The calculations shown are not correct. R2 is stated as 1/.7*10uF = 71kOhm, when this calculates to 143 kOhm. The next calculation left out the subtraction portion, and should calculate to 71 kOhm, not the 143 kOhm shown; in other words, the answers are reversed. This has significant bearing because the conclusion of using the variable resistor as R1 to increase the T-space is incorrect, as it would only increase T-mark. Are the first two equations crossed? If so this would largely resolve the calculation errors, and the conclusion about the potentiometer as R1 increasing T-space and reducing the duty cycle. |
