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'[EE]: 2-tran SMPS 5v reg now 90% efficicient!'
2002\09\24@011120 by James Newton, webhost

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source= http://www.piclist.com/postbot.asp?id=piclist\2002\09\23\220545a

Roman said: "Re your over voltage question and possibility of a
shorted switching transistor, I would just use a small
fusible resistor 0.33 ohms etc in series with the
input voltage. This will save your $100 equipment! :o)"

My dad always used to put a light bulb in series with the supply to protect
against shorts. Very low resistance when cold, but that increases as it
heats and it drops most of the voltage when there is a short, etc... If you
package it right, it can act as an overtemp sensor AND an overload
indicator.


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