Let's Make Robots!

Servo wobble?

I used the circuit from this website http://www.hvlabs.com/555servo.html to control dc servo motor. 

However, i changed R1 to 1k, potentiometer to 10k, R2 to 68k and C3 to 470nF so that the servo able to turn to about 180 degree.

From this formula F = 1.44 / (R1+R2)(C3), i calculated the output frequency is about 44.4Hz.

Servo motor

Is it possible to modify the circuit from this website http://www.hvlabs.com/555servo.html to allow the servo to turn to 180 degree?

Servo motor

How to control a servo motor (2) by just twisting or turning the other servo motor (1) or potentiometer using hand?

The servo motor 2 will follow the movements of the servo motor 1 or the potentiometer.

Not necessary to use a servo motor for the servo motor 1, just any solution that would perform what is shown in this video (http://www.youtube.com/watch?v=zZwnyZPkylk&feature=related).

Thanks.