3 Amp Universal Battery Elimination Circuit (UBEC)

Using this UBEC is a safer way to go on large models for the following reasons:

1. Most built-in BEC circuits are 1 to 2 amp 'linear mode' circuits which are only useful for 2 or possibly 3 standard size servos when using a 3 cell Lipo battery. If you use more servos, or a higher voltage battery pack, you will almost certainly overload the BEC, causing a crashed model.

2. In an ESC with a built-in BEC, excessive heat generated in the ESC by the current draw of the motor and/or BEC can cause total loss of power to the receiver/servos, resulting in a crashed model. The chance of total loss of power is greatly reduced when a separate receiver battery pack or UBEC is used. If the ESC overheats and shuts down (no power to the motor), you will still have power to the receiver/servos, and will be able to maintain control of the model.

Connecting a UBEC:
The red (+) and black (-) power input wires of the UBEC are connected directly to the main battery pack of an electric model, the same as the ESC. In fact, the power input wires of the UBEC are often spliced into the power input wires of the ESC, so that the UBEC and ESC power on at exactly the same moment. The power output wires of the UBEC have a receiver connector on them, and this is usually plugged into any open channel of the receiver.

Special note:
If the ESC being used has a built in BEC, that BEC must be disabled when using a UBEC, as you should have only one power source providing power to the receiver. To disable the BEC of an ESC, simply disconnect or cut the red wire on the receiver plug of the ESC.
If you are certain that your ESC does not have a built in BEC, then do not disconnect the red wire of the receiver plug of the ESC (if it has one). Most ESCs that do not have a built-in BEC say OPTO somewhere on the label.

3A UBEC Specifications:

Input Voltage: 5 to 21 volts (2-5 cell Lipo batteries)

Output Voltage: 5 volts

Output Current: 3 amps. Will power up to 6 standard size, medium torque (60 oz) servos, and up to 8 sub-micro servos.

Interference reduction: Ferrite ring on receiver wire

Regulator type: Switching

Power input connector: Red JST (female housing)

Receiver Connector: Universal 'S' type

Weight: 0.3 oz (9 grams)

Size: 1.4 x 0.63 x 0.4 inches

For use with 2.4 Ghz and 72 Mhz radio systems

Please visit the Electronic Speed Control Frequently Asked Questions for more information about UBECs and choosing the correct speed control for your model.