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Transcript
Chapter 9: Op Amp Building Blocks · Page 331 Buffer Test Measurements Figure 9-8 shows the RC DAC output on the lower, red CH2 trace and the voltage follower’s copy of that signal on the upper, blue CH1 trace. Note that the sine waves are the same amplitude and phase. This indicates that the op amp’s output is “following” the DAC voltage applied to its non-inverting input, even with the LED current load. Adjust your Oscilloscope’s Horizontal, Vertical and Trigger settings as to match Figure 9-8. Verify that the DAC’s sine wave is identical to the buffer output’s copy of it. Verify that the LED gets brighter and then dimmer at roughly once per second. Figure 9-8: Buffer Output = DAC Output
