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Please help me with a simple circuit

Discussion in 'General Electronics Discussion' started by wozaa3, Mar 18, 2016.

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  1. wozaa3

    wozaa3

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    Oct 13, 2013
    Hi can anyone help me I'm wanting to build a firing system for my fireworks I think it should be quite a simple circuit but I can't quite get my head around some safety system I want to in stall I want three LED's next to the switch red (continuity between battery+ and switch keeping lamp off), yellow (continuity between switch and battery-) and green (complete continuity full system lamp on) May you please help me finish this this diagram using as a little extra wiring as possible because this is a basic diagram as there will actually be 20 lamps and switches also the lamps will be 25 foot away so I want to get away with 1+ and 20- wires between the switch and LED circuit board and lamps. So just to confirm I'm looking for help with the single lamp diagram as I will be able to repurpose it into the 20

    Many Thanks
    Warren electronic firing system.png
     
  2. Colin Mitchell

    Colin Mitchell

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    Aug 31, 2014
    What is the V in a circle?
     
  3. wozaa3

    wozaa3

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    Oct 13, 2013
    a voltmeter
     
  4. cjdelphi

    cjdelphi

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    Oct 26, 2011
    Huh?

    Who triggers it? You or a timer?
     
  5. wozaa3

    wozaa3

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    Oct 13, 2013
    me just press the switch
     
  6. Colin Mitchell

    Colin Mitchell

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    Aug 31, 2014
    Do you have electrical igniters ?
     
  7. Alec_t

    Alec_t

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    Jul 7, 2015
    Why do you have two switches in series?
     
  8. AnalogKid

    AnalogKid

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    Jun 10, 2015
    I understand most of it. What is the X in a circle?

    ak
     
  9. davenn

    davenn Moderator

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    Sep 5, 2009
    the lamp
     
  10. wozaa3

    wozaa3

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    Oct 13, 2013
    Yes the lamp would be replaced with electrical igniters but I didn't know what the symbol was for igniters
     
  11. wozaa3

    wozaa3

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    Oct 13, 2013
    Sorry two switchs in series because the first is a key operated safety switch so it can't be operated with out the key
     
  12. AnalogKid

    AnalogKid

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    Jun 10, 2015
    One LED directly across the battery to show that it is installed.
    One LED after the safety (key) switch to show the controller is hot.
    One LED after an output switch to show that the output is live.

    Correct?

    ak
     
  13. wozaa3

    wozaa3

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    Oct 13, 2013
    No I'm using the voltmeter to so battery is installed and controller is hot.
    yes one LED showing circuit live and if the rocket didn't launch it must of been a duff rocket
    another two LED's to show there are no breaks in the circuit be for or after switch so I know if there any issues I know it the switch or lamp (igniter) I don't want to be following all the wires. I'm sure there's away to do it by placing a diode immediately after lamp (igniter).
     
  14. wozaa3

    wozaa3

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    Oct 13, 2013
    still need help please guys
     
  15. elektrroda

    elektrroda

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    Sep 1, 2015
    if you'd like to keep track circuit ( I mean continuity circuit) you must build circuit to measure current . This circuit to show when is short circuit , and when break.how is current of igniter . You give parameter of igniter.

    upload_2016-3-23_8-15-54.png
    here is simple circuit
     

    Attached Files:

  16. wozaa3

    wozaa3

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    0
    Oct 13, 2013
    Sorry for the late reply thanks that seems to of answered my original issues. Just to confirm I'm reading this correctly in this diagram your using the resistor to lower the current below the operating current of the igniter. Now I can't remember the formula to determine what ohm resistor I would need (Max 50mA).
     
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