Tristated output to two common Base transistor issue


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  1. #12
    Join Date
    Aug 2006
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    SWITZERLAND (french speaking)
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    Default "Knight Rider" light

    Well,

    I'm still working on a "Knight Rider" stoplight...

    Because of a extremely narrow space availability inside the original stoplight, I can't add lots of components to the circuit.

    The LEDs have to be powerfull enough to look like, at least, the original bulbs.

    I have made a prototype with "common" LEDs and it works well BUT it is far to weak (... and I have made it with yellow LEDs witch makes it unsuable as stoplight).
    <img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1972&stc=1&d=118910210 0">

    I connected the LEDs like hereunder but this is not longer possible because of the use of transistors (btw this is just the LED connection part). The "curious" disposition of LEDs in this shematic allows me to switch-ON two consecutive LEDs and improve the fluency wipe effect - but this is another story.
    <img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1973&stc=1&d=118910225 7">

    I couldn't find SMD transistors (at DISTRELEC for those who now this supplier) without built-in resistors so I thought it is a common thing (?).

    Hope this helps a little...
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    Last edited by flotulopex; - 6th September 2007 at 19:30.
    Roger

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