Telephone Dialer

Guest
Hi,

Do anyone know how to creat a telephone dialer (interface with 2 wires)
with a DTMF generator?

Thanks
 
On Sat, 18 Dec 2004 22:15:13 -0800, dereklai2k wrote:

Hi,

Do anyone know how to creat a telephone dialer (interface with 2 wires)
with a DTMF generator?
You might check some of these links:

http://www.google.com/search?q=dtmf+dialer

Good Luck!
Rich
 
There are two ways of doing this, the first which I don't have much
experience with goes like this. Normally accross a telephone line there's
50volts, you just stick a bit of resistance between the two wires so the
voltage drops to a few volts and chuck a signal down it. The other way is to
stick a transformer accross it (with a resistance on it's coils enough to
drop the voltage to a few volts) and stick your signal on the other side.

Josh

<dereklai2k@yahoo.com.hk> wrote in message
news:1103436913.013210.47750@z14g2000cwz.googlegroups.com...
Hi,

Do anyone know how to creat a telephone dialer (interface with 2 wires)
with a DTMF generator?

Thanks
 

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