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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 26th July 2010, 12:48 PM   #241
tangmonster is offline tangmonster  South Africa
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ok ,son in the input ground and in is swopped on the silkscreen.

But I am not sure i understand what is going on with those two 50R resistors?
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Old 26th July 2010, 01:41 PM   #242
klaju1955 is offline klaju1955  Brazil
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Originally Posted by tangmonster View Post
ok ,son in the input ground and in is swopped on the silkscreen.

But I am not sure i understand what is going on with those two 50R resistors?
They are the catode R of V2 and V4= R32 and R50
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Old 26th July 2010, 02:11 PM   #243
tangmonster is offline tangmonster  South Africa
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Yes , but in the drawing it seems like you must not populate both but on 50R across the two ??

I guess nothing changes and only 2 must be populated?
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Old 26th July 2010, 02:24 PM   #244
johngalt47 is offline johngalt47  United States
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OLD THREAD Hi-end phono preamplifier by Andrea Ciuffoli
Default changes?

I'm starting to feel uneasy about this board. Is there anyway we can have all the changes/problems/answers in one message?
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Old 26th July 2010, 03:02 PM   #245
tangmonster is offline tangmonster  South Africa
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ME too

but so far I am building a file with a full parts list and also a list of errors.

I ordered all my parts today so early next week i will assemble.

Obviously I will assemble the power supply first.

On the previous page you can see the errors I found with the ref designators of the power supply. When I populate the parts I will double check everything and try and make a post with all my findings so that we all have one place with all the errors.

I will post my bill of materials ,it might help some people.

Note also. I did not go for the VERY expensive silver Mica capacitors.
I am going to build mine according to the RIAA circuit of the original schematic.
using 100nF and 33nf caps.

Hi-end phono preamplifier
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Old 26th July 2010, 03:41 PM   #246
klaju1955 is offline klaju1955  Brazil
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Yes , but in the drawing it seems like you must not populate both but on 50R across the two ??

I guess nothing changes and only 2 must be populated?
You mean the parallel R32a and R50a, I think Qaung Hao have let a spare
for????, perhaps additional cap...
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Old 26th July 2010, 04:47 PM   #247
tangmonster is offline tangmonster  South Africa
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no not talking about parallel

the way he has the 50R over the two resistors in series makes it confusing. don't worry , it's probably just me. Fact is you need to populate 4 x 100r to get 50r per side.
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Old 27th July 2010, 02:26 AM   #248
quanghao is offline quanghao  Viet Nam
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Default Information about the value of Phono D3A

Hello, the value of individual components in this diagram as phono 4. But Andrea has calculated value, and I did a comparison between them, the new value shows better, so the new diagram below. All the capacitors and resistors are not recorded values for an option in parallel. I'm sorry that was not clear for you to understand. Thanks

Phono 4 cricuit
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File Type: gif phono4a_sch.gif (18.7 KB, 426 views)
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Old 27th July 2010, 02:38 AM   #249
quanghao is offline quanghao  Viet Nam
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Default the new value of Phono 4

the new value of Phono 4 , i call Phono ASH
this is cricuit and PCB
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File Type: jpg Make-Phono-D3A.jpg (278.1 KB, 428 views)
File Type: jpg Cricuit-PhonoASH.jpg (313.5 KB, 426 views)
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Old 27th July 2010, 02:56 AM   #250
quanghao is offline quanghao  Viet Nam
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Default Salas for Phono D3A (ASH)

The cricuit SSHV for Phono D3A (ASH) and BOARD CONFIGURATION SETTINGS
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File Type: jpg Cricuit-SSHV-for-PhonoASH.jpg (215.0 KB, 410 views)
File Type: jpg BOARD-CONFIGURATION-SETTING.jpg (403.0 KB, 393 views)
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