555 astable problem
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Posted by Joe on January 2, 2007, 3:46 pm
Please log in for more thread options I am trying to set up a cmos 555 as an astable (oscillator). I would like it to output 1 pulse (that is, ON, or high) for 1 second and then stay low for 5-10 seconds before repeating the process again and again. I used to know how to do this, but now I am using the design equations and everything seems to be giving me around a 50% duty cycle. Maybe a 555 is not the right component to use? Any links, advice, or info is greatly appreciated. TIA, Joe | ||||||||||||||||||||||
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Posted by Charles Schuler on January 2, 2007, 4:18 pm
Please log in for more thread options http://www.doctronics.co.uk/555.htm | ||||||||||||||||||||||
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Posted by Joe on January 2, 2007, 10:07 pm
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Charles Schuler wrote: > >I am trying to set up a cmos 555 as an astable (oscillator). I would
> > like it to output 1 pulse (that is, ON, or high) for 1 second and then > > stay low for 5-10 seconds before repeating the process again and again. > > I used to know how to do this, but now I am using the design equations > > and everything seems to be giving me around a 50% duty cycle. Maybe a > > 555 is not the right component to use? Any links, advice, or info is > > greatly appreciated. >
> http://www.doctronics.co.uk/555.htm Hello Charles, Yes, thank you so much for that link, I remembered there was a diode involved somewhere. That page even gives the design equations. It's done, I just did the calcs and put the resistors and diode in, and I now have a 1 sec pulse about every 7 seconds. Thank you again. Joe | ||||||||||||||||||||||
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Posted by Charles Schuler on January 2, 2007, 10:13 pm
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>
> Charles Schuler wrote: >> >I am trying to set up a cmos 555 as an astable (oscillator). I would
>> > like it to output 1 pulse (that is, ON, or high) for 1 second and then >> > stay low for 5-10 seconds before repeating the process again and again. >> > I used to know how to do this, but now I am using the design equations >> > and everything seems to be giving me around a 50% duty cycle. Maybe a >> > 555 is not the right component to use? Any links, advice, or info is >> > greatly appreciated. >>
>> http://www.doctronics.co.uk/555.htm >
> Hello Charles, > > Yes, thank you so much for that link, I remembered there was a diode > involved somewhere. That page even gives the design equations. It's > done, I just did the calcs and put the resistors and diode in, and I > now have a 1 sec pulse about every 7 seconds. Thank you again. You are welcome and Happy New Year (I guess it is still OK to say that). | ||||||||||||||||||||||
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Posted by Rich Grise on January 2, 2007, 4:19 pm
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On Tue, 02 Jan 2007 12:46:21 -0800, Joe wrote: > I am trying to set up a cmos 555 as an astable (oscillator). I would like
> it to output 1 pulse (that is, ON, or high) for 1 second and then stay low > for 5-10 seconds before repeating the process again and again. I used to > know how to do this, but now I am using the design equations and > everything seems to be giving me around a 50% duty cycle. Maybe a 555 is > not the right component to use? Any links, advice, or info is greatly > appreciated. > You might find some of these links useful: http://www.google.com/search?q=555+astable+circuit Good Luck! Rich | ||||||||||||||||||||||
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> like it to output 1 pulse (that is, ON, or high) for 1 second and then
> stay low for 5-10 seconds before repeating the process again and again.
> I used to know how to do this, but now I am using the design equations
> and everything seems to be giving me around a 50% duty cycle. Maybe a
> 555 is not the right component to use? Any links, advice, or info is
> greatly appreciated.