My_Ref Fremen Edition RC - Build thread - diyAudio
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Old 28th July 2012, 01:32 PM   #1
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Default My_Ref Fremen Edition RC - Build thread

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.
Attached Files
File Type: pdf My_Ref_FE RC - Schematic.pdf (44.9 KB, 1547 views)
File Type: pdf My_Ref_FE RC - Silkscreen.pdf (53.9 KB, 484 views)
File Type: pdf My_Ref_FE RC - BOM.pdf (11.2 KB, 625 views)
File Type: pdf My_Ref_FE RC - BOM (On a budget).pdf (8.7 KB, 379 views)
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Last edited by ClaveFremen; 1st August 2012 at 11:08 PM.
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Old 28th July 2012, 01:50 PM   #2
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Default 1 - SMD parts

Clean boards with alcohol.

The first component we put in place is the LM318.

Apply flux to pads:

Click the image to open in full size.

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

Click the image to open in full size.

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)

Click the image to open in full size.

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

Click the image to open in full size.

This should be the result:

Click the image to open in full size.
Attached Images
File Type: jpg 1 flux on lm318 pads.jpg (185.2 KB, 3234 views)
File Type: jpg 2 lm318 in place.jpg (149.6 KB, 3224 views)
File Type: jpg 3 solder one pin of lm318.jpg (192.4 KB, 3238 views)
File Type: jpg 4 solder LM318.jpg (156.5 KB, 3217 views)
File Type: jpg 5 lm318 soldered.jpg (142.3 KB, 3226 views)
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Old 28th July 2012, 01:59 PM   #3
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We then proceed with 0805 compensation resistors and cap, starting from C34.

Apply flux:

Click the image to open in full size.

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

Click the image to open in full size.

then apply solder and tip to the other end

Click the image to open in full size.

Result

Click the image to open in full size.
Attached Images
File Type: jpg 6 flux on c34.jpg (139.8 KB, 3153 views)
File Type: jpg 7 c34 one end.jpg (167.6 KB, 3128 views)
File Type: jpg 8 c34 other side.jpg (135.1 KB, 3104 views)
File Type: jpg 9 c34 soldered.jpg (146.1 KB, 3104 views)
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Old 28th July 2012, 02:04 PM   #4
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after applying flux to R39 we solder it like we did with C34

Click the image to open in full size.

Same tecnicque for C43

Click the image to open in full size.

Note that marking on resistors follow the same direction of the arrow
Attached Images
File Type: jpg 10 R39 soldered.jpg (157.9 KB, 3066 views)
File Type: jpg 11 R43 soldered.jpg (168.6 KB, 3049 views)
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Old 28th July 2012, 02:12 PM   #5
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The next component will be the MELF diode D3.

As usual apply flux, keep it in place using tweezers

Click the image to open in full size.

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

Click the image to open in full size.

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)

Click the image to open in full size.
Attached Images
File Type: jpg 12 keep d3 in place.jpg (156.4 KB, 3005 views)
File Type: jpg d3 soldered.jpg (39.2 KB, 2935 views)
File Type: jpg 14 d1 d2 soldered.jpg (199.4 KB, 2946 views)
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Old 28th July 2012, 02:16 PM   #6
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Now the we know how to solder SMD parts and made some experience, we proceed with all other resistors (pay attention to orientation)

Click the image to open in full size.

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.
Attached Images
File Type: jpg 15 all smds soldered.jpg (256.7 KB, 2959 views)
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Old 29th July 2012, 01:45 AM   #7
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Default 2 - Trough hole parts

I suggest to mount standoffs before starting this phase.

Screws will stabilize board when it's reversed for soldering

Click the image to open in full size.

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.

Click the image to open in full size.

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

Click the image to open in full size.

Then solder first one side of both resitors

Click the image to open in full size.

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

Proceed with other 1/4W resistors

Click the image to open in full size.

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

Click the image to open in full size.
Attached Images
File Type: jpg 16 standoffs.jpg (163.6 KB, 2862 views)
File Type: jpg 17 pliers.jpg (157.3 KB, 2853 views)
File Type: jpg 18 turned board.jpg (139.9 KB, 2830 views)
File Type: jpg 19 solder one side.jpg (475.4 KB, 2850 views)
File Type: jpg 20 leave thermals unsoldered.jpg (148.3 KB, 2773 views)
File Type: jpg 21 keep same orientation.jpg (190.1 KB, 2765 views)
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Old 29th July 2012, 02:03 AM   #8
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Next lower profile components are the 14V zeners, bend leads first

Click the image to open in full size.

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)

Click the image to open in full size.

Then solder the 1N4001

Click the image to open in full size.

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.

Click the image to open in full size.

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

I suggest the new one

Click the image to open in full size.

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

Click the image to open in full size.

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

Click the image to open in full size.

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

This is the lower profile parts soldering result

Click the image to open in full size.
Attached Images
File Type: jpg 22 bend zener leads.jpg (136.8 KB, 2713 views)
File Type: jpg 23 14V zeners.jpg (218.1 KB, 2710 views)
File Type: jpg 24 1n4001.jpg (178.9 KB, 2701 views)
File Type: jpg 25 half watt orientation.jpg (199.0 KB, 2680 views)
File Type: jpg 26 C9R10 arrangement.jpg (99.1 KB, 2935 views)
File Type: jpg 26 KOA SPR orientation.jpg (153.7 KB, 2793 views)
File Type: jpg 27 KOA thermal.jpg (119.2 KB, 2636 views)
File Type: jpg 28 lower profile result.jpg (281.6 KB, 2657 views)
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Last edited by ClaveFremen; 29th July 2012 at 02:09 AM.
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Old 29th July 2012, 02:17 AM   #9
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Next part to solder is the led.

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

Click the image to open in full size.

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.

Click the image to open in full size.

To solder it keep it in place using fingers

Click the image to open in full size.
Attached Images
File Type: jpg 29 led silkscreen.jpg (82.6 KB, 2578 views)
File Type: jpg 30 led orientation.jpg (224.2 KB, 2605 views)
File Type: jpg 31 keeping led in place.jpg (163.0 KB, 2602 views)
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Old 29th July 2012, 08:21 PM   #10
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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.

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

Click the image to open in full size.

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

As usual leave thermal pads unsoldered.

Click the image to open in full size.


Click the image to open in full size.

Click the image to open in full size.
Attached Images
File Type: jpg 33 solder other leads.jpg (159.3 KB, 2534 views)
File Type: jpg 32 Soldering first lead of tranny.jpg (141.7 KB, 2527 views)
File Type: jpg 34 reg trannies.jpg (167.1 KB, 2501 views)
File Type: jpg 35 transistors soldered.jpg (246.9 KB, 2518 views)
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