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Old 13th April 2013, 01:33 AM   #1
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Default My_Ref Fremen Edition - Build thread and tutorial

This build thread associated with this GB:

My_Ref Fremen Edition Interest/Group Buy

On the project's Google Drive folder it's available a PDF version of the tutorial, in addition to schematic, BOM, etc..

Also on 7/2013 I've added a video on YouTube of the SMD soldering part:

Apart support and sharing place for builders, goal of the thread is to generate content to complete the tutorial.

Builders, please post your experience, problems, pics and whatever related with your FE build...
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Old 13th April 2013, 10:28 AM   #2
bcmbob is offline bcmbob  United States
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A carryover post from the RC thread to reply to the board cleaning question. I have not tried the commercial products but here is my home-brew method.

Board Cleaning
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Old 13th April 2013, 01:24 PM   #3
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Quote:
Originally Posted by bcmbob View Post
A carryover post from the RC thread to reply to the board cleaning question. I have not tried the commercial products but here is my home-brew method.
I'm going to have to try Bob's Scrubbing Bubbles. I have been trying "Flux Off (Rosin)" which is an spray can with a brush tip. It cuts flux pretty well and the brush lets you get into tight spots. It does leave some residue which I try to remove with a toothbrush and alcohol.

The biggest trick for me is to clean up often as the flux seems to get tougher with time. For the FE, I cleaned up after soldering all the SMD bits, and again after the through hole parts.
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Old 13th April 2013, 02:56 PM   #4
bcmbob is offline bcmbob  United States
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The Scrubbing Bubbles is indeed for the residue after the major cleaning is complete.

I forgot to mention fingernail polish remover also works well. It is basically diluted acetone which, if used full strength can dissolve the boards outer layers and lettering. The standard brands the ladies use is safe and cuts just a bit faster. Just be careful.
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Old 13th April 2013, 05:06 PM   #5
bcmbob is offline bcmbob  United States
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I just now discovered another use for those bubbles. Keep a thick layer on the floor so when those tiny caps, resistors, diodes and screw drop, they don't bounce sixteen feet from where you are working.
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Old 13th April 2013, 06:30 PM   #6
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Quote:
Originally Posted by lehmanhill View Post
I have been trying "Flux Off (Rosin)" which is an spray can with a brush tip.
I use a spray specific for PCB cleaning with the associated brush.

It works pretty well, I first spray the PCB, let pass some seconds and then brush it.

As a final touch I spray again to clean residues.

Compressed air is useful to remove quickly the sprayed liquid.

Quote:
Originally Posted by lehmanhill View Post
For the FE, I cleaned up after soldering all the SMD bits, and again after the through hole parts.
I do exactly the same.
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Old 13th April 2013, 11:18 PM   #7
Kreisky is offline Kreisky  Italy
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Very nice Dario the tutorial!
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Old 14th April 2013, 09:34 PM   #8
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Ok.. I am about to order thoser rikens and amch caps from parts connexion.

Regarding BG in C9... Parts Connecion has got 4V only 220uF

Can you confirm such low voltage is ok ?

From RC thread:
As Jac already noted there is still availability of the 220uF 4V BG PK.

They sound pretty good, better than BG STD and not far from BG FK/NX
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Old 14th April 2013, 09:50 PM   #9
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Found answer..they fine

Dario, I remember you were cautious about Nichicon KG, but I might get them cheaper so would give them a try (if you are not against that decision )
Plus according humble cap test Jantzen superior Z is nice one to try, especially considering price, what do you think about that one ?
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Last edited by voxxonline; 14th April 2013 at 09:54 PM. Reason: extra details
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Old 14th April 2013, 11:43 PM   #10
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Originally Posted by voxxonline View Post
Can you confirm such low voltage is ok ?
They're fine but in case of fault they will burn, so buy some spares.

It's better to mount them only after the amp is operational, for the first power on use any 220uF/50V you have at hand.

Quote:
Originally Posted by voxxonline View Post
Dario, I remember you were cautious about Nichicon KG, but I might get them cheaper so would give them a try (if you are not against that decision )
Everyone is encouraged to experiment.

Just one note:
If you want that your experiment can be useful for others compare with BOM parts, BOM is our common starting point.

Quote:
Originally Posted by voxxonline View Post
Plus according humble cap test Jantzen superior Z is nice one to try, especially considering price, what do you think about that one ?
I don't know, never tried them.

Just a note on Humble Home made cap test.

Those test are made on a HV application (crossover networks), on line level result may vary.

I would rather buy an Audyn Cap Plus, cheap and ,according Bob, very nice sounding.
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