In Reply to: RE: Impedance mismatch posted by cb1 on September 7, 2015 at 19:53:35:
Your DAC interface receiver is momentarily losing lock - best interface jitter tolerance is obtained with a long time constant which means you can lose data with burst interruptions.
If you are able to run an optical link between your PC and the DAC, then you can determine if the issue is conducted or radiated EMI. An optical link will eliminate the electrical interaction between DAC and PC.
Impedance mismatch would result in increased interface jitter which may increase the likelihood of the DAC losing Lock, but since you say that the dropouts only occur when you switch a dimmer, this would suggest a vulnerability to EMI. Most likely this is through the power supply. This may either be coupled through from your PC which may corrupt the transmitted data through the USB adapter, or through the DAC power supply (or both!).
Do you know if the USB adapter is galvanically isolated (i.e transformer coupled)?
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
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Follow Ups
- RE: Impedance mismatch - flood2 18:27:36 09/10/15 (2)
- RE: Impedance mismatch - cb1 16:55:12 09/13/15 (1)
- RE: Impedance mismatch - flood2 20:47:21 09/13/15 (0)