Computer Audio Asylum

RE: Risetime-for $80 that's fine by me

87.228.210.244

fmak

In Reply to: RE: Risetime posted by audioengr on December 21, 2009 at 11:31:09

I am not going to spend $800 of my time modifying the unit. I shall rely on my dac/relocker.
Playing the thing thru, my unit sounds fine w/o the relocker.
Would you expect the wave shape posted if the cable had not been terminated?

Edits: 12/21/09

Follow Ups:

RE: Risetime-for $80 that's fine by me - audioengr 11:29:50 12/22/09 (4)
"Would you expect the wave shape posted if the cable had not been terminated?"

No, there probably would have been some overshoot and undershoot and ringing. However minimum using a HC part though.

So if you didnt use a high-impedance scope probe, did you connect it direct to the BNC 50 ohm scope input?

Steve N.
- RE:What do you think? - fmak 22:21:00 12/22/09 (3)
  nt
  - RE:What do you think? - audioengr 10:04:17 12/23/09 (2)
    If that's a yes, then this explains two things:
    
    1) the lower amplitude
    2) the slower risetimes
    
    If you have a 75 ohm series terminated transmission-line driving a 50 ohm load, that's a no-no.
    
    Steve N.
    - RE:What do you think?75R Terminated - fmak 10:23:54 12/23/09 (1)
      Why do you think anyone would terminate 75R into 50R?
      - RE:What do you think?75R Terminated - audioengr 16:07:51 12/23/09 (0)
        
        In Reply to: RE:What do you think?75R Terminated posted by fmak on December 23, 2009 at 10:23:54
        
        Because oscilloscopes only come with High-Z inputs and 50 ohm inputs, not 75 ohms. You said you were not using a probe....

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