BPA-300 :-D Pcb designed! - diyAudio
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Old 4th July 2004, 02:33 PM   #1
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Thumbs up BPA-300 :-D Pcb designed!

Ok guys, here it is. I spent many hours and tried to come up w/ a gainclone pcb w/ 6 lm3886 chips based on page 12 of the
bpa-200 pdf file, no dc servo's. Some of the components are meant to go underneith the pcb, since i wanted to keep traces short and size down. If anyone would like to critique the actual pcb, i can send them the expresspcb.com files

www.expresspcb.com is the place i got the software from, its a 2 layer board, and the ps includes 4 3900uF panasonic fc 35v caps... there is also space for bypass caps (of course those are optional). around the regulated section of the ps, there is space for 1kuF 25v fc caps and 100nF bypass caps.

I saw the thread down below about a bpa-200 kit. I think it'd be nice and easy to do a group buy on this, even if it was only 100 boards. I'd have to sorta reverse the board if people want to do a stereo board (ie, all the inputs and output are on the wrong side of the board for stereo, i'd need a mirror image, but something that wouldn't change the pinout. I spent about 20 hours on this...and this is my first attempt at a layout. If someone wants to critique it, and help me get this whole thing together, maybe in the future someone could arrange a group buy. Later!

-Matthew K. Olson


ps, email me through diyaudio, if i don't respond w/in 24 hours, i didn't get the email
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Old 5th July 2004, 06:49 PM   #2
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No comments? I was hoping someone would have a look at this for me and give me a 2nd set of eyes looking on the pcb. Anyone?

-Matthew K. Olson

mattyo5 at aol.com
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Old 5th July 2004, 08:04 PM   #3
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I could have help you but my monitor is broken (made 1991, Sony 19") so I can't see red.... and sometimes green..... etc. Now it's red.

One thing I can say, three LM3886 can deliver 33 A, make sure you don't fuse the traces! 70 um (2 oz.) and/or fat copper traces.
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Old 5th July 2004, 08:50 PM   #4
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Peranders, i can send you the files for expresspcb, then you can see things a little better. Email me if you like and I'll send the files. I used pretty fat traces for the outputs. I need someone to really critique it and make sure my circuit looks good. Thanks!

-Matthew K. Olson
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Old 6th July 2004, 03:01 AM   #5
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Send me the files and I'll have a look...

It looks OK but we can make it better



switchmaster@hotmail.com







-Matt
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Old 6th July 2004, 03:04 AM   #6
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One more thing, if you want it small why not use surface-mount? There are up to 3.5W SMT resistors out there, with 2W being cheap and easy to find. 1/2W is even smaller and easier to come by inexpensivly.

Caps and diodes can also be SMT, to make a tiny PCB and reduce noise to an absolute minimum.






-Matt
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Old 6th July 2004, 03:09 AM   #7
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I don't want to use SMT because of easyness for beginners. Its a good point, but still. Also, some of the components are underneith, which hasn't been noted, but could be guessed. Especially under the space i have for the regulators heatsink. You're email is on its way. thanks

-Matthew K. Olson
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Old 6th July 2004, 05:16 AM   #8
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Looks good..

What kind of price do you think it would be, just for the board.

thanks
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Old 6th July 2004, 05:24 AM   #9
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If this board winds up working well, and you decide to do a group buy on 'em, you can count me in for at least a few, maybe more, depending on the price
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Old 6th July 2004, 07:02 AM   #10
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Can count me in also.... personally I would like the board w/o PSU diodes. Maybe just the board with amplifier circuit and rail capacitors ?

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