50,000 volt etch-a-sketch!

Step 8 Servo hacking.

   Ok, For those of you that already know how to make a servo run continuously, ignore this step, for those that dont, here is a short tutorial.

 Essentually, a servo is just a motor in a gear box, with a circuit that runs off of a signal from a servo controler, and limits the servo's motion, to mod our servo's were just gonna bypass the driver circuit, and go directly to the motor.

  First thing you will need is some small screwdrivers, and a soldering iron.

 First thing we need to do is remove the back from the servo case, there will be 4 small screws in the back, probably phillips head, just take them out. 

You can see 3 wires attached to the circuit board inside the servo case.
using your soldering iron, heat up the connections and pull the 3 wires off of the board. Next, on the top of the circuit board, you will see a variable resistor, it will be attached with 3 leads, simply cut it off of the board, and put it aside, you might find a use for it later. (please look at the pictures if you have any questions) Next, you will need to solder the red and black wires onto the motor, it really doesnt matter what lead u solder to what side, as long as u make both of the servos the same.

 All done with the soldering. Now onto the hardware modding part.
 
now that were done with the wires, we need to take the top off of the servo case, to get to the gears.
 
  Remove the servo head, and the top of the case will lift off, were after the large gear inside, it will look something like the gear highlighted in the picture. There is a little bit of cutting to do here, you can see the small rectangle with  holes in it, highlighted in the picture below, we need to remove it, I used a dremel tool, seemed like the best way to do it.