| Author |
Message |
Bill Johnson
Guest
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 Posted:
Wed Aug 10, 2005 12:35 am Post subject:
"Line in use light" |
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Hi, I hope I'm not posting to the wrong group.
I have a pretty standard touchtone desk phone and want to install a small
LED light the would come on whenever anyone is on one of the other phones in
the house.
What resources are there available so I can do this on the cheap??
Please respond by email if necessary.
81162@sbcglobal.net
Thanks, Bill Johnson
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Guest
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| Posted:
Wed Aug 10, 2005 12:35 am Post subject:
Re: "Line in use light" |
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Bill Johnson <81162@sbcglobal.net> wrote:
| Quote: | Hi, I hope I'm not posting to the wrong group.
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It's OK, but sci.electronics.design might be a little better -
cross-posted and followups set.
| Quote: | I have a pretty standard touchtone desk phone and want to install a small
LED light the would come on whenever anyone is on one of the other phones
in the house.
|
There are several circuits to do this at
http://www.repairfaq.org/ELE/F_ASCII_Schem_Tel.html .
Matt Roberds |
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DaveM
Guest
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| Posted:
Wed Aug 10, 2005 7:38 am Post subject:
Re: "Line in use light" |
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"Bill Johnson" <81162@sbcglobal.net> wrote in message
news:OpaKe.3655$zr1.2903@newssvr13.news.prodigy.com...
| Quote: | Hi, I hope I'm not posting to the wrong group.
I have a pretty standard touchtone desk phone and want to install a small
LED light the would come on whenever anyone is on one of the other phones
in
the house.
What resources are there available so I can do this on the cheap??
Please respond by email if necessary.
81162@sbcglobal.net
Thanks, Bill Johnson
.. |
http://www.discovercircuits.com/PDF-FILES/1phostat.pdf
--
Dave M
MasonDG44 at comcast dot net (Just subsitute the appropriate characters in
the address)
Never take a laxative and a sleeping pill at the same time!!
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Watson A.Name - \"Watt Su
Guest
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| Posted:
Sun Aug 28, 2005 4:35 pm Post subject:
Re: "Line in use light" |
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"DaveM" <masondg4499@comcast99.net> wrote in message
news:Lq2dncsh0Is09WTfRVn-rw@comcast.com...
| Quote: | "Bill Johnson" <81162@sbcglobal.net> wrote in message
news:OpaKe.3655$zr1.2903@newssvr13.news.prodigy.com...
Hi, I hope I'm not posting to the wrong group.
I have a pretty standard touchtone desk phone and want to install a
small
LED light the would come on whenever anyone is on one of the other
phones
in
the house.
What resources are there available so I can do this on the cheap??
Please respond by email if necessary.
81162@sbcglobal.net
Thanks, Bill Johnson
.
http://www.discovercircuits.com/PDF-FILES/1phostat.pdf
--
|
The good thing about this circuit is that it flashes, so it draws
attenion to the LED. The bad thing about it is that it uses a CMOS
part, which is susceptible to being zapped by lightning. It should have
a .02uF bypass capacitor from pin5 to ground to reduce the possibility
of a transient voltage spike zapping the chip. But it is still
susceptible. So buy a few spare chips and use a socket, and when it
gets zapped and quits working, just replace the chip. ;-) |
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