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I have a Yamaha P-140 electronic piano. Looking at its power adapter, I see the following info:

  • Input: 230V~ 50Hz 170mA
  • Output: 12V (strange symbol here, something like an equal sign =, but with dots in the lower line) 1.5A

photo of the power adapter

I have a new, massive power bank with 45000mAh that I can charge laptops with, so it has a lot of adapters. And I wonder whether it could be used to run the piano as well? Its specs:

  • Switchable output: 12V / 3A, 16V / 3A, 20V / 3A

photo of the powerbank

What do you think? To me (as an absolute newbie to this topic), the option 12V / 3A looks very close to the needed 12V / 1.5A, but maybe it would require to match perfectly? Or 3A is the max, and 1.5A would fit nicely? I really have no idea.

Joshua Muheim
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  • Welcome, questions on the usage of electronic devices are not really on topic here. We also have an established question on power adapter ratings which this will probably be closed as a duplicate of. – Chris Stratton Mar 23 '18 at 17:29
  • Possible duplicate of [Choosing power supply, how to get the voltage and current ratings?](https://electronics.stackexchange.com/questions/34745/choosing-power-supply-how-to-get-the-voltage-and-current-ratings) – Chris Stratton Mar 23 '18 at 17:29
  • Just FYI, that strange looking equals sign just indicates that the output is DC. – DoxyLover Mar 23 '18 at 18:35

1 Answers1

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Yes, it should work. The amperage of a power supply is the max current that can be drawn, but a load will only use however much current it needs. So having a 3A power supply powering a 1.5A load will work as long as the voltages are the same. The only thing left is to make sure the polarities are the same, since the piano takes a center positive barrel jack, the power bank is almost certainly the same but it's worth a quick check to be sure.

C_Elegans
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