Dave's got another great video on how to use a simple push-button switch as an on/off power switch. Using this circuit can save the cost of a high-current toggle switch and makes a very clean user interface. As usual, Dave carefully explains the details of the circuit in a clear, concise manner.
Neat subject Jon! I have been looking at this for my LED light bar. I was going to use a cheap pic to control it, maybe a fade out feature, then sleep. But soft power switching is something I would like for my projects. I need to spend a week or so experimenting with N and P channel MOSFETS to get more comfortable with them.