Calculation of HPF due to output capacitor, with source connected to load?

wwenze · 27th February 2010, 03:51 PM

With the load connected to the source it becomes like this:

How to calculate the cut-off frequency in this case? I'm guessing that this would result in a higher cut-off than with only 1 cap and 1 resistor.

wwenze · 28th February 2010, 04:12 AM

Hmm no replies?

Well I did some spices and what I saw - that value of C2 didn't have any effect on the filter. Though thinking about it makes perfect sense as current into the load is negligible vs current through R1 and R2.

Hmm... so no point for huge input capacitors?

27th February 2010, 03:51 PM	#1
wwenze diyAudio Member Join Date: Mar 2008	Calculation of HPF due to output capacitor, with source connected to load? With the load connected to the source it becomes like this: How to calculate the cut-off frequency in this case? I'm guessing that this would result in a higher cut-off than with only 1 cap and 1 resistor.

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28th February 2010, 04:12 AM	#2
wwenze diyAudio Member Join Date: Mar 2008	Hmm no replies? Well I did some spices and what I saw - that value of C2 didn't have any effect on the filter. Though thinking about it makes perfect sense as current into the load is negligible vs current through R1 and R2. Hmm... so no point for huge input capacitors?