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Valve DAC from Linear Audio volume 13
Valve DAC from Linear Audio volume 13
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Old Today, 04:23 AM   #1371
SonnyMarrow is online now SonnyMarrow  United States
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Join Date: Dec 2016
I was looking at C18, but wasn't sure if it would be best to leave it or remove it.
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Old Today, 05:08 AM   #1372
acg is online now acg  Australia
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Join Date: Oct 2013
Location: Sunshine State
I think leaving it would be best unless the new power supply can offer something "faster" and very close-by, preferably only an inch or two away (i.e. no long wires), which is why I brought up the ultracaps earlier.


10uF X5R cap ESR circa 4.5mOhm...I think...tucked right in next to the load which is ideal.

vs

2 x 325F Maxwell Ultracap ESR circa 1.5mOhm each...from datasheet...3mOhm in series...a few inches of extra wire adding to the ESR...lets call it equivalent ESR to the 10uF X5R if we keep the wires very short. So no advantage to the ultracaps even though they cost $50 to implement compared to cents for the X5R.



Where the two implementations may differ is 325million times more capacitance with the ultracapacitor smashing down ripple/noise and the output impedance of the 5V power supply in parallel to the Ultracap/X5R, along with different FPGA noise which may or may not actually bring an improvement in performance of the clock/dac. That is the big question.

However, if I had your voltage regulator and wanted to use it then I would get it as close to C18 as possible without removing that cap (and of course would remove L6).

Please don't take this for gospel! I could be wrong...I'm a farmer/audio enthusiast not an electronics whiz like Marcel.

Last edited by acg; Today at 05:13 AM.
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Old Today, 05:14 AM   #1373
SonnyMarrow is online now SonnyMarrow  United States
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I planned on mounting the little PSU right under that spot (if I even do this) so the wire run would be very short.
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Old Today, 05:27 AM   #1374
acg is online now acg  Australia
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Join Date: Oct 2013
Location: Sunshine State
Yep. You may even be able to silicon it straight to the dac pcb depending on what else is in the vicinity.
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