Servo motor tester

+4,8V/10mA This circuit is of interest to two categories of readers; first, model air- craft/boat/train enthusiasts object- ing to having to leave their radio control transmitter switched on for extended periods in order that a servo-motor and associated mechan- ical parts can be made to function as desired; secondly, constructors of computer-controlled robots incor- porating servo-motors. The latter field of interest is a typical combi- nation of mechanics and electronics plus software, and it is sometimes urgently required to be able to keep them apart as the specific parts of the robot have been prepared for testing, which, arguably, should be possible to do without having to write special programs to this end on the computer. The proposed servo-motor test unit is, as can be seen from the circuit diagram, a downright simple design based on the use of Type 555 or 7555 timer chips connected in a cascade arrangement which can be ex- panded further to drive more than two servos at ...