Capacitor question...easy one
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 7th April 2003, 09:44 PM #1 Guiness   diyAudio Member     Join Date: Dec 2002 Location: USA Capacitor question...easy one I think I am losing my memory in my old age. I cannot remember if you parallel 2 capacitors the voltage doubles with the capacitance? For example, if I parallel to 36,000uf 40V caps, do I get 72,000uf 80V? What do you get if not. Thanks for the help, need to give the brain a kick start this moring Guiness
fdegrove
diyAudio Senior Member

Join Date: Aug 2002
Location: Belgium
CAPS.

Hi,

A Guiness too many, huh?

Quote:
 I cannot remember if you parallel 2 capacitors the voltage doubles with the capacitance?
N caps in // gives you n times the capacitance at equal voltage,so in your example that would 72,000uF/40V

Two caps in series: half the total capacitance but twice the voltage rating.
Using the same caps that would give you 36,000uF/80V.
Also you better use an equalising network to spread the voltage over the caps so each one only see its' own max. voltage rating.

Hope this helps,
__________________
Frank

Christer
diyAudio Member

Join Date: Sep 2002
Location: Sweden
Re: Capacitor question...easy one

Quote:
 Originally posted by Guiness I think I am losing my memory in my old age. I cannot remember if you parallel 2 capacitors the voltage doubles with the capacitance? For example, if I parallel to 36,000uf 40V caps, do I get 72,000uf 80V? What do you get if not. Thanks for the help, need to give the brain a kick start this moring Guiness
No, you still get 40V. You do get 72000uF though. The voltage
rating is the max voltage the capacitors can take. When in
parallel they both "see" the same voltage as one capacitor
alone would.

In theory, connecting them in series would give you a capacitor
with double voltage rating and half capacitance. In practice it is
not safe to do so without adding resistors to make sure the
voltage is divided equally between the capacitors.

 7th April 2003, 09:55 PM #4 Guiness   diyAudio Member     Join Date: Dec 2002 Location: USA Thanks... I needed that! Guiness
 7th April 2003, 09:57 PM #5 Christer   diyAudio Member   Join Date: Sep 2002 Location: Sweden You beat me to it Frank. It does seems though that we agree on something for once.
fdegrove
diyAudio Senior Member

Join Date: Aug 2002
Location: Belgium
CAPS.

Hi,

Quote:
 You beat me to it Frank. It does seems though that we agree
LOL.

Christer, in all earnest, I think we agree on a lot more than what you seem to think.

Cheers,
__________________
Frank

Christer
diyAudio Member

Join Date: Sep 2002
Location: Sweden
Re: CAPS.

Quote:
 Originally posted by fdegrove Hi, LOL. Christer, in all earnest, I think we agree on a lot more than what you seem to think. Cheers,
I agree to that too.

I guess it is easier to remember disagreements, since they are
more interesting than agreements.

 7th April 2003, 10:14 PM #8 fdegrove   diyAudio Senior Member     Join Date: Aug 2002 Location: Belgium I ONLY REMEMBER THE SUNNY DAYS. __________________ Frank

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