DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 172 - diyAudio
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Old 1st May 2012, 12:30 PM   #1711
TheGimp is online now TheGimp  United States
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The THS4032CD (and all sm chips for that matter) rely on thermal conduction through the IC leads into the PWB to help dissipate power.

Since it is on a DIP8 socket and has wires replacing the pads, they probably do not conduct heat as well.

Put a heat sink on it. Seriously, tacpac a small piece of copper foil (or even heavy duty Aluminum foil) bent in an L shape to act as a heat sink. The opamp will stay cooler.
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Old 1st May 2012, 04:58 PM   #1712
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Quote:
Originally Posted by haik View Post
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.
Agreed, the regulators at 35C and 45C and the op-amp at 50C are well within spec. But my experience of electronics is that higher temps lead to shorter working life.

Quote:
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.
I'd much rather spend a few pence on extra heat sink capacity than have something break and require time and have to spend pounds to fix in the future.
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Old 2nd May 2012, 11:04 AM   #1713
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Originally Posted by dtses View Post
I've got the parts for PS finally and curious now, is it safe to omit U6 at all, I mean if I stay with simple shunt from Dario (LM317+BD139+zener) could I directly feed CS8416 A+3.3 bearing in mind voltage peaks during switching on/off the dac?
hi Dario,

could I have piece of your advice once more please?

Regarding your shunt, if I replace both regs (U9 and U6), do I need to keep C21 and C34 caps?
Also if I replace only U9 (as I've done now), should it be connected directly to U6, thus omiting C14 & C38?

I've used 8.2V zenner with LM317 and got exactly 8.2vdc, so no need to add 0.6v calculating output voltage, am I right?
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Old 2nd May 2012, 11:30 AM   #1714
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I tried direct out to a pair of Monacor LTR-110 and cant hear
any differnces compared to OPA out.
Maybe my ears are bad or the rest of my eqipment is to cheap.
Run it thrue TA2020 and TABAQ speakers.
Does it need any load the transformer?
Just have it straight coupled now.
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Old 2nd May 2012, 04:57 PM   #1715
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Default Hole centres to mount board

Hello everyone,

I've ordered one of these boards and wondered if anyone has the dimensions of the mounting holes to hand. I'd like to get on with bashing some holes in a case whilst I wait for delivery.

Thanks

Tony
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Old 2nd May 2012, 09:36 PM   #1716
Piersma is offline Piersma  Netherlands
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Default Finished MINI DAC

My finished MINI DAC with Walt Jung regulators for analog 5V, 3.3V digital and +/- 15V analog supply for the OPA2604 output filter.

regards,
Piersma
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File Type: jpg MINI DAC-2.jpg (88.1 KB, 550 views)
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Old 2nd May 2012, 10:01 PM   #1717
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Quote:
Originally Posted by dtses View Post
Regarding your shunt, if I replace both regs (U9 and U6), do I need to keep C21 and C34 caps?
If you mounted an elco in C3, probably not but it could sound better with them.

You should try.

BTW why do you want to replace CS8416 analog PS?

Quote:
Originally Posted by dtses View Post
Also if I replace only U9 (as I've done now), should it be connected directly to U6, thus omiting C14 & C38?
C38 can be omitted but why would you omit also C14? IMHO it's needed to decouple the opamp, particularly with an external regulator.

Did you replaced also U10, right?

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Originally Posted by dtses View Post
I've used 8.2V zenner with LM317 and got exactly 8.2vdc, so no need to add 0.6v calculating output voltage, am I right?
No, there's something wrong, maybe you burned the BD139.

Can you post a schema of what you did?

My simple shunt has two sections: a current regulator (LM317 + current setting resistor) and zener+resistor+transistor as the real shunt.
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Old 2nd May 2012, 10:06 PM   #1718
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@Piersma

Are those "Gold Mini Regulators"?

Regards
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Old 2nd May 2012, 10:15 PM   #1719
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Yes, they are!
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Old 2nd May 2012, 10:19 PM   #1720
VT67 is offline VT67  Belgium
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I also had the same idea of using those on my second board I ordered. (just to compare)
I just have to source the parts for the bipolar board though.

Regards
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