555 Timer, Astable Oscillator Help
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
||||||||||||||||
|
Posted by Gifters on November 6, 2007, 11:25 am
Please log in for more thread options indefinite period of time, no more than a minute, for the application I need it to output 2 signals at about 28 hertz (with some fine tunning) independent of each other, I have a circuits I setup (that I found online) now that seems to work fine except its running in the 3 to 6 hertz range it seems to output both at the same frequency for an indefinite amount of time, I'm new to 555 timers and I've tried looking online for equations but I'm failing to see relation between their circuit and my circuit, here is link to a diagram of the circuit I have http://picasaweb.google.com/Gifters/555TimerHelp/photo?authkey=o6LPg8PSSZg#5129763849743544274 Thanks for your help in advance Gifters | ||||||||||||||||
|
Posted by John Fields on November 6, 2007, 2:04 pm
Please log in for more thread options --- If you want two separate output frequencies you'll need to use two separate timers wired as astables, and if you want to have them both running/stopped for the same time you'll need another timer wired as a monostable in order to do that. What's the range of trim you require for the 28Hz, and what's the range of ON time you need? -- JF | ||||||||||||||||
| Similar Threads | Posted |
| 555 Timer, Astable Oscillator Help | November 6, 2007, 11:25 am |
| Astable Multivibrator | May 21, 2006, 5:12 am |
| 555 astable problem | January 2, 2007, 3:46 pm |
| LM555 as a Astable Multivibrator help!! | July 17, 2006, 4:32 am |
| Sweep Generator possible from 555 Astable circuit? | March 3, 2005, 10:30 pm |
| Astable Multivibrator Generates Sub-Ground Voltages | November 5, 2005, 2:50 pm |
| astable multivibrator issues - 2N3904s work, but not TIP31As | July 3, 2008, 6:25 pm |
| AC adjustable timer, motion sensor timer | March 31, 2007, 6:34 pm |
| The difference between using one 555 timer and a 556 timer for PWM control | August 14, 2006, 11:41 pm |
| PUT Oscillator? | April 5, 2005, 9:12 am |
| LC oscillator | January 29, 2006, 3:14 am |
| oscillator | June 24, 2006, 1:46 pm |
| 12kHz oscillator cct anybody? | May 13, 2005, 1:29 am |
| Clapp oscillator | May 18, 2005, 7:11 am |
| Infrared RC oscillator | January 11, 2006, 3:05 pm |
>indefinite period of time, no more than a minute, for the application
>I need it to output 2 signals at about 28 hertz (with some fine
>tunning) independent of each other, I have a circuits I setup (that I
>found online) now that seems to work fine except its running in the 3
>to 6 hertz range it seems to output both at the same frequency for an
>indefinite amount of time, I'm new to 555 timers and I've tried
>looking online for equations but I'm failing to see relation between
>their circuit and my circuit, here is link to a diagram of the circuit
>I have
>
>http://picasaweb.google.com/Gifters/555TimerHelp/photo?authkey=o6LPg8PSSZg#5129763849743544274