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Apr 13 '17 at 12:32 history edited CommunityBot
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Jul 13 '12 at 11:47 comment added Tony Stewart EE75 The reason I ask about this design signal is your spec is inconsistent. "No glitch" conflicts with reset output with input when active. So you need pulse stretcher added. Why ignore short pulses is important?
Jul 13 '12 at 11:40 comment added Tony Stewart EE75 @jacks Some vendor ceramic caps may work with RC = 100 seconds but there is no guarantee, all substitutes will work. Also if a design relies on extreme low leakage, prudent designers will choose plastic parts (teflon, polystyrene, polyester) with guaranteed specs, at more expen$e or use tantalum without worry. If R value exceeds 10 MΩ, design can become too sensitive to noise, dust, moisture, contamination, & vendor subst. RC is not guaranteed. Unless there is a gauranteed spec. you take a risk of failure with ceramic for long RC time constants.. BTW how is this pulse used?
Jul 13 '12 at 10:17 history edited jacks CC BY-SA 3.0
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Jul 13 '12 at 2:57 comment added jacks @TonyStewart- The o/p ie pin#3 of this ckt must not glitch in any case. If inputs is say > 200ms, then only o/p must go HIGH. In all other cases of input, o/p must remain LOW. 200ms is not a strict value but is a reference value.
Jul 13 '12 at 2:57 comment added jacks @TonyStewart- I think it is the other way. I can't recall where, but I read somewhere that you need to choose low capacitance and high resistor for a desired RC. At the same time it was also mentioned that Electrolytic caps. can make the RC time constant vary by twice! So the site said that the electrolytic caps. need to be chosen carefully. If I found that link I'll post the url.
Jul 12 '12 at 16:22 answer Tony Stewart EE75 timeline score: -2
Jul 12 '12 at 14:19 comment added Tony Stewart EE75 Ceramic capacitors are microphonic with vibration so can be noisy, but "can" have low ESR but unfort. have high leakage and thus short RC Time consts<<100mS that gets worse with temp. Tantalum caps are better. and Plastic caps are best. Let me review your design again.. Does it matter if you get a glitch output for an inputs > 200mS or so do you want it stretched?
Jul 12 '12 at 11:46 answer jacks timeline score: 3
Jul 12 '12 at 2:06 answer Tony Stewart EE75 timeline score: -3
Jul 11 '12 at 3:34 history edited jacks CC BY-SA 3.0
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Jul 6 '12 at 8:30 history edited jacks CC BY-SA 3.0
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Jul 6 '12 at 8:23 history edited jacks CC BY-SA 3.0
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Jul 6 '12 at 8:01 history edited jacks CC BY-SA 3.0
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Jul 6 '12 at 7:49 history edited jacks CC BY-SA 3.0
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Jul 6 '12 at 6:57 history edited Kortuk
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Jul 6 '12 at 6:32 history edited jacks CC BY-SA 3.0
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Jul 4 '12 at 2:55 comment added W5VO jacks, no problem with the edit. @stevenvh is referring to another user (Olin) who likes to use PICs for just about everything. That being said, a small microcontroller would be the preferred solution for anything more serious than a one-off hobby project.
Jul 4 '12 at 2:46 history edited jacks CC BY-SA 3.0
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Jul 4 '12 at 2:35 history edited jacks
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Jul 4 '12 at 2:32 comment added jacks @stevenvh, Sorry I didn't get you exactly, but if you are suggesting to use PIC10F200 for this application, then it is not for me as I need to do this w/o any software/firmware and only with 555 Timer as a base.
Jul 4 '12 at 2:30 comment added jacks @W5VO, Thanks for making editing effort. I really appreciate it.
Jul 3 '12 at 15:01 comment added stevenvh PIC10F200, Olin? :-)
Jul 3 '12 at 14:18 history edited W5VO CC BY-SA 3.0
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Jul 3 '12 at 14:07 history asked jacks CC BY-SA 3.0