Idea for a cheap 12 voltage regulator perhaps...
I'm driving along in my car and I have an idea for a 12v regulator that I thought I would try putting by you guys. Maybe someone can poke holes in the idea, who knows.
Anyway, the ideas is as follows:
Pick up a 12v dry cell battery that is large enough to run an epia system for say 10 or 15 minutes. You also need one of those low dropout 12v regulators that needs an input of around 13.5+volts and a diode that would handle the current.
Put the diode inline with your car power then the 12v low dropout regulator and then finally the battery. You could probably throw a cap after the small battery, then run to your DC-DC power supply.
My thought is if the voltage should fluctuate below what the regulator could handle it cuts out but the 12v battery supplies the juice for the short period of time. Otherwise the battery will be charged at a constant 12v and everything else would be happy.
Anyway, can anybody poke some holes in this idea?