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Old 30th April 2007, 04:51 AM   #1
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Default Birth of another gainclone around OPA549

I started electronic hobby project ages ago when I was studying in junior high, but one thing that always bothered me was making a good quality PCB for the projects. I tried all methods handmade PCBs, photoresist boards, toner transfer method but the conlusion was nothing beats a PCB made through proper fabrication process.
Couple of months ago I found a small fabrication unit going bankrupt due poor management and I immediatley decided to buy it, and my relationships and management made it a success right away, as I dedicated it to DIYers, no setup charges no extra fee, require just gerber file and a nominal charge per square inch.
Now that became launch pad for my hobby project in good quality.
My first project was development of Gainlcone based around OPA549 (my favourite chip), now this could be a heated debate why OPA and why not LM3886, my reason is that LMs that I get are many a times fake, its only OPA that I could find (here) which are genuine.
I dont do monoblocks.
This is a stereo version.
and I look forward to feedback from the board so that improvements if any could be made.
Right now I got about 30 PCBs done for myself, I needed about 6 of them for my own projects.
here is the top silk side of the PCB
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Old 30th April 2007, 04:54 AM   #2
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another view
bottom focused on one OPA549
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Old 30th April 2007, 05:01 AM   #3
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being populated with 2200 uf rubycon caps on each rail of each channel
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Old 30th April 2007, 05:13 AM   #4
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Fully populated, now comes the tricky part of soldering.
well on to soldering station.
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Old 30th April 2007, 05:29 AM   #5
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populated and soldered finally.
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Old 30th April 2007, 05:38 AM   #6
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two done four to go....
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Old 30th April 2007, 05:50 AM   #7
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Last one, now what is left is put it in a good case, toriod along supply is ready what I am waiting is for the ICD2 coz I want to put in a pre amp build around PGA and PIC.
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Old 30th April 2007, 09:06 AM   #8
Bone is offline Bone  United Kingdom
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Abid what circuit are you using and are you going to make these PCBs available to us?

Tony
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Old 30th April 2007, 10:07 AM   #9
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here are the schematics though they are aweful, coz i modified LM3886 library to make OPA549, but I guess it works and solves my problem. Didnt get the time to make new library. PCB is about 5x2.2 inches.
Well I have got about 24 free PCBs, you are welcome to PM.
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Old 30th April 2007, 04:21 PM   #10
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Are you going to be taking orders for PCB's? If so, what do you think the approx. cost per sq. in. would be? I would like to have a few custom boards made.
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