Cathode Bypass Cap questions
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 15th September 2005, 08:46 AM #1 dsavitsk   diyAudio Member     Join Date: Jan 2005 Location: Hartford Cathode Bypass Cap questions 2 quick cathode bypass cap questions: 1. is the voltage seen by the cathode bypass cap the same as the voltage dropped across the resistor? 2. to figure out the value of the cap when the plate is loaded with a CCS, do I use C = 1/(2 * pi * Hz * R) where R is simply the value of the biasing resistor -- essentially the plate load resistor is infinite due to the CCS? __________________ http://www.ecpaudio.com :: http://diy.ecpaudio.com
ilimzn
diyAudio Member

Join Date: Feb 2005
Location: Zagreb
Re: Cathode Bypass Cap questions

Quote:
 Originally posted by dsavitsk 2 quick cathode bypass cap questions: 1. is the voltage seen by the cathode bypass cap the same as the voltage dropped across the resistor?
This is a redundant question with an obvious answer - of course the voltage is the same since they are connected between the same two points!

Quote:
 2. to figure out the value of the cap when the plate is loaded with a CCS, do I use C = 1/(2 * pi * Hz * R) where R is simply the value of the biasing resistor -- essentially the plate load resistor is infinite due to the CCS?
Yes, but that is not counting the load for that stage (it's impedance is effectively in parallel with the anode load, the anode load in this case being 'infinite', the effective anode load for AC is the load impedance)

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