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From: cgordon@vpnet.chi.il.us (Gordon Hlavenka)
Newsgroups: sci.electronics
Subject: Re: LED flasher
Message-ID: <2708f468-467.2sci.electronics-1@vpnet.chi.il.us>
Date: 2 Oct 90 21:55:05 GMT
References: <1990Sep30.043045.22757@sisd.kodak.com> <14193@brahms.udel.edu>
Lines: 22


>... I have the LED's all set and working for running lights etc.
>How... preytel... does one make a "flasher". I'm basically using only
>2 volts er so imput current. I assume there is a simple (cheap?) way?

> Best recommendation is to use an LM 3909 LED flasher chip.  

If you're going to the Shack, you might as well just buy flashing LEDs. 
They come in Green (PN 276-030) or Red (PN 276-036) and the catalog lists
them at $1.29 each.  You can't get much simpler (electrically) than 2 wires.

From the modelling perspective, if you built the whole thing around the
LEDs you might be better off with a flasher chip.  Another advantage of this
is the fact that all your flashers would be synchronized.

Personally, I'm partial to the 555; take your pick.  (Personal philosophy
note--  The 555 and 324 are the peanut butter and ketchup of electronics: If
you have enough of them you can build anything.)

-----------------------------------------------------
Gordon S. Hlavenka            cgordon@vpnet.chi.il.us
Disclaimer:                Yeah, I said it.  So what?