Ibanez SD9 distortion oscillating - diyAudio
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Old 8th January 2008, 09:41 PM   #1
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Default Ibanez SD9 distortion oscillating

Hi there.
I own a ibanez SD9 green pedal. I really love the sound of that pedal, but I've an oscillation problem when it is powered from an AC to DC adaptor.
A real hi frq is generated. I've read somewhere that a 1000 Ma adaptor may be too much and may be the reason why it is oscillating.
Any idea, I'm stuck?

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Old 9th January 2008, 08:36 AM   #2
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The Mamps of the AC-DC power supply donīt produce the oscillation. If the pedal works well with a battery, the problem is that the AC-DC adaptor is not regulated or is poorly filtered or both. Is very important that the adaptor you use for your pedals will be a good quality one.

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Hope that helps
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Old 14th January 2008, 06:22 AM   #3
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my guess would be dried out filter caps in the wall wart if it even has any. the filter caps on these little pains-in-the-neck dry out rather quickly, since wall warts are usually made with no cooling slots and they spend a lot of time plugged in generating internal heat, even when they're not being used.
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Old 14th January 2008, 06:36 PM   #4
Brion55 is offline Brion55  United States
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Some so-called "DC" wall warts have rectification only and little or no filtering. Might try putting a 100mfd electrolytic and .01 parallel to it from B+ to ground in the pedel to see if that shuts it up.
How do I put the smoke back in this thing?
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Old 16th February 2008, 09:59 AM   #5
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Thanks for your comments.
I've tried with differents AC/DC adaptor, all my otehrs pedals are fine with the PSU I use with my true bypass system.
I think that effectivelly, my next step will be to change the electrolytic Caps. The trouble is that all the schematics I've found on that pedal (PCB MP-SD 1301A) are not corresponding to the components list and looks only modded things.
If someone has the schem, it would be really cool.
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Old 16th February 2008, 05:29 PM   #6
Minion is offline Minion  Canada
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You can simply Solder a 100uF Cap across the +v terminal to the Ground terminal and there you have extra PSU Filtering, You could probably solder it directly on the Pedals Power input jack or on the bottom of the PCB at the power input....

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