I am trying to design a circuit that will take ~12v from my car's electrical system, and step it up to around 24v for a 12" powerbook. I need between 3 and 4 amps of current.
I'd like to be able to have the power supply have some sort of delayed shutdown (by a few seconds).
I barely know where to start.
In that case, you might consider an off-the-shelf solution such as:
iGo's main competition is from Targus:
iGo and Targus both have "solutions" that can take in either 12V DC or
120/240VAC (you just change power cords) -- this is quite convenient if you want to leave the existing power supply at home as a spare and just carry around one "brick."
Car inverter (12VDC-120VAC) 150W around $30-40...
Don't know if 80W is enough here but $12.63 sure looks like a bargain:
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