Unidentified Problem !!!!

Discussion in 'General Electronics Chat' started by lesin akbar, Jan 9, 2008.

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  1. lesin akbar

    Thread Starter Active Member

    Dec 16, 2007
    I've built a circuit containing AT89c51 along with 7 relays( for AC switching), relay is driven by ULN2003(12v). and the microcontroller is serially interfaced with the system. Now evrything works smoothly for "sometime". After that what happens no idea. If the ckt is restarted it works again. What could be the problem ? Ive noticed this thing in two other circuit also , that is when AC controlling comes, microcontroller goes MAD. Could it be solved by some sought of sheilding and all. In the earlier projects when this thing happend we completly isolated (perfect isolation) the motors and the ckt, all went in vain. Any one can please guide me ???????????
  2. Dave

    Retired Moderator

    Nov 17, 2003
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