H
Hiran
- Jan 1, 1970
- 0
Hi everybody,
Background:
I am going to develp a device which can used to send a DTMF signal
from a remote Telephone.
Problem :
1)
How I can find out whether the telepone line has been connected to my
device?
Is there any voltage or impedence change? Send me a circuit diagram to
I dentify this situation.
2)
What is the good isolation transformer to connect the telephone cabel
to my device. How can I buy it?
Send me a mail : [email protected]
Thanks.
Background:
I am going to develp a device which can used to send a DTMF signal
from a remote Telephone.
Problem :
1)
How I can find out whether the telepone line has been connected to my
device?
Is there any voltage or impedence change? Send me a circuit diagram to
I dentify this situation.
2)
What is the good isolation transformer to connect the telephone cabel
to my device. How can I buy it?
Send me a mail : [email protected]
Thanks.