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Old 2nd March 2010, 10:21 PM   #1
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Default portable 12v power supply

I know there's been other threads about this, but this isn't for a car and I think my needs are a bit different.

I'm building a guitar synth and realized that it required a 12v power supply. Everything up to now that I've done has been 9v, so the battery option was pretty easy. I'd like this thing to be portable, so an adjustable worktop power supply isn't something I'm interested in. I'd prefer it be something I could fit in the housing (about 12"x16"x2"). A friend of mine found some DIY stomp box kit that came with both battery and AC adaptor included, giving him the option to plug in at home and not waste batteries, but the option to use a battery on stage when power plugs aren't always available. Something like that would be great, but I can't find what I'm looking for. I can't even find a supplier of AC adaptor jacks. Any ideas?
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Old 2nd March 2010, 10:30 PM   #2
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How about the battery in a small UPS unit? If you're technically skilled you might be able to modify a complete UPS unit to be a case and a charger.
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Old 3rd March 2010, 08:14 PM   #3
slam is offline slam  United States
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Something like this should do right?

Batter Jump Start | 12 Volt Battery Jump Starter Emergency Station
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Old 5th March 2010, 04:24 PM   #4
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How about the battery unit from an old battery powered hand drill?
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Old 5th March 2010, 05:47 PM   #5
trd1587 is offline trd1587  Canada
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CAn you mdify your spec so that A VTT Battery fit in it?
Otherwise you will ahve to Mod a Laptop battery
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Old 19th March 2010, 10:08 AM   #6
dangus is offline dangus  Canada
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Recharging NiCd or NiMH or LiIon is relatively complicated. Gel cells (sealed lead-acid) are much easier to charge correctly... just apply around 14 volts and limit the current. (Read the data sheet or application notes.) SLA batteries can be had in a variety of sizes; any general electronics supplier should have a selection.
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Old 20th March 2010, 04:30 AM   #7
Enzo is offline Enzo  United States
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"I can't even find a supplier of AC adaptor jacks. Any ideas? "

You mean the connector your wall wart plugs into? "DC power connector" is what they are called. If Radio Shack doesn;t have them on the wall hanging, certainly Mouser has tons. PC mount, panel mount, whatever. Typical wall wart sizes are 5.5mm Outside diameter, and 2.1mm or 2.5mm inner pin diameter.

Like this panel mount example from Mouser

And from Jameco, ever the project parts people
www.jameco.com Try these stock numbers
101178 pc mount

And while I mostly buy speaker related stuff from PArts Express, they have a selection of "DC coaxial jacks."
Parts-Express.com - Speakers, Speaker Building, Home Audio and Video, Pro Audio, Electronic Parts & Accessories PARTS EXPRESS, Speakers, Speaker Parts, Guitar speakers, Bass speakers, Woofers, Drivers, speaker upgrades and replacement speakers. Emine stock 090-479 panel mount for example

Click the image to open in full size.

Any of these would let you use a regular old wall wart for the unit most of the time, and use the power connector's cutout contact to switch over to batteries for stage use - just like the battery/adaptor function of many many effect pedals or small personal keyboards.
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Old 20th March 2010, 09:50 AM   #8
godfrey is offline godfrey  South Africa
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Have a look at the battery packs and chargers used for radio-controlled model airplanes and cars. They're compact and high capacity.
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Old 6th April 2010, 03:34 AM   #9
scid714 is offline scid714  United States
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look to the CMOY headamp it has a easy to understand section on how to have batt. and a wall wart ect..
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Old 10th April 2010, 09:27 AM   #10
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Originally Posted by forkfingers View Post
it required a 12v power supply. Any ideas?
Go find a cheap 12 Volt drill with two batteries and a Charger.

Cut the handle of the drill that has the battery terminals and mount this into your box.

You've now got a Charger, two batteries and a quick replacement strategy for when your on stage and it's not just the music that's flat
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