[hpsdr] hermes

[Kevin Wheatley]

Hi Alex
12V is needed for the PA, & we've retained the 12V on the Alex/Apollo  
header for compatibility and to ease integration.
As Lyle quite rightly pointed out we're running a pair of LM317 in  
series to drop +12V to +5V.  This is for heat purposes.
73's
Kevin

On 14 Sep 2009, at 15:42, alex wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> would i be right in thinking that the power is used in the following  
> ways
>
> 12v - alex header
> 5v - 10mhz lo, pa
> 3v3d - all the digital stuff except
> 1v2d - the rest of the digital
> 3v3a - the front end
> 3v3ltc - the adc
>
> does the alex header really need the 12 volt from here or could it  
> get it from somwere else,
>
> otherwise why not use a switching regulator to get the 5 volt and  
> use linear on the analogue 3v3
>
> or run the board off 5 volt and use a dc-dc to get the 12 volt
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