.2×2.8×1.9mm and the exposed SMT pads can be hand soldered.

Waterproof DIY Momentary-push Switch October 20, 2010 by Mike Szczys 23 Comments [Patman2700] has a nice scope for his paintball gun that uses a red dot instead of cross-hairs.