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Inside a metal project box — grounded, of course — an ATtiny85 is connected to a button, an opto-isolated TRIAC AC power switch, and a ‘pilot’ light indicating power.
The RadioShack guys, of course, didn't know.<P>As I understand it, the ATX switch is a "momentary" push button, that works like a DOORBELL switch -- i.e. push it in for a momentary connection, and ...
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 ...
If the computer never responds to the power button or always restarts when the power button is held down, the button may be defective. Replacing a power switch for a desktop is relatively simple.
The venerable Stephen Woodward recently published the design idea (DI) “Flip ON flop OFF” that converts a momentary push button to a classic push-on, push-off switch. Figure 1 is an attempt to go ...
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