Dual mono AK4495S with AK4137 and MCU/LCD DAC kit for $160

androa76 · 2016-07-30 8:14 pm

Vulejov.
Can you tell me please where is the difference between dsd normal and dsd direct because i know you have another ak4490 board and you could switch between volume on and bypass and compare. which is better 50 or 100khz filter?
Thank you.

vulejov · 2016-07-30 8:29 pm

androa76 said:
Vulejov.
Can you tell me please where is the difference between dsd normal and dsd direct because i know you have another ak4490 board and you could switch between volume on and bypass and compare. which is better 50 or 100khz filter?
Thank you.

In blind test there is no difference between DSD filters and mods..
But, there is difference between PCM filters, someone can recognize sharp and slow filter in blind test..

vulejov · 2016-07-30 8:32 pm

kukynas said:
you need to use taobao agent, I'm using yoybuy.com, register > copy link from taobao page > order and pay for product > wait until it's delivered to their warehouse > chose and pay for transport, that's it...

Just send email to stars01, maybe seller have some answers..

xcj999 · 2016-08-01 7:14 am

i recently bought this dac pcb and am currently wondering about power supply. Would it make sense to use a sslv for the opamp section? Or is this a waste of resources?

730user · 2016-08-01 10:41 am

xcj999 said:
i recently bought this dac pcb and am currently wondering about power supply. Would it make sense to use a sslv for the opamp section? Or is this a waste of resources?

Very good board. Studer 900 went very well on the power of the digital part of the DAC!

https://shop35413239.world.taobao.com/search.htm?orderType=coefp_desc&viewType=grid&keyword=STUDER900&lowPrice=&highPrice=
MisterTao: Leading Taobao Agent - Taobao Product - ??????????? ??

xcj999 · 2016-08-01 12:24 pm

730user said:
Very good board. Studer 900 went very well on the power of the digital part of the DAC!
https://shop35413239.world.taobao.c...e=grid&keyword=STUDER900&lowPrice=&highPrice=
MisterTao: Leading Taobao Agent - Taobao Product - ??????????? ??

thanks will check it out

about the transformer ... with the psu needs that were supplied in post #76 it seems to need ~5,5W ... Any reason why the suggested tranny in the first post has 50W?

730user · 2016-08-01 1:21 pm

xcj999 said:
thanks will check it out about the transformer ... with the psu needs that were supplied in post #76 it seems to need ~5,5W ... Any reason why the suggested tranny in the first post has 50W?

I tried a simple 10W transformer for operational amplifiers. He began to warm. And the sound was worse than with more powerful tranformator.
I have a large power transformers. Transformers are connected through a pair of resistors 10 ohm 1 (or 0,5) watt. Each of them.

ozcal · 2016-08-03 11:27 am

Well that was a bad day. While wiring in a new psu some solder got on to the 4137 board and I didn't notice. On power up the magic smoke came from 2 shorted diodes killing the board and possibly the dac board too.
Now to save up another $300 au to replace the boards

kukynas · 2016-08-03 12:34 pm

Hi Grodon, that's bad to hear

xcj999, 50W is recommended as 1 bigger trany for both (AK4137 + AK4495) boards, there are power losses due to several power supply stages with pre-regulation for 9V rail so it's calculated with some spare room to be on safe side, don't think you will need more than 15W on 15V rail for opamp so you could split it into 2 tranies, one 20W 9V and one 15W 15V but you won't save much in cost and definitely it'll become bulky

730user · 2016-08-03 1:40 pm

kukynas said:
Hi Grodon, that's bad to hear

xcj999, 50W is recommended as 1 bigger trany for both (AK4137 + AK4495) boards, there are power losses due to several power supply stages with pre-regulation for 9V rail so it's calculated with some spare room to be on safe side, don't think you will need more than 15W on 15V rail for opamp so you could split it into 2 tranies, one 20W 9V and one 15W 15V but you won't save much in cost and definitely it'll become bulky

I installed in the DAC 4 separate transformer. At 30 watts.
But this is because a lot of them with me. Of the industrial equipment.

730user · 2016-08-03 1:48 pm

ozcal said:
Well that was a bad day. While wiring in a new psu some solder got on to the 4137 board and I didn't notice. On power up the magic smoke came from 2 shorted diodes killing the board and possibly the dac board too.
Now to save up another $300 au to replace the boards

You can check. Check the voltage at the control points on the DAC.
then you can xmos connecting directly to the DAC. But you need another connecting trail. In another wired.
Set the jumper to the DAC on the J2. Only. Did you enjoy the sound even more.

xcj999 · 2016-08-04 5:59 am

kukynas: thanks for letting me know. I do have a spare transformer lying around, and plenty of space in my case, so... ;-)

730user: yes, I've heard from quite a few people that very small transformers are a bad idea and can make it sound bad

ozcal · 2016-08-05 10:55 am

730user said:
You can check. Check the voltage at the control points on the DAC.
then you can xmos connecting directly to the DAC. But you need another connecting trail. In another wired.
Set the jumper to the DAC on the J2. Only. Did you enjoy the sound even more.

Thanks for the tips 730.

lehuy173 · 2016-08-06 1:08 pm

Everthing seem good, but there no sound.

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lehuy173 · 2016-08-07 2:00 am

Transformer 15VA 2x9V has burned. So we need a larger.

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ozcal · 2016-08-07 6:53 am

lehuy173 said:
Everthing seem good, but there no sound.

Sent from my iPhone using Tapatalk

Is that the standard 4118 input board? I purchased one of those boards to compare to the 4137 board and could not get audio out with my dual 4495 board. Could not get any help from the seller except to return the board.

lehuy173 · 2016-08-07 9:31 am

@ Ozcal: yes it is. It sound with optical input but after the transformer burned, dac might been damaged.

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ozcal · 2016-08-07 10:01 am

lehuy173 said:
@ Ozcal: yes it is. It sound with optical input but after the transformer burned, dac might been damaged.

Sent from my iPhone using Tapatalk

Didn't try optical ,just BNC and usb. Hope your dac is ok.

lehuy173 · 2016-08-07 2:49 pm

Thank ozcal, it sounded. You can try ak4118 board with j2,j3,j4 connected. Connect j12 for volume control. Connect J7 for PCM.

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Neslo · 2016-08-08 9:29 pm

Hi

I have finally assembled the dual AK4495 board with Pan. FM caps for dac and Silmic and AMCH caps for the analogue part with a NewclassD discrete opamp.
I have tried the AK4137 seperately and it was working with the another dac but when AK4495 is connected then no sound at all ...independent of output sample rate...
J02 on AK4137 is set and j10 and 11 is set on AK4495...
Any clues to the sound of silence?

Dual mono AK4495S with AK4137 and MCU/LCD DAC kit for $160

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