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The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

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Old 04-27-2009, 11:06 PM
frenchie29 frenchie29 is offline
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Default Stereo to Mono connector wiring

I need to go from a stereo 3.5 male cable to a stereo 3.5 female connector The thing is the amp I am working on is mono. On the PCB I have Audio In and Ground. How do I wire the female connector to the PCB??

I know with XLR pin 1 & 3 are looped together is it the same for TRS????
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Old 04-27-2009, 11:43 PM
Audioguru Audioguru is offline
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You do not know if the music source will blow up if you short the channels together. I would make a mixer with two series 3.3k resistors.
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Old 04-28-2009, 12:25 AM
frenchie29 frenchie29 is offline
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Quote:
Originally Posted by Audioguru View Post
You do not know if the music source will blow up if you short the channels together. I would make a mixer with two series 3.3k resistors.
What do you mean by mixer? Basically it would be the same as one of those connectors that goes from stereo to mono.
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Old 04-28-2009, 12:44 AM
frenchie29 frenchie29 is offline
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That's what I did for now, I know I'm doubling the impedance but that's all I can think of.

connector---------------PCB

tip-------------------->Audio In
Ring------------------->Audio In
Sleeve----------------->Ground

Last edited by frenchie29; 04-28-2009 at 01:09 AM.
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Old 04-28-2009, 01:38 AM
frenchie29 frenchie29 is offline
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http://www.mediacollege.com/audio/co...jack-mono.html

If I go with this it's

Tip to Audio in
Ring to Ground
Sleeve to Ground

Last edited by frenchie29; 04-28-2009 at 02:25 AM.
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Old 04-28-2009, 10:25 AM
tkng211 tkng211 is offline
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You may try this by adding a few parts. Then you can have the signals from both left and right channels feeding to the mono amplifier.
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Old 04-28-2009, 01:57 PM
frenchie29 frenchie29 is offline
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Very nice, are the resistors necessary? I did it without resistors I taught it would double up the signal level but it didn't. Would jumping the L and R and put 1 10k do the same thing? Also did you make that schematic? The software I use doesn't have any audio symbols at all.

Thanks
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Old 04-28-2009, 08:15 PM
Audioguru Audioguru is offline
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The resistors are the mixer. They mix the left channel with the right channel to avoid shorting the left channel to the right channel that might blow up something.

An XLR connector is a mono balanced signal, not stereo. By shorting one of the balanced wires to ground then the signal becomes unbalanced.
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Old 04-28-2009, 08:57 PM
KL7AJ KL7AJ is offline
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Quote:
Originally Posted by Audioguru View Post
You do not know if the music source will blow up if you short the channels together. I would make a mixer with two series 3.3k resistors.

I agree the simplest and safest method is with just a pair of isolation resistors. (These aren't really in series, except from the point of view of the source ends...they're in parallel "looking" the other way.

eric
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Old 04-28-2009, 11:27 PM
frenchie29 frenchie29 is offline
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What about those stereo to mono connectors they sell at Radio Shack? I think they just mix the 2 signals together. I'll try the resistors tonight. Thanks guys
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