Ibanez SD9 distortion oscillating

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omortier

Member
2008-01-08 10:16 pm
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?

thanks
 
The Mamps of the AC-DC power supply don´t 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.

General Guitar Gadgets has these DIY projects :

http://www.generalguitargadgets.com/index.php?option=com_content&task=view&id=135&Itemid=26

http://www.generalguitargadgets.com/index.php?option=com_content&task=view&id=134&Itemid=26

Hope that helps :)
 

unclejed613

Member
2006-12-28 12:19 am
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.
 

omortier

Member
2008-01-08 10:16 pm
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.
regards
 
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