| digi01 |
the PCB lay out is a pretty crazy DIY things for me:D
this is my BPA200 projects,the chips +/- rail and ground track has not finished yet,any suggestions??
the sch is based on the original BPA200 article,use DC serv.and the amp pcb is not including the push stage. |
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| carlosfm |
| No need to use servos.;) |
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| digi01 |
mmm...:cool: ;)
because those 3886 chips need to leave certain distance.it happens that there is space of serv parts on the boards,I put it.
I think it's wise to provide the board space for serv circuit.If you do not like the BPA200 work at serv mode,just leave the serv chip socket empty. |
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| digi01 |
optmize version,including input buffer.
the pdf file show top and silk layer;) |
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| digi01 |
My matrix power supply boards,for BPA200.
a couple of typical unregulated bipolar power supply,and big caps of supply reservoir capacitance for each supply voltage rail.
the PCB board can mounting 300/400mil pins,44mm(max) diameter caps.
enjoys;) |
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| digi01 |
| another small design. |
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| digi01 |
ver#1.0 source share.
try upload my BPA200 gerber files.can anybody give me a rank:D
enjoys |
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| Mad_K |
| quote: | Originally posted by digi01
optmize version,including input buffer.
the pdf file show top and silk layer;) |
Do you not have ANY psu decoupling caps on the mainboard?:eek: |
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| digi01 |
| The main board was not set up any bypass caps.I have leave a series holes near the chips for mounting the mother rails of power supply. |
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| rabstg |
| quote: | Originally posted by digi01
ver#1.0 source share.
try upload my BPA200 gerber files.can anybody give me a rank:D
enjoys |
Hey digi01-
Will you be offering these boards for sale too?
I have the perfect chassis for a pair! |
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| digi01 |
| quote: | Originally posted by rabstg
Hey digi01-
Will you be offering these boards for sale too?
I have the perfect chassis for a pair! |
rabstg,thank you for your interest.I am not very satisfied with the layout.this project has been stopped temporarily.if there are a lot of interested,I will continue revising it and offering PCB.
Zang |
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| rabstg |
Hi Zang-
Ok.. If you do persue this project and eventually have boards made please send me a set and a bill. |
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| sklimek |
| quote: | Originally posted by rabstg
Hi Zang-
Ok.. If you do persue this project and eventually have boards made please send me a set and a bill. |
"Ditto" as well...
Best - Stan |
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| bucurb |
| Do you have images of your BPA 200 pcb project, please? |
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| mwmkravchenko |
Definitely interested in how this turns out! Your design may finally get me off my butt and build one of these.
Mark |
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| digi01 |
thank you:)
It is early when I saw BPA-200_Application_Note of NS,I had a good mind to design a pcb board for myselfs interest.Later NS released AN1192 article again,but there is still not a official layout available.So I think this layout of DIY to have realistic meaning.
my project is total base on these two articles of NS.the BOM list is same.
Bridge/Parallel Amplifier (BPA-200) Documentation
AN1192
At the same time I will thank DIYAUDIO, this LAYOUT revised is a New Year present that I gave DIYAUDIO. |
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| digi01 |
| quote: | Originally posted by bucurb
Do you have images of your BPA 200 pcb project, please? |
I have not manufacture the board.I accept pre-order(over 20PCBs)then I will work them out.
the attached photo is the final board silk layer,double side board,160x33mm.you can build BA100/PA100/BPA200 AMP.
if you have interest,can drop me a mail.
enjoys
ZANG |
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| digi01 |
| quote: | Originally posted by bucurb
Do you have images of your BPA 200 pcb project, please? |
I have got the boards a moment ago:cool:
the upper thing of the photo is a chinese pencil;) the PCB size is 160x33mm.
Zang |
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| thomas997 |
| quote: | Originally posted by digi01
thanks diyaudio:D |
hah that looks great. |
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| TS Lo |
Hi Zang,
I like to have two boards,
please count me in.
Thanks
TS |
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| digi01 |
you are welcome.PM sending...:cool:
Z |
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| rabstg |
Hi Zang-
If I'm reading this correct, you have had boards made.
May I get a pair of them?
And are you selling a parts "kit" also?
I think they will go very well in my chassis. |
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| sklimek |
Hi Zang, they look great! Thank you for your hard work and sharing. Can't wait to get my two boards.
Best - Stan |
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| rabstg |
| quote: | Originally posted by digi01
the upper thing of the photo is a chinese pencil;) Zang |
Zang you know I love your work, but I have to pick on you..
So what's the difference between a Chinese pencil and a "regular" pencil? I would assume just the decorations on the out side?
I'm glad to see you active on the forum again. :) |
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| BrianGT |
Zang,
Looks great, just as your previous boards!
I look forward to trying this out :)
--
Brian |
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| transducer |
Hi Zang,
I'd like to know how much for 2 boards would be including shipping to Canada.
Thanks!
Ron |
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| digi01 |
thanks all:) I am happy!
and sorry for slow response,I am very busy for spring exam.hopefully it could be passed smoothly:smash:
P.S.
here is PDF version,including some others project.
http://digi01.hk.st
Z |
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| motherone |
Digi,
Have you considered doing a BPA layout using the 4780? Half the chips would be needed!
Mike |
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| slackman |
Maybe half the chips but the thermal power for one lm4780 can reach values so that your'e in need of a cooling fan. It's much better to spread the power discipation to more chips!
(For ex. you can't use the LM4780 in bridged configuration without a fan:whazzat:. Even a giant heatsink couldn't take all the heat the LM4780 produces in bridged mode; the contact area of the chip is too small. For me only PA-equipment should be cooled with a fan.) |
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| motherone |
| quote: | Originally posted by slackman
Maybe half the chips but the thermal power for one lm4780 can reach values so that your'e in need of a cooling fan. It's much better to spread the power discipation to more chips!
(For ex. you can't use the LM4780 in bridged configuration without a fan:whazzat:. Even a giant heatsink couldn't take all the heat the LM4780 produces in bridged mode; the contact area of the chip is too small. For me only PA-equipment should be cooled with a fan.) |
Making two boards, each paralleling three chips ("6" total), then bridging the two boards, should be able to handle it. Or if you don't feel like getting that fancy, parallel 2 chips ("4" amps total), then bridge those.
I know there are some folks using BrianGT's LM4780 kit in BPA without fans. |
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| digi01 |
| quote: | Originally posted by motherone
Digi,
Have you considered doing a BPA layout using the 4780? Half the chips would be needed!
Mike |
thank you,I would not take more time on chip amp.I am going to digital & solid :)
P.S.
All per order has send out,feel happy to test it and post your review and comment. THANKS:cool:
Zang |
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| digi01 |
mine bpa200 is in progress.
case and heatsink below. |
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| digi01 |
chips detail,
I have order all parts,Now waiting them arrived. |
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| TS Lo |
Hi Zang,
I'm still waiting for arrival of my boards, however
when I trace the copper track on the PCB in the photos
attached in Post 18, it indicates that the U7 output is
connected to the NI input (pin 10 via pin 11) of all 4
power chips (U1 - U4).
Please clarify
Thanks
TS |
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| digi01 |
| quote: | Originally posted by TS Lo
when I trace the copper track on the PCB in the photos
attached in Post 18,... |
thank you mention it:)I have got a big prize:bawling: the eval board has a bug.I have check out it.
rgds
Zang |
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| peranders |
| How has this project gone? Is the pcb debugged and running? |
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| digi01 |
P-A,the pcb has completed debugged,I have made some fine boards.
Zang |
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| mwmkravchenko |
[/FONT] Where are the pictures????? :D :D :D :D :D :D :D :D :D :D :D
MArk |
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| mwmkravchenko |
Where are the pictures????? :D :D :D :D :D :D :D :D :D :D :D
MArk |
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| digi01 |
for someone ask for cam,
the source file attached,feel free to use it:)
Zang
Btw,mine bpa200 will completed soon. |
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| mwmkravchenko |
Much Appreciated!
MArk |
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| PierreG |
| I tried to see the gerber files on a gerber viewer but I only seem to view one layer of the pcb. Can you post some PDF or gif. of the two layers separately please? |
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| digi01 |
you are welcome:)
1 |
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| PierreG |
Thank you very much Zang.
That is fast ;)
Can you tell us about the one you build? How is the sound quality? |
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| PierreG |
| Can you also post the 2 layers without the silkscreen or components please? |
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| vixr |
| digi01, I will be watching for your posts more carefully... You have very nice PCBs... The current buffer board is awesome. Do you have a list of board you offer? Thanks for the MJ amp board... Sent money today...:D |
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| rabstg |
Zang is quite good and thus quite popular.. He is participating in MANY threads but this is a hobby for him.. He does this in his spare time.
Please be patient with him as I'm sure his work and social obligations FAR outweigh his hobby time. Oh yea, he has to sleep too...
As any sane person would do, if the hobby gets too hectic sometimes it's necessary to step away from it a bit. But... Zang is addicted to this hobby just like the rest of us... He HAS to return... :D |
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| jleaman |
| quote: | Originally posted by digi01
mine bpa200 is in progress.
case and heatsink below. |
Digi where did you get that case ? Can you get more >? |
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| vixr |
| It appears to be well worth the wait... A not too in depth search of 3 different forums, turns up plenty of Zang's influence... I hope he has more stuff for sale...:D |
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| digi01 |
to PierreG and all,thanks!
top+silk+bottom layer attached. |
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| digi01 |
to jleaman,
I buy the case from beijing.I think I can get more.but the case is over heavy >>2Kg.it is not good for a international supply:(
Zang |
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| JeroenVl |
Hi Zang,
Received the boards today and they look absolutely Great. :D :D
But I do have some questions:
1- I see on your board that CBY5 and CBY2 are placed on the board but are not directly connected to each other but they are all connected to one of the supply pins of the LM3886. Am I right to assume you want me to use external wirering to connect all Capacitors and power supply pins? If possible please post a picture, because there are some connection points underneath components and I am not sure if I need does or not.
2- I also see on your board there are 7 CBY1. Did you put all 7 on your board or only 3 like in the AN-1192 description and used external wirering for powering U5 and U6. Or is putting all 7 on there improve the end result.
3- Which capacitors did you use for CBY1 and CBY2 because if have not found any who could fit in the available space. :bawling: :bawling:
4- For Rm and Cm. I saw on other posts that the advice for Rm is 33k and for Cm 100uF. Is this correct? Also am I correct to assume the Cm only needs to be 6,3V, so 100uF/6.3V.
Tnx,
Jeroen |
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| traw |
Curious about the schematic - interested in building this one and not having to use drv134 approach. Is it correct to assume the schematic is the same as the 'basic' bpa200 mentioned in the application note pdf (and carlos's mention of no servo) ?
Any need for the op amp up front of it all? Does one have to worry about NS stating the 0.1 ballast resitors needing to be very closely matched? |
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| digi01 |
| quote: | Originally posted by JeroenVl
But I do have some questions:Jeroen [/B] |
1- Am I right to assume you want me to use external wirering to connect all Capacitors and power supply pins?
///Yes,the board need setup 2 strong mother rail for 4 * lm3886 supply.the mother rail can be setup at the bottom of the board.
2- I also see on your board there are 7 CBY1. Did you put all 7 on your board or only 3 like in the AN-1192 description and used external wirering for powering U5 and U6. Or is putting all 7 on there improve the end result.
///Yes,i put all 7 for better psu bypass.
3- Which capacitors did you use for CBY1 and CBY2 because if have not found any who could fit in the available space. :bawling: :bawling:
///I use elna standard series caps.I know the room of the top layer is very tightly.the caps can be setup the bottom.
wish it helps,good luck.
Zang
4- For Rm and Cm. I saw on other posts that the advice for Rm is 33k and for Cm 100uF. Is this correct? Also am I correct to assume the Cm only needs to be 6,3V, so 100uF/6.3V.
Tnx,
| quote: | Originally posted by traw
Curious about the schematic - interested in building this one and not having to use drv134 approach. Is it correct to assume the schematic is the same as the 'basic' bpa200 mentioned in the application note pdf (and carlos's mention of no servo) ?
Any need for the op amp up front of it all? Does one have to worry about NS stating the 0.1 ballast resitors needing to be very closely matched? |
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| digi01 |
to traw,
for the 0.1 ballast resitors:
if you build the bpa200 without dc server configuration the resistors must be be very closely matched or else the amp maybe work for one years but it will going to physical damage.
Zang |
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| youp |
I'm looking to buy a pcb for 4xlm3886 (BPA200), does anyone know where I can get these?
thanks,
Joep |
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| digi01 |
joep,
i think i have few pcs available,i need check my box.
zang |
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| Evilsizer |
:O
i checked your site expecting to see them up there digi! :P i wonder when you can spend more time to offer them up on the site, it would be a nice addition! :) |
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| youp |
Hi Zang,
It would be great if you had 2 pcs available. I also ordered a balanced line driver at your site. Maybe you could ship these things together?
thanks in advance,
Joep |
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