A friend asked me where they could buy a telephone recording interface to use to connect their pots landline to their digital voice recorder.
I immediately thought of the good old Radio Shack 43-2208. But to my surprise, I discovered that Radio Shack no longer sells it, (one of many useful products they discontinued
).
Searching around the web, most of the currently available devices are either very overpriced digital recorders with an interface built in, or interfaces for pc's via usb port.
Thankfully, there are still some circuits posted on the web.
I found these two websites...
http://www.sagebrush.com/phontech.htm
http://www.epanorama.net/documents/telecom/teleinterface.html#audioint
Between the two sites there are approximately 10 basic circuits and several more advanced circuits.
My friend does not need a circuit for a recording studio or a broadcast studio,
just a circuit that will yield relatively even volume levels for both the local and distant call participants.
Could someone take a look at these circuits and give me a little guidance as to which one to build,
before I start looking for parts on Mouser, Digikey, MCM, Newark, Arrow, and Jameco's websites.
Thanks for any guidance.
I immediately thought of the good old Radio Shack 43-2208. But to my surprise, I discovered that Radio Shack no longer sells it, (one of many useful products they discontinued
).Searching around the web, most of the currently available devices are either very overpriced digital recorders with an interface built in, or interfaces for pc's via usb port.
Thankfully, there are still some circuits posted on the web.
I found these two websites...
http://www.sagebrush.com/phontech.htm
http://www.epanorama.net/documents/telecom/teleinterface.html#audioint
Between the two sites there are approximately 10 basic circuits and several more advanced circuits.
My friend does not need a circuit for a recording studio or a broadcast studio,
just a circuit that will yield relatively even volume levels for both the local and distant call participants.
Could someone take a look at these circuits and give me a little guidance as to which one to build,
before I start looking for parts on Mouser, Digikey, MCM, Newark, Arrow, and Jameco's websites.
Thanks for any guidance.
