On hold telephone message circuit

[Charles Jean]

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?

 

[Luhan]

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

 

[Don Bowey]

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.