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Re: [Discuss-gnuradio] Maximum DC supply voltage for USRP
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] Maximum DC supply voltage for USRP |
Date: |
Tue, 31 Jul 2007 13:33:57 -0700 |
User-agent: |
Mutt/1.5.9i |
On Tue, Jul 31, 2007 at 04:07:14PM -0400, Marcus Leech wrote:
> What is the maximum DC supply voltage for the USRP?
>
> I've been running it off of a 5V switched supply, but I wanted to move
> all power
> supplies outside of the USRP cabinet that I have, so I'm using an
> external 13.8V
> supply, with a LM7805 regulator. The regulator is sagging due to high
> current
> demand, so I'm thinking of supplying 13.8V directly to the USRP--is
> this safe?
No, the on board regulator can't dissipate the resulting power.
You really should feed the USRP with 6.0V, not 5.0V. Some
daughterboards take 6.0V and produce a local 5V analog supply from it.
In a pinch, you could probably feed it 5.5V, but I wouldn't go any lower.
Eric