I have had enough of wasting batteries on my two favorite pedals so I decided to pop in a few DC power jacks to run them off my daisy chain. I am terrified of the ominous 'reverse polarity' causing them to spontaneously combust so before I start playing them could anyone tell me if I have done this the right way?
The jack I have used for both pedals, and am using for my descriptions below looks like this: http://www.smallbearelec.com/Detail.bok?no=93
The Rat: I have attached the left hand lug to the PCB; the middle lug to the red (+ I presume?) lead on the battery clip; and the right hand lug to the input/output jacks, presumably grounding it. NB: On the back of the Rat, above the power supply input it says +9V - don't know if this is of relevance?
I have done much the same for the Big Muff.
I know that this is the correct way to wire up most pedals - but I have been thrown by the Rat's/Muff's reverse polarity factor, so any advice would be appreciated!
My muff consumes batteries like they're going out of style and I had a switch fitted to it to keep it off when not in use. So I recently purchased a re-charger and some batteries to stop having to hand over huge sums of cash for new batteries. :-D
Maybe this might do the trick?
However, unsure if that would work with the polarity of the muff?
Many guitarists have told me that they much prefer the sound from batteries, as the power supply, especially in venues, is often quite dirty and produces interference.
You sure you don't just need a couple of [url=http://cgi.ebay.co.uk/Adaptor-2-1mm-socket-to-1-8-3-5mm-jack-EH-Proco_W0QQitemZ370098908198QQcmdZViewItemQQptZUK_Guitar_Accessories?hash=item562b9d2c26&_trksid=p3911.c0.m14&_trkparms=72%3A1683%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50]these[/url]?! I had a double muff for a brief period and bought this to power it off my daisy chain. Now that it's sold, I just passed it onto our guitarist for powering his Big Muff. It was just straight plug and play.
Alternatively, for a fiver at your local ASDA(!), you can buy [url=http://direct.asda.com/Asda-AC/DC-Mains-Adaptor/001125515,default,pd.html]this[/url]. It'll alow you to changing voltage rating from 3-12 volts, current draw is 300mA and the polarity is switchable (depending which way round you plug in your chosen connection). Just use a daisy chain extension and a couple of the above and you're flying...big lawd.
There's a reason people pay hundreds for one of [url=http://www.voodoolab.com/pedalpower_2.htm]these.[/url] I don't know what your daisy chain is but you'd want to be careful about how many you add to it. I'd say leave 100mA at least for each small pedal. So if your power supply says 9V @ 400mA, then 4 pedals, tops.
To answer your actual question, which you've probably done yourself already now, the rat and the big muff are center positives, opposite of Boss pedals. (source: [url=http://soft.com.sg/forum/gear-guitar/68013-power-jack-proco-rat-2-a.html]rat[/url], [url=http://www.ehx.com/forums/viewthread/639/#7723]muff[/url])
That small bear picture is rather confusing. You only need to solder the + lug connections to the negative on the board and the - lug connections to the plus on the board for a standard boss supply (center negative) to work with the rat/muff. If your unsure though, just a grab multimeter and check that the voltage is going the correct way before you solder it all together! Or if you don't have a multimeter and happen to have an LED and resistor lying bout give that a go (short leg/flat side is usually to the negative).
Good luck, hope it all works out...
EDIT: If you want to learn more, a relatively easy to follow guide to pedal boards is here: [url]http://www.geofex.com/Article_Folders/Spyder/spyder.htm[/url]