ceramic capacitors ? - Page 4

Tenson · 24th August 2012, 12:02 AM

Dragging up an extremely old thread; is it worthwhile using NP0 type caps for bypassing op-amp supply rails, as opposed to more common ceramic caps like X7R? Is the difference only really shown in the audio signal path?

serengetiplains · 24th August 2012, 12:05 AM

I'd bypass them. The better ceramics clean up supply rail fluctuations better.

AndrewT · 24th August 2012, 10:43 AM

the x7r are probably working just fine.

I can't see what advantage an NP0 could bring in local decoupling.

theAnonymous1 · 24th August 2012, 10:52 AM

My understanding is that X7R caps are "lossy" and NP0 are not. The lossy quality of the X7R is what makes it good at suppressing noise.

DF96 · 24th August 2012, 11:24 AM

Yes, that is my understanding too. The slight RF lossiness of the bigger ceramic caps means that parasitic impedances and resonances in PCB traces are not merely retuned (as an NP0 would do) but damped away. As always, use the appropriate cap for the job and ignore myths and fashions about 'good' and 'bad' audio caps.

Tenson · 24th August 2012, 12:10 PM

Thanks for the replies!

24th August 2012, 10:52 AM	#34
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	My understanding is that X7R caps are "lossy" and NP0 are not. The lossy quality of the X7R is what makes it good at suppressing noise. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ceramic capacitors ....	sakis	Solid State	189	16th April 2009 07:26 PM
Flat round and old ceramic disc capacitors	AndrewGM	Parts	1	6th October 2008 10:19 PM
what is the difference between silver mica capacitors and ceramic capacitors ??	prorms	Solid State	1	6th May 2008 12:38 PM
life lesson on ceramic capacitors in signal path	mazurek	Parts	11	23rd February 2006 04:00 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

24th August 2012, 12:02 AM	#31
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	Dragging up an extremely old thread; is it worthwhile using NP0 type caps for bypassing op-amp supply rails, as opposed to more common ceramic caps like X7R? Is the difference only really shown in the audio signal path?

24th August 2012, 12:05 AM	#32
serengetiplains diyAudio Member Join Date: Feb 2004 Location: Canada	I'd bypass them. The better ceramics clean up supply rail fluctuations better.

24th August 2012, 10:43 AM	#33
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	the x7r are probably working just fine. I can't see what advantage an NP0 could bring in local decoupling.

24th August 2012, 11:24 AM	#35
DF96 diyAudio Member Join Date: May 2007	Yes, that is my understanding too. The slight RF lossiness of the bigger ceramic caps means that parasitic impedances and resonances in PCB traces are not merely retuned (as an NP0 would do) but damped away. As always, use the appropriate cap for the job and ignore myths and fashions about 'good' and 'bad' audio caps.

24th August 2012, 12:10 PM	#36
Tenson diyAudio Member Join Date: Feb 2006 Location: Kent	Thanks for the replies!