A basic component could be a dc:dc converter .. search your favourite component supplier.How do you stepup voltage without a transformer or battery cel? just using basic componants, I'm looking at different small DC circuits using different voltages like a 12v circuit from a 5v circuit, mostly I just want to know how?
Excellent answer, and I salute the patience on #12's part. I agree, what you need is a step-down arrangement. You can find a little adapter that plugs into the cigarette lighter and puts out USB at 2.1 amps. That's probably your best bet, and you can just use a regular micro-USB cable to power your Pi in that case. If the 12V battery is outside of a car, you can rewire the adapter to make the right connection.I find it difficult to understand your sentences, but I will keep trying.
The AA batteries will not survive a 1 amp load for more than a minute or so.
If a car battery has 12 volts and the Raspberry needs 5 volts, you do not need to boost the voltage up from 12 volts to 5 volts. You need to reduce the voltage. We use a voltage regulator to do that. Some of them only need 3 or 4 parts.
Stepping up the voltage of any DC source (be it a battery or something else) requires a special circuit that may or may not be beyond your expertise. You can always buy an easy to use module for this purpose. But if what you want is to build the circuit yourself, then I think you should know that it's not a project I'd recommend to a beginner in electronics.I'm sorry I have given a bad example, as I was trying to give you an example because you needed hard facts, the fact is I just want to know how you step up a 5v PSU to 12v ? I understand the ampage of a battery cell has to be capable(I learned this fact from your replys) I'm sorry If you cant read my posts, thankyou for your time.
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