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Muad_zin
Copper Member
Netherlands
5 Posts |
 Posted - 12/03/2007 : 13:41:05
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| Now that I've gotten my hands on a OD-2 and HF-2 I've noticed that these pedals are ACA powered. I remember from modding a CS-3 once that you can make these pedals PSA powered by removing two components, a diode annd either a resistor or a capacitor and replace them which jumpers. Does anybody here know how you can do that with these two pedals? I think I've found the diode on the HF-2 but the OD-2 looks like a complete mystery. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 12/03/2007 : 14:46:50
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Now Corrected for OD-2
quote:
Originally posted by Muad_zin
Now that I've gotten my hands on a OD-2 and HF-2 I've noticed that these pedals are ACA powered. I remember from modding a CS-3 once that you can make these pedals PSA powered by removing two components, a diode and either a resistor or a capacitor and replace them which jumpers. Does anybody here know how you can do that with these two pedals? I think I've found the diode on the HF-2 but the OD-2 looks like a complete mystery.
Hi Muad_zin
The components that you are looking for, according to my OD-2 Schematic are:
D1 - 1SS-133 GP silicone diode.
R2 - 390 on some pedals
The diode & resistor are wired in series on the PCB.
Do not short out D2 on the OD-2, it's the protection diode.
And don't then, accidentally run your pedal off 12V or an ACA adapter.
It's best you put a small sticker on it somewhere to remind you and anyone else that is going to use your pedals.
Hope this helps
Else read the notes on running ACA pedals from a PSA adapter with a daisy chain power lead.
http://www.bossarea.com/other/aca.asp
Extract
Powering ACA pedals with a PSA power supply
Powering the older pedals designed for 12V DC input with either a newer ACA or PSA adapter will not work very well. The voltage drop over the resistor and diode will prevent the pedal from getting enough power and its LED will usually only glow faintly. The solution is to use a daisy chain and plug in another pedal designed for the newer ACA or PSA adapter. The lead between the two pedals will short the resistor diode pair and the pedal will receive full power.
Depending on the mains voltage there are 4 were versions of the ACA adapter. ACA-100, ACA-120, ACA-220 and ACA-240. The number denotes the mains voltage that the adapter should be plugged into. The 9V version of the ACA adapter has a G appended at the end of its name. Pictured is the ACA-120G which is the version sold in the USA.
Thanks to Stinkfoot for most of the information above.
Let us know how you went...
Regards Dr. Bob |
Edited by - Dr. Bob on 12/03/2007 15:17:52 |
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Muad_zin
Copper Member
Netherlands
5 Posts |
Posted - 12/06/2007 : 00:31:52
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| Well, I've done the OD-2, removed D1 and R2,then jumpered the empty sockets and it works. Now so now it's time to do the HF-2. From what I can see it looks like D10 and R64. Aore those the components to surgically strike? |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 12/06/2007 : 08:20:10
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quote:
Originally posted by Muad_zin
Well, I've done the OD-2, removed D1 and R2,then jumpered the empty sockets and it works. Now so now it's time to do the HF-2. From what I can see it looks like D10 and R64. Are those the components to surgically strike?
Hi Muad_zin
Great to hear you have moded the OD-2
Looks like you are correct for the HF-2
D10 GP silicon
R64 56 ohms on my schematic.
What was the value of R64 on your HF-2?
Remember you can leave the components on the PCB & just add a short jumper, that is the way I do it, in case anyone wants in its original state.
Good Luck, don't forget to label, that the two pedals we modified for 9V and not 12V.
Will you please take some pics of your mods, for the other members?
Regards Dr. Bob. |
Edited by - Dr. Bob on 12/06/2007 08:21:18 |
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ChristoMephisto
Platinum Member
Canada
1288 Posts |
Posted - 12/06/2007 : 14:33:01
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| Its usually the resistor/diode combo found between the input and adapter jack. Most of Boss schems are online somewhere to help take out the guess work. I still have to get around to getting some stickers like Dr.Bob suggested. |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 12/07/2007 : 07:23:02
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quote:
Originally posted by ChristoMephisto
Its usually the resistor/diode combo found between the input and adapter jack. Most of Boss schems are online somewhere to help take out the guess work. I still have to get around to getting some stickers like Dr.Bob suggested.
Hi Christo & guys
I put the sticks both inside & out on the bottom label, and one near the DC input jack, just as a precution & a reminder that it's now a PSA 9V pedal.
I just use the small 12mm sticky yellow dots that you can find at most office supply companies, you get hundreds in a box of a few $$'s
Works for me. and use a fine tipped pen.
Regards Dr. Bob
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pawnshop_trash
Gold Member
USA
603 Posts |
Posted - 12/18/2007 : 04:45:14
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this is sort of off topic, but my question probably does not warrant its own thread. I just acquired an old ACA-120 adapter (date code 9032), the first ACA series adapter I've had, as part of a trade. I know that the older ACA-120 is supposed to provide 12V DC, but its label says it provides 9V DC out (even though it is not designated "ACA-120G"). when I hooked it up to my multimeter, it read almost exactly 14V DC out. so my question is whether or not that extra 2V of headroom is normal and safe for ACA-series pedals? (I would rather not risk frying an old ACA-series pedal to find out if it's safe or not.)
a newer Boss PSA-120 adaptor provides about 9.5V DC, just like most "9V" batteries, so I expect that this ACA adpater will provide more DC voltage than needed. however, the lack of correlation between actual voltage (14V), voltage according to its label (9V), and expected voltage (12V) is confusing. if anyone has a similar-vintage/working ACA-120 adapter, and could hook it up to a voltmeter, I would appreciate it if you could post what value it reads. |
Edited by - pawnshop_trash on 12/18/2007 05:01:48 |
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pedals 4 pv
Platinum Member
Canada
1351 Posts |
Posted - 12/18/2007 : 05:10:55
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my aca-120 g reads 11vdc
my aca-120 small case reads 13vdc
the stated output on both is 9vdc |
Edited by - pedals 4 pv on 12/18/2007 05:11:54 |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 12/18/2007 : 14:24:48
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Hi Guys
You are measuring the adapters without a load.
The voltage will always be higher on an unregulated pedal, this way.
The Regulated PSA series will always measure about 9V - even without a load.
Regards Dr. Bob |
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Topic |
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ACA to PSA?
