Re: Phone line interface for DTMF
- From: Jasen <jasen@xxxxxxxxxxx>
- Date: 23 Jun 2007 05:32:55 GMT
On 2007-06-22, jmarc <jmarc@xxxxxxxxxxxxxxxxxxxxx> wrote:
This is a multi-part message in MIME format.
Will you turn that off please.
Hi all,
I would use a 600 ohms phone line transformer
to have dc isolation, for transmitting DTMF from
a computer.
My very simple desing work at home, but
doesnt work at the office. It seams I don't
deliver enough audio level of DTMF.
yes, there is a certain level needed.
Earlier, I bought a very simple "play/record"
device who did work (more audio DTMF level),
but humming soon happen with differents
configuration.... (not use transformer in)
It is probalby caused by different ground
voltage level, between computer and Telco gnd.
Is someone out there, can rely me to some pretty
schematics on the web, or have any suggest
to do it right?
I've got an off-the-shelf solution:
Use a modem. send it "atx1dt" followed by the symbols representing the DTMF you want to send
Bye.
Jasen
.
- Follow-Ups:
- Re: Phone line interface for DTMF
- From: jmarc
- Re: Phone line interface for DTMF
- References:
- Phone line interface for DTMF
- From: jmarc
- Phone line interface for DTMF
- Prev by Date: Were Republications, we don't need no sticken "separation of powers"
- Next by Date: Re: Electronic Air Pressure Regulator
- Previous by thread: Re: Phone line interface for DTMF
- Next by thread: Re: Phone line interface for DTMF
- Index(es):
Relevant Pages
|
