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 Forum index » DIY Hardware and Software » YuSynth
Power supply decoupling?
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gdavis



Joined: Feb 27, 2013
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PostPosted: Mon Apr 29, 2013 11:31 am    Post subject: Power supply decoupling?
Subject description: Decoupling multiple modules on a single PCB
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Each of the YuSynth modules have electrolytic decoupling caps on the power supply input, I get this. However, I want to combine several modules on to one board and can't quite wrap my head around how I should handle the power supply decoupling.

Would it be appropriate to just have one set of decoupling caps at the power input to the board, or should I still maintain the individual power decoupling for each module?

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Uncle Krunkus
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PostPosted: Wed May 01, 2013 6:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Keep it separately for each module on the module's board. These are like little reservoirs of power for each module, if you combine them, or re-locate them, the contamination of one module's earth from the others only goes up, not a good thing. Smile
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gdavis



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PostPosted: Fri May 03, 2013 1:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks, that's exactly what I was thinking as well, but wasn't sure if that was really an issue or if the decoupling was there just to deal with connector resistance.

Which then leads me to the question if I have the PS decoupling at each module, do I need additional decoupling at the boards PS connector or should I just go straight from the board connector to each modules PS branch?

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Uncle Krunkus
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PostPosted: Sun May 05, 2013 5:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm not really sure what you're asking.
Each module has it's own decoupling caps on the board yeah?
End of story. I think,.....
But maybe I'm not seeing it the way you are.

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gdavis



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PostPosted: Tue May 07, 2013 6:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

See the two attachments. Wondering if the 2 caps at the power connector in blaha are necessary or is blahb the way to go?

Though at this point I think I'm going to put a 7XL15 pair on each board which makes the question moot.


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blahb.png
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blahb.png



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Uncle Krunkus
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PostPosted: Wed May 08, 2013 1:04 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, go with blahb.
Look at it like a lowpass filter. (ie, the series resistance of the wires comes first, then you hit the caps, which are right next to, (preferably on) the module boards)

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