Tmc1715

[WTP Pepper]

Does anyone know where I can find a datasheet. The chip is out of a home telephone.

 

[ben7]

What package is the chip in? An 18 pin DIP package?

 

[WTP Pepper]

It is. I can find a other TCM17xx devices that are from the same family with similar functionality - 2wire to 4 wire phone chip. The 1715 is inside a home telephone I have been given.
I wish to modify the ear piece audio path as a deaf persons aid.

 

[ben7]

It is. I can find a other TCM17xx devices that are from the same family with similar functionality - 2wire to 4 wire phone chip. The 1715 is inside a home telephone I have been given.
I wish to modify the ear piece audio path as a deaf persons aid.

The only one closest to that one is the NTE1715 (in an 18 pin DIP package). The NTE1715 is some sort of display driver. NTE makes components which are mostly retired now, which were made by other manufacturers, like vintage op-amps, etc...

Does this phone thing have a display? If it does, is it that blue-ish glowing type?

Could you get a few pictures of the board? If not, maybe draw out the circuit the chip is in?.. that can help a LOT when trying to find obsolete parts.

 

[WTP Pepper]

Thanks Ben. I have managed through a bit of ground work to isolate the pins I need.