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Topic: Wall Wart power supply question... |
Bob Carlucci
From:
Candor, New York, USA
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Posted 14 Jan 2007 6:42 pm |
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| Will I injure anything using a 7.5 v power supply on a 9 volt device ?? The 600 millivolts are what is required so that should be no problem.. It seems to work fine, but I don't want to fry my little reverb unit... any ideas?... bob |
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Greg Cutshaw
From:
Corry, PA, USA
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Posted 14 Jan 2007 8:08 pm
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I've had my Boss unit's batteries drop down to 7 volts and work fine. Some of them are internally regulated to something below 9 (9.6 with most AC adapters) volts so they won't be affected. If you can supply the 7.5 at the required 600 mA and don't get objectionable distortion or hum then you will be just fine. NO harm will come to your effects unit. This is not like an electric drill where the motor will stall and burn up from overheating at low voltage with no counter-emf!
Greg |
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Papa Joe Pollick
From:
Swanton, Ohio
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Posted 14 Jan 2007 11:52 pm
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I've had stomp boxes that actualy sounded better at lower voltages.One example is an old Small Stone.71/2 to 8 volts works good with it.Any more and it sounds kinda screechy.{for want of a better word].  PJ |
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John Daugherty
From:
Rolla, Missouri, USA
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Posted 21 Jan 2007 6:24 am
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Bob, I agree with Greg and Joe.
Most wall warts are not regulated. The output voltage will vary, depending on the load. If you measure the voltage of the 7.5v wall wart while connected to the stomp box, it will probably be near 9v. Most devices that use a 9v supply will have a regulator inside that sets the voltage at ~6v - 7.5 v.
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David Higginbotham
From:
Lake Charles, Louisiana, USA
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Posted 21 Jan 2007 8:53 am
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Please correct me if I am wrong, but it should be miliamps instead of milivolts on the requirements? Also, are you talking about a/c or d/c adaptor? Provided the adaptor is d/c and supplying at least 600 miliamps or more as required to power the unit there should be no problem. The unit will only draw the needed available current. If it is not supplying at least 600 miliamps you may cause harm in the long run. 7.5 volts or 9 volts will not be a major factor as long as the amperage is correct.
If the wal-wart is an a/c adaptor rather than d/c adaptor, that will also cause harm to the unit.
Dave |
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David Mason
From:
Cambridge, MD, USA
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Posted 21 Jan 2007 8:57 am
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| You can't hurt it using too little. There might be some undesirable distortion or misperformance if it's underloaded, depending on the effect, but it's safe to just plug it in and see. Some people even prefer that for certain things - Duane Allman played slide through a compressor with an intentionally-run down battery, and they make power supplies with variable voltage to make effects sound like they're on their last gasp. Rock & Roll being what it is, obviously a number of people have tried the opposite - running 9v stompboxes at 10, 12, 18, even 24 volts to see what they sounded like while blowing up. |
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