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Old 7th July 2004, 09:35 AM   #1
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Talking TDA1541A PCB finish.

hi all,

I pay over two months already & now the PCBs was finished already.

Hope DIYer will like it.

I use the higher standard to build this PCB.

More information for this kit,

TDA1541A Board,
(1)contains 2 x TDA1541A, all power supply use TL431 as regulator and OS-CON cap.
(2) Both side copper plate cover for lower noise
(3) May add re-clock ckt

Tube buffer
(1) can use 6dj8 SRPP or 6c45 RC couple, can modify to using transformer couple output.
(2) use 6x4 tube rectifier, no semiconductor regulator for high volt supply

AD844 board
(1)also use TL431 as regulator
(2) can stack the board on TDA1541A board.

PCB is FR4, 2mm thick, OFC copper with 24K gold plating.

(3) Use High speed computor display card or coming DDR2 monther board graphite enclosure material. U will see this material in the coming i925X(intel chips) mother board. This material can lower the digital noise during high speed.

(4) Distance between HV,Signal path & ground area had 2mm width. This can prevent the spare bwtween the HV & ground area. Also, this OFC PCB is 2MM thickness had enough mechanical support with over 1mm OFC copper foil thickness. So the signal will run very smooth.

(5) All the hole in this monther board was 1~1.3mm diameter.
Very easy to fit size lead out tips resisters & capacitors. Then will easy to DIY.



Will post some components photo later ( ELNA cap, OS-con cap, Panasonic Puresium cap, Dale,CGW, large watt non-inductive IRC resistors......)

Hope every diyer will like it.

For more detail or advise pls email to me.

thomas@diyaudiocraft.com


Very thanks
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Old 7th July 2004, 09:38 AM   #2
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Talking Tda1541a non-o/s DAC PCB

More photos of this NON-O/S PCB.

Every set will contain two B5 size ( 1541a & Tube output stage, buffer or one step output stage) & one Cheque book size AD844 Op-amp.


Will post some components photo later ( ELNA cap, OS-con cap, Panasonic Puresium cap, Dale,CGW, large watt non-inductive IRC resistors......)


thanks

thomas
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Old 7th July 2004, 09:39 AM   #3
Electrons are yellow and more is better!
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The pcb looks nice, indeed.
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Old 7th July 2004, 09:46 AM   #4
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Talking Tda1541a non-o/s DAC PCB

Dear peranders,

this PCB is PCB is FR4 grade , 2mm thick, OFC copper with 24K gold plating. Can solder many times but the copper foils will not damage.

If U know that this factory also OEM Japan Accuphase audio PCB U will know the standard of this PCB factory.

[This PCB is not Produce in China, its produce by Taiwan computor mother board & display card Factory.

thanks

thomas
 
Old 7th July 2004, 09:50 AM   #5
Electrons are yellow and more is better!
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Gold plating, wow! Like that.

2 mm thick, why? Just cool?
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Old 7th July 2004, 10:21 AM   #6
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Talking Tda1541a non-o/s DAC PCB

dear peranders,

24K gold to make sure the surface of the signal path is very smooth for digital signal running with high fidelity result.
I think if U are me, U will same to choose this type method method to collect the better result.

why we diy? Because negotiation was exist in our heart.
So............... we need the Best, me toooooooo!

For the thickness of PCB.

Normal PCb is 1.6mm.

FR4 grade OFC audio PCB is 2.0mm to increase the mechnical strength to lower the vibration of the parts. This PCb is high density PCB.

I test a very interest for this PCB.

this is the test print of A board already. I use it to pass the lead out & test the performance of the parts. The last I added the Panasonic pureism ( audio grade with OFc lead out) caps into it.
This 50V 10uf in power supply area is very good.
Digital area use OS-con can get smooth sound. Elna-non polar is clear. Blackgate is very clear sound but I did not like it. The sound which use blackgate had the image of up-sampling DAC sound. Lost the good smell of NON-O/S detail.

Pls look my test print, the outlook of A board was be same as this one.



thanks

thomas
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Old 7th July 2004, 10:25 AM   #7
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Talking Tda1541a non-o/s DAC PCB

hi Peranders,

The dip switch of the PCB was for user to set up the standard mode & the ultra mode of the CS8414.

this PCB had I2S input, can added clock. Can choose AC or DC input.

thanks

thomas
 
Old 7th July 2004, 10:34 AM   #8
Electrons are yellow and more is better!
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Default Re: Tda1541a non-o/s DAC PCB

Quote:
Originally posted by siu sin man tho
FR4 grade OFC audio PCB is 2.0mm to increase the mechnical strength to lower the vibration of the parts. This PCb is high density PCB.
At work we have made (only once!) a 2 mm pcb and this was for a backplane and the copper was 95 um thick. This board felt very "heavy duty" if you know what I mean. I nice feeling to hold it

I know quite many like the old 1541 DAC but how about using a top-of-the-line DAC?
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Old 7th July 2004, 11:29 AM   #9
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Default Tda1541a non-o/s DAC PCB

dear peranders ,

I made a long distance call to the taiwan factory already. But now the time is 1900hrs already. The enginneer is off duty already.
We call this PCB is 2.2oz copper PCB. Standard is 2oz. So this PCB is 10% more thickness of the standard thickness. The thickness of the PCB is al least 95um than U previous made.
I choose this thickness 2.2oz because I can seperate the distance between the signal path & the ground, HV area in 2mm width to prevent the HV spark. Due to increase the thickness of the copper foil. So can increase the width between the signal path & others area still can gurantee enough signal pass the foil.

This is my opinion.

Pls see the close up of the HV & the signal path, ground area. All 2mm thickness with gold plate. The graphite enclose material is very smooth.
pls see.



thanks

thomas
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Old 7th July 2004, 11:45 AM   #10
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Talking Tda1541a non-o/s DAC PCB

Dear peranders ,

My photo taking skillful is bad.

The photos cannot reflect the real & detail of the PCB.

I know U are the moderator of this forum.
I trust that all the moderator & member of diyaudio.com is reliable person.

would U care email your address to me. I will post one set for U in your hand to see how great of this set PCB.

If U did not like this PCB. U post me back is OK.

if yes, pls email your detail to me.

thomas@diyaudiocraft.com.

thanks

thomas
 

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