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power supply help Answered

hey I need help building a pedal brick power supply like the one here.

i could just buy one but it wouldent be as fun, and i would rather build one if any one can help or knows of a schematic with multiple 9 volt outs i would appreciate your help.

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Sandisk1duo (author)2008-06-29

tell you what i'll do, go to a good will, salvation army, shepard's gate etc.... go to the electronics section look through the adapters it should have a lot of mah like 2,000 as for the voltage, go for a 12v if you don't find one thats is the exact type, just go for the biggest mah and med-high voltage hope it helps!

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Sandisk1duo (author)Sandisk1duo2008-06-29

sorry, wrong type... i don't really know what you need tell me what it does i thought you needed a power supply

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chrischavez (author)Sandisk1duo2008-06-29

im looking into powering multiple guitar pedals. wich each needs 9 volts and each doesnt use more than 20 miliamps

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chrischavez (author)chrischavez2008-06-29

like if i could split a single 9v power supply into 5 separate 9v outs but with less current

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forgesmith (author)chrischavez2008-06-30

???

9V and 20mA. Why not just use 9V batteries? Get some clips or holders with leads and hook it up. You should be able to just mount a holder to the outside, drill a small hole to take the leads inside, and hook them to the leads running to the power jack.

Umm, we are talking 9V DC, right?

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gmoon (author)forgesmith2008-06-30

Some guys have 10 or 12 different FX pedals--with 9V batteries costing $4 or so, it's a bit much. The effects aren't all turned on at the same time. If you're a gigging musician, how do you know which battery will fail first? It's not acceptable for a pedal to just conk-out during a gig. You'd have to replace all the batteries at once, fairly often...

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forgesmith (author)gmoon2008-06-30

Rechargeables?

Oh all right...

Hey chrischavez!


Go here for the info you need. If you need any help understanding any of it, well someone will still be here to help.

Oh, P.S., Disclaimer, I take no responsibility if that site makes you want to build even more things. Or this site, far as that goes. ;-)

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gmoon (author)forgesmith2008-06-30

Rechargeables?

Er.

-- Most 9V rechargeables aren't really 9V (makes a difference with audio.)
-- Most lose charge quickly, even if not in use.
-- Takes an hour, normally, to charge each one (1 hour * # of batteries.)
-- Many musicians make "pedal boards," and the pedals are fixed in place.
-- Vintage petals, at least, have to be unscrewed to replace the batts.
-- New petals already have a plug-in power tap.

Sure, you could make an external battery pack...but you've got to plug in the amp anyway. A PS is cheaper and more convenient. Once done, it's "plugin and play..."

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gmoon (author)gmoon2008-06-30

Too much negativity here ;-)

Anyway, here's info on the LM 317 regulator and circuits, which should be a help...

Have you searched through any of the wallwarts in your home? I've got a basket of 8 or 10 from busted answering machines, phones, computer peripherals, etc. One might be 9V....

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chrischavez (author)gmoon2008-06-30

so could i just split a single 9v 50ma into 5 9v 10ma.

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gmoon (author)chrischavez2008-06-30

Yes, although I'd look for a power source in the 300 to 500mA range.

The link forgesmith provided above is very good. Pay special attention to the "snake" cable, and how that is wired.

One link off the above page is the Spyder. Ignore the bottom section (multiple transformers and regulators) and concentrate on the "ground loop" information; compare that to the "snake cable" schematic. With careful wiring you should be able to create a quiet multi-pedal supply from a single PS.

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chrischavez (author)gmoon2008-06-30

o ok thanks that helped alot.

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westfw (author)chrischavez2008-06-30

Just wire power jacks in parallel; it's more of a connector availability thing than actually isolating the supplies from each other. Probably.

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Big Bwana (author)westfw2008-06-30

take the old nine volts out and recycle them into a connector see here for a Ible on how to open a 9 Volt and solder a capacitor to filter any thing coming down the line, just keep it smaller then a 9 volt battery and it will even fit in the case ...

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Sandisk1duo (author)chrischavez2008-06-30

get a current voltage regulator that is rated for 20 miliamps
you can get free samples here. By samples i mean electronic stuff (chips and such)

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