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Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

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Old 31st August 2010, 01:08 AM   #101
phrarod is offline phrarod  United States
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Yup. He already designed it for me and I have one on order. He'll know.
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Old 31st August 2010, 01:10 AM   #102
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Quote:
Originally Posted by parodielin View Post
OK, a phone call. What kind of transformer should I order? Does Bud make special transformer with six output for Dac End?

Thx!
look at the Old thread Dac End #1970, there is the offer of Bud, Im not good in making links, sorry
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Old 2nd September 2010, 12:16 AM   #103
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Quote:
Originally Posted by quanghao View Post
You need get 2 transfomer
R26-29 primary 115 X 2 : 0-9 X 3(0.7A); 9-0-9(0.7A)

For DAC board
You can also use 3 of these, right?

Antek - AN-0109
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Old 2nd September 2010, 08:02 AM   #104
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Hi Quanghao,

I am in the midst of building and testing the DAC board. of the 6 regulators, i can adjust the voltage to +5/-5 except for one where I can manage to get 3.85V no matter I turn the trim pot (1K).The led string is lit. The AC is 9v about 10.6 w/o load and dc at diode is 13.6. anu idea what could be wrong ? thanks
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Old 2nd September 2010, 11:20 AM   #105
lucylu is offline lucylu  England
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Found these at [url=http://www.selectronic.French supplier]
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Last edited by lucylu; 2nd September 2010 at 11:24 AM. Reason: wrong ref
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Old 3rd September 2010, 10:33 AM   #106
Yomanze is offline Yomanze  United Kingdom
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Quote:
Originally Posted by lucylu View Post
Found these at [url=http://www.selectronic.French supplier]
Yup these are what I'll be using. Great prices at 15.50EUR too.

http://www.selectronic.fr/article.as...r=10.2051-9999

Last edited by Yomanze; 3rd September 2010 at 10:36 AM.
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Old 3rd September 2010, 04:45 PM   #107
Strosek is offline Strosek  Canada
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Bud P FINALLY replied to my email (after having to send 3) and said that he'd get back to me on Friday and today is Friday... Only problem is that he was supposed to get back to me LAST Friday... I've been patient but if it's this hard to give someone your money just imagine how hard it's going to be if you ever have a problem or need support.

Antek - Is really a GREAT option! I've dealt with them in the past and purchased a good 20 transformers from them and never a single problem. They're always ready to answer questions, sell you products and provide support! As a bonus Antek is also the same company as PAR Metal and they can also supply you with a case for this project, saving time and minimizing shipping costs and best of all aggravation.

I'm starting to wish I had called Antek 3 weeks ago... I'd already have my transformers in hand and I'd be listing to this DAC by now instead of just looking at it!
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Old 3rd September 2010, 04:52 PM   #108
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Quote:
Originally Posted by tube_man88 View Post
Hi Quanghao,

I am in the midst of building and testing the DAC board. of the 6 regulators, i can adjust the voltage to +5/-5 except for one where I can manage to get 3.85V no matter I turn the trim pot (1K).The led string is lit. The AC is 9v about 10.6 w/o load and dc at diode is 13.6. anu idea what could be wrong ? thanks
Hi anyone else able to help ? Thank You.
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Old 4th September 2010, 01:10 AM   #109
BudP is offline BudP  United States
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Hi everyone,

I have finally managed to put to rest all of the alligators that have been in my way over the last 4 weeks and can turn to something that interests you. Pharod's first transformer has been laminated and tested and will be corrosion proofed over the weekend. This is a process that takes 4 days to cure. Then the assortment of pieces you see in the picture below will be put to good use.

Having located all of the materials squirreled away 15 years ago, when the Mackie 3204 mixing console was finally removed from the market, I can now actually offer a finished product. The pieces you see below are a power transformer with the primary set for 120 volts AC, core flux density of 8 KG using M6 core material and no load to full load regulation of 2%. Safety agency approval, as a professional product, under CE 6500 is the build standard. This means no one shot thermal fuse, but full creepage and clearance and 3500 volts dielectric withstand primary to secondary and core.

The rectangular metal sheet is an M6 core suppression band, the strip of copper is mounted around the coil and up over the core suppression band and the whole thing fits into the end bells and channel frame shown. The secondary leads will be separated out, by winding, with pieces of shrink tube. This is the $90 transformer, and now you know why.

I have what I consider four firm orders for this transformer and we will wind the remaining three the middle of next week, with projected shipping two weeks after winding. We have a tiny sliver of time to do this in, so, if more of you than Klaus, Daniel and Quanghao want one, in anything like a reasonable amount of time, PM me this weekend. You must tell me what voltage and frequency your particular transformer needs to run under.

Bud
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Last edited by BudP; 4th September 2010 at 01:14 AM.
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Old 5th September 2010, 02:58 AM   #110
Strosek is offline Strosek  Canada
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Quote:
Originally Posted by tube_man88 View Post
Hi anyone else able to help ? Thank You.
Make sure that your trim pot is working as it should... I've had the odd bad one over the years and your symptoms are consistant with a bad trimmer or the wrong value trimmer. Just to be safe I'd replace it!

I've just tested my board and I get all the appropriate voltages and adjustments works as they should so the circuit and values are correct.

Good luck!
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