Supplements and Herbs

Supplements and Herbs


Female Regulator

Question: Why does is my 7805 5V voltage regulator "overheating?"? I have a 7805 5V voltage regulator soldered to a female USB port and a 9V battery pack. The soldering is all fine, I've checked it many times. When I connect a 9V battery to the battery pack, the voltage output is 5V (according to my digital multimeter). However, within a couple seconds, the voltage regulator becomes incredibly hot. Is this normal, or will it damage the voltage regulator? If not, how should I fix it?

Answer: I depends how much current your circuit is drawing. Let's say it is 500 mA, then the voltage regulator is absorbing (9-5) x 0.5 = 2 W and will get hot, especially if you don't use a heat sink. Measure the current that your circuit is drawing and once you decide that it's normal and there is no short, simply mount a heat sink. The voltage regulator will still absorb the same wattage but now the arrangement has a lower thermal resistance to ambient air will not get quite as hot, thereby extending the life of your voltage regulator.

 


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