[hpsdr] Tapr hombrew hermes need corrections for new builds (update BOM & Schematic ?)

[Gloria Koch]

Thanks guys.

I've made notes of all your replies. I'll take care of what parts
I may have mis-ordered or not ordered when I get the chance.

Just fyi for future builders...

I spent about $520 in total for the PCB and parts.

-Rick

Date: Wed, 20 Feb 2013 11:40:45 -0500
From: mikecol at tampabay.rr.com
To: stijn at pe1rks.nl
CC: n1wwq at hotmail.com; oliver.goldenstein at gmail.com; hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Tapr hombrew hermes need corrections for new builds (update BOM & Schematic ?)


  
    
  
  
    On 2/20/2013 10:39 AM, Stijn Nestra
      wrote:

    
    
      
      Hello Mike,

      

      I do agree on most of your points, except for item 101. SO8N is
      the correct outline for the board, so DigiKey number
      M25P16-VMN6TPCT-ND is correct and column D and E of the BOM are
      incorrect. VMW is not going to fit.

      

      73, Stijn

    
    Hi Stijn,

    

    Yes, thanks for the correction.  Made me run to my parts box and
    check:  luckily had ordered the VMN !!

    

    Thanks for all your inputs; they were all excellent.  You saved me a
    few more orders!!

    

    Looks like R113 is the LT3680 switching freq:  56K = 680KHz, 63.4K =
    600KHz.

    Looks like R101, 107 set the TPA0202 gain (fb):  47K would give 4.7X
    gain vs 10K values.

    Looks like R123 is the ALEX_ANT_TUNE Pull down so likely the 10K
    would be better than 0; as you noted in schem and TAPR build.

    

    73,  Mike Collins   KF4BQ

    

    

    

    
 		 	   		  
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