Re: [Discuss-gnuradio] Maximum DC supply voltage for USRP

[Matt Ettus]

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, it isn't.  The USRP itself uses a linear regulator, so putting 13.8
V in will result in more than 10 additional watts being dissipated.

Also, many of the capacitors on the daughterboards are sized for 6V
input, and might blow with more than 10 V.

Matt