12v Timer Relay

Discussion in 'Electronics Resources' started by repobounty, Aug 12, 2007.

  1. repobounty

    Thread Starter New Member

    Aug 12, 2007
    3
    0
    Hello all

    Any one know the best way to do this.

    I need to be able to push a switch, and turn on a light for 3min and then have it turn off automaticly.

    It needs to fit within a 1 inch square and be water tight.

    Does anyone know any other way to do this?

    Robert
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Can you provide more information on the application of this pushbutton watertight light source?

    At what depth does this device need to operate?

    hgmjr
     
  3. mrmeval

    Distinguished Member

    Jun 30, 2006
    833
    2
  4. repobounty

    Thread Starter New Member

    Aug 12, 2007
    3
    0
    Well I am not sure what you need,

    I will be powering a 25 LEDs from a verysmall 12v battery [1/2 size of a AAA] it will use a tilt switch and when activated... the light will turn on for 3 min and then turn off automaticly... regardless if the switch is turned off or not.

    It will be in a wet area not submerged, it needs to fit into a 1" square or as small as poss. Solid State would be best i think if there is such a thing.

    Hope that is what yyou need
     
  5. spar59

    Active Member

    Aug 4, 2007
    51
    0
    A U6046 or U6047 8 pin dil IC designed for automotive applications such as heated screen timing can produce time delays of 3.7 sec to 20 hours, designed for 12v operation and can switch 300mA. Only problem may be the 1.3mA typical supply current if running from batteries.

    When switched on by an 'on' contact it will switch off by either an 'off' contact or when the time delay expires - needs 3 resistors + 2 capacitors so should be within your size constraints..

    Datasheet available at:-

    http://pdf1.alldatasheet.com/datasheet-pdf/view/90384/TEMIC/U6047B.html

    Steve.
     
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