5v 2A USB supply for H5 OK?

Discuss the Zoom H6, H5, H4, H4n, H2, H2n, and H1. Please don't "post and run". Participate in the discussion. Thanks.
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Zsochs
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5v 2A USB supply for H5 OK?

Post by Zsochs » Tue Apr 25, 2017 8:32 pm

Read a couple of posts here but none of them give a definitive YES you can plug the the H5 into a 5v/2A power supply and power the unit.

1) The USB options in the unit provide for an unpowered or powered mac(without making a specification of the USB port)
2)Some say USB protocols are smart enough to only pass the amount of amperage/voltage that the end device calls for.
3)With rechargeable batteries in the unit, will powering via USB port charge the batteries?

Is there an official position on any of this?

Thanks!!
Loving my unit. I've owned an H2,H2n and H4n. The H5 is perfect.
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Zsochs
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Re: 5v 2A USB supply for H5 OK?

Post by Zsochs » Tue Apr 25, 2017 8:52 pm

Answers here seem to suggest adapters are regulated and the H5 will only draw what it needs, that the adapter will simply we sending less than it is capable of. https://www.quora.com/What-happens-when ... ated-5v-1a

I'd love to hear from anyone who has or has not blown up their Zooms circuitry charging via 5V/2A adapters or potable USB battery.
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Zsochs
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Re: 5v 2A USB supply for H5 OK?

Post by Zsochs » Tue Apr 25, 2017 8:53 pm

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Wulfraed
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Re: 5v 2A USB supply for H5 OK?

Post by Wulfraed » Tue Apr 25, 2017 9:19 pm

USB 2.0 spec is a maximum of 500mA (the 5V is a fixed amount for all USB connections) per "hub".

The power supply controls the (fixed) voltage -- the load device determines the amperage (up to the limit of the power supply).

Normal USB hubs distribute the 500mA over four ports. Some may be unable to put all the current onto one port.

If you have a supply that is providing over 500mA to a single port, it is a non-compliant charger-only power-supply (vs data ports). In any case -- a 5V 200A supply or a 5V 0.5A supply could both be used for a device that only draws <0.5A (but the losses in that that 1kW supply are going to lead to a warm room <G> 100W amateur radio transmitters run 12-13V and 22+A -- 50% loss in heat!)

The only devices I know of that "push" current are battery chargers -- and they work by raising the voltage to make the load (battery) accept the current. That is: a 12V (nominal) auto battery is charged by using a 13.8 - 14.2 V feed; you need the higher voltage to overcome the battery, but the charge current may still be rather low (a fast charger will run close to 20V or more, to push 10-20A into the battery).
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