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 Forum index » DIY Hardware and Software » Thomas Henry designs
Help choosing capacitors for QuadBass++
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bassFant



Joined: Jul 31, 2013
Posts: 3
Location: Germany

PostPosted: Wed Jul 31, 2013 5:22 pm    Post subject: Help choosing capacitors for QuadBass++ Reply with quote  Mark this post and the followings unread

Could someone help me selecting the right capacitors? The electrolytics are not a problem, but I've no idea what mylars are... Could someone point me in the right direction? Possibly with part numbers from Mouser and Co.?!

From the parts list:

All capacitors are 16V unless noted.
C1 0.001 uF mylar -> 5mm
C2 0.0047 uF mylar -> 5mm
C3 – C6 0.01 uF disc -> 5mm
C7 0.01 uF mylar -> 5mm
C8 – C10 0.1 uF mylar ->5mm
C11 – C15 2.2 uF electrolytic -> 2,5mm
C16, C17 10uF electrolytic -> 2,5mm

Any help appreciated! Thanks a lot!
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bassFant



Joined: Jul 31, 2013
Posts: 3
Location: Germany

PostPosted: Sun Sep 07, 2014 1:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

Anybody?
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elmegil



Joined: Mar 20, 2012
Posts: 1522
Location: Chicago
Audio files: 14

PostPosted: Sun Sep 07, 2014 6:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sorry, I would normally have responded, but I've been overwhelmed with other stuff....

Capacitors have different types of dielectric in between two plates of metal. Sometimes these are more "foil" than "plates" but the concept is the same: a gap between two pieces of conductive material creates the capacitive effect, and the material that fills that gap changes how the capacitor behaves.

Your bog standard capacitors (the brown discs) use ceramic. There are other types of ceramic capacitors that are in some cases better (C0G caps are quite good, generally as good as film types). Some of the higher quality ones that aren't ceramic use films of various types of plastics, hence polyester, polystyrene, polypropylene. And Mylar....

A common type of mylar capacitor is the "greenie" by xicon:

http://www.retroamplis.com/epages/62070367.sf/en_GB/?ObjectPath=/Shops/62070367/Products/C-XICONGREEN/SubProducts/C-XICONGREEN-0.001uF

There are a number of other sources besides retroamplis, but they had a nice picture Smile

Another common type of film capacitor are the WIMA "box" capacitors:

http://www.mouser.com/search/refine.aspx?Ntk=P_MarCom&Ntt=135745314&utm_source=supplier&utm_medium=featured+spotlight&utm_campaign=135745314

Ultimately, any of the film capacitors should be fine for the QB++. I used WIMA films myself, see the attached photo. Still waiting to make a panel for mine....

And as Ian Fritz pointed out to me some time ago Smile, C0G ceramic capacitors would also be just fine, they perform as well as the films. Just don't use MLCC or standard ceramic disc caps.


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bassFant



Joined: Jul 31, 2013
Posts: 3
Location: Germany

PostPosted: Mon Sep 08, 2014 3:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi elmegil,

nothing to excuse! Your post is very helpful for me. If someone had told me before that the green capacitors are just called "greenie".... Now I know what I have to search for. But the red WIMA MKS are more common in Germany, so maybe I will use them like you if they work. What are the grey ones you used at C1, C2, C7?
Thanks a lot!
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khakifridge



Joined: Jul 15, 2014
Posts: 10
Location: UK

PostPosted: Wed Sep 10, 2014 1:14 am    Post subject: Reply with quote  Mark this post and the followings unread

bassFant wrote:
What are the grey ones you used at C1, C2, C7?


They're just polyester film caps. I guess we're more used to seeing the yellow ones, but grey are common too (e.g. from Tayda).
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elmegil



Joined: Mar 20, 2012
Posts: 1522
Location: Chicago
Audio files: 14

PostPosted: Wed Sep 10, 2014 5:25 am    Post subject: Reply with quote  Mark this post and the followings unread

khakifridge wrote:
bassFant wrote:
What are the grey ones you used at C1, C2, C7?


They're just polyester film caps. I guess we're more used to seeing the yellow ones, but grey are common too (e.g. from Tayda).



Yup. Got mine from Mammoth Electronics, actually. Just a variation from the red WIMA's because I didn't have the value in those.
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