🚀 go-pugleaf

heacock@kuhub.cc.ukans.edu (Doug Heacock) writes:

>I'm putting together a quick-and-dirty circuit that will light 10
>LED's in sequence, one after the other.  Here's my idea so far:  I
>intend to use half of a 4011 (quad 2-input NAND gate) as a clock
>oscillator to drive half of a 4518 (dual synchronous up counter),
>which will in turn drive a 4028 (BCD-to-decimal decoder), which will
>actually drive the LED's.  I was thinking I could connect all of the
>LED cathodes to ground through a single 330-ohm resistor, since only
>one would be lit at a time.

>Does this sound workable?  I welcome more elegant solutions--these
>chips just happen to be the ones I have on hand at the moment.
>+-----------------------------------------------------------------+
>| Doug Heacock, Academic Computing   | heacock@kuhub.cc.ukans.edu |
>| Services, The University of Kansas | heacock@ukanvax.bitnet     |
>| Lawrence, KS 66045                 | Amateur radio: N0NZQ       |
>+-----------------------------------------------------------------+


Why not use a LM555 timer and connect that to a CD4017 decade counter, which
will drive the LED's?  It's simpler to construct too.


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(_@_)                                                                   (_@_)
|   |   Raymond Yeung               Internet: Nimbus@uiuc.edu           |   |
|   |                                         rky57514@uxa.cso.uiuc.edu |   |
|   |   EE student at the                                               |   |
|   |   University of Illinois    CompuServe: 70700,1011                |   |
|   |   at Urbana-Champaign                                             |   |
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