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Simple Circuit Problem


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I have some problem for my circuit below. Suppose at point A, I will get a waveform as shown in the graph below. But, instead of getting the desire results, I got a sine wave ( Vp-p = 3.XX volts ). Actually I manage to get the desire results at the beginning of my test - but after a whille the waveform change into a sinewave with smaller amplitude and remain!. What's wrong with my circuit? Do I need to make ay changes?

post-2221-14279141691175_thumb.jpg

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