Do I sense defeat?  Tisk tisk.  Why can't you use that TI ring detect chip (I
forget the number, links a piezo to the phone line).  Then use a PIC (thus I did
not specify OT in the subject line) to detect the pulses, and based upon a
 switch
on a pin that indicates ring/ don't ring, re-generate a piezo ring.  Then rig it
into your phones.  Ring signal is 2 seconds on, 4 seconds off.

Chris Eddy
Pioneer Microsystems, Inc.

Wynn Rostek wrote:

> At 03:47 PM 12/18/97 EST5EDT, you wrote:
> >>         One should be careful about the type of load presented to a
> >> telephone line pair.  The equipment at the switch to which your phone is
> >> connected may range in complexity from rotary steppers and mechanical
 relays
> >
> >So basically, your saying that there is no practical, recommended way
> >to cut off ringing from one extension on the inside wiring?  I
> >thought this might be the case, and I would have to set up the ring
> >blocker on the enterence point to the house.  Any other suggestions?
> >
> >
>
> Nah, even in the bad old days when Ma Bell made a marine drill sargent like
> like a cub scout den mother, we used to disable a ringer by taking the case
> off the phone, loosening the terminals and pulling a ringer wire off.  The
> phone then "disappeared" from the scans. ;-)
>
> Wynn