Hi,
I just build my first LM3886 composite board by my own, to learn, test, measure and all about that.
I do in front of the LM and its composite OP an passive EMI "modul" with OP to filter all about e.g. 40 Khz.
theoretical you see here:
https://www.radiolocman.com/review/article.html?di=335613 FIGURE 2
But Please, do not discuss about that wat I do and ask , I told it in the past, its to learn for my about technical possibilities.😉
So all is now 99% finished, but one last question is not clear for my.
As you all know , for using a LM3886 there is in the front a 1µF up to 4,7µF DC blocker condesator.
Ok, so far, if i use an EMI circuit in front of all ... must I place the 4,7µF before the EMI modul or behind ?
So what is better or right ? Where are the better place for the 4,7µF
--||-- = C 4,7µF
1) AudioInput ...... --||-- ..... passive EMI with diff. OP .... OP of composite LM ........ LM33386
or
2) AudioInput ...... passive EMI with diff. OP ...... --||-- .... OP of composite LM ........ LM33386
or this one :
3) AudioInput ...... --||-- ....... passive EMI with diff. OP ...... --||-- .... OP of composite LM ........ LM33386
kind regards and thanks for helping and discussing 1,2 or 3 ...😍👍
I just build my first LM3886 composite board by my own, to learn, test, measure and all about that.
I do in front of the LM and its composite OP an passive EMI "modul" with OP to filter all about e.g. 40 Khz.
theoretical you see here:
https://www.radiolocman.com/review/article.html?di=335613 FIGURE 2
But Please, do not discuss about that wat I do and ask , I told it in the past, its to learn for my about technical possibilities.😉
So all is now 99% finished, but one last question is not clear for my.
As you all know , for using a LM3886 there is in the front a 1µF up to 4,7µF DC blocker condesator.
Ok, so far, if i use an EMI circuit in front of all ... must I place the 4,7µF before the EMI modul or behind ?
So what is better or right ? Where are the better place for the 4,7µF
--||-- = C 4,7µF
1) AudioInput ...... --||-- ..... passive EMI with diff. OP .... OP of composite LM ........ LM33386
or
2) AudioInput ...... passive EMI with diff. OP ...... --||-- .... OP of composite LM ........ LM33386
or this one :
3) AudioInput ...... --||-- ....... passive EMI with diff. OP ...... --||-- .... OP of composite LM ........ LM33386
kind regards and thanks for helping and discussing 1,2 or 3 ...😍👍
Last edited:
I guess I am too visual, as can't quite grasp your question without pictures.
If I follow, I would do #1 as that eliminates any DC concerns on the EMI filter and I woudl want the filter as close to the amp pins as I could get it.
If I follow, I would do #1 as that eliminates any DC concerns on the EMI filter and I woudl want the filter as close to the amp pins as I could get it.
of course picture is better, but upload makes actually trouble, don´t know why.
I ask for the best place of the DC block C, :
Each Text between the "..." is a modul part. I thing if you take a normal composite schematic you can simple understand.
Do the part ( Figure 2) of the link above in front of a normal composite schematic, then you have it...
I know describing is more difficullt as viewing, but sorry, upload doesn´t work from my this moment