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Old 25th January 2011, 08:21 AM   #1
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Default Toy1 My first time Audio DIY ... D/A.

images-2.jpg
Hand Make D/A Box
Main PCB is design for Video streaming I just take 19V adpater connect to +/-12 V ,+5V,+3.3V switching supply power to D/A.
Sub PCB is PCI Audio Card I just take SPDIF signal connect to receiver CS8416 then transfer to PCM feed WM8740 then decode Audio L/R .
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Old 25th January 2011, 11:14 PM   #2
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Toy 2 D/A Power define and verify

images-2-1.jpg
D/A Power plan defien and verify.

Last edited by asterkao; 25th January 2011 at 11:33 PM.
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Old 26th January 2011, 10:07 AM   #3
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Toy3 D/A coplue capacitor of Balance output estimate

..........check sound color
images-3.jpg
unknow PP capacitor
Sounds too rough

images-3-1.jpg
Bennic PP capacitor
Sounds not rich

images-3-2.JPG
final more sound detail then D/A balance coplue use ERO PP capacitor

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Old 27th January 2011, 11:38 PM   #4
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Default Toy 4 D/A Wolfson8740+CS8416 with 6Dj8 buffer

images-4-1.jpg
Rectifier tub is 6Z4 and voltage setup to 230V.

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Through R-C-L-C filter to 230V for E88CC anode voltage.


images-4-3.jpg
6DJ8 buffer take SRPP circuit design.


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6DJ8 cathode connect AC heater.


images-4-5.jpg
Change 6DJ8 to Mullard E88CC.

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Last edited by asterkao; 27th January 2011 at 11:58 PM.
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Old 28th January 2011, 11:44 PM   #5
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Default Toy5 Take Marantz 7 and 和田茂氏 pre-amplifier case to build D/A

images-1.jpg
Take off Marantz 7 pre-amplifier pcb and put in my D/A PCB board.
CS8416 SPDIF receiver + Wolfson WM8741 codec.
Put in switching power for D/A output OP power supply.

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Reconnect RCA optput connector wire.
Do source switching wir connect for pront panel knobes.

Images-3.jpg
Put in Mullar E88CC buffer circuit.
E88CC is SPRR structure.


Images-4.jpg
Connect E88CC plate high voltage.
E88CC use AS heater.

Images-5.jpg
Because when I finish D/A and I connect D/A behind Marantz 7 and 和田茂氏 pre-amp then the pre-amp will decay audio signal so I know pre-amp not Hi-Fi enough.
So I take off all cuircuit Marantz 7 and 和田茂氏 pre-amplifier circuit and put in my solution.

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Last edited by asterkao; 28th January 2011 at 11:53 PM.
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Old 31st January 2011, 12:29 AM   #6
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Toy10 Audio media center ... for my wife coffee shop

For More francy sound color and sound detail I DIY PCI media play card.

images-1.jpg
Diy PCI media play card with two type.
Left type use VIA VT1720T PCI Media player control + codec WM8740 + OP and buffer (could 24bits/192K @kernel streaming ).
Just depend PC performace.

Right type just use VIA VT1720T Media player control and direct SPDIF output fiber signal.

images-2.jpg
VIA VT1720T PCI Media player control + codec WM8740 + OP buffer.
This type is L/R analog output (each channel is balance output).
So I use ERO Cap. do couple and combine signal OP circuit and OP buffer.

These card need fireware code and special driver on windows XP system.
Because I prefer kernel streaming direct play wav. format music and no XP mixer to distorsion and change sample rate.
I setup working sample rate is 24bits/96K(kernel streaming mode).



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Old 31st January 2011, 11:52 PM   #7
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Audio media center

images-3.jpg
Use old PCB to hand make box for media center and this picture is front
view of media center.

Images-4.jpg
7'' LCD,CD-ROM,Optical Spdif out,Wifi build in.
PCI Media player card inside.

Images-5.jpg
LCD dislay.

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Audio media center rear view.
Hand make cooling fans and build-in switching power.

This media center is special hank-make for my wife coffee shop usage.
Because shop's cabinet is small also no play could put on display.
So I hand-make a compack media center.

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Old 6th February 2011, 01:08 AM   #8
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Toy13 D/A final version ...with output transfomer

images-1.jpg
D/A Tube buffer High voltage use R-L-C-L-C net to generate 230V for Tube 6922 plate-voltage.
Rectifier is 6Z4 and put in delay-on function.

images-2.jpg
OP is AD827AQ (dual-package)+AD797AN.
D/A output OP +15/-15V power supply by swicting power.

images-3.jpg
Spdif receiver is CS8416 and Codec is WM8741.

images-4.jpg
All circuit design usage SMT components.

images-5.jpg
The view of Audio signal switching and audio-input of tube.

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D/A Top view picture.

images-7.jpg
Mullar E88CC use SRPP structurean and use AC heat.
Add 6922 heater R & C components.

images-8.jpg
Add Tub output OPT for good sound.

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