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In Reply to: RE: Linear Power Supply or Battery on Mac Mini - pics posted by AbeCollins on December 21, 2014 at 18:27:01
The problem with such measurements is to come to a conclusion that relates somewhat to audio.You don't want get a better Mac Mini, first of all. I'd guess the Mini runs pretty stable.
The question is: Does the mess on the computer powerrails/ground finds its way to your DAC? Does the mess impact the DAC performance?
If so. The key question is:
What is/are the actual problem(s) of your DAC??
Edits: 12/23/14Follow Ups:
It certainly might if 'the mess' is the data being sent to the DAC.
Agree.
The measurements on the power supply are just to check that nothing is grossly wrong. I measured for wide band noise under modest steady state 1-Amp resistive load and also measured under computer load. I wanted to 'see' what a battery would look like vs the TeraDak 'audiophile' power supply.
I'll look at the output of the DAC. And of course listen for any differences. I don't have a spectrum analyzer so the basic scope will have to do.
I also have three more 12v capable power supplies that I'll look at later just for grins:
- Bench linear power supply capable of 12v @ 10-Amp
- Bench switching Power supply capable of 12v @ 20-Amp +
- Agilent Linear Lab power supply 0 - 30v @ 5-Amp*
*This one is insufficient to boot the Mac Mini. Even though the Mini draws less than 1-Amp playing music, it peaks just over 6-Amp momentarily during the boot process causing the Agilent power supply to go into current limit protection.
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