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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by wfontjr

  1. W

    novice help 555 timer

    i have it on an led for testing, i planned on using in on a relay to start/stop a livewell pump
  2. W

    novice help 555 timer

    thanks for the help
  3. W

    novice help 555 timer

    i was trying to build a timer with a 30 second on and a 3 minute off, i tried using the circuit below on kpsec.com, the one using a diode to get less than a 50% duty, i used r2=1.2M, r1=0.2M and c1=220uF according to the calcs on that page. The output stays on, does not cycle, whats wrong? i...
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