F5X -- the EUVL Approach - The Build Thread - Page 45 - diyAudio
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Old 21st February 2013, 01:44 AM   #441
Horio is offline Horio  United States
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Congrats Nick!

Regarding the protection board, were there any changes you made or was it simply adjusting some of the jumpers?
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Old 21st February 2013, 03:19 AM   #442
EUVL is offline EUVL  Europe
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Some small layout bugs, and the diff pair in Nic's board is not functioning according to design.
Alexis's worked OK, so we are building a new board from scratch to cross check.

Patience.


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Old 21st February 2013, 07:48 AM   #443
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by EUVL View Post
Alexis's worked OK, so we are building a new board from scratch to cross check.
So put your trust in my poor soldering skills
As Alexis's worked OK, my soldering skills are so poor that I have even changed the PCB layout
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Old 21st February 2013, 03:53 PM   #444
Horio is offline Horio  United States
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My SMD soldering skills leaving much to be desired. I'm toying around with the idea of buying a SMD rework station and some solder paste, and trying that technique.
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Old 21st February 2013, 05:29 PM   #445
NicMac is offline NicMac  Italy
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Really not that difficult. Thin low melting point (lead containing) solder. Flux the board before each component. Thin iron tip. Magnifying glass.
Gain courage with the resistors and caps - then do the chips. For what my advice is worth.

I did also consider a smd rework station, but for that to be better I guess a lot of practice is also needed. I did get a syringe of solder paste, but I can't get it out of there I guess the pro's have some kind of pump
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Old 21st February 2013, 06:09 PM   #446
EUVL is offline EUVL  Europe
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> So put your trust in my poor soldering skills
> As Alexis's worked OK, my soldering skills are so poor that I have even changed the PCB layout

Your words against his. I don't take sides.
And such comments are not particularly productive either, if I may say so.

We shall build one ourselves and find out.
The schematics is correct; 2 people have checked it independently by hand calculation and Spice simulations.
So not design error.


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Old 21st February 2013, 08:45 PM   #447
oiphy is offline oiphy  Norway
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Quote:
Originally Posted by NicMac View Post

I guess the pro's have some kind of pump
BGA Reballing Station 40 Stencils 80mm 4 Bottles Solder Balls 100g Paste | eBay

something like this maybe??
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Old 21st February 2013, 11:33 PM   #448
NicMac is offline NicMac  Italy
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Quote:
Originally Posted by Horio View Post
Congrats Nick!

Regarding the protection board, were there any changes you made or was it simply adjusting some of the jumpers?
The jumpers is really a non-issue. You are best served by placing all of them in the ON position (towards the center of the board) to start with.
75% of the jumpers permit you to do things you would never want to do. I don't know why - but the option is there
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Old 21st February 2013, 11:46 PM   #449
NicMac is offline NicMac  Italy
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Here are a few photos.
To check the correct operation of the board I use LEDs with current limiting R in series. This gives a nice visual readout of relay behavior.
If all the jumpers are in the ON position you will find that all LEDs are ON in the SBY state and OFF in the ON state.
This assures maximum exposure of DC offset to your speakers and no music when the amp is on
Attached Images
File Type: jpg StuffedProtection.jpg (410.7 KB, 280 views)
File Type: jpg ProtectionLed.jpg (506.9 KB, 266 views)
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Old 22nd February 2013, 02:56 AM   #450
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Hi Nic,

I see a couple of relay at the speaker terminal and are not in the BOM.

1) Was there a group buy for these?
2) What are the specs?
3) Also the relay at the fuse holder, why do you need this?

4) On the control board, where are the ISR 1 & 2 connect to?
5) Why are the "On" and "Off" positions different on both sides?

On the mute image you posted earlier, I can also see 2 wires going out from the mute board.

6) To where are these connect to?

Thanks.
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File Type: jpg Relay.jpg (142.7 KB, 241 views)
File Type: jpg control board.jpg (98.1 KB, 230 views)
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