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Old 13th May 2013, 07:00 PM   #481
asdiasx is offline asdiasx  Brazil
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Hi, is it still possible to participate of this GB?
I saw people paying 50%, when is the second hlaf due?

Thanks
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Old 13th May 2013, 07:03 PM   #482
Miclaud is offline Miclaud  Italy
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Quote:
Originally Posted by danny_66 View Post
Yes, there's even a 50 page thread for it.
Thank you very much, I'm pretty new here and I didn't noticed the thread. I'm gonna read it ;-)
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Old 14th May 2013, 12:17 PM   #483
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Originally Posted by caad View Post
Hi

According to Audiodesignguide the Shunt regulators can deliver 60mA.

Each Burson HD opamp (single module) drawes 19mA according the Burson Website.

You will need 2pcs dual opamp modules : 4*19mA = 76mA..

:-(
and AD797?
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Old 14th May 2013, 10:18 PM   #484
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The AD797 is probably not so good in this circuit. See post 7 in this thread for example.

AD797 now sounds like it should
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Old 15th May 2013, 02:27 AM   #485
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Default Suitable transformer

I need to ask some advice from other participants on this list, please. I'm part-paid for:
- DAC base (without opamp I/V stage)
- Chassis
- Transformer

But I now realise it's wrong for me to use quanghao's transformer, since my own I/V stage (FET based) will require different AC voltage and higher current rating. So for the DAC base I should just buy my own 0-9VAC x2 transformer, right?

Is this 30W R-core transformer OK -
30W 220V R Core Transformer Output 9V 9V | eBay
The two secondary windings are rated at 1.7A each.

or there's a more expensive version here which is claimed to have "steel coiled silicon steel sheet and oxygen-free copper enamel wire" -
220V 30W High Quality R Core Transformer 9V 9V | eBay

Thanks.
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Old 15th May 2013, 12:15 PM   #486
Boxi80 is offline Boxi80  Italy
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Any news about the estimated time for completing the boards and shipping?
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Old 15th May 2013, 01:13 PM   #487
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Quote:
Originally Posted by linuxfan View Post
I need to ask some advice from other participants on this list, please. I'm part-paid for:
- DAC base (without opamp I/V stage)
- Chassis
- Transformer

But I now realise it's wrong for me to use quanghao's transformer, since my own I/V stage (FET based) will require different AC voltage and higher current rating. So for the DAC base I should just buy my own 0-9VAC x2 transformer, right?

Is this 30W R-core transformer OK -
30W 220V R Core Transformer Output 9V 9V | eBay
The two secondary windings are rated at 1.7A each.

or there's a more expensive version here which is claimed to have "steel coiled silicon steel sheet and oxygen-free copper enamel wire" -
220V 30W High Quality R Core Transformer 9V 9V | eBay

Thanks.
At some point, the transformer for the dac was specified as 6-9V, 1A x 2, so the tx's you picked would work.

However, for my tx, I will probably look for something closer to 6V, instead of at the 9V end. At 9 VAC in, the DAC will need to dissipate more power to regulated down to the proper voltages. More power is more heat, which tends to shorten the life of parts.

So it will work, but not what I would use.

Randy
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Old 16th May 2013, 02:47 AM   #488
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Thanks Randy. 9V seems to be the minimum value available for an R-core, so I guess I will use a toroid - an encapsulated 30W toroid, at 0-6Vx2 or 0-7.5Vx2.
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Old 16th May 2013, 02:57 AM   #489
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Quote:
Originally Posted by linuxfan View Post
Thanks Randy. 9V seems to be the minimum value available for an R-core, so I guess I will use a toroid - an encapsulated 30W toroid, at 0-6Vx2 or 0-7.5Vx2.
no!

only 0- 6VAC/ 1.5A x 2, not can use 9V for this DAC!

and 18-0-18 / 200mA min
thanks
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Old 16th May 2013, 03:37 AM   #490
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Thanks quanghao,
So I will use this 30W encapsulated toroid - 0-6VACx2 (2.5A x2)
Altronics - M4612 6 + 6V PCB 30VA Toroidal Transformer

If it's OK, please delete transformer from my order. According to the latest order list (post #372) -

16. 1 x linuxfan ( DAC base + DAC chassis + transformer)

should now be -

16. 1 x linuxfan ( DAC base + DAC chassis)
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