Electronics ? - What would I need to make.....
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Electronics ? - What would I need to make.....
What would I need to make a small device which has a micro-switch which when activated emits a beep after maybe 10 seconds.
Switch, beeper, battery.... but what does the time delay ?
Switch, beeper, battery.... but what does the time delay ?
#3
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Do these help?
http://forum.allaboutcircuits.com/sh...ad.php?t=17367
http://www.aaroncake.net/circuits/relaytim.asp
Haven't a clue myself. Was always crap at electrics. Though I did fix the old man's mobile today that was repeatedly switching itself on then off etc etc. Just used a pencil eraser and all was well.
Dave
PS: would have said 'used a rubber ...' but that's had connotations ever since I was a teenager sniggering at jokes along those lines ...
http://forum.allaboutcircuits.com/sh...ad.php?t=17367
http://www.aaroncake.net/circuits/relaytim.asp
Haven't a clue myself. Was always crap at electrics. Though I did fix the old man's mobile today that was repeatedly switching itself on then off etc etc. Just used a pencil eraser and all was well.
Dave
PS: would have said 'used a rubber ...' but that's had connotations ever since I was a teenager sniggering at jokes along those lines ...
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Another option: http://focus.ti.com/general/docs/lit...b&fileType=pdf
You'll need two - one to generate a signal which goes high for 10s after the switch closes, and another to then generate a beep of the required length.
John's suggestion of a 555 is probably better, though. See:
http://en.wikipedia.org/wiki/555_timer_IC
You'll still need two, though, for the same reason - suggest you use a 556, which includes both on the same chip:
http://uk.farnell.com/jsp/search/bro...atchallpartial
[edit]: you'll probably also need to drive the beeper with a transistor, and depending on what type you use, you may need a third 555 to generate an audio waveform to drive it.
You'll need two - one to generate a signal which goes high for 10s after the switch closes, and another to then generate a beep of the required length.
John's suggestion of a 555 is probably better, though. See:
http://en.wikipedia.org/wiki/555_timer_IC
You'll still need two, though, for the same reason - suggest you use a 556, which includes both on the same chip:
http://uk.farnell.com/jsp/search/bro...atchallpartial
[edit]: you'll probably also need to drive the beeper with a transistor, and depending on what type you use, you may need a third 555 to generate an audio waveform to drive it.
Last edited by AndyC_772; 06 December 2010 at 07:39 AM.
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If anyone's interested (and doesn't already know about it!): You can get a complete free SPICE simulator, which includes the 555, from Linear Tech at:
http://www.linear.com/designtools/software/ltspice.jsp
I use it all the time; they intend it primarily to help engineers design circuits around their power supply controllers (hence the alternative name SwitcherCAD) - but it also includes all the usual passive components and a lot of discrete semiconductors as well.
As a tool for learning about how circuits work and for prototyping a project like this, it's ideal
http://www.linear.com/designtools/software/ltspice.jsp
I use it all the time; they intend it primarily to help engineers design circuits around their power supply controllers (hence the alternative name SwitcherCAD) - but it also includes all the usual passive components and a lot of discrete semiconductors as well.
As a tool for learning about how circuits work and for prototyping a project like this, it's ideal
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