• Disclaimer: This Vendor's Forum is a paid-for commercial area. Unlike the rest of diyAudio, the Vendor has complete control of what may or may not be posted in this forum. If you wish to discuss technical matters outside the bounds of what is permitted by the Vendor, please use the non-commercial areas of diyAudio to do so.

DAC-END R (ES9018) full assembled board

Status
Not open for further replies.
Jump to Latest
#1,601
I am confused because it did not work and then everything worked an now it do not. When turning the dac off and on the display change without any reason from time to time depending how long it have been turned off. Buttons do not work and remote not either.

When it worked it had been turned off for some hours.

Maybee to much capacitors on the supplys ?
 
#1,603
Hi Quanghao,
My wife just informed that the package is arrive. Can't wait to open it. I hope you don't forget to send the transformer with it.

Thanks a lot

Unfortunately I forgot to contact Amanero, so the DAC won't sing at least two weeks from now.
 
#1,604
quanghao said:
Hi Erlend Sæterdal!

you use code for stand by ??

If you sue big cap, it is not good for the sound! please remove it!

ok, i will sent all information for the mode, it is easy if you like it!

thanks
Click to expand...

I do not know what Code for standby means. After 4 hours turned off almost everything works. Only the Coax could not been turned on.

I wonder if it is because off bad connection to the board when burning. No gnd so the voltage came only from the other cables. I will solder a seperate thick gnd cable from LCD board to main board.

I do not agree about sound and caps .
 
#1,607
Billede 038.jpg
 
#1,615
audiodesign said:
After receiving the final version of DAC modules we have detected a very little oscillations on shunt regulators in high frequency range (about 150KHz).

Measurements and simulations made with the collaboration of CAAD allowed to find a simple solution to this problem.

To make this modifications are not necessarily required SMD components but if you want to use SMD and you have problems to find these components you can ask to Quang Hào.

1) Remove R9 on op-amp modules (as suggested before)
2) Remove R10 on op-amp modules (as suggested before)

The following modification must only be made only on +1.2V , +3,3V and +15V shunt regulators.

3) Add 100n X7R as described on attached pic -->All are X7R (better dialectric compared to U5r , Z5R etc)
4) Add 1uF X7R as described on attached pic -->All are X7R (better dialectric compared to U5r , Z5R etc)

These modifications also will reduce the temperature on the shunt of the op-amp module.

The modification as been applied on the last DAC modules sent.

See the image created by CAAD.
Click to expand...

Hi Audiodesign,

4) add 1uF X7R on the pin 1-2 OPA2134 (DAC and on op-amp modules)
3) add 0.1uF X7R on pin ? Dac and on op-amp ? 😕

Thanks!
 
Status
Not open for further replies.
Top Bottom