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Thread: Emergency flasher help...?

  1. #16
    Scratch Newbie
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    Boy, lotsa help!
    Gotta love it.
    So is the one that bogdanfirst posted about 5 posts up the re-drawn one?


  2. #17
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    Why You need relays?It sucks more current as load.Connect the LED-s direct to collectors. (The circuit accu-powered)

  3. #18
    bogdanfirst Good bogdanfirst Good
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    first the scematic is the one above( half a meter or so.. :lol: ).
    i thought or relays for using high power lamps, but if you only use leds its ok to connect them dicetly between the collector and +12v

  4. #19
    pkshima Good pkshima Good
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    please guys keep my heart :P

    use ULN2003A IC. it has seven darlington pairs inside. each can give bout 0.5 AMP. whats more the outputs can be paralleled to furnish more current.

    bye,
    Shima.
    Its not the Practice that makes a man perfect. Its the Man who makes the practice perfect
    ----- Pradeep K. Shima -----

  5. #20
    bogdanfirst Good bogdanfirst Good
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    well you could use that too, but there is no need.
    if the lights are needed for a vehicle, i dont think that current consumption is a big problem, so the realys can be used.

  6. #21
    pkshima Good pkshima Good
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    the IC wud look cool and also would be compact and help a great deal in
    making the layout easier.
    Its not the Practice that makes a man perfect. Its the Man who makes the practice perfect
    ----- Pradeep K. Shima -----

  7. #22
    bogdanfirst Good bogdanfirst Good
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    well it depends in tha case, maybe there wont be needed relays and the is, just the transistors.

  8. #23
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    The way I got the lights right now, I have to close the switch to turn them on. I dont care ir relays are used or not, they would take up space but that's not a huge conceren.
    I could change my lights to not use relays, I just needed to know how to make an output do the flahing pattern I wanted. I dont know 555 timers good yet.

  9. #24
    bogdanfirst Good bogdanfirst Good
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    check this out. it says a lot of how to use 555.
    and the circuit i atteched does this: red-pause-red-pause-white-pause-white-pause-back to beginning.
    or you can have other color leds. but i remembered that you said you have white and red.
    http://www.uoguelph.ca/~antoon/gadgets/555/555.html

  10. #25
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    Thanks, which circuit is the one you're talking about. There's quite a few on there... :roll:
    That is exactly how I want it to work though.

  11. #26
    bogdanfirst Good bogdanfirst Good
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    see back, i posted a circuit on the first page of thid topic.

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