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Old 27th October 2008, 10:23 AM   #1
danbli is offline danbli  Sweden
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Default LM3875 on Veroboard

Hello!

Is there anoone out there that has built a chipamp with the LM3875 on Veroboard and got some god results?

I would appreciate some pictures och drawings of how you solved it on veroboard.

/Daniel
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Old 27th October 2008, 12:15 PM   #2
jaycee is offline jaycee  United Kingdom
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I would not recommend it. The pin pitch of the LM3875 doesn't really match veroboard. Also, the tracks are not really thick enough to carry current for an amplifier.

If you can't etch PCB's you can cut tracks into a piece of board using a good knife and some planning on graph paper.
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Old 27th October 2008, 12:52 PM   #3
danbli is offline danbli  Sweden
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I saw this GC bulit on prototype board.... Seems lik a a good alternative for me.

Chinese GC

/Daniel
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Old 27th October 2008, 03:14 PM   #4
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yes you can

this is a lm3886 but 3875 should be easier even

http://img.photobucket.com/albums/v2...r/IMG_1788.jpg


http://img.photobucket.com/albums/v2...r/IMG_1789.jpg

You cut off all the NC pins and bend the pins until they go into the holes.

just work carefully with a small pair of long nose pliers. Breaking off the NC pins makes things a lot simpler.

good luck
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Old 27th October 2008, 03:57 PM   #5
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Sure it can be done, I even build a bridged-connected LM4780 om veroboard. I usually solder pieces of solid copper wire to the veroboard to make nice heavey duty tracks.

goodluck,
Thijs
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Old 27th October 2008, 11:23 PM   #6
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Mark has built a few on a veroboard:

http://diyaudioprojects.com/Chip/P2PLM3875/

http://diyaudioprojects.com/Chip/Nanoo/
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Old 28th October 2008, 06:23 AM   #7
ratza is offline ratza  Romania
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Mine is also on veroboard, although is with 3886. The pins fit perfectly in the holes but you need to place the chip in diagonal, aka 45deg. This is only valid for 0.1 inch spacing.
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Old 28th October 2008, 06:52 PM   #8
danbli is offline danbli  Sweden
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Am I right that I could cut of all the pins except 1,3,4,7,8 on the LM3875?

/Daniel
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Old 28th October 2008, 09:18 PM   #9
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Exactly.
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Old 31st October 2008, 07:19 AM   #10
sangram is offline sangram  India
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Just to add:

I've built amps with the 3886 and 4766, both with much higher pin density than the 3875, without any board at all, just purely P2P. Also, I use SMD X7R caps directly on the 3886 pins for bypass (extremely difficult to do well as a slight pull from a power wire breaks these ceramics in two), so what you're looking at is surely possible as the 3875 is a lot simpler.

I'm so used to it now I can practically replicate a layout each time, but I choose to look at reducing the size of the build every time. The last one I did used 1/2 watt Holcos instead of the 1/8 watt films I normally use, so it was a little more challenging, but it runed out decently in the end.
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