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#78186 06/29/10 08:36 PM
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Hi guys. Long time, no post.

I've just bought a very tasty gtr reverb from the States on eBay. It is an Electro Harmonix Cathedral Stereo Reverb. My Q.'s are in relation to the transformer required to power it and my other pedals. Because this had been purchased brand new in a box, the included transformer is a 120V AC model, whereas household power here in Australia is ~240V AC, at, I believe, 50-60 Hz.

The included transformers stated specs are:
Input: 120V AC 60Hz 0.15A
Output: 9.6V DC 200mA

I have available a number of candidate transformers, including

1. Input: 100-240V ~0.3A 50-60 Hz
___
Output : 9V ---- 1.0A This is a very common type of transformer which will power most any Boss/Ibanez/Behringer etc. stomp box.

2. Input: 240V AC 50Hz

Output: 7.5V DC 100mA This used to power a contact lens ultrasonic cleaning machine.

3. Input: 240V AC 50Hz

Output (1) 10v DC 400mA
Output (2) 8V DC 200mA This is a dual output device which used to power a cordless phone base station.

But, noting that No. 1 above has a minimum input of 100V and a maximum input of 240V, I am wondering if I could use an international power adapter to use local 240V power through the Electro Harmonix supplied US type transformer...after checking with a multimeter that the end result was actually 9V DC.

However, I don't want to fry anything inside the new pedal, or any of my others. The alternative is to buy yet another transformer of exactly the specs required by the EH pedal. Or ideally, one bigger tranformer with capacity to supply power to all of them...about half a dozen Boss/Ibanez devices including a Boss Line Selector, TU-12 tuner, Tube Screamer, the EH above and possibly a Boss '59 Bassman box coming soon.

Your opinions?

How do you guitar guys with similar power supply needs manage?

Thanks for all responses, John

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These are the key specs: 9.6V DC 200mA

That's what's needed to power the unit.

You can go with a unit that has more than 200mA, so units 1 and 3 (on the first stage) meet the current supply requirements.

However, none of them match the voltage. Likely the best one is your 3rd unit, on option 1. Most likely that will work. The slight additional voltage shouldn't make a difference.

Does the unit have ability to be powered by 9V battery? If so, then certainly the first unit would work as well.

It's o.k. that the power supplies can provide more current than your existing unit - the number shown is the current delivery capacity, but if the item being powered does not need that much current, it simply just does not use the available current.

Scott

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#1 will do the trick. MAKE SURE THE POLARITY OF THE 9VDC IS CORRECT ALSO!!!!!!!!!!!!!


John
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I wouldn't sweat 0.6V difference. Matter of fact, I wouldn't sweat +/- 2V difference.

That said, it would likely be less expensive to purchase an 8 - 10 VDC wallwart of 200mA or more that already runs on your line voltage than to mess around with adaptors.

BTW - that one with the 100 - 240VAC input is a switching supply. They typically can handle that kind of wide input variance. You should also notice that it is much lighter in weight. But comparing analog linear supplies to them is not good to do, they have transformers inside that require a *much* tighter input voltage range.

--Mac

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A friend of mine puts together batteries in a wee box and solders leads for the jack. Then he makes a dozen or so of them, thus eschewing the need for another cable on stage. I thought the idea genius for what he's doing. The alternative is a lot of duct tape. He makes the box to clip on the pedals, and changes them every gig. Measures them between and reuse if needed. He tried rechargables and says he's going to try again, they gave out too quickly.


John Conley
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I would use the "switching" Boss PSA120S; 100-240 V, 50/60Hz, output DC 9V, 250 mA (not sure here, maybe it is 500mA) (I have 2 units at home and can check latter if you need/want)
polarity is center=negative, outer sleeve=positive (this is the Roland / Boss standard)

Yamaha is just the oposite (outer is negative, center is positive) , take care...
Check YOUR pedal required polarity.

If you need/want to power ALL your effects together (that is, more than 250 mA, or so, you can use a Roland PSB-1U (input 100-240V, output 9V DC, 2000mA, center = -, outer sleeve = +)

Another trick here in some regions of Brazil (Brazil is mainly 127V) where voltage is 220V, is to use an UPS (Uninterruptible power supply ) that is 220 input, 127 output (600Watt). Very popular at northeast of Brazil , that is 220V, but all desktops are the standard 110V...
A bit heavy sugestion, though


regards, from Brazil
Luiz Dias
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