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Author Topic: Powering two devices from one USB battery  (Read 1620 times)

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Offline voltronic

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Powering two devices from one USB battery
« on: April 26, 2015, 12:11:57 PM »
I'm curious to know if I could power a recorder and preamp both off the same USB battery.   

I own this RAVPower which has both a 1A and a 2A output: http://www.newegg.com/Product/Product.aspx?Item=0SC-000Y-00068

So far I've only used it to power my DR-70D from the 1A output.  I'm wondering if I could simultaneously power the FP24 off the 2A output, realizing the FP24 won't draw anywhere near 2A even with phantom on.

The 70D requires 5V at 1A full load.  The FP24 will accept 5-14V input, but no current specs given.

This is more of a hypothetical question and not something I really have need of, since I get great battery life in the FP24 with rechargeable AA's.  Just curious if this is possible or not.
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Offline Gene Poole

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Re: Powering two devices from one USB battery
« Reply #1 on: April 26, 2015, 10:20:25 PM »
I power my SD MP2 off a similar battery and it does just fine with 5V from a USB jack.  I haven't actually measured the current draw, but it is not very much.  The 4-cell USB supply that I have will run the MP2 for at least 12 hours with 48V phantom.  I had to make my own cable for it:


Offline ~Jon Stoppable

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Re: Powering two devices from one USB battery
« Reply #2 on: April 26, 2015, 11:24:23 PM »
The battery is rated for 3A output, which would yield four hour life at max draw.  Since your devices will draw less than that, you should be fine.

The FP24 current will vary quite a lot with phantom load and LED setting.  Worst case phantom is 1W before conversion losses, figure the whole box isn't going to do worse than 2W, which is 0.4A from a 5V supply.

Shure gives you a hint of power draw on page 5 of the user guide:  2x AA alkaline is 6Wh, so their max draw at high load is 2 hours = 3W.  Turn down the LEDs and don't use headphones, you are probably down to 2W.

Offline voltronic

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Re: Powering two devices from one USB battery
« Reply #3 on: April 27, 2015, 06:07:16 AM »
^ Thanks.  LEDs at minimum and no headphones is always how I use it.
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Offline carlbeck

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Re: Powering two devices from one USB battery
« Reply #4 on: July 26, 2015, 09:58:25 AM »
Any success with your plan to power both units from the single battery? I'm thinking of doing the same thing with my DR2D & FP24.
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Offline voltronic

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Re: Powering two devices from one USB battery
« Reply #5 on: July 26, 2015, 11:57:05 AM »
Any success with your plan to power both units from the single battery? I'm thinking of doing the same thing with my DR2D & FP24.

Actually I never got around to trying it out, as I've only run the FP24 and 70D together once, and at the time I was running the FP24 off of the rechargeable AAs.  I think the RavPower battery came with some adapter cables though - I'll have to look if one will fit the FP24.
DPA 4061 | Line Audio CM3 | Naiant X-Q
Naiant PFAs | Shure FP24
Tascam DR-70D JWMod | Sony PCM-M10

Tascam DR-70D FAQ
Team Line Audio
Quote
I am hitting my head against the walls, but the walls are giving way.    ///    If a composer could say what he had to say in words he would not bother trying to say it in music.
- Gustav Mahler

 

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