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12 volt delay timer

Discussion in 'General Electronics Discussion' started by Autowraith, May 5, 2022.

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  1. Autowraith

    Autowraith

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    May 5, 2022
    Hello there, I am new to the forum and electronics.
    I am trying to make a 12volt delay timer for mini fridge/ cooler box for insulin.
    I know on GM vehicles the radio has a delay, but shuts off after opening a door.
    I need it to stay on for 10 to 30 minutes after vehicle shut off. Just looking for some ideas.
     
  2. AnalogKid

    AnalogKid

    2,639
    764
    Jun 10, 2015
    Sounds like you need a circuit or device that is powered directly from the battery, so the timer has operating power when the vehicle is off, and feeds battery power to the cooler through a controlled switch. If so, what are the specs for the cooler? Min and max voltage, and max current?

    30 minutes is a loooooong time for a simple R-C (resistor-capacitor) timer circuit like a 555. A better choice is something based on a counter or divider like the CD4060.

    If you have any programming experience, a microcontroller solution could be easier for you. There still is some circuitry involved, but not as much.

    ak
     
  3. crutschow

    crutschow

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    May 7, 2021
    A timer module such as this, should work for you.
     
  4. AnalogKid

    AnalogKid

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    Jun 10, 2015
    I almost said something about fishing around on ebay for a timer module. $10 and free shipping - that is sick.

    ak
     
    Last edited: May 5, 2022
  5. crutschow

    crutschow

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    May 7, 2021
    Sick?
     
  6. Martaine2005

    Martaine2005

    4,087
    1,120
    May 12, 2015
    It’s a teenagers term for ‘great’, a little like ‘buff’ for a good looking man!.
    And how a sentence is started with ‘So’. And ‘like’ every other word in a sentence. A USA thing exported again!.

    Martin
     
    Arouse1973 likes this.
  7. crutschow

    crutschow

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    May 7, 2021
    Rad.
     
    Arouse1973 and Martaine2005 like this.
  8. CircutScoper

    CircutScoper

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    Mar 29, 2022
    57.295779513082320876798154814105... degrees?
     
  9. Bluejets

    Bluejets

    5,615
    1,188
    Oct 5, 2014
    So is it already "on" during engine run..??
    If so, what turns it on and off there..?
    You may need to look at how you will trigger the timer shown.
    You might need to sketch up a wiring diagram of your requirements.
     
    Last edited: May 6, 2022
  10. crutschow

    crutschow

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    May 7, 2021
    Also Rad (approximately).
     
  11. John Canon

    John Canon

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    Jun 1, 2022
    You are so lucky, my scientific calculator will only show 12 digits. I am stuck with 57.2957795130, and I never know if the trailing zero rounds up or down. My Archer antenna rotator is getting confused.
     
  12. crutschow

    crutschow

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    May 7, 2021
    My HP42S (virtual) calculator on my computer gives 57.29577951308232087679815481410517 degrees.
    Good enough for government work. ;)
     
  13. AnalogKid

    AnalogKid

    2,639
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    Jun 10, 2015
    My HP-35 (real) says 57.29577950.

    God has spoken.

    ak
     
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