Toy1 My first time Audio DIY ... D/A.

[asterkao]

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 .

 

[asterkao]

Toy 2 D/A Power define and verify


D/A Power plan defien and verify.

 

[asterkao]

Toy3 D/A coplue capacitor of Balance output estimate

..........check sound color

unknow PP capacitor
Sounds too rough


Bennic PP capacitor
Sounds not rich


final more sound detail then D/A balance coplue use ERO PP capacitor

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[asterkao]

Toy 4 D/A Wolfson8740+CS8416 with 6Dj8 buffer


Rectifier tub is 6Z4 and voltage setup to 230V.


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



6DJ8 buffer take SRPP circuit design.



6DJ8 cathode connect AC heater.



Change 6DJ8 to Mullard E88CC.

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[asterkao]

Toy5 Take Marantz 7 and 和田茂氏 pre-amplifier case to build D/A


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.


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


Put in Mullar E88CC buffer circuit.
E88CC is SPRR structure.



Connect E88CC plate high voltage.
E88CC use AS heater.


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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[asterkao]

Toy10 Audio media center ... for my wife coffee shop

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


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.


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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[asterkao]

Audio media center


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


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


LCD dislay.


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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[asterkao]

Toy13 D/A final version ...with output transfomer


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.


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


Spdif receiver is CS8416 and Codec is WM8741.


All circuit design usage SMT components.


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


D/A Top view picture.


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


Add Tub output OPT for good sound.

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