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 Forum index » DIY Hardware and Software » Developers' Corner
How to Choose the right Capacitor
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sonicwarrior



Joined: Dec 22, 2005
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Location: Cologne, Germany
PostPosted: Tue Oct 15, 2013 12:38 pm    Post subject: Reply with quote  Mark this post and the followings unread
rogerlatur wrote:
I mean why not always using a capacitor with the highest voltage value?


Size and price.
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mosc
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Joined: Jan 31, 2003
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PostPosted: Tue Oct 15, 2013 2:15 pm    Post subject: Reply with quote  Mark this post and the followings unread
rogerlatur wrote:

Now what I don't understand is why using 25v when 50v can handle more voltage ? I mean why not always using a capacitor with the highest voltage value ?

No reason not to use a higher voltage rating than necessary, but for size and expense.

When the voltage rating is exceeded, they don't always immediately explode. Some will be fine when used at a voltage higher than identified on the can, but beware, the explosion can happen after a long time, even after years. I built a power supply that I used for two years before the capacitor exploded. It worked fine until then. I didn't use the wrong voltage rating, I accidentally wired in up backwards. Embarassed
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caffeine_addict



Joined: May 15, 2015
Posts: 1
Location: Beaudesert, QLD, Australia
PostPosted: Fri May 15, 2015 4:23 pm    Post subject: Reply with quote  Mark this post and the followings unread
I'm in the process of converting designs to use SMD components, (I'm starting with The Peasants Synthbend for a controller), and am currently stuck on the capacitors. Ray Wilson's Single Bus Keyboard controller circuit calls for a .01uf Polycarbonate or Polystyrene Cap, but it seems in SMD that those two materials (As far as I have found anyway) don't seem to be an option.

I'm wondering how the other film types compare for Sample and Hold circuits, films like PPS and PEN seem to be the most readily available, are they suitable replacements?

Sorry if this is a newb question, I've been scouring the internet for days trying to figure it out, and I'm just not reading anything that makes sense to me sorry.

I know I could just use through hole and be done with it, but I like a challenge, and it tickled my fancy to make an SMD modular.

Thanks in advance.
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ablablablablabla



Joined: Feb 09, 2016
Posts: 7
Location: shitcore
PostPosted: Tue Feb 09, 2016 4:54 pm    Post subject: Re: How to Choose the right Capacitor Reply with quote  Mark this post and the followings unread
jksuperstar wrote:
Slightly older reference, but still holds it's water. Has some very good descriptions about various types of Caps, and when to use them.

http://home.comcast.net/~wjungieee/wsb/Picking_Capacitors_1.pdf
http://home.comcast.net/~wjungieee/wsb/Picking_Capacitors_2.pdf


404


i'd like to read those...


Evil or Very Mad
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blue hell
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Joined: Apr 03, 2004
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PostPosted: Tue Feb 09, 2016 5:07 pm    Post subject: Reply with quote  Mark this post and the followings unread
Read a couple more posts in the thread (till you reach http://electro-music.com/forum/post-99544.html#99544 .. the links there seem to still work) Laughing

Oh, and welcome of course.
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ablablablablabla



Joined: Feb 09, 2016
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Location: shitcore
PostPosted: Tue Feb 09, 2016 5:11 pm    Post subject: Reply with quote  Mark this post and the followings unread
Blue Hell wrote:
Read a couple more posts in the thread (till you reach http://electro-music.com/forum/post-99544.html#99544 .. the links there seem to still work) Laughing

Oh, and welcome of course.


oh, yeah.. lol.


and thank you, glad to be here. been lurking for a while and didn't know where to drop my 1st post so i thought a quick brainless one would be the best.

hello!
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VA1



Joined: Aug 20, 2018
Posts: 98
Location: Nederland
PostPosted: Wed Jun 19, 2019 9:24 am    Post subject: Reply with quote  Mark this post and the followings unread
Size, check the dimensions, if it dont matters then i choose the highest, they last longer.
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J-chot



Joined: Jan 20, 2014
Posts: 44
Location: Decatur AL
PostPosted: Wed Oct 16, 2019 11:02 am    Post subject: Reply with quote  Mark this post and the followings unread
All the links are dead now...
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blue hell
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PostPosted: Wed Oct 16, 2019 3:26 pm    Post subject: Reply with quote  Mark this post and the followings unread
Messy eh .. I found 'm "somewhere" .. and I'm going to commit a coyright crime by just uploading 'm here ... Shocked

These seem to be the original ones.

Picking_Capacitors_1.pdf
 Description:
picking caps 1

Download (listen)
 Filename:  Picking_Capacitors_1.pdf
 Filesize:  1.95 MB
 Downloaded:  587 Time(s)
Picking_Capacitors_2.pdf
 Description:
picking caps 2

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 Filename:  Picking_Capacitors_2.pdf
 Filesize:  1.14 MB
 Downloaded:  604 Time(s)

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Jan
also .. could someone please turn down the thermostat a bit.
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Grumble



Joined: Nov 23, 2015
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PostPosted: Thu Oct 17, 2019 2:28 am    Post subject: Reply with quote  Mark this post and the followings unread
Thanks Jan!
I love vintage stuff Laughing
Though they were printed in 1980, I think a lot still is valid, but one must take into account that there a at least "some" improvements made in 40 years Wink
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mosc
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PostPosted: Fri Oct 18, 2019 1:52 pm    Post subject: Reply with quote  Mark this post and the followings unread
After 39 years, maybe fair use law applies. The sources are cited directly in the attachments. When we are contacted by copyright holders we almost always take things down promptly; so read and memorize. Smile
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J-chot



Joined: Jan 20, 2014
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PostPosted: Sat Oct 19, 2019 12:50 am    Post subject: Reply with quote  Mark this post and the followings unread
It's easier to beg forgiveness than ask permission in these matters...
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