Bill Marsden's 'from 4 20' circuit x2

Discussion in 'The Projects Forum' started by Fenris, Aug 28, 2009.

  1. Fenris

    Thread Starter Active Member

    Oct 21, 2007
    288
    2
    Hi guys

    Right then heres my next project. Again inspired by Bill's E-book of all things LED! Basically 4 555 timers drive 20 LED's in a varied and haphazard fashion. But with my usual flair for going over the top I am doing a 'from 4 40'.

    It's a bit of a cheat though. I'm using 4 556 chips so it's really an 'from 8 40' circuit :D

    I have all the parts especially the 40 3mm Blue LED's care of Bill (Cheers!)
    In Bills original schematic the timers are fixed at different speeds. With this design I intend to make the speeds variable of some or all of the timers.

    Today I have done the toner transfer of the patterns I devised for the 2 part circuit. The main board (smallest) has the 556's on it and is around 2" square and the larger board for the LED's is 3"square. 10 Wires will connect the 2 boards.

    Heres a pic of the PCB's waiting for etching.

    regards

    Fenris
     
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