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12v to 9v converter

Comments

  • #2
    humbert
    Registered Users, Registered Users 2 Posts: 5,238 ✭✭✭humbert


    Yeah, I'd assume an alarm would draw far less than three amps. On first use just check it from time to time to make sure it's not getting hot (the regulator that is).


  • #3
    Discodog
    Registered Users, Registered Users 2 Posts: 15,922 ✭✭✭✭Discodog


    Thanks. What's the likely drain on the car battery? I want to be sure that I can leave it on overnight.


  • #4
    humbert
    Registered Users, Registered Users 2 Posts: 5,238 ✭✭✭humbert


    Discodog wrote: »
    Thanks. What's the likely drain on the car battery? I want to be sure that I can leave it on overnight.
    Whatever it says on the alarm really. The voltage regulator shouldn't have an appreciable effect. Then compare that to the capacity of the car battery.

    I'd be amazed if it was likely to be a problem but better to check.


  • #5
    Discodog
    Registered Users, Registered Users 2 Posts: 15,922 ✭✭✭✭Discodog


    It runs for a week on one battery so the draw must be minimal. Thanks for the advice.


  • #6
    whizbang
    Registered Users, Registered Users 2 Posts: 1,953 ✭✭✭whizbang


    Some of these regulators are extremely noisy (electrically speaking), also may not be able to regulate properly at the very low current you are going to be using. If possible, try to get a linear regulator, as the alarm may be sensitive to the quality of the power supply.

    It would be a good opportunity to use a NiCd rechargeable battery also.


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  • #7
    satstheway
    Registered Users Posts: 831 ✭✭✭satstheway


    Used a similar reg to run a electric fencer for a farm. It has no noise and worksas expected


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