Schematic symbol for the <a href="https://en.wikipedia.org/wiki/555_timer_IC" class="extiw" title="w:555 timer IC">555 timer IC</a> microchip.
<a href="//commons.wikimedia.org/w/index.php?title=User:Jacj&amp;action=edit&amp;redlink=1" class="new" title="User:Jacj (page does not exist)">Jacj</a>
2007-05-29
<span class="int-own-work" lang="en">Own work</span>