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Old 23rd November 2010, 12:18 AM   #1
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Default Just got lm3875 and it won't fit in breadboard

Is there something I can get for a breadboard that lets me connect it? The LM3875 chip's pins are spaced too wide to get into the breadboard, and I think the pins themselves are too big even if they were spaced correctly. What am I supposed to get to use this thing?

Thanks!
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Old 23rd November 2010, 12:53 AM   #2
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Only 5 out of 11 pins actually do anything on this chip. Perhaps you could cut off the NCs and bend the remaining pins to fit some enlarged holes in a breadboard?

The other two alternatives are to build 'in the air' or to get a standard PCB from a source like eBay.
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Old 23rd November 2010, 01:04 AM   #3
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After cutting off the NC pins, would it fit better diagonally?
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Old 23rd November 2010, 05:10 AM   #4
ratza is offline ratza  Romania
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It fits perfectly if it is mounted diagonally. Don't break the extra pins, leave them for stability.
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Old 23rd November 2010, 08:07 AM   #5
matherp is offline matherp  United Kingdom
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Here is a breadboard layout for a LM3875 as per the datasheet. R4 is mounted upright across adjacent tracks. It includes zobel components R5 and C5 which you can omit as required
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File Type: jpg lm3875.jpg (62.3 KB, 69 views)

Last edited by matherp; 23rd November 2010 at 08:12 AM.
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Old 23rd November 2010, 12:41 PM   #6
macboy is offline macboy  Canada
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Isn't that a "stripboard", not a "breadboard"? I always take breadboard to mean the solderless prototyping board like this:
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Old 23rd November 2010, 12:53 PM   #7
AndrewT is offline AndrewT  Scotland
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yes,
the big pins of a chipamp will damage the receptacles of the plugboard.
I would call it a breadboard as well.
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Old 23rd November 2010, 01:43 PM   #8
matherp is offline matherp  United Kingdom
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What pedants

Sorry, I always use the term wrong because I never bother with breadboard as with tinycad and veecad I can knock out a design for stripboard very quickly and if the circuit is right it always works with no worries over poor joints.

For reference the pins on a LM3875 will not fit in a BREADBOARD but will fit in a STRIPBOARD

best regards

Peter
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