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DC Light Sequencer

Discussion in 'General Electronics Discussion' started by Carl Hall, May 8, 2018.

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  1. Carl Hall

    Carl Hall

    May 8, 2018
    Hi, my 1st ever post. I recently bought a Metro Tube Line board. It still has the wiring for each bulb at each station. I have tested and the bulb takes 5v DC. My question is where could I find a sequencer to light the bulbs 1 at a time, at each station? There are at least 24 stations/bulbs end to end. Any advice would be greatly appreciated. Thanks

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  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Welcome to EP.
    Today the most simple arrangement will ionvolve a microcontroller for the sequencing plus a set of driver transistors for powering the lamps.

    Of course other methods do exist. Here are a few examples:
    - You could use a digital counter. A CD4017 chip will count to 10, for more lamps (24 in your board) you will need additional decoding logic.
    - Or use the discrete multistage light sequencer from this website which can easily be expanded to 24 stages.
  3. timff


    Apr 13, 2018
    You may not find a purchasable sequencer at a realistic price. To build one there are several approaches. You may want to select a cascadeable shift register to get the number of outputs you need. If your bulbs take more than 10-20ma each, you may have to isolate the digital outputs using higher current transistors to drive the bulbs.
  4. Carl Hall

    Carl Hall

    May 8, 2018
    Thankyou Harold I will take a look
  5. Carl Hall

    Carl Hall

    May 8, 2018
    Thankyou I will take a look
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