DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 171 - diyAudio
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Old 27th April 2012, 08:12 PM   #1701
apoo is offline apoo  Germany
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Hi,

could you please describe the name of the 4 pins on the AK4396 board. I´m trying unsuccesful to connect j.kenny´s hiface to the board. The MCLK (pin 3 of the AK4396) doesn´t seem to be connected...

thanx

Quote:
Originally Posted by bismuth View Post
@Giobax :
You can get I2S out of your Hiface by tapping wires, then you could try to feed directly the AKM dac on this board bypassing the I2S->SPDIF->I2S chain (hence the DIR PLL induced jitter).

With a little mod on this board (ACKS pin to HI see pic), you can also set it in auto mode for master clock.

With short coax or twisted pairs and proper grounding I think you could get good results.

A question about your shunt regulators for OPAMP rails, what capacitor values are you using on shunts and local ones to decouple OPAMP ? For now, I get weird (oscillation) results with my Salas +/-15V regs at this place...

Last edited by apoo; 27th April 2012 at 08:41 PM.
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Old 28th April 2012, 02:03 PM   #1702
Solve is offline Solve  Sweden
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What music do you listen as reference to hear differences in your mods?
And what you listen after?
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Old 28th April 2012, 05:17 PM   #1703
bismuth is offline bismuth  France
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Quote:
Originally Posted by apoo View Post
Hi,

could you please describe the name of the 4 pins on the AK4396 board. I´m trying unsuccesful to connect j.kenny´s hiface to the board. The MCLK (pin 3 of the AK4396) doesn´t seem to be connected...

thanx
Hi,
The four resistor pads are, from top to bottom, LRCK, BCK, DATA, SCK, see attached pic.
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File Type: jpg MINI4396_I2S_pinout.jpg (234.9 KB, 744 views)
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Old 30th April 2012, 03:42 PM   #1704
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I've just built my kit and it worked first time - don't laugh, for me that's good going. All the voltages check out OK but I have noticed that the 7812 runs hotter than the 7912 (45C vs 35C). Is this because the +12V from the 7812 side is also used to drive the two LM1117s? I have a spare 0-9V transformer tap that I could use to drive the LM1117s as a separate supply (a duplicate of the other existing 0-9 supply set up) and just use the 12-0-12 supply for the output opamp. It looks easy enough to break into the PCB track at that point, would that be a good thing to do?

Sorry if this has been discussed before but I'm arriving a little late to the party and trying to catch up...
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Old 30th April 2012, 08:02 PM   #1705
Solve is offline Solve  Sweden
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Quote:
I've just built my kit and it worked first time - don't laugh, for me that's good going. All the voltages check out OK but I have noticed that the 7812 runs hotter than the 7912 (45C vs 35C). Is this because the +12V from the 7812 side is also used to drive the two LM1117s? I have a spare 0-9V transformer tap that I could use to drive the LM1117s as a separate supply (a duplicate of the other existing 0-9 supply set up) and just use the 12-0-12 supply for the output opamp. It looks easy enough to break into the PCB track at that point, would that be a good thing to do?

Sorry if this has been discussed before but I'm arriving a little late to the party and trying to catch up...
I run 12-0-12 and for me its the 9v upgraded MC7809CTG regulator that goes hot.
Now i just try swapping OPA´s to hear differences.
Very small differences but they are there.
But the this DAC has more of all compare to my Super Pro Dac, also an cheap but pretty good DAC.

Its pretty easy to get a good sound but when you want more its very small objetive things to play around with.
Thats fun!
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Old 30th April 2012, 08:56 PM   #1706
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Quote:
Originally Posted by 68Spider View Post
I have noticed that the 7812 runs hotter than the 7912 (45C vs 35C).
It's normal, I suggest an heatsink in my BOM for that reason.
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Old 30th April 2012, 09:08 PM   #1707
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Quote:
Originally Posted by 68Spider View Post
I've just built my kit and it worked first time - don't laugh, for me that's good going. All the voltages check out OK but I have noticed that the 7812 runs hotter than the 7912 (45C vs 35C). Is this because the +12V from the 7812 side is also used to drive the two LM1117s? I have a spare 0-9V transformer tap that I could use to drive the LM1117s as a separate supply (a duplicate of the other existing 0-9 supply set up) and just use the 12-0-12 supply for the output opamp. It looks easy enough to break into the PCB track at that point, would that be a good thing to do?

Sorry if this has been discussed before but I'm arriving a little late to the party and trying to catch up...
Exactly what Dario mentions.

Please buy a heat sink.

You can get it at RS or Farnell.
part numbers:

RS: 189-9097
Farnell: 652469
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Old 30th April 2012, 09:58 PM   #1708
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Quote:
Originally Posted by haik View Post
Exactly what Dario mentions.

Please buy a heat sink.
I have already added heatsinks to all three regulators, it is the 7812 that runs hotter than I would like. I'll try splitting off the +Ve supply to the LM1117s from another source and see how that works out.

Quote:
You can get it at RS or Farnell.
part numbers:

RS: 189-9097
Farnell: 652469
I can't see that Farnell part number.

The other thing that is getting hot is the THS4032CD opamp I am using. I could only get it in a surface mount package and had to mount it on a DIP8 socket. Not sure what the best thing is to keep it cool.
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Old 1st May 2012, 11:04 AM   #1709
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Quote:
Originally Posted by 68Spider View Post
I have already added heatsinks to all three regulators, it is the 7812 that runs hotter than I would like. I'll try splitting off the +Ve supply to the LM1117s from another source and see how that works out.



I can't see that Farnell part number.

The other thing that is getting hot is the THS4032CD opamp I am using. I could only get it in a surface mount package and had to mount it on a DIP8 socket. Not sure what the best thing is to keep it cool.
You do not need on all three regulators. Only on one is enough.

The fact that the op-amp is getting hot, does not mean it is bad.

Try to measure the temperature, and see, if it falls in the working temperature specification of the manufacturer. What we (humans) consider "hot", maybe not hot at all for some components.
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Old 1st May 2012, 11:27 AM   #1710
VT67 is offline VT67  Belgium
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You can always use something like this:
http://www.farnell.com/datasheets/17573.pdf

Regards
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