This is a 555 Timer circuit used to control a servo motor. Adjusting the potentiomer should change the duty cycle of the control signal sent to the servo.
To adjust the position of the potentiometer, tap/click on the % parameter and use the slider to adjust the value.
Source: The Robot Builder's Bonanza: http://www.robotoid.com/appnotes/circuits-servo-control-with-555-timer.html
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