Beno Posted March 12, 2011 Share Posted March 12, 2011 Evenin all. I have a BD 21 Bass driver and as normal its a 9v DC. Its very heavy on batteries so I had a scope in my bits box and found a 9v power supply (9v printed on the unit). Its from a pair of puter speakers.'Result' I thought. I checked the secondary voltage with a meter and it reads 13.3v DC Q. Will this damage my pedal. I figure there is a +/- tolerance, but 50% ? If someone could check their volts on the output of a PS I'd appreciate it. Thanks, B (dunno if this should have gone in tech section) Quote Link to comment Share on other sites More sharing options...
pantherairsoft Posted March 12, 2011 Share Posted March 12, 2011 I don't have my supplies etc here at home but I'm pretty sure most 9v pedals can take up to 12v (although not all sound like they like it). I'm sure there was a thread some time ago where someone pushed a Boss ODB-3 over 12v and basically destroyed it... Shep Quote Link to comment Share on other sites More sharing options...
Beno Posted March 12, 2011 Author Share Posted March 12, 2011 (edited) [quote name='pantherairsoft' post='1159840' date='Mar 12 2011, 08:49 PM']I don't have my supplies etc here at home but I'm pretty sure most 9v pedals can take up to 12v (although not all sound like they like it). I'm sure there was a thread some time ago where someone pushed a Boss ODB-3 over 12v and [b]basically destroyed it...[/b] Shep[/quote] Yeah, thats my concern. I think I'll try fitting a resistor or something in line to get the v down a bit. Cheers. EDIT. That resistor thing was a disaster so I'd still like to hear from anyone Edited March 13, 2011 by Beno Quote Link to comment Share on other sites More sharing options...
dannybuoy Posted March 18, 2011 Share Posted March 18, 2011 Get a new power supply, it's not worth the risk. As well as pouring too much voltage in, the polarity could be wrong, pedal supplies tend to use reverse positive / negative setup to most other devices. I recommend this one, it'll have enough juice to power a whole board full of pedals via a daisy chain if you decide to get more later: [url="http://www.johnnyshredfreak.com/store/index.php?main_page=product_info&products_id=12"]http://www.johnnyshredfreak.com/store/inde...;products_id=12[/url] Quote Link to comment Share on other sites More sharing options...
Beno Posted March 18, 2011 Author Share Posted March 18, 2011 [quote name='dannybuoy' post='1166637' date='Mar 18 2011, 07:48 AM']Get a new power supply, it's not worth the risk. As well as pouring too much voltage in, the polarity could be wrong, pedal supplies tend to use reverse positive / negative setup to most other devices. I recommend this one, it'll have enough juice to power a whole board full of pedals via a daisy chain if you decide to get more later: [url="http://www.johnnyshredfreak.com/store/index.php?main_page=product_info&products_id=12"]http://www.johnnyshredfreak.com/store/inde...;products_id=12[/url][/quote] Good link that, I'll have to get a few more bits to spread the postage costs. Cheers Quote Link to comment Share on other sites More sharing options...
chrismuzz Posted March 18, 2011 Share Posted March 18, 2011 I've got one of those Johnny Shredfreak supplies, I power 7 pedals off it with no issues, no noise whatever. You'll be more than happy with it Quote Link to comment Share on other sites More sharing options...
OzMike Posted March 19, 2011 Share Posted March 19, 2011 [quote name='Beno' post='1159782' date='Mar 12 2011, 10:07 PM']Evenin all. I have a BD 21 Bass driver and as normal its a 9v DC. Its very heavy on batteries so I had a scope in my bits box and found a 9v power supply (9v printed on the unit). Its from a pair of puter speakers.'Result' I thought. I checked the secondary voltage with a meter and it reads 13.3v DC Q. Will this damage my pedal. I figure there is a +/- tolerance, but 50% ? If someone could check their volts on the output of a PS I'd appreciate it. Thanks, B (dunno if this should have gone in tech section)[/quote] Sounds like you've got an unregulated 9VDC supply. Unregulated -> the output voltage varies with load. Measuring with a meter means almost no load, and a higher voltage; if you plug it into the pedal the load could be such that the resultant voltage ends up around 9V. Unregulated supplies can often cause a lot of hum in your output signal, and are best avoided. But you could probably fit a 9V regulator + a couple of caps to what you have and end up with a regulated power supply that's as good as many store-bought units. Quote Link to comment Share on other sites More sharing options...
Beno Posted March 22, 2011 Author Share Posted March 22, 2011 [quote name='OzMike' post='1168113' date='Mar 19 2011, 12:02 PM']Sounds like you've got an unregulated 9VDC supply. Unregulated -> the output voltage varies with load. Measuring with a meter means almost no load, and a higher voltage; if you plug it into the pedal the load could be such that the resultant voltage ends up around 9V. Unregulated supplies can often cause a lot of hum in your output signal, and are best avoided. But you could probably fit a 9V regulator + a couple of caps to what you have and end up with a regulated power supply that's as good as many store-bought units.[/quote] Thanks OzMike. Think I'll go the new route. Life's too short Quote Link to comment Share on other sites More sharing options...
xgsjx Posted March 22, 2011 Share Posted March 22, 2011 just a note, make sure the new PSU supplies enough mA to feed it. I'd suggest making sure it's more than you need. Quote Link to comment Share on other sites More sharing options...
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