Nov
13
2006

The Omega Machine Part 3 (Xbox to Jamma)

bya Phil at 4:30 AM

Time to post again. This time Xbox to Jamma audio. We learned how to hook up video to our Jamma cab from the Xbox, but now we need a cheap way to do Audio.

XBox to Jamma Audio

There’s a cuple ways to do this, but I always strive for the easiest and cheapest mix.

Let’s take a look at where we left off. I made a better diagram of how we hooked up the video.

Now we need a cheap easy way to hook up the audio. Well one might think at first, just hook up the audio pins from the Xbox a/v cord to the Jamma board. This of course, is wrong. The audio from the Xbox is not amplified and a typical Jamma cab has no audio amplifier.

Ya could build a small audio amplifier circuit, but this is too much of a pain in the ass I think. I did it the easy way. Go down to your cheap computer store or thrift store, and pick up some old computer speakers with a built in amplifier (ie. with Volume Control).

Once ya got the speakers it’s time to do some wire splicing. You should have an “audio in” plug that normally hooks up to a PC. This must be spliced and hooked up to the Xbox cable pins.

It’s stereo so you’ll have a wire for the right speaker a wire for the left and a ground. Right is usually red, left is white, and ground is black. Just wire the right and the left together and make it mono. We will call the left and right wired together “audio+”. Your Jamma cab is probably mono. The ground will be called “audio-“.

So wire your audio+ to pin 14 and your audio- to pin 15 on the Xbox a/v cable. Oh by the way you may have noticed I’ve placed jumper wires between pins 1 and 14, and 2 and 15. Pin one is the right audio+ and pin 14 is the left audio+. Pin 2 is the right audio- and pin 15 is the left audio-. So the jumper pins just make the Xbox cable mono.

Next ya cut off the speaker without the audio amp built into it. We won’t need it.

Open the speaker with the audio amp. You’ll see two wires going to the cone speaker itself. One will probably be red or white and the other will probably be black. Cut these wires and remove the speaker. The black is usually the audio- and the red or white is usually the audio+. Solder the audio- to the speaker- pin on the Jamma board and the audio+ to the speaker+ pin on the Jamma board.

Lets take a look at the hookup with the audio and video hookup.

Now ya should have audio and video on your Jamma cab. Controls should be easy to hook up. But if you need help I’ll probably post later and show ya a cheap easy way to make some arcade controls for our Xbox to Jamma cab.

If your curious as to the restult… Take a look…

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