[hpsdr] Starting BOM already

[Philip Covington]

Chris,

Shoot for 10 mA and 2 V drop.  10mA is plenty.

That gives 15 mW for the 150 ohm from the 3.3V supply, 33 mW for the
330 ohms for the +/- 5 supply, and 100 mW for the 1k ohms for +/- 12V
(which may be a little high - might want to shoot for 1200 - 1500
ohms).

73 de Phil N8VB

On 3/13/06, Christopher T. Day <CTDay at lbl.gov> wrote:
>
>
>
> Yeah, hence the exploding resistors, but that's what the data sheet says.
> I'll look for an alternative.
>
>
>
>
>
>  ________________________________
>
>
> From: KD5NWA [mailto:kd5nwa at cox.net]
>  Sent: Monday, March 13, 2006 3:11 PM
>  To: Christopher T. Day
>  Cc: Philip Covington; High Performance Software Defined Radio Discussion
> List
>
>  Subject: Re: [hpsdr] Starting BOM already
>
>
>
>
>
>
>
> 20ma, that seems rather high.
>
>
>  At 04:57 PM 3/13/2006, Christopher T. Day wrote:
>
>
>
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>  Looks as though I made just about all possible errors the first time.
>  Taking N8VB's corrections into account, here's a second pass at an Atlas
>  BOM for Mouser.
>
>  < http://www.hamsdr.com/personaldirectory.aspx?id=154>
>
>  Resister values are based on a 20ma operating point for the LEDs.
>
>  Please check.
>
>
>          Chris - AE6VK
>
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>  Cecil Bayona
>  KD5NWA
>  www.qrpradio.com
>
>  I fail to see why doing the same thing over and over and getting the same
> results every time is insanity: I've almost proved it isn't; only a few more
> tests now and I'm sure results will differ this time ...
>

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