The NF-SD1 module (Night Flight - Slow down) serves to limit the speed of movement of servo at response to a change of deviation. The unit is designed for aeromodellers for slow punishing out of landing gear and wing flaps. In ship modelling and models of military or construction machines, the unit can be used for slow, fluent positioning of gibs, special bodies, openning of bars and tops, slow starts and slowing down. With that kind of technique, you will appreciate long running times - they can be set in the range between 0,7 to 14,7 sec. - for run between the end positions.

The module reads information about the desired deviation of servo from the receiver and sends it to output. In the stable state, the values on input and output are equal. When a fast chage on input occurs, the output starts changing slownly so that the set maximun speed is not exceeded. The maximun speed can be used won a trimmer with a small screwdriver. With switch-controlled channels it makes possible a fluent, linear change of deviation on a model.