Timer circuit

Discussion in 'General Electronics Chat' started by Iamglozekmiles, Aug 5, 2015.

  1. Iamglozekmiles

    Thread Starter New Member

    Aug 3, 2015
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    I want to build a circuit that would send signal at the following time intervals, 8:00A.M, 1:00P.M, 2:00P.M, and 5:00P.M only to switct a 12VD.C relay. Please I need help with the circuit diagram.
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    That is going to be hard to accomplish without using a clock as a starting point. This is even more true if the times to tuen on and off may change.

    One of the easiest ways to build a custom clock (with a display and some buttons for setings) is to start with some sort of micro controller (or small computer). Is this something you would feel you could do?

    The only other alternatice I see is connecting together several timer clocks where each one is set for what time you want it on or off.
     
  3. Iamglozekmiles

    Thread Starter New Member

    Aug 3, 2015
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    do you have a working circuit
     
  4. kubeek

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  5. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Just get one of these. About $10 at harbor freight
     
  6. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    Is 12 VDC the requirement for the relay coil, or is that the circuit voltage you want to switch through the contacts?

    ak
     
  7. ErnieM

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    Apr 24, 2011
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    Do they have a Harbor Freight in Nigeria?
     
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  8. ian field

    Distinguished Member

    Oct 27, 2012
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    They might have a growing pile of discarded old VCRs there that a timer could be salvaged from.
     
  9. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    probably not, but since that thing is made in China, it might be marketed there. It has eight different programs, each with its own on time and off time, any day of the week. These are really handy. It has a replaceable battery to preserve the timing and program even if the AC power goes off.
     
  10. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    You can also get a sprinkler system timer. Timer, with daily repeat and high current drive for valve activation.
     
  11. Lestraveled

    Well-Known Member

    May 19, 2014
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    +1 on the sprinkler timer.
     
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