[hpsdr] More Atlas stuff...

[Phil Harman]

Phil,

Agree about the Reply All - missed sending to the group twice already!

Your point about not fitting the ATX connector but using the aux power 
connector for board bring up is a good one.  I would prefer to keep the
-5v and +3.3v supplies since I find the 3.3v on the Xylo is very useful for 
testing the A/D chips and expect the same when testing the HPSDR boards.

Phil...VK6APH


----- Original Message ----- 
From: "Philip Covington" <p.covington at gmail.com>
To: "High Performance Software Defined Radio Discussion List" 
<hpsdr at hpsdr.org>
Sent: Sunday, March 05, 2006 9:35 PM
Subject: [hpsdr] More Atlas stuff...


> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi group,
>
> While pondering the Atlas design, please also keep in mind that not> all 
> of the components have to be populated on the Atlas board.
>
> 1. If you are only using 3 slots you do not have to put the other 3
> connectors on the Atlas until you need them.
>
> 2. If you'd rather use 64 pin type "B" DIN41612 connectors or simply a
> 2x32 0.100 header there are provisions for that (provided you don't
> need access to the YBUS signals).  You can also mix connector types.
>
> 3. The intermediate 32 pin SIP 0.100 headers do not normally need to
> be populated on the board if you are using the standard bus
> configuration.
>
> 4. If you are using the aux power connector to supply power to the
> board you do not need to populate the ATX power connector.
>
> 5. If you don't see a need for the LEDs on the power, you can leave
> them and the dropping resistors off (or some of them as the case may
> be).
>
> I like Chris's pico 12V ATX power supply - I'd like to retain the ATX
> 20 pin connector for it.
>
> Here is another thing to consider:
>
> Do we need the -5V and +3.3V power from the ATX?  If not, we can gain
> 4 more bus signals for daisy chaining.  Personally, I lean towards
> keeping the -5V and +3.3V signals.  Most of the time I re-regulate on
> plug in boards, but sometimes for prototyping it is nice to have the
> voltage s already there if you are not too concerned with power supply
> quality (noise, ripple, etc...).
>
> 73 de Phil N8VB
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