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• 22:12, 30 May 2010 LawrenceChen talk contribs uploaded a new version of File:30HzRC4-7.jpg (Oscilloscope reading of the sinusoidal analog output with a sine frequency of 30Hz, a resistor of 47 kOhms, and a capacitor of 0.1 microFarads.)
• 22:05, 30 May 2010 LawrenceChen talk contribs uploaded File:30HzRC4-7.jpg (Oscilloscope reading of the sinusoidal analog output with a sine frequency of 25Hz, a resistor of 47 kOhms, and a capacitor of 0.1 microFarads.)