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My_Ref Fremen Edition RC - Build thread
My_Ref Fremen Edition RC - Build thread
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Old 28th July 2012, 01:32 PM   #1
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My_Ref Fremen Edition RC - Build thread
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, 1903 views)
File Type: pdf My_Ref_FE RC - Silkscreen.pdf (53.9 KB, 634 views)
File Type: pdf My_Ref_FE RC - BOM.pdf (11.2 KB, 765 views)
File Type: pdf My_Ref_FE RC - BOM (On a budget).pdf (8.7 KB, 480 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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My_Ref Fremen Edition RC - Build thread
Default 1 - SMD parts

Clean boards with alcohol.

The first component we put in place is the LM318.

Apply flux to pads:

My_Ref Fremen Edition RC - Build thread-1-flux-lm318-pads-jpg

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

My_Ref Fremen Edition RC - Build thread-2-lm318-jpg

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)

My_Ref Fremen Edition RC - Build thread-3-solder-pin-lm318-jpg

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

My_Ref Fremen Edition RC - Build thread-4-solder-lm318-jpg

This should be the result:

My_Ref Fremen Edition RC - Build thread-5-lm318-soldered-jpg
Attached Images
File Type: jpg 1 flux on lm318 pads.jpg (185.2 KB, 4190 views)
File Type: jpg 2 lm318 in place.jpg (149.6 KB, 4181 views)
File Type: jpg 3 solder one pin of lm318.jpg (192.4 KB, 4189 views)
File Type: jpg 4 solder LM318.jpg (156.5 KB, 4172 views)
File Type: jpg 5 lm318 soldered.jpg (142.3 KB, 4174 views)
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Old 28th July 2012, 01:59 PM   #3
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My_Ref Fremen Edition RC - Build thread
We then proceed with 0805 compensation resistors and cap, starting from C34.

Apply flux:

My_Ref Fremen Edition RC - Build thread-6-flux-c34-jpg

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

My_Ref Fremen Edition RC - Build thread-7-c34-jpg

then apply solder and tip to the other end

My_Ref Fremen Edition RC - Build thread-8-c34-jpg

Result

My_Ref Fremen Edition RC - Build thread-9-c34-soldered-jpg
Attached Images
File Type: jpg 6 flux on c34.jpg (139.8 KB, 4076 views)
File Type: jpg 7 c34 one end.jpg (167.6 KB, 4047 views)
File Type: jpg 8 c34 other side.jpg (135.1 KB, 4019 views)
File Type: jpg 9 c34 soldered.jpg (146.1 KB, 4017 views)
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Old 28th July 2012, 02:04 PM   #4
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My_Ref Fremen Edition RC - Build thread
after applying flux to R39 we solder it like we did with C34

My_Ref Fremen Edition RC - Build thread-10-r39-soldered-jpg

Same tecnicque for C43

My_Ref Fremen Edition RC - Build thread-11-r43-soldered-jpg

Note that marking on resistors follow the same direction of the arrow
Attached Images
File Type: jpg 10 R39 soldered.jpg (157.9 KB, 3967 views)
File Type: jpg 11 R43 soldered.jpg (168.6 KB, 3949 views)
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Old 28th July 2012, 02:12 PM   #5
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My_Ref Fremen Edition RC - Build thread
The next component will be the MELF diode D3.

As usual apply flux, keep it in place using tweezers

My_Ref Fremen Edition RC - Build thread-12-d3-jpg

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

My_Ref Fremen Edition RC - Build thread-d3-soldered-jpg

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)

My_Ref Fremen Edition RC - Build thread-14-d1-d2-soldered-jpg
Attached Images
File Type: jpg 12 keep d3 in place.jpg (156.4 KB, 3891 views)
File Type: jpg d3 soldered.jpg (39.2 KB, 3820 views)
File Type: jpg 14 d1 d2 soldered.jpg (199.4 KB, 3836 views)
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Old 28th July 2012, 02:16 PM   #6
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My_Ref Fremen Edition RC - Build thread
Now the we know how to solder SMD parts and made some experience, we proceed with all other resistors (pay attention to orientation)

My_Ref Fremen Edition RC - Build thread-15-smds-soldered-jpg

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, 3844 views)
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Old 29th July 2012, 01:45 AM   #7
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My_Ref Fremen Edition RC - Build thread
Default 2 - Trough hole parts

I suggest to mount standoffs before starting this phase.

Screws will stabilize board when it's reversed for soldering

My_Ref Fremen Edition RC - Build thread-16-standoffs-jpg

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.

My_Ref Fremen Edition RC - Build thread-17-pliers-jpg

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

My_Ref Fremen Edition RC - Build thread-18-board-jpg

Then solder first one side of both resitors

My_Ref Fremen Edition RC - Build thread-19-solder-jpg

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

Proceed with other 1/4W resistors

My_Ref Fremen Edition RC - Build thread-20-leave-thermals-unsoldered-jpg

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

My_Ref Fremen Edition RC - Build thread-21-orientation-jpg
Attached Images
File Type: jpg 16 standoffs.jpg (163.6 KB, 3735 views)
File Type: jpg 17 pliers.jpg (157.3 KB, 3716 views)
File Type: jpg 18 turned board.jpg (139.9 KB, 3699 views)
File Type: jpg 19 solder one side.jpg (475.4 KB, 3723 views)
File Type: jpg 20 leave thermals unsoldered.jpg (148.3 KB, 3638 views)
File Type: jpg 21 keep same orientation.jpg (190.1 KB, 3628 views)
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Old 29th July 2012, 02:03 AM   #8
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My_Ref Fremen Edition RC - Build thread
Next lower profile components are the 14V zeners, bend leads first

My_Ref Fremen Edition RC - Build thread-22-bend-zener-leads-jpg

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)

My_Ref Fremen Edition RC - Build thread-23-14v-zeners-jpg

Then solder the 1N4001

My_Ref Fremen Edition RC - Build thread-24-1n4001-jpg

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.

My_Ref Fremen Edition RC - Build thread-25-half-watt-orientation-jpg

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

I suggest the new one

My_Ref Fremen Edition RC - Build thread-26-c9r10-arrangement-jpg

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

My_Ref Fremen Edition RC - Build thread-26-koa-spr-orientation-jpg

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

My_Ref Fremen Edition RC - Build thread-27-koa-thermal-jpg

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

This is the lower profile parts soldering result

My_Ref Fremen Edition RC - Build thread-28-lower-profile-result-jpg
Attached Images
File Type: jpg 22 bend zener leads.jpg (136.8 KB, 3562 views)
File Type: jpg 23 14V zeners.jpg (218.1 KB, 3566 views)
File Type: jpg 24 1n4001.jpg (178.9 KB, 3547 views)
File Type: jpg 25 half watt orientation.jpg (199.0 KB, 3522 views)
File Type: jpg 26 C9R10 arrangement.jpg (99.1 KB, 3794 views)
File Type: jpg 26 KOA SPR orientation.jpg (153.7 KB, 3648 views)
File Type: jpg 27 KOA thermal.jpg (119.2 KB, 3474 views)
File Type: jpg 28 lower profile result.jpg (281.6 KB, 3489 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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My_Ref Fremen Edition RC - Build thread
Next part to solder is the led.

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

My_Ref Fremen Edition RC - Build thread-29-led-silkscreen-jpg

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.

My_Ref Fremen Edition RC - Build thread-30-led-orientation-jpg

To solder it keep it in place using fingers

My_Ref Fremen Edition RC - Build thread-31-keeping-led-jpg
Attached Images
File Type: jpg 29 led silkscreen.jpg (82.6 KB, 3401 views)
File Type: jpg 30 led orientation.jpg (224.2 KB, 3441 views)
File Type: jpg 31 keeping led in place.jpg (163.0 KB, 3426 views)
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Old 29th July 2012, 08:21 PM   #10
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My_Ref Fremen Edition RC - Build thread
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

My_Ref Fremen Edition RC - Build thread-32-soldering-lead-tranny-jpg

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

As usual leave thermal pads unsoldered.

My_Ref Fremen Edition RC - Build thread-33-solder-leads-jpg


My_Ref Fremen Edition RC - Build thread-34-reg-trannies-jpg

My_Ref Fremen Edition RC - Build thread-35-transistors-soldered-jpg
Attached Images
File Type: jpg 33 solder other leads.jpg (159.3 KB, 3353 views)
File Type: jpg 32 Soldering first lead of tranny.jpg (141.7 KB, 3354 views)
File Type: jpg 34 reg trannies.jpg (167.1 KB, 3321 views)
File Type: jpg 35 transistors soldered.jpg (246.9 KB, 3343 views)
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