🚀 go-pugleaf

Hello Netland !

I am building a device to monitor multiple phone lines for
a) availability (any official line attached)
b) activity (in use ?)
c) toll pulses (16khz 0.5sec 15V amplitude)

c) is not a problem, I have a circuit.
I also have a solution for b, but I'd like to combine it with a).

The problem:
I want to drive a LED in an optocoupler so that it is active when
there is any voltage on the line.
The line has 48-60V when idle, 6-13V when active.
As far as I know, there may be higher AC voltages when ringing.

My problem is: 
How do I make the LED light at all these odd voltages ?
If a line-powered solution is possible, it'd be the best one.

Next thing is, I'd like to have another optocoupler signalling
6-13V or 48-60V (larger than an adjustable voltage).

Any help will be appreciated,
 Greetings and many thanks in advance,
-- 
bkr@drdhh.hanse.de - Bjoern Kriews - Stormsweg 6 - D-2000 Hamburg 76 - FRG
 /tmp # cd /dev  
 /dev # ls -l exrom           (me, Oct 22)
exrom not found