04-10-2010, 07:59 PM
<!-- m --><a class="postlink" href="http://www.techlib.com/electronics/flipflopflash.htm">http://www.techlib.com/electronics/flipflopflash.htm</a><!-- m --> - the very top/first circuit is the two transister circuit thats been used for years to make 2 alternately flashing LED lights (similar to what our level crossing lights here do, flash left/right/left/right)
a good site for a how to on the 555 timer to do the same job( has the advantage of being able to handle much higher currents so that you can have multipule flashing level crossing lights, all syncronised (most level crossings here have a 2 lamp stand either side of the road on both sides ie 4 LEDS required to be lit at a time of 8 total)
<!-- m --><a class="postlink" href="http://www.eleinmec.com/article.asp?1">http://www.eleinmec.com/article.asp?1</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.eleinmec.com/article.asp?3">http://www.eleinmec.com/article.asp?3</a><!-- m -->
a good site for a how to on the 555 timer to do the same job( has the advantage of being able to handle much higher currents so that you can have multipule flashing level crossing lights, all syncronised (most level crossings here have a 2 lamp stand either side of the road on both sides ie 4 LEDS required to be lit at a time of 8 total)
<!-- m --><a class="postlink" href="http://www.eleinmec.com/article.asp?1">http://www.eleinmec.com/article.asp?1</a><!-- m -->
<!-- m --><a class="postlink" href="http://www.eleinmec.com/article.asp?3">http://www.eleinmec.com/article.asp?3</a><!-- m -->
poopsie chicken tush