series capacitor values..

smithie · 27th March 2010, 12:05 PM

hi
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
smithie

Frank Berry · 27th March 2010, 12:13 PM

47pf divided by three is 15.67p.
47pf divided by four is 11.75pf.

Eli Duttman · 27th March 2010, 12:19 PM

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/C_net = 1/C₁ + 1/C₂ + 1/C₃ + ... + 1/C_n

smithie · 27th March 2010, 12:54 PM

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
smithie

27th March 2010, 12:05 PM	#1
smithie diyAudio Member Join Date: Jan 2005 Location: cornwall	series capacitor values.. hi 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 smithie

27th March 2010, 12:13 PM	#2
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	47pf divided by three is 15.67p. 47pf divided by four is 11.75pf. __________________ Frank

27th March 2010, 12:19 PM	#3
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, 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/C_net = 1/C₁ + 1/C₂ + 1/C₃ + ... + 1/C_n __________________ Eli D.

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27th March 2010, 12:54 PM	#4
smithie 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 smithie

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