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Reference.org
Battery eliminator circuit
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<p>In battery-powered equipment, a battery eliminator circuit (BEC) is an electronic <a href="/facts/Voltage_regulator/RWQATaje">voltage regulator</a> used to power a subsystem at a different voltage without the need for a supplemental <a href="/facts/Battery_(electricity)/bqEpm4ue">battery</a>. BECs are commonly used in <a href="/facts/Radio-controlled_model/wPPuCk5b">radio-controlled models</a>, which need separate voltages to power the motor and the RC equipment. </p>