Sensor failure, strange problem

Discussion in 'General Electronics Chat' started by jkj123, Dec 10, 2008.

  1. jkj123

    Thread Starter Member

    Nov 5, 2008
    22
    0
    Hi,
    I have a microcontroller circuit and I use 5V regulator (RECOM) and another 3.3v regulator (LM1085, 3.3) for a finger print sensor.
    In some unknown situation, the sensor gets destroyed.

    I am using a good SMPS for 230VAC to 12VDC, which goes to RECOM 12V to 5V and then 5V to 3.3V.

    Is this because of the capacitor(10uF/25) at the output of 3.3v regulator which has 25V rating? I am thinking in that way because the sensor is so sensitive.
    Or is it because of any negative current ?

    Is there any solution to avoid this problem using any current/ or voltage limiter?

    Thanks n rgrds
    Jaison
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    I think we will need a schematic of the circuit to get to the bottom of your problem in a timely manner.

    hgmjr
     
  3. FBorges22

    Active Member

    Sep 11, 2008
    104
    0
    Do you have the part number of the finger print sensor that you are using?
     
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