Chapter 13, Problem 9RQ

As part of an electronic music synthesizer you need to build a gizmo to convert a linear voltage to an exponentially related current. Your build three prototype circuits and make several measurements of voltage and current in each. The collected data are given in the following table.

1. a. Show the resulting data and trendline, with equation and R² value, on the appropriate graph type (xy scatter, semilog, or log–log) to make the data appear linear.
2. b. Which of the three circuits comes the closest to doubling the current for an increase of 1 volt? Note that this doubling is independent of the actual values of voltage, Example. If the current was 0.3 ma at 2.7 volts, it should be 0.6 mA at 3.7 volts, 1.2 mA at 4.7 volts, 2.4 mA at 5.7 volts, etc.
3. c. Calculated the value that should appear in the exponent if the current is to double with each increase of 1 volt. Note that you should perform this calculation without referring to the data, the plots, or the trendline equations. This is a purely theoretical calculation.