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Old 17th June 2017, 07:25 PM   #901
laverda is offline laverda  United Kingdom
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Out of interest, what is the preferred 22uF output cap other than a litic ?? Film/Polyprop?

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Old 17th June 2017, 07:53 PM   #902
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Hi,
Where did you get the self-adhesive mu-metal sheet? I want to install it to my pearl 2.

Regards

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Originally Posted by folkdeath95 View Post
Thanks.

The white thing in the case is self-adhesive mu-metal sheet.
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Old 17th June 2017, 08:22 PM   #903
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Mumetal, Nikel Permalloy, Magnetic shielding foil, Sheet, Mu-metal 0.1T-a | eBay
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Old 17th June 2017, 10:50 PM   #904
Eric is offline Eric  United States
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Quote:
Originally Posted by laverda View Post
Out of interest, what is the preferred 22uF output cap other than a litic ?? Film/Polyprop?

TIA
You'll have a tough time finding anything but a litic in 22uF size, but I found this cap unnecessary after adding a cap in series with R14 to ground. Just lift the ground side of R14 and connect to the + lead of the cap and the - lead goes to ground. A bipolar cap would work here also but a standard electrolytic will work.

See the discussion here
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Old 18th June 2017, 02:11 AM   #905
wayne is offline wayne  United States
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I like the mu metal shielding a nice touch and it does help.
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Old 18th June 2017, 07:23 AM   #906
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Quote:
Originally Posted by Eric View Post
You'll have a tough time finding anything but a litic in 22uF size, but I found this cap unnecessary after adding a cap in series with R14 to ground. Just lift the ground side of R14 and connect to the + lead of the cap and the - lead goes to ground. A bipolar cap would work here also but a standard electrolytic will work.

See the discussion here
You can find polypro, PIO, etc... caps in 22F, but they are huge. But if Laverda has enough place in his box, he can try.

I understood that this output cap was a high-pass filter to prevent any DC to go to the next component (preamp, amp, etc...). I suppose it's possible to get rid of it if you have a input cap in your preamp, but I didn't know that the cpa in serie with R14 had the same effect.

Concerning this cap: given that R14 sets the gain, does adding a cap in serie with it changes something in the gain?
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Last edited by folkdeath95; 18th June 2017 at 07:26 AM.
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Old 18th June 2017, 07:24 AM   #907
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Quote:
Originally Posted by wayne View Post
I like the mu metal shielding a nice touch and it does help.
Thanks Wayne.
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Old 18th June 2017, 10:45 AM   #908
laverda is offline laverda  United Kingdom
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Quote:
Originally Posted by Eric View Post
You'll have a tough time finding anything but a litic in 22uF size, but I found this cap unnecessary after adding a cap in series with R14 to ground. Just lift the ground side of R14 and connect to the + lead of the cap and the - lead goes to ground. A bipolar cap would work here also but a standard electrolytic will work.

See the discussion here
...all clear now...I've already done the C in series with R14, so I'll whip out the 22uf and see.... Many thanks.
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