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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
Posts: 251
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
Posts: 17726
Location: Allentown, PA
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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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