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Re: Convert MCA into MCA-Plus (Discussion)
Posted: 29 Apr 2020, 10:13
by oscarboiro
Hello!!! after some weeks of a lot of work at home, now i'm retourned to my hobbye.
Yesterday i take few minutes to serch components, but i have some doubts.
in the next components, i see some offers, but have different resistor values, what value is necessary?
BLM18AG (0603)
BLM18AG (0805)
BLM21AG (0805)
and, the capacitors are all to 25v? the 50v are ok?
Re: Convert MCA into MCA-Plus (Discussion)
Posted: 01 May 2020, 14:11
by Go4IT
Hey Oscar, great to know you're on it!
I put a complete BOM here in the wiki
https://mk4-wiki.denkdose.de/artikel/na ... achruesten
The resistor value for BLM are all 1 kOhm.
For the caps, any voltage above 5V should do...
Good luck!
Re: Convert MCA into MCA-Plus (Discussion)
Posted: 01 May 2020, 21:43
by oscarboiro
Thanks!! Tomorrow I can search the parts and prepare order to buy all.
When I have news I will write here!
Re: Convert MCA into MCA-Plus (Discussion)
Posted: 15 Jul 2020, 20:27
by oscarboiro
Hello, after some time disconnected and working in another proyects, today i received the last components to made this mod.
im impaciently to end work, but this mod need time and no run.
When i finish, i take a pictures of my process and result, i think everithing will be fine!!!
Thanks Go4IT, withouth your information and help this mod for me are impossible to made it.
Re: Convert MCA into MCA-Plus (Discussion)
Posted: 16 Jul 2020, 19:31
by Go4IT
Hey mate, i wish you much luck and hopefully success by first run!
Would be glad to see pictures of your work
Re: Convert MCA into MCA-Plus (Discussion)
Posted: 17 Jul 2020, 23:46
by oscarboiro
The graphics board at 99%
Only need install the oscilator, i received a wrong part and need buy another new.
The work have a good aspect, i need to improve but Iām happy with result. hope it works when i finish it.
4C316030-9421-4309-9B9B-FB5F00CF2682.jpeg
F2F8BCDD-5385-4C85-9483-767A6CAA73C3.jpeg
Thanks Got4IT
Re: Convert MCA into MCA-Plus (Discussion)
Posted: 18 Jul 2020, 12:33
by Go4IT
Well done, young Padawan!
Those resistor-arrays are hard to solder by hand, because they are so small...
I'm really excited if it works right away. Fingers crossed!
Re: Convert MCA into MCA-Plus (Discussion)
Posted: 21 Jul 2020, 16:41
by oscarboiro
Today I received the oscillator and i install it.
79C0AF39-C8AC-46A9-BDC4-C36C7FE87D32.jpeg
6B6AC256-8917-4FEC-A058-56EDE6E37654.jpeg
I put the graphic board in the unit and install service pack update.
C699AB14-99B0-45A2-A791-41592F5E25A4.jpeg
After reboot, I try the video mode. But have a little
Problem with signal. I take a video:
https://drive.google.com/file/d/15a9w6L ... GtQ4oNkvyY
Now have a lot of hot in my work space, more than 35 degrees, but tonight I go to test all new components. And I hope to find a problem.
The video input is near!!!
Thanks Go4IT!!!
Re: Convert MCA into MCA-Plus (Discussion)
Posted: 21 Jul 2020, 22:01
by oscarboiro
After some time looking all parts, i found different part un video ADC.
from instructions need ADV7181C, and i have 1x ADV7181B
I look the graphic board of NX (DVD) and have ADV7181B
no i go to dowload datasheet and search difference in the pinout etc
is possible the problem comes from wront video ADC?
Re: Convert MCA into MCA-Plus (Discussion)
Posted: 21 Jul 2020, 22:37
by Go4IT
oscarboiro wrote: ā21 Jul 2020, 22:01
from instructions need ADV7181C, and i have 1x ADV7181B
is possible the problem comes from wront video ADC?
Definitively, they ARE DIFFERENT!
"C" is needed for MCA graphicsboard to work:
diff_adv7181c_and_adv7181b.png
oscarboiro wrote: ā21 Jul 2020, 22:01
I look the graphic board of NX (DVD) and have ADV7181B
Oh boy, you should have better looked at my BOM instead... such a pitty.
Besides it's interesting to know that NX-Plus uses the B-Version, we know that the NX graphicsboard is different from MCA.
So, don't let this drag you down - Go fetch a C-Version, replace it and you are there!