Re: DC Voltages

From:         rrea@caedm.et.byu.edu (Richard N. Rea)
Organization: Brigham Young University
Date:         01 Jun 96 16:32:39 
References:   1 2
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In article <airliners.1996.725@ohare.Chicago.COM> Konrad Kelley <wingnut@mail.utexas.edu> writes:

>        If you are not going to draw a lot of amps (i.e. jumpstarting
>an engine, running flap motors) , basically all that is needed is an
>appropriately sized resistor to drop 16V out before you supply
>whatever is is you're running. The more amps , the higher the wattage
>rating of the resistor needed to dissapate the excess energy without
>overheating and burning up.

You DON'T want to drop voltage in this manner!  Either a linear voltage
regulator or a switching regulator should be used to provide a correctly
regulated voltage at the desired current.  The switching method is more
efficient but produces more noise, so it must be filtered appropriately.

Follow the first suggestion and visit your avionics shop to see what they have
that is already STC'd for aviation use.  Don't fool with the aircraft
electronics if you aren't certified to do so!

Richard Rea    <rrea@bones.et.byu.edu>