Servo Driver

  
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To hook up the three Pot connections you will firstly need to establish the tags and the positions that I refer to. If you take the pot and look at the back of it, then make sure that the tags are at the top of the pot, then; The only thing that will happen if you get them wrong is that the servo will not respond correctly to your commands and when you power
Servo Driver - schematic

it up it will wind all the way to one side and stay there. If this happens then reverse the connections to Pot A and C and all should be fine. Pot B is always the middle. To hook up the motor + and -, you simply need to look at the back of the servo motor and there will be a red dot on the positive side. Hook this to the Mot + and the other to the Mot -. Some servo`s have and additional capacitor across the terminals of the servo motor, you can remove this if you want, the circuit has a capacitor on the PCB to do the same job. Now check that you have not soldered over the tracks and that all components are in the correct spot. Also use a Multi-Meter set at a low Ohmage and test on the backside on the PCB to make sure nothing is shorted out. You can use the schematic as a guide to which parts of the circuit should be connected to which other parts. Remove all servo drive gears from the servo, making a note of how they came off and where they fit (take a photo if you have a digital camera). This should only leave the drive gear from the Servo Motor and the pot shaft left in the servo. Take a spare battery pack and through a connect it directly to the servo. You will need and adapter to do this, I just use short bits of left over wire from the resistors to make the bridge. Please make sure you have the polarity right i. e. ; Black servo wire to the negative side of the battery and the Positive Servo wire to the positive side...



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