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Post by Tbone81 on Oct 18, 2017 12:47:51 GMT -6
I have a FMR RNC that I inherited from a friend a while back. I don't have the power supply. Its the older 9v 500ma psu that is no longer sold by FMR. I have a line6 power supply that outputs 9v 1000ma. I tried it and it appears to work, lights up etc, but didn't run audio through it yet. I was wondering if there's any harm in running an over powered psu like this? Excessive heat with use? I'm guessing its fine but I'd love to hear from people who know more than I do about this.
Btw, I tried a 9v 400ma supply and it wouldnt work at all.
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Post by EmRR on Oct 18, 2017 13:11:10 GMT -6
no prob
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Post by svart on Oct 18, 2017 13:19:14 GMT -6
The current rating on the supply is how much it can safely source. In layman's terms, current is pulled, not pushed and the device you're powering is the part that dictates how much current is transferring in the system.
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Post by Tbone81 on Oct 18, 2017 13:42:42 GMT -6
The current rating on the supply is how much it can safely source. In layman's terms, current is pulled, not pushed and the device you're powering is the part that dictates how much current is transferring in the system. Thanks Svart, that's what I thought but I wasn't sure. |
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Post by Bob Olhsson on Oct 18, 2017 15:06:59 GMT -6
Beware that it may sound better than the stock one!
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Post by ragan on Oct 18, 2017 15:46:56 GMT -6
If the device itself were faulty, could it then draw too much current from an 'overpowered' PSU and cause issue?
Just wondering theoretically.
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Post by mulmany on Oct 19, 2017 17:47:09 GMT -6
Theoretically, yes. Depends on how well designed the unit is. Hopefully it has filtering/smoothing built in with current limiting.
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Post by EmRR on Oct 20, 2017 13:49:58 GMT -6
If the device itself were faulty, could it then draw too much current from an 'overpowered' PSU and cause issue? Just wondering theoretically. It would draw too much current from anything it was connected to, so the outcome would depend on many things. |
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Post by ragan on Oct 20, 2017 14:02:44 GMT -6
If the device itself were faulty, could it then draw too much current from an 'overpowered' PSU and cause issue? Just wondering theoretically. It would draw too much current from anything it was connected to, so the outcome would depend on many things. But if the PSU were the "correct" spec, wouldn't that not allow a faulty device to overdraw? Just wondering for my own curiosity. |
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Post by EmRR on Oct 20, 2017 14:16:32 GMT -6
The PSU can be overdrawn and melt down, regardless. Overspec PSU might not burn down, but cause more damage to device. Or it might still burn down. Too many variables. Device may have same failure state with either one. More capacity in the PSU is like more water in the well, never hurts and in some cases is known to sound better. Think of a 500 rack; there is no ability to state exact current needs, it just has to be large enough to work with a full complement of the most power hungry options, and not stress the supply through overheating. You might load the same rack with 11 devices that draw a fraction of the per module spec.
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