for someone ask for cam,
the source file attached,feel free to use it🙂
Zang
Btw,mine bpa200 will completed soon.
the source file attached,feel free to use it🙂
Zang
Btw,mine bpa200 will completed soon.
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?
Thank you very much Zang.
That is fast 😉
Can you tell us about the one you build? How is the sound quality?
That is fast 😉
Can you tell us about the one you build? How is the sound quality?
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...😀
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... 😀
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... 😀
Member
Joined 2002
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...😀
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
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
Supply connection
Hi Zang,
Received the boards today and they look absolutely Great. 😀 😀
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.
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
Hi Zang,
Received the boards today and they look absolutely Great. 😀 😀
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.
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
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?
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?
Re: Supply connection
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.
///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,
JeroenVl said:
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.
///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,
traw said:
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
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
bpa200 kit
I'm looking to buy a pcb for 4xlm3886 (BPA200), does anyone know where I can get these?
thanks,
Joep
I'm looking to buy a pcb for 4xlm3886 (BPA200), does anyone know where I can get these?
thanks,
Joep
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