Atarivox audio mixing

[Prizrak]

I was using a flat LCD TV to play my Atari games on but some games didn't work with my TV and switching to a CRT solved that problem. Now I've got a new problem. The LCD had a separate right and left audio for composite and I would use one for game audio and the other for Atarivox to mix the two together. My CRT has one audio instead of two. When I try and blend them using a Y jack the Atarivox overpowers the game audio and all I hear is the Atarivox talking. Somehow the Atarivox appears to be putting out so much voltage it overpowers my Atari audio? Anyway around this other than buying a set of computer speakers?

 

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[+save2600]

Look into the audio output... the AtariVox has a volume pot inside. Can carefully pop the case open or use a tiny screwdriver to access it.

[Prizrak]

Think it's because I've got the volume on it turned up and the higher voltage is cancelling my game audio?

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[+save2600]

That was my first thought, but now I'm thinking maybe the AVox is grounding out the signal of your 7800's audio? I have a similar setup and will try combining the two outputs in one, to hear if that's the case. May need a diode or two. 

 

-edit-

 

Yep, that's what's going on. AVox output cancelling/grounding out the 7800's output. 

[Prizrak]

I'll try the volume first but grounding out seems to be what might be going on. The game auto is non existent and all I hear is Atarivox.

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[+save2600]

Just got through testing this. A diode out of the center tap of the AVox's audio helped to isolate, so can combine the two channels that way if you want.

[+Karl G]

Dumb question perhaps, but do you hear the Atari audio when it is plugged in through the Y adapter when the AtariVOX isn't connected to the other end at all?

[+Nathan Strum]

I built a simple circuit to combine the audio. Just need a few resistors - you can splice them into a Y cable if you don't want to build it into a project box.

 

http://cheeptech.com/atarivox.html

[Prizrak]

Dumb question perhaps, but do you hear the Atari audio when it is plugged in through the Y adapter when the AtariVOX isn't connected to the other end at all?

Yeah in the Y the game audio plays when the Atarivox line is pulled.

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[mutterminder]

I don't mix mine,  I just run the original Atari sound to the left channel and the Atarivox to the right channel.

[Prizrak]

I was able to do that with my flat TV but this CRT has one audio and one video jack unfortunately

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[Prizrak]

Got some speakers in today, glad to be hearing the Atarivox talking again.

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[alex_79]

On 4/8/2020 at 1:25 AM, Prizrak said:

When I try and blend them using a Y jack the Atarivox overpowers the game audio and all I hear is the Atarivox talking.

The problem was the Y-cable:

Y-cables can be used to split an audio signal in most cases, but they must never be used to mix 2 signals together. As you experienced, it won't work, and there's even the risk of damaging your equipment in doing so.
You need a resistive network to achieve what you want, like explained in the page linked by @Nathan Strum a few posts above.

 

[Prizrak]

We'll I'm glad I didn't jack anything up.

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