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 Forum index » DIY Hardware and Software » The layout factory
What is best practice?
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rogerlatur



Joined: Dec 22, 2012
Posts: 116
Location: france

PostPosted: Wed Jun 19, 2013 10:35 am    Post subject: What is best practice? Reply with quote  Mark this post and the followings unread

When doing DIY own projects connected to +15/0/-15v should I always
1) put capacitors between +/- and ground ?
Posted Image, might have been reduced in size. Click Image to view fullscreen.

If you look at the following 2 pictures, is it better to :
2a) add beads/caps after +/- or
2b) leave without ?
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Or should I always do 1) + 2a) ? Always adding beads/caps and also caps between +/-/ground.
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-minus-



Joined: Oct 26, 2008
Posts: 750

Audio files: 13

PostPosted: Wed Jun 19, 2013 11:05 am    Post subject: Reply with quote  Mark this post and the followings unread

I guess the best would be to have beads where the power enters the board, then have some larger electrolytic capacitors, say 100uF close to them. The 0.1uF caps should be as close to the IC power pins as possible and on each IC in the circuit.

EDIT: If you look at your first drawing and check it with the schematic above it, the 0.1uF capacitors need to go from each power pin of the IC to GROUND, not through them.
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rogerlatur



Joined: Dec 22, 2012
Posts: 116
Location: france

PostPosted: Thu Jun 20, 2013 10:14 am    Post subject: Reply with quote  Mark this post and the followings unread

-minus- wrote:
I guess the best would be to have beads where the power enters the board, then have some larger electrolytic capacitors, say 100uF close to them. The 0.1uF caps should be as close to the IC power pins as possible and on each IC in the circuit.

EDIT: If you look at your first drawing and check it with the schematic above it, the 0.1uF capacitors need to go from each power pin of the IC to GROUND, not through them.

It is good then that I asked here. I learned something important. Thank you !

If anybody has an idea where I could look at (a link maybe) to learn this kind of basics and their meanings, it would be really great !
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