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-   -   My_Ref Fremen Edition RC - Build thread (http://www.diyaudio.com/forums/chip-amps/216915-my_ref-fremen-edition-rc-build-thread.html)

ClaveFremen 28th July 2012 02:32 PM

My_Ref Fremen Edition RC - Build thread
 
4 Attachment(s)
Hi all,

in this thread we will discuss about building the My_Ref Fremen Edition using the Release Candidate boards.

We also discuss listening evaluations and, eventually, further improvements.

I've attached schematic, silkscreen and BOMs

To build it you will need:
  • soldering iron
  • thin solder
  • tacky flux
  • tweezers
  • a good sight or a magnifier ;)
In the next posts I'll illustrate my build as a tutorial.

ClaveFremen 28th July 2012 02:50 PM

1 - SMD parts
 
5 Attachment(s)
Clean boards with alcohol.

The first component we put in place is the LM318.

Apply flux to pads:

http://www.diyaudio.com/forums/attac...1&d=1343482850

Then position the LM318 (take care to pins to pad alignment) and keep it in place with tweezers:

http://www.diyaudio.com/forums/attac...1&d=1343483001

Apply the wet solder tip to one of the pins (the bottom one on the right is NC so it's a good one to use)

http://www.diyaudio.com/forums/attac...1&d=1343483175

Now that the LM318 is kept in place by the soldered pin we solder all the others.

Just apply the solder and solder tip for 1-2 seconds

http://www.diyaudio.com/forums/attac...1&d=1343483310

This should be the result:

http://www.diyaudio.com/forums/attac...1&d=1343483448

ClaveFremen 28th July 2012 02:59 PM

4 Attachment(s)
We then proceed with 0805 compensation resistors and cap, starting from C34.

Apply flux:

http://www.diyaudio.com/forums/attac...1&d=1343483620

position the component and while keeping it in place with tweezers apply the wet tip to one side.

http://www.diyaudio.com/forums/attac...1&d=1343483730

then apply solder and tip to the other end

http://www.diyaudio.com/forums/attac...1&d=1343483878

Result

http://www.diyaudio.com/forums/attac...1&d=1343483965

ClaveFremen 28th July 2012 03:04 PM

2 Attachment(s)
after applying flux to R39 we solder it like we did with C34

http://www.diyaudio.com/forums/attac...1&d=1343484110

Same tecnicque for C43

http://www.diyaudio.com/forums/attac...1&d=1343484218

Note that marking on resistors follow the same direction of the arrow

ClaveFremen 28th July 2012 03:12 PM

3 Attachment(s)
The next component will be the MELF diode D3.

As usual apply flux, keep it in place using tweezers

http://www.diyaudio.com/forums/attac...1&d=1343484437

and apply the wet tip to one end (for melf you'll need a well wet tip).

Apply solder and tip to the other end.

This should be the result

http://www.diyaudio.com/forums/attac...1&d=1343484630

Now, like we did for LM318 we proceed with D1 and D2 (flux, solder one pin while keeping the part in place with tweezers, solder the other pins)

http://www.diyaudio.com/forums/attac...1&d=1343484772

ClaveFremen 28th July 2012 03:16 PM

1 Attachment(s)
Now the we know how to solder SMD parts and made some experience, we proceed with all other resistors (pay attention to orientation)

http://www.diyaudio.com/forums/attac...1&d=1343484946

Note that 3K3 resistors are 0805 ones soldered on 1206 pads.

Mouser don't stock in this moment 1206 3K3 Susumus so in BOM 0805 ones are indicated.

ClaveFremen 29th July 2012 02:45 AM

2 - Trough hole parts
 
6 Attachment(s)
I suggest to mount standoffs before starting this phase.

Screws will stabilize board when it's reversed for soldering

http://www.diyaudio.com/forums/attac...1&d=1343524679

The golder rule is starting from lower profile parts so we'll start from DC protection resistors.

Using pliers to bend leads helps to obtain a nice looking build.

Solder parts on both boards, alternating them, it would be easier and let parts cool.

http://www.diyaudio.com/forums/attac...1&d=1343524918

After bending leads mount the resistors in posistion and turn the board

http://www.diyaudio.com/forums/attac...1&d=1343525136

Then solder first one side of both resitors

http://www.diyaudio.com/forums/attac...1&d=1343525723

Then proceed with other side after the second board is done.

Proceed with other 1/4W resistors

http://www.diyaudio.com/forums/attac...1&d=1343525925

Note that I've left unsoldered thermals pads, we'll do the same for all thermals so we can solder them later with a higher soldering temperature.

If possible keep same orientation, it will look better

http://www.diyaudio.com/forums/attac...1&d=1343526164

ClaveFremen 29th July 2012 03:03 AM

8 Attachment(s)
Next lower profile components are the 14V zeners, bend leads first

http://www.diyaudio.com/forums/attac...1&d=1343526395

Use same tecnique used for resitors (mount parts, turn the board, solder one lead for each part, do the same on the other board, solder the remaining lead)

http://www.diyaudio.com/forums/attac...1&d=1343526585

Then solder the 1N4001

http://www.diyaudio.com/forums/attac...1&d=1343526713

We can start with 1/2W resistors, from R10

Note in the next picture the correct orientation the gold (tolerance) band represent the point of the arrow.

http://www.diyaudio.com/forums/attac...1&d=1343526944

In this phase you should choose which C9/R10 arrangement to use.

I suggest the new one

http://www.diyaudio.com/forums/attac...1&d=1343527172

Note that Rikens have opposite orientation (tolerance red band goes opposite to the arrow)

http://www.diyaudio.com/forums/attac...1&d=1343527342

KOA SPR orientation, note that the marking on board have same orientation of the one on resistor.

http://www.diyaudio.com/forums/attac...1&d=1343527557

Note the thermal pad left unsolderd also for the KOA...

This is the lower profile parts soldering result

http://www.diyaudio.com/forums/attac...1&d=1343527753

ClaveFremen 29th July 2012 03:17 AM

3 Attachment(s)
Next part to solder is the led.

Silkscreen it's not clear on led orientation, the silkscren file help us

http://www.diyaudio.com/forums/attac...1&d=1343527915

Sadly the led in BOM doesn't have the dent so we should use leads leght to identify anode and cathode, the right orientation should be this one.

http://www.diyaudio.com/forums/attac...1&d=1343528089

To solder it keep it in place using fingers

http://www.diyaudio.com/forums/attac...1&d=1343528233

ClaveFremen 29th July 2012 09:21 PM

4 Attachment(s)
A further note on LED, traces of LED's pads and external LED connectors are parallel so for those that want to use the connector use same orientation.

Let's pass to transitors.

:att'n: there are 2 types of BC639 in BOM: BC639-16 (regulator) and BC639G
(DC-protection)

I choose to start from DC protection ones

When soldering transistors solder one single lead for each

http://www.diyaudio.com/forums/attac...1&d=1343592859

Then solder other leads alternating transistors so to not heat too much parts.

As usual leave thermal pads unsoldered.

http://www.diyaudio.com/forums/attac...1&d=1343592859


http://www.diyaudio.com/forums/attac...1&d=1343593101

http://www.diyaudio.com/forums/attac...1&d=1343593240


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