DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 242 - diyAudio
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Old 3rd February 2013, 04:03 PM   #2411
goody75 is offline goody75  United States
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Default 12V Transformer Question

This is a revision to a question I asked a while back...

This DAC will be part of an opamp-based DIY preamp. If I strictly follow the plan for the DAC2496, I will need a total of 3 transformers, which seems silly to me. I have a 50VA Antek AS-0512 transformer (12-0-12, 2.1A) that I can use for the DAC's analog transformer. Can I tap the post-rectified power from the DAC to feed 6 or 8 single opamps (with their own regulators) in the preamp section?
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Old 3rd February 2013, 04:19 PM   #2412
hotiron is offline hotiron  Scotland
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You definitely need another transformer for your preamp section goody75 else the digital mush will be on your op amp power rails. By all means use one transformer if your on a budget, but leave space for an upgrade later on.

PS; you really want a 15-0-15 TX to get 15V rails for your op amps anyway.
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Last edited by hotiron; 3rd February 2013 at 04:22 PM.
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Old 3rd February 2013, 04:30 PM   #2413
bismuth is offline bismuth  France
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Quote:
Originally Posted by erin View Post
I only wish to offer my advice, and not meaning to offend, but the ADuM4160 IMO adds very high levels of jitter. If you noticed any improvement, my strong suggestion is that supplying external power is where you heard the improvement, not from the "isolation" using the ADuM4160 chip. The chip itself is very bad for audio IMO.

A much better solution is to build your own USB power cable and inject power separately. Doing it this way avoids ground loops and gives a direct connection of the data lines from PC to USB converter.

I know this as fact because I have tried the ADum4160 chip, and also used the power injected USB cable.
Your advices are very welcome ! You're right, I didn't test the separate PSU without isolation, so I cannot tell about individual benefit of isolator. Silver USB cable, hmmm...
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Old 3rd February 2013, 04:32 PM   #2414
goody75 is offline goody75  United States
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Thanks, Hotiron. It was just wishful thinking on my part.

I also have a Radio Shack transformer with the same power rating as my Antek toroidal (50VA, 12v-0-12v, 2.1A). Does anyone have an opinion on what the better location is for the toroidal transformer (DAC-analog section or preamp section)?
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Old 3rd February 2013, 05:27 PM   #2415
Max1410 is offline Max1410  Germany
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@hotrion
could you please write the discription to the colors of the wiring on your picture from the posting 2400. I wand connected a DSP with masterclock on this place.
Thanks
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Old 3rd February 2013, 05:44 PM   #2416
hotiron is offline hotiron  Scotland
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Green LRCLK
Red BCK
Violet DATA
Grey MCK
Black GND
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Old 3rd February 2013, 05:53 PM   #2417
hotiron is offline hotiron  Scotland
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Here's a tip Goody75 Whenever I see a box of discarded electronics in a skip (dumpster) I haul it home and remove the TX and any other bits I deem useful. Find a 15-0-15 TX
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Old 4th February 2013, 04:05 AM   #2418
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I'm in a bind and need your help guys...

I built 4 of these boards and 4 of the shunt regulators from the Google page. I also had built for me a 120va 15v-0-15v (30watt), 15v-0-15v (30watt), 15v-0-15v (30watt), 15v-0-15v (30watt) toroidal transformer to power it all with.

My problem is the transformer is considerably underpowered judging by the heat it produces. Does anyone know what wattage the shunt requires???

20+ hours of assembly, and I'm at a stand-still until I can get the correct power happening :-(
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Old 4th February 2013, 12:20 PM   #2419
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Ok, couldn't sleep for a bit so I did some diagnosis on my current draw issue. I found the negative output of my opamp bridge rectifiers were grounded. Transformer survived but I lost 4 of the transistors on the shunt regulators, oh well.

@Dario, in Google Doc's with the picture of the board and the drawn on schematic your circuit is incorrect for the 7912. You have it drawn with supply on pin 1, ground on pin 2, and regulated output on pin 3. The correct routing is ground on pin 1, supply on pin 2, and output on pin 3.
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Old 4th February 2013, 06:58 PM   #2420
atupi is offline atupi  Romania
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These days i've listened to Ad8066 in LPF and i must say i like it a lot. Maybe someone else can test it and say his impressions.
I'm powering the opamp separately from a shunt regulator.
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