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Old 23rd May 2004, 09:54 AM   #1
red is offline red  Romania
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Default Stupid question

Hello I am building the esp subwoofer filter :
http://sound.westhost.com/project48.htm and my problem is how could I use polarised capacitors to make a nonpolarised capacitor of 4.7uF that is very large about 5 cm long and 1cm wide.The only ones I could find were rated 400 Volts and had those dimensions.
Is this posible to achive? Thanks
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Old 23rd May 2004, 10:01 AM   #2
Bricolo is offline Bricolo  France
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Why do you want to use polarised caps for this?

Use a film cap, polypropylene would have the size you want
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Old 23rd May 2004, 10:04 AM   #3
red is offline red  Romania
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I know that there are this kind of capacitors but I can't find any to buy...I went to 3 diferent stores and didn't have any that the huge ones, and any polarised capacitors.And this is why I asked the question...
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Old 23rd May 2004, 11:15 AM   #4
destroyer X is offline destroyer X  Brazil
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Default Put two condensers in series.

Take two electrolitic condensers, the one that have polarization, put plus with plus, or minus with minus.... two 10 uf units will make a non polarized 5 uF....... also two 22 uf will make one non polarized 11 uf....if big values.... you will have some inductance because internal condenser construction is alike a coil.... this way you put a parallel 0.1 parallel unit with them to guaranteed hi frequency will pass..... coil an make some resistance to hi frequencies.

Carlos
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Old 23rd May 2004, 03:37 PM   #5
destroyer X is offline destroyer X  Brazil
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Default I forgot voltage.

When you put two condenser in series, the voltage capacity doubles.
This way, two 10uf / 50 Volts condenser will make one unipolar, or no polarized, of 5uF / 100 Volts.

Normally, measuring the capacity is always bigger, and the voltage capacity also.

If sound better or worst, i cannot say, but it will work.

Carlos
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Old 23rd May 2004, 04:52 PM   #6
sreten is offline sreten  United Kingdom
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Default Re: I forgot voltage.

Quote:
Originally posted by destroyer X
When you put two condenser in series, the voltage capacity doubles.
This way, two 10uf / 50 Volts condenser will make one unipolar, or no polarized, of 5uF / 100 Volts.

Carlos
Hardly the point when putting two unipolars back to back.

Two 50V unipolars make one 50V bipolar,
DC ratings, for AC ratings degrade to 35V.

sreten.
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Old 23rd May 2004, 08:49 PM   #7
destroyer X is offline destroyer X  Brazil
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Default In real world practice

I and other milions are making this conections without explosions, may be luck! (this is ironic...yeaaah!)

Carlos
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Old 23rd May 2004, 08:51 PM   #8
red is offline red  Romania
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Thanks all for replying guys!!!You have been very helpfull.
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Old 23rd May 2004, 09:03 PM   #9
destroyer X is offline destroyer X  Brazil
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Default You are welcome!

Was happy to help you in something.

Regards,

Carlos
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