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Old 27th March 2010, 12:05 PM   #1
smithie is offline smithie  United Kingdom
diyAudio Member
Join Date: Jan 2005
Location: cornwall
Default series capacitor values..

can someone tell me what the total value of these caps in series would add up to as i dont know the formular.
at presant i have two 47pf in series and that equals 23.5pf,so i understand that bit,but ive now added another 47pf in series so am unsure what total value i have now?
im also thinking of adding 4 47pf in series so any ideas what that total value will be?
im just using the parts i have laying around and experimenting with a feedback circuit on my amp,i just need to know these values to give me a idea what values to order when the time comes for decent stuff.
any help much appricated.
all the best
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Old 27th March 2010, 12:13 PM   #2
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Join Date: Sep 2003
Location: Midland, Michigan
47pf divided by three is 15.67p.
47pf divided by four is 11.75pf.
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Old 27th March 2010, 12:19 PM   #3
diyAudio Member
Join Date: Apr 2004
Location: Monroe Township, NJ
Equal value caps. in series is easy. Just divide by the number of parts.

Caps. in series follow a reciprocal Law, just like resistors in parallel.

1/Cnet = 1/C1 + 1/C2 + 1/C3 + ... + 1/Cn
Eli D.
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Old 27th March 2010, 12:54 PM   #4
smithie is offline smithie  United Kingdom
diyAudio Member
Join Date: Jan 2005
Location: cornwall
hi guys
thank you so much,youve been a great help and ive now made a note of the formular.
once again much appricated
all the best
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