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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 22nd August 2013, 12:58 PM   #1471
kmajjo is offline kmajjo  France
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Default For sale : IV board

Hello Everybody,
I sell six IV boards + 6 power board and three OPA627.
Discount price.
If anyone is interested contact me.
Br
Jacky
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Old 22nd August 2013, 07:55 PM   #1472
i2k92 is offline i2k92  Indonesia
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Quote:
Originally Posted by audiodesign View Post
1) It is necessary reduce the current on shunt changing R4 and R5 from 10 ohm to 15 ohm because now the temperature of the second smd transistor is very high. Quanghao can send you the 4 x 15ohm smd resistors to make this simple correction.

2) Eliminate also R9 and R10 in the +15V and -15V shunt.

3) Add a 47uF or 100uF capacitor in parallel to the original 47uF on the 1.2V analog (L & R) near the jump to eliminate the little oscillation.
Quanghao, is it possible to apply above correction before send the dac to me. I'm afraid of sms. Thank you
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Old 22nd August 2013, 08:34 PM   #1473
judo is offline judo  Hungary
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Sorry, what are you afraid of? What does SMS mean in your sentence?
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Old 22nd August 2013, 08:57 PM   #1474
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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DAC-END R (ES9018) full assembled board
Hehe he meant SMD I think.
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Old 22nd August 2013, 09:02 PM   #1475
judo is offline judo  Hungary
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Yeah! I am not on my top today, sorry.
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Old 24th August 2013, 09:06 AM   #1476
NicMac is offline NicMac  Italy
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DAC-END R (ES9018) full assembled board
Default 115V?

I received my DAC two weeks ago, but only now had the time to give it a look.
The power cord has a US plug and the transformer (model R-30, 25VA) say 115V.....
Before plugging the DAC in at 220V I guess I'd better ask if this is fine or if some mixup has occurred
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Old 24th August 2013, 10:56 AM   #1477
palmito is online now palmito  United States
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DAC-END R (ES9018) full assembled board
Default Lundahl LL1684 hookup

I'm hooking up my ES9018 dac to Lundahl LL1684s, is post #866 the proper way? Thanks.
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Old 24th August 2013, 10:57 AM   #1478
danny_66 is offline danny_66  Belgium
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Hi NicMac,
Those R-30 transformers can be configured for 115vac or 230vac, they have dual primaries of 115vac, connected in series is for 230 vac.
I've connected the yellow-blue wire together for 230vac, the red and brown goes to the socket, see pictures.
Regards,
Danny
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Old 24th August 2013, 11:02 AM   #1479
NicMac is offline NicMac  Italy
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DAC-END R (ES9018) full assembled board
Quote:
Originally Posted by danny_66 View Post
Hi NicMac,
Those R-30 transformers can be configured for 115vac or 230vac, they have dual primaries of 115vac, connected in series is for 230 vac.
I've connected the yellow-blue wire together for 230vac, the red and brown goes to the socket, see pictures.
Regards,
Danny
Thanks danny_66,
I got the complete assembled DAC so I will have to check how it was factually wired up.
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Old 24th August 2013, 11:19 AM   #1480
danny_66 is offline danny_66  Belgium
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Hi Palmito,
I have the LL1684 hooked up like in this schematic.
Attention: the pin layout is from the bottom view (where you can see the pins), not like in the LL1684 pdf where it is the component view (where you see the label).
Regards,
Danny
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File Type: gif LL1684.gif (8.5 KB, 656 views)
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Last edited by danny_66; 24th August 2013 at 11:22 AM.
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