Dave celebrates the classic 555 timer IC by building the Evil Mad Scientist "three fives" discrete timer kit. Some scope measurements and an explanation of the internal 555 timer circuitry follow. Construction: http://youtu.be/U6qZPx4uD0g?t=5m10s Testing: http://youtu.be/U6qZPx4uD0g?t=34m35s Circuit Description: http://youtu.be/U6qZPx4uD0g?t=38m16s Waveforms: http://youtu.be/U6qZPx4uD0g?t=54m35s Classic old Signetics 555 timer datasheet: http://serge.bertorello.free.fr/compsnts/ne555%20&%20ne556.pdf The kit: http://shop.evilmadscientist.com/productsmenu/tinykitlist/652 Han's Book on Analog chip design: http://www.designinganalogchips.com/ Forum: http://www.eevblog.com/forum/blog/eevblog-555-555-timer-kit/
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