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Calculate PSU output impedance?
Calculate PSU output impedance?
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Old 19th May 2007, 02:38 PM   #1
jayme is offline jayme  United States
diyAudio Member
Join Date: Sep 2005
Default Calculate PSU output impedance?

How do I calculate the output impedance of my PSU?

I have a 5AR4 into a CLCLC filter.

If I model it in PSUD, can I determine the output impedance by varying the current draw by 1mA, and note the step difference in voltage that results?

By that method, I currently get an impedance of around 2500 ohms.

By varying the capacitance in each of the stages, I can certainly reduce the voltage drop change. Is this the best way to lower the impedance?

P.S. I just added some series resistance to the PSU to reduce the Q factor and stop some low frequency motorboating. The motorboating is gone, but it doesn't sound as dynamic anymore....
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Old 19th May 2007, 07:27 PM   #2
yagas is offline yagas  Greece
diyAudio Member
Join Date: Sep 2004
Location: Athens
LC filter's output impedance is high. I think that you're ready to talk about regulation !!
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