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sp-1
Platinum Member
Germany
1454 Posts |
 Posted - 07/25/2007 : 21:34:49
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I guess this is the most FAQ, here we go :
Can I use a aca pedal with a psa adaptor ? |
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mattoqua
Silver Member
Canada
438 Posts |
Posted - 07/26/2007 : 01:05:03
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Yes! 
Just make sure its daisy chained with another pedal.
If it's the only pedal plugged in with the PSA, it will not function fully. If there is at least 1 other pedal plugged in with the same PSA, it will work
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stinkfoot
Silver Member
Sweden
181 Posts |
Posted - 07/26/2007 : 16:25:32
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The long story can be found here, if you're interested in a more in-depth explanation.
ACA pedals produced prior to 1997 require 12 volts DC on the adapter input. The 12 volts are then reduced to about 9 volts inside the pedal, via a resistor and a silicon diode on the negative side of the power supply input.
ACA pedals produced after 1997 require 9 volts DC on the adapter input, and are therefore fully compatible with the PSA supply.
To make your old-style ACA pedal work with a power supply, you can either:
- run it off a separate 12 volt supply (don't go out and buy the current Boss ACA adapter, though, as it too was changed to 9 volts in 1997)
- modify the pedal internally, to defeat the resistor/diode network. This is done either by routing the adapter jack negative wire straight to ground, or (as Boss did it) by taking out the two components and replacing them with jumpers.
- power the pedal from a daisy-chain style (common ground) power supply, together with at least one PSA or post-1997 ACA pedal. Once you connect the signal cables between them, the old-style ACA pedal will receive full power from the 9 volt source.
To test if your ACA pedal is pre or post 1997, simply power it alone from a PSA or similar supply. If the LED lights up at least as much as with a battery, it is either a post-1997 pedal, or has been modified to those specs. Use it as you would any other pedal.
If it barely lights up at all on adapter power, the pedal is pre 1997. Refer to the above list.
/Andreas |
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stinkfoot
Silver Member
Sweden
181 Posts |
Posted - 10/16/2007 : 15:59:08
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Don't forget that the ACA adapter changed too in 1997. Earlier ACA adapters were 12 volts DC unregulated (to work with the ACA pedals of that time), while newer ACA adapters (produced after mid 1997) are 9 volts DC unregulated (to work with the ACA pedals produced after 1997).
...which more or less makes the modern ACA adapter useless. You can't use it to power your pre-1997 ACA pedal (which would need a different adapter, if powered alone), as it is only 9 volts DC instead of the 12 volts the pedal wants to see. And while it will work fine with the post-1997 ACA pedals, so will the regulated PSA adapter. So... 
It would have been better if Boss had labeled the post-1997 ACA pedals with PSA stickers, left the ACA adapter at 12 volts, and specified it for use only with pedals labeled "ACA" (i.e. earlier models). In my humble opinon, that is 
Edit: Um... actually, I just bought a brand new SD-1 for a customer, and it is indeed marked "PSA adaptor only". Which makes the change in output voltage from the ACA adapter all the more dumb - since the only pedals that require it are the old ones... the ones the modern 9 volt ACA adapter will not work properly with...
/Andreas |
Edited by - stinkfoot on 10/23/2007 17:12:59 |
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pedals 4 pv
Platinum Member
Canada
1351 Posts |
Posted - 01/19/2008 : 00:27:53
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| I purchased the new PSA-120S 500ma supply from Boss and I thought that I would try a single ACA pedal, with this supply. I tried 2 different ACA pedals (CE-2 and HM-2). The LED doesn't even glow dim. The signal will pass through the pedal when plugged in but no effect is produced, and the pedal acts like it is not turning on at all.The pedals all work great in a chain when powered by the PSA-120S, I'm using it to power 9 and a mini mixer with no problems. |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 01/19/2008 : 21:31:27
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On the Ce-2, jumper D5 and R52 470ohms,
Not sure which ones it is for the HM-2, at the moment.
Some suggest to leave the diode in for protection |
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pedals 4 pv
Platinum Member
Canada
1351 Posts |
Posted - 01/19/2008 : 22:40:49
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| It works fine on a daisy chain, and I wont be using it stand alone so I'll just leave it the way it is for now. Thanks for the info tho. |
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verivorax
Platinum Member
Canada
1185 Posts |
Posted - 03/11/2008 : 05:40:38
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| Isn't it misleading for Boss to sell (before 1997, anyway) a product labelled 9v which outputs 12v? |
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bossFan
Bronze Member
Portugal
97 Posts |
Posted - 03/11/2008 : 14:23:54
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quote:
Originally posted by verivorax
Isn't it misleading for Boss to sell (before 1997, anyway) a product labelled 9v which outputs 12v?
12V Unregulated and without load.
9V with load (Ex. CE-2)
Electronics 101.. |
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RonNovy
Copper Member
USA
24 Posts |
Posted - 03/15/2008 : 14:02:01
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quote:
Originally posted by ChristoMephisto
On the Ce-2, jumper D5 and R52 470ohms,
Not sure which ones it is for the HM-2, at the moment.
Some suggest to leave the diode in for protection
Arg! If you jumper D5 make sure you don't have a battery plugged in while the power adapter is plugged in...
And what is this about R52 to 470ohms? |
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tazzboy
Copper Member
USA
46 Posts |
Posted - 06/10/2008 : 01:16:13
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| I just got done talking to boss and they said for $20 (parts and labor) + shipping Boss will convert your pedal from ACA to PSA if want to have a PSA power adapter. |
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Laurie
Double Platinum Member
Canada
4854 Posts |
Posted - 06/10/2008 : 01:36:47
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quote:
Originally posted by tazzboy
I just got done talking to boss and they said for $20 (parts and labor) + shipping Boss will convert your pedal from ACA to PSA if want to have a PSA power adapter.
Welcome tazzboy!!
Or you can do it yourself for nothing (if you own a soldering iron).
There are no "parts" required. |
Edited by - Laurie on 06/10/2008 01:38:09 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 06/10/2008 : 09:40:15
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Hi tazzboy
Welcome to the forum from Australia.
Regards Dr. Bob |
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tazzboy
Copper Member
USA
46 Posts |
Posted - 06/11/2008 : 21:57:32
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Thanks.
I didn't ask weather or not you can get the parts directly or not.
Sorry |
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DeFrag
Moderator
USA
3409 Posts |
Posted - 06/11/2008 : 22:29:40
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Welcome to Bossarea tazzboy!  |
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stevedlcs
Copper Member
1 Posts |
Posted - 09/18/2008 : 04:16:33
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Hi
Besides jumpering the 470 ohm resistor and diode, what does Boss recommend doing to the pedals to convert them from ACA to PSA?
Thanks!
Steve |
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Topic |
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ACA pedal with PSA adaptor
