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7 led chaser 555 and 4017

Discussion in 'LEDs and Optoelectronics' started by Tony357, Dec 10, 2014.

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  1. Tony357


    Dec 10, 2014
    I have a 7 LED chaser circuit (BELOW) that i moded to get the results that i need.
    Firstly I increased the voltage in the whole circuit from 9V to 18V then i added 2 BC108C's in the darlington pair formation after each output leg of the 4017b chip that i used, before each LED output.

    I think i have blown the first transistors i used I have got new transistors which i believe turn on at 25V they are also BC108C's is there a way i can boost the voltage after the output pins of the 4017B chip to turn on my new transistors to give me the current i need, or would i be able to use another component to replace the Darlington pair with and get the same current gain.

    This is the circuit i started with: [​IMG]
    Last edited by a moderator: Dec 16, 2014
  2. Ian

    Ian Administrator

    Aug 23, 2006
    Welcome to the forums Tony. I've moved this out of the project log section, as that is a showcase for completed projects, rather than questions :).
    KrisBlueNZ likes this.
  3. Colin Mitchell

    Colin Mitchell

    Aug 31, 2014
    What are you illuminating?
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