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Timer Switch For Ride ON toy

Discussion in 'General Electronics Discussion' started by Plcrocky, Nov 7, 2016.

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  1. Plcrocky

    Plcrocky

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    Nov 7, 2016
    Hello all...I am not going to pretend to be an electrical engineer or anything close. So I have come to the pros....HELP please. I want to convert a childrens 6V ride on train toy to a christmas decoration . To do so I want to be able to add a switch with a timer to it versus having to hold the on button down. Essentially I am trying to set it up to be able to run in intervals say every 15 minutes for 2-3 minutes at a time. What can I do?????
     
  2. AnalogKid

    AnalogKid

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    Jun 10, 2015
    What power is available to the timer circuit?
    What is the max voltage and current the timer circuit has to control?

    For anything over 1 minute, I strongly prefer an oscillator/counter chip to a timer chip like the 555. It's the same body count (number of components), but the accuracy/stability/repeatability is way better. The circuitcan be adjustable sorta like a 555 design, but the part lends itself to fixed-ratio designs. For example, 2 minutes on every 16 minutes would adjust down to 1.5 minutes on every 12 minutes. Does this sound like what you are after?

    ak
     
  3. Plcrocky

    Plcrocky

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    Nov 7, 2016
  4. AnalogKid

    AnalogKid

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    Jun 10, 2015
    When the battery is powering the toy continuously, how long does one charge last?

    ak
     
  5. Plcrocky

    Plcrocky

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    Nov 7, 2016
  6. Plcrocky

    Plcrocky

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    Nov 7, 2016
    Probably in the 2 -3 hour range
     
  7. AnalogKid

    AnalogKid

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    Jun 10, 2015
    The max discharge current for a battery like that is around 10-12 A, so the circuit is the timer driving a 20 A logic level power MOSFET. Logic-level because a standard MOSFET likes around 10 V of gate "drive" (Vgs, the voltage from the gate to the source). 20 A because it always is best for semiconductors to operate at half (or less) of their rated whatever for long term reliability.

    ak
     
  8. Bluejets

    Bluejets

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    Oct 5, 2014
    Could use a 555 timer module with built in relay off Ebay for maybe $3. Just add a momentry button to kick off the timer which will reset and turn off you motor in whatever adjustable time. Usually the modules cover seconds to 10-15 minutes.
     
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