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any electricians out there?

A

agentK

Senior member
sup AT Gurus!? i have my old car audio setup lying around my room since i dont have a car yet to put it into yet. my question is... what transformer do i need to get so i can power my subs, amp and crossover? is there such a thing as a 12v transforemer? how much watts will be enough? i have a PPI a404, an Audio Control 2XS and 2 JL audio 10" in a ported enclosure.

also, im currently making a 12v/7v fanbus. i just bought a couple of resistors for the dual-color LEDs and was wondering if theres any special way i should install them. one side has a brown line, the other doesnt. once i get through with them, can i cover them comepletely with heatshrink tubing or do i need to leave them exposed to dissipate heat (if ever)

TIA! 😀
 
As far as powering 12V gear from your house, it's not gonna be easy. You'd need something with pretty big amperage. I've seen 3 amp supplies at radio shack, but i doubt that would be enough, and they're expensive.

i asked the same thing around here about 6 months ago and there was no real consensus about the best way to go about doing that. I'll be curious if anyone has some input nowadays.

as far as heat shrink, you should definitely cover them with it, it's good practice and looks like a more professional job. check out virtual-hideout.net for a 12v/off/7v fanbus design idea if you haven't already. it's in the how-to area. i haven't worked much with multicolor LED's, so i'm not too much help there 🙂
 
as long as you dont turn it up too high, a car battery charger will work, if its a good one.

ive used them before to test my stuff.

edit: if youre going to be running it for a long time it would be a good idea to have a battery between the charger and amp, but im not sure if you want a car battery in your room :Q😛
 
The problem with using a battery charger is that they do not have output filtering so the voltage, even if the supply is using a full wave bridge rectifier, will be varying between 0 and max voltage at 120Hz. Large electrolytic capacitors are available from lots of surplus places on net so a usable L-C filter could be made fairly cheaply but it probably isn't worth the effort unless you already have the parts in your junk box.
 
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