110V timer

Discussion in 'Electronic Design' started by Rob, May 27, 2007.

  1. Rob

    Rob Guest

    I bought a 110v rotary timer and wired it to an outlet. Now I can turn the
    dial and it will turn off the outlet in 60 minutes.

    The timer cost $21, that seems pretty high. I have seen cheap timer IC, but
    they take low voltage. Does anyone know where I could buy the necesarry
    parts to do the same thing for a lot less. I need to make quite a few of
    these.

    Thanks,
    Rob
     
    Rob, May 27, 2007
    #1
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  2. Rob

    D from BC Guest

    On Sat, 26 May 2007 22:02:19 -0400, "Rob" <r> wrote:

    >I bought a 110v rotary timer and wired it to an outlet. Now I can turn the
    >dial and it will turn off the outlet in 60 minutes.
    >
    >The timer cost $21, that seems pretty high. I have seen cheap timer IC, but
    >they take low voltage. Does anyone know where I could buy the necesarry
    >parts to do the same thing for a lot less. I need to make quite a few of
    >these.
    >
    >Thanks,
    >Rob



    Just AC off in 60 minutes...??

    I'll guess..
    Triac + RC cct..

    D from BC
     
    D from BC, May 27, 2007
    #2
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  3. Rob

    Jasen Guest

    On 2007-05-27, Rob <r> wrote:
    > I bought a 110v rotary timer and wired it to an outlet. Now I can turn the
    > dial and it will turn off the outlet in 60 minutes.
    >
    > The timer cost $21, that seems pretty high. I have seen cheap timer IC, but
    > they take low voltage. Does anyone know where I could buy the necesarry
    > parts to do the same thing for a lot less. I need to make quite a few of
    > these.


    that price is high, I bet you can get 24 hour outlet timers for automatic
    start/stop of appliances for less than $5, (I've seen them for NZ$8)
    possibly the easiest way to build your 60 minute timers may be to grab a
    bunch of those (as they already have the switch etc... in them) and modify them.

    Bye.
    Jasen
     
    Jasen, May 27, 2007
    #3
  4. "Jasen" <> wrote in message
    news:f3ba82$ii2$-a-geek.org...
    > On 2007-05-27, Rob <r> wrote:
    >> I bought a 110v rotary timer and wired it to an outlet. Now I can turn
    >> the
    >> dial and it will turn off the outlet in 60 minutes.
    >>
    >> The timer cost $21, that seems pretty high. I have seen cheap timer IC,
    >> but
    >> they take low voltage. Does anyone know where I could buy the necesarry
    >> parts to do the same thing for a lot less. I need to make quite a few
    >> of
    >> these.

    >
    > that price is high, I bet you can get 24 hour outlet timers for automatic
    > start/stop of appliances for less than $5, (I've seen them for NZ$8)
    > possibly the easiest way to build your 60 minute timers may be to grab a
    > bunch of those (as they already have the switch etc... in them) and
    > modify them.
    >


    Such timers are often available surplus at places like www.mpja.com,
    www.herbach.com, or AllElectronics. They are also found in older and
    cheaper microwave ovens, so you could go to a dump and scrounge a bunch for
    free.

    If you are building them for your own use, you can get by with a solid
    state relay, driven by a simple circuit (a PIC would be my choice), but you
    can do it with a 555 timer, maybe with a large RC, but even better with a
    counter. You can use a wallwort for power.

    If you intend to sell them, you probably will need to build them per UL
    standards and have them tested.

    Paul
     
    Paul E. Schoen, May 27, 2007
    #4
  5. Rob

    Gary Tait Guest

    "Rob" <r> wrote in news:4658e6c9$0$3183$:

    > I bought a 110v rotary timer and wired it to an outlet. Now I can
    > turn the dial and it will turn off the outlet in 60 minutes.
    >
    > The timer cost $21, that seems pretty high. I have seen cheap timer
    > IC, but they take low voltage. Does anyone know where I could buy the
    > necesarry parts to do the same thing for a lot less. I need to make
    > quite a few of these.
    >
    > Thanks,
    > Rob
    >


    You will need to get them approved, likely, depending on your situation.
     
    Gary Tait, May 29, 2007
    #5
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