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 Post subject: Bipolar from two?
PostPosted: Mar Thu 08, 2018 11:10 pm 
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Location: saint clair shores, michigan
In this schematic, do the 2 caps connected back to back form a bipolar cap? When I look at this arrangement I see an imminent capacitor explosion. Why am I wrong? If they do indeed act as a bipolar cap, my next question would be did they not have bipolar caps in 1975? (That's the year the magazine was printed)


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 Post subject: Re: Bipolar from two?
PostPosted: Mar Thu 08, 2018 11:12 pm 
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Yes, if you look at older bipolar caps, you can see it is a double ended can.

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 Post subject: Re: Bipolar from two?
PostPosted: Mar Thu 08, 2018 11:29 pm 
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https://electronics.stackexchange.com/q ... ectrolytic

They work fine as a non-polarized capacitor. Usually they are identical values.

Two 10 µF capacitor in series like this would yield one 5 µF non-polarized capacitor.

Curtis Eickerman

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 Post subject: Re: Bipolar from two?
PostPosted: Mar Fri 09, 2018 4:39 am 
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Location: Austin, Texas
The main reasons for using two capacitors is that it is a lot easier to find polarized capacitors and two of them will normally cost less than one non-polarized.
Some people will put diodes across the caps to be sure they are only slightly reversed but the two caps without diodes have normal life in my experience.
I have seen low voltage (less than 25 volts) AL electrolytics last 5 years even when installed in reverse polarity. Higher voltage caps usually fail in minutes to hours when reversed.
Reversed tantalum caps go bang almost immediately.


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