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Chip Amps Amplifiers based on integrated circuits

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Old 19th March 2007, 07:47 PM   #11
impsick is offline impsick  United States
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do a search for lm3886 eagle files. a bunch of people have shared this project and the lm3875.
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Old 19th March 2007, 07:50 PM   #12
Fenris is offline Fenris  United States
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I've got two designs that I can send you, if you really need it. Single sided, both work. I normally use Brian GTs boards or point to point, but I've designed two for special situations. The first is dual 3886, non-inverting with an input buffer and designed for sound re-enforcement. It has on-board bridge rectifiers, snubberized PSU, and is about 20% SMD. It's not a super-hi-fi approach, but it works just fine and is very compact. The other is an inverting design that can be used modularly for the BPA300 using mostly SMD parts. It's designed primarily for bass duty (it's going in a 200W bass guitar amp), but a few component changes will let it be a little more "hi-fi".

All my work I do in FreePCB. There's a learning curve, but once you figure it out, it's really quick.
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Old 19th March 2007, 08:52 PM   #13
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Quote:
Originally posted by Minion

Also there are not a Lot of design considerations when designing a simple Chipamp PCB becides makeing the Power rail traces thick enough and makeing sure the Feedback resistors are close to the IC and there are Bypass caps close to the Power pins of the IC (Optional)......


Easy....

ok thank for the infos!!! nice forum!!! thanks a lot guys i think i try it on myself...



no more design considerations??!!
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Old 20th March 2007, 10:51 AM   #14
Dave S is offline Dave S  United Kingdom
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I went for a pair of these boards because it looks like an engineer did the layout (not an audiophile) and they suit my requirements:

http://www.generalguitargadgets.com/...185&Itemid=210

You could either buy these boards or use the layout as a basis for your own


A few design considerations:
Get the grounding right
Build a pair of "reference" chipamps using correct engineering practices and good quality commercial parts, then build another pair for the audiophile tweakery.
Perform a few simple measurements to make sure they are not prone to oscillation and that they are working properly.
Using sensible wiring practices - loop area minimisation etc
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Old 21st March 2007, 02:45 PM   #15
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sooo... i have made the scematic!

thats the psu
but i have a problem!

when i make the board from the scematic eagle connects the pad v- with -pgnd and e3 etc...


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