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Regulator for radio controlled model question

Discussion in 'Electronic Basics' started by Tristar500, Jul 30, 2005.

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  1. Tristar500

    Tristar500 Guest

    I've got a question about the Adjustable-Voltage Regulator LM317T or
    similar.

    I'm looking to build a small simple lightweight BEC (battery
    elimination circuit)

    I understand there are some advantages/disadvantages to using linear
    regulators such as this as opposed to a switching power supply. The
    switching power supply can cause RF noise but are generally more
    efficient where as the liner don't cause any RF noise but can be
    inefficient and create a lot of heat.

    My question, If I'm using a LM317T or similar and am regulating the
    voltage over a small range, lets say 9VDC volts down to 6VDC will the
    efficiency be better with less heat if I was instead regulating the
    range over a much broader spectrum say from 24VDC down to 6VDC?

    I'd also assume that the heat and inefficiency goes up with the
    current draw?

    I suspect this to be true but I'm sure there are those of you out
    there who would know for sure.

    I'm looking for an output voltage of 4.5 to 6 VDC with a couple of
    amps.

    Thanks, Lawrence
     
  2. Dan Hollands

    Dan Hollands Guest

    Power is V x I

    With a linear regulator the regulator acts like an adjustable resistor to
    drop the unwanted voltage

    if you go from 9V to 6V at 2A then the wasted power is 3V x 2A = 6Watts

    if you go from 24V to 6V at 2A then the wasted power is 18V x 2A = 36Watts

    A switching regulator gets rid of the extra voltage in a different way and
    is therefore more efficient. It would probably be easier to design a 24 to
    6V switching regulator than a 9 to 6V switching regulator but the design of
    a reliable efficient switching regulator is not for the beginner.

    Dan

    --

    Dan Hollands
    1120 S Creek Dr
    Webster NY 14580
    585-872-2606

    www.QuickScoreRace.com
     
  3. quietguy

    quietguy Guest

    Have you had a look at the sites which have lots of circuits for RC
    models? If not do a google search and you will be pleased - or make a
    good start with...

    http://www.speedy-bl.com/index.htm

    David
     
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