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

[Mike Collins]

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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