TheJackedLords
Joined: Feb 11, 2018
Posts: 1
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Posted on Feb 11 2018 01:01 PM
I'm putting together an outboard box using the Surfy Industries reverb and tremolo kits. Is there any problem using One 12V power supply to power Both boards? Also, the kits' recommended power is 12V 1A. Would a 12V 1.25A power supply be okay , especially considering it's powering both boards, or would the extra amperage hurt 'em.
Thanks for any advice! I'll post a picture or two as I go. Seaweed
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j_flanders
Joined: Jun 28, 2017
Posts: 162
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Posted on Feb 11 2018 05:58 PM
No problem powering both boards with one power supply 1A or 1,25A.
Surfy Bear needs 500 to 1000mA
Surfy Trem needs 5mA.
Circuits only draw the amount of current that they need.
Power supplies don't 'push' their power/current, they only make it available.
Just make sure that the power supply can at least deliver what the pedal wants (and a bit extra as safety reserve).
It's another story when it comes to voltage. It's best to match it, you can go lower but too much can damage your circuit.
Last edited: Feb 11, 2018 18:00:02
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synchro
Joined: Feb 02, 2008
Posts: 4128
Not One-Sawn, but Two-Sawn . . . AZ.
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Posted on Feb 22 2018 10:40 AM
j_flanders wrote:
No problem powering both boards with one power supply 1A or 1,25A.
Surfy Bear needs 500 to 1000mA
Surfy Trem needs 5mA.
Circuits only draw the amount of current that they need.
Power supplies don't 'push' their power/current, they only make it available.
Just make sure that the power supply can at least deliver what the pedal wants (and a bit extra as safety reserve).
It's another story when it comes to voltage. It's best to match it, you can go lower but too much can damage your circuit.
Too little voltage can be every bit as damaging as too much. If a 9 volt pedal tries to run on 5 volts the current flowing will be 1.8x as much. The answer is to use the right voltage.
— The artist formerly known as: Synchro
When Surf Guitar is outlawed only outlaws will play Surf Guitar.
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j_flanders
Joined: Jun 28, 2017
Posts: 162
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Posted on Feb 22 2018 05:55 PM
synchro wrote:
Too little voltage can be every bit as damaging as too much. If a 9 volt pedal tries to run on 5 volts the current flowing will be 1.8x as much. The answer is to use the right voltage.
That would mean it's dangerous to use batteries with pedals...
I've never heard of a damaged pedal because the battery was depleted.
People sometimes actually use 'dead' batteries on purpose with pedals (fuzzes)
Some pedals also have a starve function/knob with which you can lower the supply voltage. There is nothing special in those circuits to protect them from the 'too low voltage'.
Heaven forbid there will be a power outage because I will be running my 9V pedals at zero volts. According to you the current will be infinte...
Also Ohms law says current would be lower (not higher) if you lower the voltage.
I'm no EE so I may be wrong, in which case I'm keen to learn from you and hear your explanation.
Last edited: Feb 22, 2018 18:06:46
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synchro
Joined: Feb 02, 2008
Posts: 4128
Not One-Sawn, but Two-Sawn . . . AZ.
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Posted on Feb 22 2018 11:17 PM
j_flanders wrote:
synchro wrote:
Too little voltage can be every bit as damaging as too much. If a 9 volt pedal tries to run on 5 volts the current flowing will be 1.8x as much. The answer is to use the right voltage.
That would mean it's dangerous to use batteries with pedals...
I've never heard of a damaged pedal because the battery was depleted.
People sometimes actually use 'dead' batteries on purpose with pedals (fuzzes)
Some pedals also have a starve function/knob with which you can lower the supply voltage. There is nothing special in those circuits to protect them from the 'too low voltage'.
Heaven forbid there will be a power outage because I will be running my 9V pedals at zero volts. According to you the current will be infinte...
Also Ohms law says current would be lower (not higher) if you lower the voltage.
I'm no EE so I may be wrong, in which case I'm keen to learn from you and hear your explanation.
You’ve got me thinking. I’m not an EE either, but I work with electrical issues frequently and nothing has burned down yet. Running devices undervolt is not good for them. The device will try to draw the power it needs and if the voltage is low it takes more current to do the work required (measured in watts). More current = more heat, and that’s never good.
With a battery, things are different. As a battery depletes, the voltage under load will sag, but if the device continues to draw power the battery will soon deplete all the way. Literally, the battery will die before it harms the device.
— The artist formerly known as: Synchro
When Surf Guitar is outlawed only outlaws will play Surf Guitar.
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