Ibanez SD9 distortion oscillating

omortier · 8th January 2008, 09:41 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

Andronico · 9th January 2008, 08:36 AM

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/...=135&Itemid=26

http://www.generalguitargadgets.com/...=134&Itemid=26

Hope that helps

unclejed613 · 14th January 2008, 06:22 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.

Brion55 · 14th January 2008, 06:36 PM

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.

omortier · 16th February 2008, 09:59 AM

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

Minion · 16th February 2008, 05:29 PM

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....

8th January 2008, 09:41 PM	#1
omortier diyAudio Member Join Date: Jan 2008	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? thanks

14th January 2008, 06:22 AM	#3
unclejed613 diyAudio Member Join Date: Dec 2006	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. __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: http://www1284177414881.v-dc.net/

14th January 2008, 06:36 PM	#4
Brion55 diyAudio Member Join Date: Apr 2005 Location: Kansas	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?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ibanez SR head thickness <>?	woodbuilder	Instruments and Amps	10	20th May 2008 08:10 PM
ibanez ts9dx	electro samurai	Analog Line Level	1	9th September 2006 04:04 PM
Ibanez PT-999	jimmi	Instruments and Amps	0	19th December 2005 03:46 PM
Ibanez Jetking 2 Jtk2	john2890	Instruments and Amps	2	2nd June 2005 12:35 PM
Ibanez TS5 to 808 mod	wilson78jr	Introductions	2	20th April 2005 01:50 AM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

9th January 2008, 08:36 AM	#2
Andronico diyAudio Member Join Date: Jun 2004 Location: Santos Lugares	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/...=135&Itemid=26 http://www.generalguitargadgets.com/...=134&Itemid=26 Hope that helps

16th February 2008, 09:59 AM	#5
omortier diyAudio Member Join Date: Jan 2008	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

16th February 2008, 05:29 PM	#6
Minion diyAudio Member Join Date: May 2006	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....

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read