Well, here's my entry into the phone-in-use contest:
http://home.earthlink.net/~rich_grise/images/InUse.gif
Cheers!
Rich
The Ttranszorb is a good idea. But what is it? What is its specs?
Other Qs are:
You gave no value for the "R?" in the input wire. it should be the
same as the other R1, 100k, so that the line stays balanced.
Why is the tranzorb _after_ the 2 resistors and bridge? I would think
it should be before, to protect those components.
My thought is that by the time the fault voltage gets high enough to
cause the tranzorb to do its job, it has already caused damage to the
LM393 and other components.
I would include two clamping diodes after R5, to the + amd - power
supply. It's also a good idea to put two diodes anti-parallel across
pins 2 and 3 of the LM393 to prevent overvoltage. These are some of
the ways we used to protect the line driver boxes we used all over
campus. Believe me, when a lightning storm comes by, you will need as
much protection as you can get to keep your phone line-connected
equipment running.
--
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###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it:
http://physics.nist.gov/cuu/Units/binary.html
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