|
Science Forum Index » Electronics - Misc Forum » On hold telephone message circuit
Page 1 of 1
|
| Author |
Message |
| Charles Jean |
 Posted: Wed Dec 06, 2006 2:59 pm |
|
|
|
Guest
|
Is there a way to play a wav file over an open telephone line? Can
the earphone output of a sound card be used? Would it need to be
amplified or attenuated? Capacitance coupled? |
|
|
| Back to top |
|
| Luhan |
| Posted: Wed Dec 06, 2006 3:08 pm |
|
|
|
Guest
|
Charles Jean wrote:
Quote: Is there a way to play a wav file over an open telephone line? Can
the earphone output of a sound card be used? Would it need to be
amplified or attenuated? Capacitance coupled?
A 600-600 ohm transformer is the usual way. The headphone level is a
pretty good match, but if you pump too much signal into the phone line,
you will piss-off the phone company.
Luhan |
|
|
| Back to top |
|
| Don Bowey |
| Posted: Wed Dec 06, 2006 5:21 pm |
|
|
|
Guest
|
On 12/6/06 10:59 AM, in article ld4en2plh6cj0bgj1uv635p7vu4ge6rdo2@4ax.com,
"Charles Jean" <alchemcj@earthlink.net> wrote:
Quote:
Is there a way to play a wav file over an open telephone line? Can
the earphone output of a sound card be used? Would it need to be
amplified or attenuated? Capacitance coupled?
You should post this at s.e.b.
It's fairly simple to do, and the sound card probably has high enough output
for the job. |
|
|
| Back to top |
|
| |
