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Capacitive load testing
Capacitive load testing
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Old 23rd August 2011, 05:31 PM   #1
Neutrality is offline Neutrality  Denmark
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Default Capacitive load testing

This might be an extremely stupid question, but when testing amplifier stability with capacitive loads, you should look at the signal BEFORE the output inductor? The output inductor is afterall there to shield the amp from whatever capacitive load it has to drive.

My own guess is yes, look at it before the inductor, but simulation amplifiers is a learning process and better to be safe than sorry.

Last edited by Neutrality; 23rd August 2011 at 05:33 PM.
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Old 23rd August 2011, 07:12 PM   #2
Neutrality is offline Neutrality  Denmark
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Anyone?
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Old 23rd August 2011, 07:19 PM   #3
AndrewT is offline AndrewT  Scotland
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As far as I have learned, the test point is before the L//R at the output.
Cherry even moves the test point down past the first R of the C+R Zobel, this is where he suggests one should tap off the NFB signal for more attenuation of interference coming in from the speaker leads.
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Old 23rd August 2011, 07:23 PM   #4
Neutrality is offline Neutrality  Denmark
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Quote:
Originally Posted by AndrewT View Post
As far as I have learned, the test point is before the L//R at the output.
Cherry even moves the test point down past the first R of the C+R Zobel, this is where he suggests one should tap off the NFB signal for more attenuation of interference coming in from the speaker leads.
Ok, thanks. Also made the most sense.
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