7805 heating

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  1. - 7th February 2007, 17:46 #1
    sirvo's Avatar
    sirvo
    sirvo is offline Member
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    Default 7805 heating

    Hello..

    i developed an application (12f629) to turn on or off my car using the alarm control. To stabilize the voltage i've used the 7805 regulator. I've used 4 relays in this project. It is draining at most 250mA when the 4 relays are on. This situation of 250mA draining can occur for 40seconds and no more than that. Is it normal for the 7805 to get hot? Should I use a heat sink?

    ps.. i can let my finger on it when it's full loaded.

    thanks...

    Sylvio
    Last edited by sirvo; - 7th February 2007 at 17:51.
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