>From: Olin Lathrop <olin_piclist@EMBEDINC.COM>
>Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>To: PICLIST@MITVMA.MIT.EDU
>Subject: Re: [PIC]: Newbie Queston: Electrical protection for PICs
>Date: Tue, 23 Sep 2003 10:03:54 -0400
>
>Fuses are for preventing property damage and injury in case of part
>failure or abuse.  They can also be appropriate to protect expensive or
>difficult to replace components, but they have their own cost too.  The
>economics just don't make sense for protecting PICs with fuses, especially
>since a properly functioning PIC can't draw more than the rated current if
>the other min/max parameters are adhered to.
>
>
In designs built for students I always protect with a diode and a resettable
fuse. Also I beef up the voltage regulator( 7805 vs 78L05 ). Haven't lost a
chip yet( real hard to do ) but most importantly I haven't melted the traces
of the board either ( real easy to do ). No fried components which is easy
to do also.
Wallly Barnacle
>*****************************************************************
>Embed Inc, embedded system specialists in Littleton Massachusetts
>(978) 742-9014, http://www.embedinc.com
>
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