Square waveform output at Photodiode

  1. chetan.bele
    Hi All,

    I have a 2V p-p square wave signal of 500µs. This signal I am giving to LED and measuring the waveform across resistor connceted in series with LED. It gives me square waveform. Now I have one camera which is taking this flashing light as a frame and this camera signal I am displaying on the display. I have designed one Photodiode circuit ( photodiode and 100K resistor in series ) having a suppy of 5V, So when flash light of LED taken by camera is dispaying on display, Photodiode is getting activated. But the problem is I am not able to see the variation in waveform as when it is activating, output is directly 5V DC. I need to see the variation in square waveform. Want to calcualte delay between camera input and output. Please help me out for getting square wave across photodiode. Let me know where i am going wrong.

    Thanks in advance.
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