Servos are devices that can place an armature is a specific position. This circuit will produce pulses to control the position of a servo armature.
The circuit below produces pulses between 0.2ms to 11ms. This stretches beyond the range of most servos but will enable specific positoning to be achieved.
The useable range is 0.75ms to 2.25ms
Set the Range 2 - (31Hz-850Hz) with VR1 at near minimum, (anti-clockwise)
Set the polarity to negative and the duration to a minimum.
Set the Range jumper to 1 (0.2ms to 11ms)