<p>I designed and built an automatic gear changer for a drag bike using two 555s ... later did it in a PIC12.</p>
<p><blockquote type="cite">On Jan 27, 2011 1:54 PM, "Charles Manning" <<a href="mailto:manningc2@actrix.gen.nz">manningc2@actrix.gen.nz</a>> wrote:<br><br><br>
555s... remember them?<br>
<br>
Here's an opportunity to dust off your old skills and prove that your brain<br>
hasn't fully calcified.<br>
<br>
<a href="http://www.555contest.com/" target="_blank">http://www.555contest.com/</a><br>
<br>
My favourite 555-based device is by metal detector which uses 6 555s. These<br>
days you'd replace that all with a single 8-pin AVR.<br>
<br>
-- Charles<br>
<br>
<br>
<br>
<br>
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