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lexx

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  1. For those of you that are interested, I have composited together an image of the entire Issue #3 board (taken from individual shots of both sides of the board), that shows the circuit design and signal pathing. - (Complete with typo on the silkscreen !) Viewed from top: http://i652.photobucket.com/albums/uu247/borisx8/vlink-layers-view-from-top-x.jpg Viewed from bottom: http://i652.photobucket.com/albums/uu247/borisx8/vlink-layers-view-from-bottom-x.jpg
  2. Re: the Impedance mismatch: Looking at the circuit on my Issue#3 board (below): The output is fed via R12 + R13 in parallel, which equals 240ohm [2400] +110ohm [1100] = 75.429ohm The signal is then fed into a 1:1 impedance-match transformer, which provides a conjugate-match of the transmission line. While this may not alleviate all the concerns re: Impedance-mismatch, I believe it does help to clarify the design slightly. - I can only conjecture that the 50-ohm impedance number that Musical Fidelity quote is likely for the shunt-impedance value of the matching-transformer itself, and not the actual source impedance.
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