Combining audio from two sources

Thomas & Erin Skoropad

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Jul 2, 2003, 2:54:32 PM7/2/03

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Hello All,
Just contemplating combining audio from two sources into a
stereo headset. The sources would be a handheld scanner and a small
AM/FM Walkman. I presume some sort of mixer......? It would have to be
portable and light. Intended use would be for monitoring aircraft
frequencies while mowing a full size airstrip, and yet being able to
listen to music to aleviate the boredom. Any suggestions?
Thanks in advance.
--
Tom

Dr. John

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Jul 2, 2003, 4:26:54 PM7/2/03

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On Wed, 02 Jul 2003 14:54:32 -0400, Thomas & Erin Skoropad <tes...@tbaytel.net> belch-spoke these
words:

Yes, that would require a 2-channel mixer. But good luck getting one that is readily portable.

John

Mike Beauchamp

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Jul 3, 2003, 3:16:34 AM7/3/03

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Since both of them have independent volume controls, you can just try a
passive mixer.
I was going to suggest just combining the two inputs with resistors on each,
but then I realized that you can get that resistance off of each of their
volume controls.

So, I suggest you just combine their inputs and grounds. Tweak the volume
controls on both until you are happy...

Mike
http://mikebeauchamp.com

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Dr. John

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Jul 4, 2003, 12:16:23 AM7/4/03

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How big are those? Or do you mean a dual-male branched 1/8" stereo cord to female 1/8" connector?
That may work.

John

On Thu, 3 Jul 2003 03:16:34 -0400, "Mike Beauchamp" <newsg...@mikebeauchamp.com> belch-spoke these
words:

Mike Beauchamp

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Jul 4, 2003, 1:50:28 AM7/4/03

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That's exactly what I mean..

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bsmyer

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Jul 3, 2003, 4:16:09 PM7/3/03

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Mike Beauchamp wrote:

>>>Hello All,
>>>Just contemplating combining audio from two sources into a
>>>stereo headset. The sources would be a handheld scanner and a small
>>>AM/FM Walkman. I presume some sort of mixer......? It would have to be
>>>portable and light. Intended use would be for monitoring aircraft
>>>frequencies while mowing a full size airstrip, and yet being able to
>>>listen to music to aleviate the boredom. Any suggestions?
>>>Thanks in advance.

Why not split the stereo input and put the scanner in one ear and the
AM/FM in the other...

Steve

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May 11, 2018, 2:41:51 AM5/11/18

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``an expandable headphone mixer'' will allow the simultaneous monitoing of up to three rigs. The circuit is in ARRL Handbook 1998 section 22.31 . The main component is a lm386 as a mixer with tone controls and it operates from battery. I would try using a tl074 myself, but the circuit looks good.

The mixer was built by Mark Wilson, AA2Z at the ARRL labs. You can probably get the circuit from the ARRL.

Killa “zzDJChris” McKillington

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Jan 20, 2023, 9:43:38 PM1/20/23

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I don't think so. The way you're explaining it, if you had a spare 3.5mm jack, you could splice it onto on of the sides you want to listen to that device on. So one headset, 2 jacks. You could easily run one side to a jack, and vice versa. Then just plug into the 2 devices, and adjust the audio.

You said walkman in one ear, and the other in the other ear, right?

Yeah, just do that.

Killa “zzDJChris” McKillington

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Jan 20, 2023, 9:45:58 PM1/20/23

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sorry, I just read it again. Yes, if you wanted both in both ears, although the splicing I mentioned would give mixed results, ideally you're gonna want a mixer, but try the splice first.