At 09:42 AM 2/25/00 -0800, you wrote:
>Does anyone know how can I connect DTMF receiver
>(MT8870 for example) to telephone line. I have some
>circuits but there is transformers. Is it possible to
>do this without transformer?
>

Check out

http://www.hut.fi/Misc/Electronics/circuits/teleinterface.html

for all kinds of telephone circuits.

- Dan Michaels
Oricom Technologies
http://www.sni.net/~oricom