cook@gaia.UUCP (Forrest Cook) (10/28/87)
Does anybody out there have any experience with Telephone ring detector
chips? The circuit that I have used is:
O----/\/\/-----(| |)--- <-light-> ---(/\/\/)------O 5 Volts
150K NE-2 | | CdS Cell
Phone Line | |---------------O To Schmitt Trigger
| | 2K
O---------------------- ----/\/\/-------O Ground
This works but is large and ugly. Who makes the ring detector chips
and are they very reliable?
Thanks in advance,
Forrest Cook