What type of timer relay do i need?

Discussion in 'The Projects Forum' started by jlholmes, Feb 23, 2009.

  1. jlholmes

    Thread Starter New Member

    Jan 30, 2009
    4
    0
    I need a timer relay for a project that I am working on. The relay has to be cheap as possible. I need a timer relay i can hook a 9 volt battery up to and set the timer on the relay and when the time is up 7-9 volts of current is released to the out put. I prefer the relay to be minutes or hour intervals. i think i get the jist of how relays work but which one will hook up to a 9v battery and release 7-9 volts when the timer goes off? is this possible or am i way off base? Any help or suggestions would be appreciated. Someone point me in the right dirrection.

    will this work
    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=350167531023&Category=4661

    Or how bout this
    http://cgi.ebay.com/DEI-528T-12-VOL...286.c0.m14&_trkparms=66:2|65:15|39:1|240:1318

    please help
     
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,173
    397
    Ebay choices do not look promising, not enough inf. Try a one minute period oscillator, 8 bit counter, couple of 8 input AND getes low current SCR , relay and plug board.
     
  3. jlholmes

    Thread Starter New Member

    Jan 30, 2009
    4
    0
    could u be more specific?
     
  4. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,173
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    If you had a schematic for a timer, could you build it?
    Need more information on timing requirement, one to ten minutes in one minute incriments ? ;or continuously variable ? How long ?
    Can you decode an 8 bit binary counter?
     
  5. jlholmes

    Thread Starter New Member

    Jan 30, 2009
    4
    0
    well i sappose i could build it from schematics, i can soilder or i could get a plug board. Isnt there just a timed relay I could buy that i could hook a 9v up to and when the time is up 9vs or a little less is discharged. cheap and easy. 8 bit binary? no afraid not...I want second intervals up to an hour or more....no less then thirty seconds.
     
  6. jlholmes

    Thread Starter New Member

    Jan 30, 2009
    4
    0
    is there a kit i could buy with a plug board and all the things i would need to make the timer
     
  7. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    I do not know of such a timer or kit; cheap, about $ 5 US max in parts. Second intervals in 2 hrs. = 7200, big order. After you finish ckt. you will be an expert at programming time on a pair of DIP Switches, esp if interval can be stretched to 10-60 sec.
     
  8. italo

    New Member

    Nov 20, 2005
    205
    1
    When it comes to long timing lm555 is particularly suited for it.Time from microsec to-hours is possible. And since he can drive 200ma means a relay can interface directly or supply 200 ma to your circuit as a switch but only for 200ma.
     
  9. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    If using a 555 for long (hours) periods, a low-leakage capacitor is required.
     
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