Digital Servo Amplifier

This is now at the prototype stage - i.e. stick it in a model and use it! I have wanted to do do this project for several years. Now there is a PIC microcontroller with a 10bit ADC with adjustable min/max references to measure the feedback pot position to better than 0.1% accuracy and EEPROM memory to store a failsafe position even when power is removed. The servo started as a JR 591 standard size ballrace servo. The digital servo amp PCB is 17mm x 19mm.

Features: Precise and rapid control. Position measured and motor driven 1000 times/second. No overshoot - algorithm compensates for motor inertia. High speed from MOSFET motor drivers. Tight control - deadband less than gearbox slack. Accurate control to better than 0.1% of pot. Ignores pulses outside normal 1-2ms range. Will not drive arm outside normal span of movement. Servo span adjustable 70 - 90° via pot. Bad pulses (outside 0.9 -2.1ms) trigger failsafe. Absence of input pulses triggers failsafe. Failsafe position securely programmed via simple special programmer. A 16Mhz process control computer on a postage stamp!

Commercial enquiries welcome

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