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I'm not exactly positive, but here it goes. The ratio of the voltage drops is equal to the ratio of the 2 loads (resistor and servo). You want a maximum voltage of 6 volts on the servo. So the voltage drop on the resistor is 1.2 V. The maximum resistance (935 ohms) of the servo is the minimum current (7.7mA) Keeping the ratios the same, the circuit would need 187 ohms of resistance when it is not moving. However, the circuit would only need 8 ohms when it's moving... My suggestion is to purchase a 6V regulator from digikey.com It'll cost around $1
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