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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
echo rockit - why bipolar electrolytic caps?
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okelk



Joined: May 08, 2014
Posts: 8
Location: Vienna

PostPosted: Thu May 08, 2014 7:19 pm    Post subject: echo rockit - why bipolar electrolytic caps? Reply with quote  Mark this post and the followings unread

Hi! I'm new here. Very Happy
I've been on the muffwiggler forum for some time now, and since I'm getting more and more into diy I thought this is the right place for me.

I recently started to build a echo rockit. (not finished yet....I ran out of parts...) And since I very rarely come by these parts I'm wondering: Why are there bibolar electrolytic caps used for dc blocking?
Are they for this specific purpose better than e.g film caps? and if so why?

Also: Is it ok to replace the tantalums with regular electrolytic caps?
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Blue Hell
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Joined: Apr 03, 2004
Posts: 20473
Location: The Netherlands, Enschede
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PostPosted: Fri May 09, 2014 11:37 pm    Post subject: Re: echo rockit - why bipolar electrolytic caps? Reply with quote  Mark this post and the followings unread

welcome okelk

okelk wrote:
Why are there bibolar electrolytic caps used for dc blocking?

They provide a cheap way to get large values, so it is a compromise. you can use two polarized electroytics of double the value put back to back (+ to + or - to - .. does not matter) to make a non polarized one.

Quote:
Also: Is it ok to replace the tantalums with regular electrolytic caps?

For analog audio stuff that'd be fine.

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okelk



Joined: May 08, 2014
Posts: 8
Location: Vienna

PostPosted: Sat May 10, 2014 4:48 am    Post subject: Re: echo rockit - why bipolar electrolytic caps? Reply with quote  Mark this post and the followings unread

Thanks!

Blue Hell wrote:

They provide a cheap way to get large values, so it is a compromise.


Hm..that was why I was wondering...It totally makes sense that there is a 10uF bipolar cap, but the 1uF bipolar caps made me wonder...
Where I buy my stuff they don't even have bipolar electrolytics that small and 1uF foil capacitors are much cheaper...

Blue Hell wrote:

you can use two polarized electroytics of double the value put back to back (+ to + or - to - .. does not matter) to make a non polarized one.


That's what I did for the large 10uF one. seems to work fine. it's 11uF now though (22uf+22uf).

I don't see any reason why foil caps shouldn't work...I guess I will just try and see how it works...
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Blue Hell
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PostPosted: Sat May 10, 2014 6:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Sure, other caps will work too.
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