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Old 10th November 2009, 10:27 PM   #1
nad is offline nad  United Kingdom
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Default Recommended output caps?

Hello,

Can anyone out there recommend any output caps?
I'm using LME49720HA opamps and replaced the 'stock' caps with 25v 47uf Rubycon ZA's, then after a while bypassed them.

Theres nothing wrong but it just seems to have lost something. I doubt the Rubys are ideal for the job so any help??

My purchase would probably be from Farnell, I know Black Gates and Mundorfs aren't available there but if there's anything on their site which could be good, a part number would be great.


Ta.....

Last edited by nad; 10th November 2009 at 10:31 PM.
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Old 11th November 2009, 02:19 AM   #2
amc184 is offline amc184  New Zealand
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It depends of a few things. One of the main things is how much capacitance you actually need. A lot of the time electrolytic coupling capacitors are specified with ten times the capacitance needed. Have a look at wikipedia's article on high pass filters, and chose a value of capacitance so that fc is between 1 and 3Hz.

If you want to stick with electrolytics, your be bet is a Blackgate. Take a look at the Parts Connexion store, Farnell doesn't stock many 'audio specific' brands.

The best thing to do however is to replace it with a plastic film cap. However, space restrictions may not allow this.
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Old 11th November 2009, 02:33 AM   #3
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try pannasonic fm back to back (minus poles together)
that gives a bipolar capacitor with half value and much lower distortion.
i would bypass it with a 0.01 - 0.1uF Vishey-Röderstein MKP they make 1% tolerance parts that are awailable from Farnell
the best grade of black gate bipolar is good too but i think modern electrolytics are so good that you can safe the money without ill effect
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Old 11th November 2009, 02:38 AM   #4
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if you use an electrolytic the value has to be much bigger then a foil cap because they tend to distort in the deeper ranges esr is also lower in bigger elcaps so is leakeage current so a compromise has to be struck pannasonic fm have low leakeage but there is a part from elna (i forgot the name maybe rhe) that has even lower leakeage and is made for audio as the blurb says
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Old 11th November 2009, 04:28 PM   #5
Mooly is offline Mooly  United Kingdom
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Panasonic ECA range are good,
Your Search Results | CPC

I suspect you may be expecting to much and that the sound hasn't really deteriorated, more your expectation are so high Was it better before you replaced the opamps ?
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Old 11th November 2009, 06:14 PM   #6
nad is offline nad  United Kingdom
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Quote:
Originally Posted by amc184 View Post
It depends of a few things. One of the main things is how much capacitance you actually need. A lot of the time electrolytic coupling capacitors are specified with ten times the capacitance needed. Have a look at wikipedia's article on high pass filters, and chose a value of capacitance so that fc is between 1 and 3Hz.

If you want to stick with electrolytics, your be bet is a Blackgate. Take a look at the Parts Connexion store, Farnell doesn't stock many 'audio specific' brands.

The best thing to do however is to replace it with a plastic film cap. However, space restrictions may not allow this.
Thank you, I think plastic caps are the way. I've started an ammended/new thread with a diagram here: Help to 'better' output schematic??
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Old 11th November 2009, 06:16 PM   #7
nad is offline nad  United Kingdom
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Quote:
Originally Posted by Mooly View Post
Panasonic ECA range are good,
Your Search Results | CPC

I suspect you may be expecting to much and that the sound hasn't really deteriorated, more your expectation are so high Was it better before you replaced the opamps ?
Thank you, I may be expecting too much and no, the ouput wasn't better before the replacement opamps. I've started an ammended/new thread with a diagram here: Help to 'better' output schematic??
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Old 11th November 2009, 06:18 PM   #8
nad is offline nad  United Kingdom
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Quote:
Originally Posted by Joachim Gerhard View Post
if you use an electrolytic the value has to be much bigger then a foil cap because they tend to distort in the deeper ranges esr is also lower in bigger elcaps so is leakeage current so a compromise has to be struck pannasonic fm have low leakeage but there is a part from elna (i forgot the name maybe rhe) that has even lower leakeage and is made for audio as the blurb says
Thank you for your reply, I think plastic caps are possibly the way. I've started an ammended/new thread with a diagram here: Help to 'better' output schematic??
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