[comp.dcom.telecom] Message Lights For Audix Systems

kthompso@entec.wichita.ncr.com (Ken Thompson) (12/05/89)

For those with audix, an old phone, and no money to purchase an AT&T
phone with a message light...  Here is a circuit that works to
indicate an audix message is waiting.  Mount the led that lights in a
conveniently visible location.

                          |\ |
        <---------+-------| >|-----+-----'\/\/\/\/`-----+
                  |       |/ |     |        22k         |
                  |        led     |                    |
to phone          |                |                    |
line              |       | /|     |                    |
(green/red)       +-------|< |-----+                    |
(L1/L2)                   | \|                          |
                           led                          |
                                                        |
                                                        |
        <-----------------------------------------------+
                                                         
This is for information only.  No one is encouraged to actually use
the circuit.  Legal or moral considerations of modifying or destroying
company property are not addressed.

No warranty expressed or implied.  Not liable for any direct,
consequential, or incidental loss or damage.  This circuit has not
been certified as complying with Part 68 of FCC regs.
                                                         
WARNING: Telephone circuitry contains potentially lethal voltages.  No
user serviceable parts inside.  Refer all repairs, adjustments and
modifications of any equipment to qualified service personnel.


Ken Thompson     N0ITL  
NCR Corp.  3718 N. Rock Road            
Wichita,Ks. 67226  (316)636-8783       
Ken.Thompson@wichita.ncr.com