Modifying a baby monitor receiver

Modifying a baby monitor receiver (into a computer line-in, input device).

First I took a stereo 1/8 inch to RCA cord, and cut-off the RCA plugs. The plug MUST be a stereo plug as that is what your soundcard plug will require.

The cord has two insulated wire (red and white) surrounded by strands of shielding wire.

I twisted the shielding wires together and tinned them (a solder cover). then after removing about 1/4" of insulation, I also twisted and soldered both the red and white wires together. This would not normally be correct but in this case we are taking a mono receiver and feeding the audio into a stereo input jack.

On this unit it was easy to tell which wires went where. But carefully use the test method below before soldering if you not absolutely positive. Then once assembled TEST AGAIN.

I used an old PC speaker with the correct input jack. The sending unit was in another room (with a TV on). Hearing the TV clearly, through the old PC speaker) let me know all worked well.

Now watch the video to see how to setup the monitor as a computer microphone.