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Old 3rd April 2004, 12:32 AM   #11
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Default that NFB resistor!

I would agree that this was probably the most time consuming part of the kit assembly, but I think it's one of those "No pain, no gain" (excuse the unintentional pun) situations. Here how I did mine.

Bend the legs of the (Caddock) resistor. The leg of pin 3 can be accomplished with one bend towards you. - Just not too sharp. Form the bends of the other leg, this will probably require two bends. Trim the leads of the resistor. Tin the legs of the chip, and the ends of the resistor legs. Now place the chip lying on it's back, and put the resistor on top, line up the leg for pin 3 and hold in place with your finger. Don't worry if the leg for the other pin is slightly off. Whilst still holding it in place, just run you soldering iron along the edge of the chip leg, enough to melt the solder tin from before. Once that has cooled, you can easily bend the other leg to the correct position with a pair of tweezers, and repeat the soldering process.

The first chip took the longest, but by the fourth one, it was pretty easy...

I was also very impressed with the ease and efficiency of the group order. - and Meredith must have spent ages packaging everything so thoroughly...!

Steve
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Old 3rd April 2004, 12:57 AM   #12
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Well I have not began building mine yet however I was very pleased with the quality of the units. The fact that "starter" resistors were included after everyone had already signed up and paid (to me it was a bonus, not a marketing ploy ). Oh even the wrapped in paper thing was nice


This was my first group buy. I have seen tons of group buys on other boards, and there is always some glitch. Thanks Brian, you made it a very carefree and fun experience.
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Old 3rd April 2004, 01:05 AM   #13
BrianGT is offline BrianGT  United States
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Default Re: that NFB resistor!

Quote:
Originally posted by BlackDog
<information on the nfb resistor>

The first chip took the longest, but by the fourth one, it was pretty easy...

I was also very impressed with the ease and efficiency of the group order. - and Meredith must have spent ages packaging everything so thoroughly...!
Good advice for doing the NFB resistor. I agree that the first one takes the longest. I have done about 8 of them now, and have gotten pretty quick at doing them. Don't forget that you can always solder the resistor to the bottom the board, which Meredith did for her boards:
http://www.briangt.com/gallery/nigc-kit/build034?full=1
She managed to the entire board herself, with this being the first soldering project she has ever done. I am teaching her how to make an aluminum chassis this weekend.

I actually spent all the time packing the kits into the padded mailers, then Meredith packed the the padded mailers into the Priority mailers, took care of all the addressing and trips to the post office.

--
Brian
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Old 3rd April 2004, 01:16 AM   #14
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Quote:
Originally posted by ultrachrome


I just like the clamp method. It may or may not make a difference with a gainclone but its elegance pleases me, nonetheless. Building audio gear for me is as much (or more) about expression as it is about sound. Additionally, I have some heatsinks that would be easier to use with the clamp method.

It seems to me that chip actually sounds better when no clamp is used, just one screw (more air). I will not be using clamps anymore (and only insulated chips).

As to the feedback resistor, it attaches very easily to the bottom side. Just bend the leads and insert them between amp's pins (it will stay there), solder and cut off excees leads. Couldn't be any easier.
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Old 3rd April 2004, 02:10 AM   #15
SQ Kid is offline SQ Kid  United States
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i am 100% pleased by this group buy. the help i've recieved (along with the newlyweds' generousity) has been top notch and look forward to being part of the gainclone followers for a long time. everything was recieved quickly and well done, emails were quickly replied to, and i've enjoyed building these amps more so than any diy project to date (my 7 roommates can attest to this due to the fact that i've got piles of electronics and equipment scattered among the dorm suite). i've even gathered a couple more diyer thanks to this project (my room is lovingly refered to as the lab due to my roommate and i's ever growing electronics collection). once again, i cant thank you all enough (especially for the credit card bill..... )
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