allihts Posted August 25, 2009 Share Posted August 25, 2009 Hi, i've got three pedals powered off one 9V supply and a daisy chain power adaptor, a clever little thing that plugs into the end of the supply and offers five 9V outputs, the only thing is that whenever i use it with more than one pedal a big electrical buzz occurs, even if all the pedal are set to clean. The bass can still be heard but not well over the buzzing. is this a problem with the daisy chain or should i buy a power supply for each pedal? Quote Link to comment Share on other sites More sharing options...
Al Heeley Posted August 25, 2009 Share Posted August 25, 2009 Just bought a (cheap) 6-daisy chain 9v supply myself but not tried it yet. AC hum from cheap power supplies is well documented, advice is to spend a lot more to get a quiet one, like a Dunlop brick, but i can't justify the expense yet. It may be a contribution from the cheap parts in the unit, poor grounding or also noise in the ring mains where you're plugged in. Sorry this doesn't really help you much, I'll let you know when I get a chance to try out my fx chain next at gig volume. Quote Link to comment Share on other sites More sharing options...
dannybuoy Posted August 25, 2009 Share Posted August 25, 2009 What are the pedals? Some have a positive ground instead of negative, and they can't share the same power supply. You can get around this by using a power supply with isolated outputs (e.g. Voodoo Lab Pedal Power, BBE Supa charger, T-Rex Fuel Tank) or an isolation adaptor (e.g. Diago Isolation Adaptor, Gigrig Virtual Battery) on the daisy chain for the pedal that has the positive ground. Quote Link to comment Share on other sites More sharing options...
Mikey R Posted August 26, 2009 Share Posted August 26, 2009 (edited) [quote name='Al Heeley' post='580799' date='Aug 25 2009, 11:18 PM']AC hum from cheap power supplies is well documented, advice is to spend a lot more to get a quiet one, like a Dunlop brick, but i can't justify the expense yet.[/quote] Al, have you tried making one up yourself? Surely its just a well shielded transformer followed by a full wave rectifier and a regulator. Edited August 26, 2009 by Mikey R Quote Link to comment Share on other sites More sharing options...
Al Heeley Posted August 26, 2009 Share Posted August 26, 2009 [quote name='Mikey R' post='581370' date='Aug 26 2009, 01:43 PM']Al, have you tried making one up yourself? Surely its just a well shielded transformer followed by a full wave rectifier and a regulator.[/quote] Sounds like a good idea whilst I have the soldering iron out: [url="http://www.generalguitargadgets.com/diagrams/ss-ps4_lo.gif"]http://www.generalguitargadgets.com/diagrams/ss-ps4_lo.gif[/url] Quote Link to comment Share on other sites More sharing options...
allihts Posted August 26, 2009 Author Share Posted August 26, 2009 A behringer HB-01 wah a korg multi effects, and a behringer bsy600 synth, all negitive polarity. All pedals run just also produce a horrible electrical buzz aswell! Quote Link to comment Share on other sites More sharing options...
Mikey R Posted August 27, 2009 Share Posted August 27, 2009 (edited) [quote name='Al Heeley' post='581559' date='Aug 26 2009, 04:18 PM']Sounds like a good idea whilst I have the soldering iron out: [url="http://www.generalguitargadgets.com/diagrams/ss-ps4_lo.gif"]http://www.generalguitargadgets.com/diagrams/ss-ps4_lo.gif[/url][/quote] Do all of the outputs need to be floating WRT to each other? I guess this removes the ground polarityproblem and fixes hum caused by ground loops - nice idea, but a little bit more expensive. I was thinking something way simpler! Edited August 27, 2009 by Mikey R Quote Link to comment Share on other sites More sharing options...
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