[hpsdr] Penelope T2 orientation - additional info

Graham / KE9H KE9H at austin.rr.com
Sat Nov 14 12:24:32 PST 2009


Bruce:
Yes, but that resistive component is what is limiting the variation
that the OpAmp output sees, and likely needs to be there.
--- Graham

Bruce Beford wrote:
> Thanks for the reply, Graham. This is what I was thinking as well (33 Ohm
> net differential load for U6). 
>
> This means that we are dissipating almost one quarter of our output power in
> R4 and R13. (33 ohms + 10 ohms total of R4 and R13 = 43 ohm load for U6)
> Since the 10 Ohm combination of R4 and R13 is about 23% of the total load,
> about 23% of the available output is disssipated there. Hmmm....
>
>
>
>   


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