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Calculate -3dB point

202.4.201.57

Posted on July 3, 2012 at 05:48:03
Eric Chan
Audiophile

Posts: 52
Joined: October 31, 2001
Wold someone please let me know the -3dB response in LF when

ecc99, coupling cap is 0.22uF loading 66K Z of next stage.

 

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11Hz, posted on July 3, 2012 at 07:47:47
Tre'
Industry Professional

Posts: 9155
Location: So. Cal.
Joined: February 9, 2002
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Have Fun and Enjoy the Music
"Still Working the Problem"

 

RE: Calculate -3dB point, posted on July 3, 2012 at 08:01:22
Here is an RC calculator.

This shows 11hz as the -3db point. Phase gets lagged 90 degrees in the voltage going through the cap. Phase will be disrupted 10x above the knee. So in this case, phase will be disrupted to 110 hz. You should shoot for 3hz or less to avoid phase issues. The 3hz point requires a 0.8uf cap into your 66K load.

 

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