Electronics_101 : Electronics Learning Group

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Discussion of electronics for beginners and experienced alike. Hopefully we can all exchange ideas, circuits, schematics, and pictures of all disciplines of electronics including both analog and digital.

When asking for help, be specific, please. But don't forget to give us the big picture. Often it's easier to help solve your problem, than help solve your solution.

Also visit the Homebrew_PCBs list for information on making printed circuit boards: Homebrew_PCBs

Please note, this is -not- a job posting board.

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Re: presence of AC voltage/current ... Use the PNP device to pull up a resistor. The output will be '0' when the motor is not running and '1' when it is. This assumes that the input circuit Posted - Wed May 22, 2013 12:32 am	rtstofer Send Email
Re: Time unit of 555 If you use ohms for the Rs and farads for the C, then the time is in seconds. If you use R in ohms and C in micro farads, then the time is in microseconds. Posted - Tue May 21, 2013 11:42 pm	John Popelish jpopelish Send Email
Re: presence of AC voltage/current I came across the following device, CR9321 which is almost exactly what I need. Almost, because ideally I needed a NC switch output. Link = Posted - Tue May 21, 2013 10:43 pm	Michael mmk_tsm Send Email
Re: Time unit of 555 ... Are you sure you meant 0.02 mF = 0.02 milliFarad = 20 uF? ... No, you have ontime = 9.993 offtime = 9.979 Check your math. Never ignore unit multipliers! Posted - Tue May 21, 2013 10:09 pm	Andy ingrahama Send Email
Re: Time unit of 555 try out this 555 timer calculation website... http://freespace.virgin.net/matt.waite/resource/handy/pinouts/555/ ... [Non-text portions of this message have Posted - Tue May 21, 2013 10:03 pm	Frank Mead fmead Send Email
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