# 12.6: Procedure


1. Assemble the circuit of Figure 12.5.1 . Note that the power supplies are only +/– 5 VDC, not the usual +/– 15 VDC.

2. For proper operation, it is very important that any DC input signals be nulled. Failure to do so will cause the control signal to “leak” into the output. To null the circuit, first tie the left end of the 33 k$$\Omega$$ resistor to ground. Also, tie $$V_{control}$$ to ground. Finally, adjust the potentiometer until $$V_{out}$$ is 0 VDC. The circuit is now nulled. Unhook the resistor and control points from ground in order to continue to the next step.

3. Set $$V_{control}$$ to –3 VDC. If a third output is not available on the DC power supply, the –3 VDC potential may be derived from the –5 VDC supply and appropriate divider resistors.

4. Set the main generator to a 100 kHz sine wave, 1 volt peak.

5. Apply the generator to the circuit input. Measure and record the output voltage in Table 12.7.1. Also, compute the resulting experimental voltage gain.

6. Repeat steps 3 through 5 for the remaining $$V_{control}$$ values in Table 12.7.1 .

7. Using the data from Table 12.7.1, plot the gain versus control voltage characteristic as Graph 1.

8. Set the second generator to a 1 kHz sine wave, 1 volt peak. Apply the second generator to the $$V_{control}$$ point.

9. Set the main generator to a 1 volt peak 100 kHz sine wave, and connect it to the circuit input.

10. Measure and record the output waveform as Graph 2.

11. Change the main generator to a 1 volt peak 100 kHz triangle wave and record the resulting output waveform as Graph 3.

This page titled 12.6: Procedure is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by James M. Fiore via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.