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From: BEC.SHAPIN@USC-ECL.ARPA (Ted Shapin)
Newsgroups: mod.telecom
Subject: Looking for a line in use circuit
Message-ID: <8612220415.AA02214@ucbvax.Berkeley.EDU>
Date: Mon, 15-Dec-86 19:00:16 EST
Article-I.D.: ucbvax.8612220415.AA02214
Posted: Mon Dec 15 19:00:16 1986
Date-Received: Mon, 22-Dec-86 03:04:59 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 7
Approved: telecom@xx.lcs.mit.edu

I would like to build a LED driver that will light when a line is in
use.  I guess I could use a CMOS inverter and drive it from the line.
Does anyone have a circuit?
Ted.

[DAK sells this circuit as "Drew's Brainstorm" for ~$10.  A 9-volt
 battery eliminator is recommended by yours truly.  -Elmo]