Simple Help with Multimeter

Discussion in 'The Projects Forum' started by Chris15, May 10, 2009.

  1. Chris15

    Thread Starter Active Member

    Apr 15, 2009
    252
    0
    Hey
    I just bought a multimeter for a circuit i blew up, i am confused but please bear with me. i have a circuit for an electronic Safe ES20, the supply voltage id 6V from 4 AA bateries, i modified it with a mains plug also 6V but 300ma and thats what i think destroyed it, where do i start with the multimeter, what setting and what components do i put it on, the circuit has 3 silicon diodes, lots of resistors, no electrolytic capacitors, a 14 leg chip and a 8 pin chip (not a 555)

    Please help
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    I think you are talking about the sandleford safe eS20.
    http://www.fixya.com/tags/sandleford_safe_es20
    The components are probably proprietair (specialy made for sandleford).
    Finding data for them will be VERY difficult.

    Greetings,
    Bertus
     
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    You destroyed it because the wall adaptor you have is unregulated. This means that to output 6V the device must draw 300mA otherwise it will output a voltage higher than 6V (up to 8.5V). When powering electronic devices from wall adaptors take care of them to be regulated.
     
  4. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    On the up side you now own a multimeter. :)
     
  5. Chris15

    Thread Starter Active Member

    Apr 15, 2009
    252
    0
    Yeh but how do i fix the circuit? there is a component that is screwed so how do i find it, a diode a resistor?
     
  6. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    If you post the schematic we may be able to walk you through it.
     
  7. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    I'll bet that at least one of the IC's is a microcontroller, and by applying more than 6v to it, you've fried it.

    Even if you can read the numbers from the IC and order a new one, it won't come programmed.

    It's not likely that you'll be able to get the program code from the manufacturer.
     
  8. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    Oops, I just took a peek at the link he posted. I thought that this was a kit circuit. Guess not.
     
    Last edited: Jun 10, 2009
  9. Chris15

    Thread Starter Active Member

    Apr 15, 2009
    252
    0
    Ok thanks SgtWookie and everyone else ill just buy a new safe, but i have this lump of steel bolted to my desk with no curcuit just a key, is there any circuit i could build simply that would an electronic entry?

    Chris
     
Loading...