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Airtronics Voltage Regulator Heavy Duty 94151/152 Servos Some voltage regulators that are built into inexpensive electronic speed controls can not handle the high current-draw of high torque servos, such as the Airtronics 94151 and 94152 servos.
Use this heavy-duty voltage regulator between the servo and receiver. The loose red wire should be soldered to the red wire (+) on your battery.
It has the older-style black ATX plug.