555 Timer Servo Controller with 2 trimable preset positions

This is a 555 Timer circuit used to control a servo motor. Adjusting the potentiometers should change the duty cycle of the control signal sent to the servo. The circuit has been modified to include a switchable control to allow for 2 trimable preset positions. In this circuit, the switched positions are also controlled by a 555 monostable circuit. The time can also be adjusted with the trimmer. 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