A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input) - Page 233 - diyAudio
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Old 23rd July 2014, 01:11 PM   #2321
PET-240 is offline PET-240  Australia
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Glad the ps has come up ok.

The final current will be fine, she gonna throw out a bit of earth though!

Have some thoughts on the bass being loose but will see what happens when the shunts are fitted.

Chuz,

Drew.
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Old 23rd July 2014, 06:59 PM   #2322
eduard is offline eduard  Netherlands
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Hello Chanh,
The shop in France where we did talk about has two chokes with dual coils which can be used in common mode connection. One is rated for 2.5A and the other one is rated for 5A.
The r-core 300va 2*15 volts will take some more weeks to arrive. French people dont like to work in the summer.
Usually i will check a few times a week but youi can also ask them to send you an email once they are in stock.
The two lundahl chokes ll1694 and ll2733 have a to low current rating to be used in common mode connection in your situation.
Maybe you can get the 5A model in France when the transformer will be in stock again?
When used in common mode for choke input you can add up the two coils when you want to calculate the critical induction. So it will function the same like one 40mH on the plus side but it will filter in a better way they say.
The only thing you can do is try and tell us which one you like. I will get the 2 lundahls and an output transformer with gain and just 4 boards with shunts.
Sincere greetings, edward.
p.s if you need help i can help you order in france
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Old 23rd July 2014, 08:06 PM   #2323
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Here is some of my handy work inspired by the result you guys were getting.

My toroidal transformer (rated at 2x12V) was giving me 2x12.6v so I did some surgery to it and took off 4 turns on both secondary windings to get down to 2x12v. When powering the DDDAC with 4 board and standard regulators that resulted in 12 Vdc under load, using 2x parallel 100Ohm/10watt bleeders. The bleeders are 66C warm measured at the top (currenlty 27C ambient indoors) and only heet up the caps next to it 2C above the rest, so no problem there.

First impression sounds wise, I'm very impressed, this is a great addition, I'm glad your enthousiasme made me give it a try in the end. The sound is much more analogue/natural/easy/lucid sounding, across the frequency range detail and tone seem more balanced. The bass has more definition and I have no problem in it lacking power in anyway (like Chanh was experiencing). Still early days and the caps need more burn in time obviously.
Thanks guys,

Click the image to open in full size.

Click the image to open in full size.

Last edited by stijn001; 23rd July 2014 at 08:18 PM.
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Old 23rd July 2014, 08:17 PM   #2324
eduard is offline eduard  Netherlands
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Hello Stijn,
Listen to it some more and then try to change it into choke input using a 15 volt transformer.
Maybe you will need to '' bleed '' some more current.
Because you are using the lundahls you can try the choke input as a standard choke or as a common mode choke.
Sincere greetings, edward.
p.s the 15 volts 300va R core will probably arrive mid august. I did buy the last one.
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Old 23rd July 2014, 11:39 PM   #2325
PET-240 is offline PET-240  Australia
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Eduard,

May take you up on the order offer......

Thanks,

Drew.
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Old 24th July 2014, 09:34 AM   #2326
eduard is offline eduard  Netherlands
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Hello Drew,
You can contact Chanh so i will arrange one shipment to Australia.
Sincere greetings, Edward
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Old 24th July 2014, 09:59 AM   #2327
PET-240 is offline PET-240  Australia
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Hey Ed,

You know the funny thing is we live near enough to as far apart as we can in Australia! Which is probably close to 4000km mebbe more.

Thanks,

Drew.
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Old 25th July 2014, 11:51 PM   #2328
Chanh is offline Chanh  Australia
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Today I have finally received a response from Guido stating that my 47 Shunts are currently populating. They should be ready for a release and ship to Australia sometime early next week! Hooooray....!!!

I was particularly concern with the post payment silence at his end. As it turned out, the man is busy perfecting my order. Many thanks Guido.

With regards to Non-European order at Audio Creative Shop Audio Creative is de site voor zelfbouw audio. I have placed my new order with them, the addition 3 more Dac boards and another new main-board with SPDIF. Note the prices listed at their website are including VAT for the local. Non-European order will not be liable to local European tax at the checkout. As it turned out, the prices for these DDDAC were misleadingly listing for over continent order. When Doede ran the logistic himself, we paid 79 Euro for a DAC board kit, with Marco's proper business setup, he charges 81 Euro but with prompt response and fast order execution. For a couple more Euro, it is all well worth it and much more professionally servicing. Here not to say Doede was any less professional, he is but there can only be those many we could put in his plate. Therefore his decision to walk away from the business logistic seems logical. One thing I found to be pleasant was the mainboard with SPDIF includes Tentclock at 130 Euro ext VAT. A 19 Euro less than what I paid when the new mainboard was released, 120 Euro for mainboard, and 29 Euro for the Tentclock.

It will definitely be exciting time for me with all these mod. Hopefully the mod I done can come close to the SQ of a turntable/vinyl. Will keep you all posted when the time comes.

Best,
Chanh
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Old 26th July 2014, 09:35 AM   #2329
eduard is offline eduard  Netherlands
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Hello Chanh and the others,
The 300va R core did arrive at my door some days ago. Yesterday i did order the ll1694 and ll2733 chokes.
Want to use the ll2733 as a common mode choke input which will be a 400mH rated at 1.7A. The second filter stage will be the ll1694 which will be 160mH at 1.5A.
Because the current running through the chokes are rather big i did decide to cast the transformer and the chokes in a polyurethane compound.
The best way to shield is to use a shield with a round or oval shape. I can weld an oblong shape at work and put an oval shaped shield inside from mu metal which can be glued but not welded. Because welding will make it loose it shielding properties.
Can add a copper foil to stop other interferences as well.
It is said that especially the wires from the transformer to the diodes, first choke and caps should be short. My chassis is home made at my company so i can make something to mount the first choke on top of the transformer if i can minimize interference by magnetic fields.
I remember long time ago i did move the power transformer from underneath a turntable platter to a position just about 10 inches away. There wasnt a hum in the first place but moving it did improve low level information. So i can guess buying a gaussmeter could be a good a good investment.
My transformer has two identical secundary windings. I can put them in paralellel and using 4 diodes or use 2 diodes and put them in series and use the cetre tap as ground. Which solution will be better?
Sincere greetings, Edward
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Old 26th July 2014, 02:22 PM   #2330
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I’ve opted for parrelleling two secondary winding and 4 diode (good quality bridge diode in my case). This is the design I’ve seen the most in transistor and chip power amp PS’s (Peter Daniel's/Nelson Pass) (4 diodes but not nessesarily a bridge diode). I read an article where, when using a input choke, grounding is best done after this input choke (http://www.emissionlabs.com/datashee...plikation1.htm) . Critical in parrelleling windings is that they are of equal windings/resistance, otherwise a current will start running between them

I’ve re-jigged my PS to run as parallel input choke, second choke still in series. Even with a 15V R-core I had lying around, I’m only getting 9VDC out under load (with a 100Ohm bleeder). I’ve ordered a 2x18 10A traffo instead, in order to be able to use a lower value bleeder to draw more current.
Sound wise, first impression is that the sound is slightly more focused and separation is better, at the expense of timbre and some body/warmth. But the difference is pretty small. Input choke prevents the first caps from getting a high DC ripple so should be easier on them and prolong their life, and overall resistance of the PS is lower.

When I get the new traffo, I hope that with a decent 12Vdc output and proper loading of the chokes with a bleeder pulling more current, the choke input will be the better sounding option.

Last edited by stijn001; 26th July 2014 at 02:39 PM.
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