Car audio LM3886 + SMPS on single sided board - Page 4 - diyAudio
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Old 17th November 2008, 04:17 PM   #31
rwaudio is offline rwaudio  Canada
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ide2003 try and make sure the ferrite toroid is suitable for a transformer. Yes I'm using the SG3525, it is simple to use and setup and works fairly well.
Almost all parts listed on the BOM are what I actually used to build the first version (other than the C12, C13 which I had many 1000uf caps on hand and the fuse holder which wasn't part of the pcb when I milled the first one since I used external fusing for testing)

Do you have a method of etching/milling your own pcb? it almost defeats the purpose to have these made at a board house because it was designed as single layer for diy use.
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Old 18th November 2008, 06:09 PM   #32
ide2003 is offline ide2003  Indonesia
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Quote:
Originally posted by rwaudio
ide2003 try and make sure the ferrite toroid is suitable for a transformer. Yes I'm using the SG3525, it is simple to use and setup and works fairly well.
Almost all parts listed on the BOM are what I actually used to build the first version (other than the C12, C13 which I had many 1000uf caps on hand and the fuse holder which wasn't part of the pcb when I milled the first one since I used external fusing for testing)

Do you have a method of etching/milling your own pcb? it almost defeats the purpose to have these made at a board house because it was designed as single layer for diy use.
thanks for your tips rwaudio, I haven't checked the toroid yet but the size is about correct, my friend have used them for radar baloon? (don't quite understand this)..as for the pcb should be no problem, I have built a mini cnc for small parts..back in 2005, still working well


TeguhPS
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Old 18th November 2008, 10:58 PM   #33
rwaudio is offline rwaudio  Canada
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ide2003 are you using mach3 on your mini cnc?
if so I can send you the g-code directly when it's finished since that's what I use on my cnc machine.

Attached is the first version of the schematic, I haven't double checked everything yet so please use it for reference or learning. Please don't build from that schematic yet until I am able to confirm it. Also snubbers will probably be added to both the power supply and amplifier outputs.
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File Type: jpg rw audio amp schematic.jpg (97.6 KB, 1068 views)
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Old 19th November 2008, 10:59 PM   #34
ide2003 is offline ide2003  Indonesia
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Quote:
Originally posted by rwaudio
ide2003 are you using mach3 on your mini cnc?
if so I can send you the g-code directly when it's finished since that's what I use on my cnc machine.

Attached is the first version of the schematic, I haven't double checked everything yet so please use it for reference or learning. Please don't build from that schematic yet until I am able to confirm it. Also snubbers will probably be added to both the power supply and amplifier outputs.
Thanks for the schematic rwaudio-really appreciated it-I know, I have to study a lot before building your PSU

I have also checked many threads in power supply here-it's not easy-needs a lot of good help, from you here and my EE friend.

I'm still using the turbocnc 4.2, my dynabook is too slow for mach3, but gcode is very welcome

TPS
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Old 24th November 2008, 06:47 PM   #35
Stream is offline Stream  Russian Federation
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Hello. Can You help me with selecting right ferrite core. I did not found the same core as you used...

The list of availible cores is here:
http://www.promelec.ru/catalog_info/54/132/523/292/
Here are dimensions : OD*Id*H

And here is parametres of cores:
http://www.promelec.ru/catalog_info/54/132/522/290/

Thanks.
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Old 25th November 2008, 07:03 PM   #36
rwaudio is offline rwaudio  Canada
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Hello Stream,

I had a look at both of those pages, but I'm not a ferrite expert. I don't know if those cores are close enough to the type 77 that most people recommend. Here is a page that lists a little more info on the core I chose I hope that helps.
http://www.bytemark.com/products/fermat77.htm
I'm using the F140-77

You might try contacting the company from the links you listed and ask them for a core suitable for SMPS or reference the type 77 core and ask if they have something comparable.
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Old 1st December 2008, 02:29 PM   #37
bero16v is offline bero16v  Croatia
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hi everyone...
But were is the primary filter coil for +12 rail? To prevent peaks fly over car instalations?

Outervise great project...

Sorry my english is bad...
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Old 26th July 2009, 10:12 PM   #38
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Default What is wire Size (awg) for work with T1

I am interested for your DIY. I am try to finding copper wire size compatible for T1. Please advise
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Old 27th July 2009, 01:56 AM   #39
Stream is offline Stream  Russian Federation
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Hello.
rwaudio, Did you finished your project? I'm very interested on final PSU schematic
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Old 16th November 2010, 06:03 PM   #40
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Hi RWaudio,

i dont know if i am reviving an old and dead thread that no one bothers to check on; but i would really love to have/fab this amp.

did you get around to finishing it? if so, would you be kind enough to share the results with us?

thanks,
madhu.
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