Tag: timer

14 Comments

Secret knock detector with 555

  By electrobob February 28, 2011 February 8, 2017 Projects

Detecting a secret knock pattern using 555’s. Continue reading

9 Comments

555 / 556 H bridge

  By electrobob February 22, 2011 February 8, 2017 Ideas and Articles, Projects

Simple H-bridge using 555’s. Continue reading

42 Comments

LED UV exposure box part 2, the timer

  By electrobob September 29, 2010 February 8, 2017 Projects

Buiding a timer for a PCB UV exposure box. Continue reading

47 Comments

LED UV exposure box part 1, the box

  By electrobob June 24, 2010 February 8, 2017 Projects

Building a nice UV exposure box to make PCBs. Continue reading