- #1
Kururunfagoju
- 4
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Hi there,
I'm measuring the voltage on the output of an amplified photodiode circuit that is capturing light emitted by an Liquid Crystal Display (LCD) projector and there is a periodic voltage drop which I don't know the reason. The projector is projecting an all-white image.
I've been reading that LCD displays must be AC powered because if they are powered using DC there will be electrochemical reactions that will make them to fail.
I can see the AC modulation on the signal and that is ok for me. What I cannot explain is the origin of the periodic voltage drop/ripple.
As an attachment you can see the plot of this signal.
Any help would be greatly appreciated.
Thank you very much in advance!
I'm measuring the voltage on the output of an amplified photodiode circuit that is capturing light emitted by an Liquid Crystal Display (LCD) projector and there is a periodic voltage drop which I don't know the reason. The projector is projecting an all-white image.
I've been reading that LCD displays must be AC powered because if they are powered using DC there will be electrochemical reactions that will make them to fail.
I can see the AC modulation on the signal and that is ok for me. What I cannot explain is the origin of the periodic voltage drop/ripple.
As an attachment you can see the plot of this signal.
Any help would be greatly appreciated.
Thank you very much in advance!