Mono to stereo input wiring question - diyAudio
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Old 25th February 2009, 10:30 AM   #1
Keskin is offline Keskin  Turkey
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Default Mono to stereo input wiring question

Hi everybody,

i`am planning on a UcD180 stereo power amp for guitar. Both mono modules will be in one case so there will be 2 mono inputs (depending on what this feature needs, standard mono, switchable or stereo instrument jacks).
So far so good but in addition i need one of the inputs to be able to send its mono signal to both modules simultaneously and that`s my main question.

Most importantly, this feature should be selectable (via switch etc.) and should not have any negative effects on the audio quality.

It would be very nice if you could help me out with some ideas or wiring schematics and the parts needed.

Thanks
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Old 25th February 2009, 11:16 AM   #2
Möter is offline Möter  Germany
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Hello Keskin,
If I didn't get you wrong, you can just use a standard 1/4" stereo jack, since a mono plug, like those used for guitar cables, will send its signal to both channel's contacts anyway.

See this wikipedia page http://en.wikipedia.org/wiki/TRS_connector
and this diagrams of mono/stereo plugs on german wikipedia for clarification of what I'm trying to say.
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Old 25th February 2009, 01:05 PM   #3
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Hi,

Thats not right.

A stereo jack socket will earth the right channel input with a mono jack plug inserted.

/sreten.
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Old 25th February 2009, 02:38 PM   #4
Möter is offline Möter  Germany
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You are correct, I should have read more carefully. My bad.
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Old 25th February 2009, 04:00 PM   #5
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Click the image to open in full size.

Is a switched mono socket

Click the image to open in full size.

Is a switched stereo socket

(all earths are common, no need to be switched)

You need two mono sockets and one stereo.

Wire up the left and right input to the stereo jack fingers.

Wire up the mono tip fingers to the switched stereo tabs.

Wire up the tip switched tab of the mono sockets to the other sockets tip finger.

Voila !

/sreten.
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Old 28th February 2009, 09:35 AM   #6
Keskin is offline Keskin  Turkey
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Thanks for the answers, just saw them because i wasn`t getting any notifications.

I understand that the last wiring example is for the use of 3 jacks in the input section. Or are just the 2 monos on the outside and the stereo is inside the case, responsible for the switching?

This is what i was thinking of:

[IMG]Click the image to open in full size.[/IMG]

Notice that the switch is not mandatory, if it`s doable with lets say switching input jacks, it would be even better.
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Old 28th February 2009, 09:56 AM   #7
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Your sketch is not complete. The second UCD must be wired in opposite phase if you want bridging to work.
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Old 28th February 2009, 05:15 PM   #8
Keskin is offline Keskin  Turkey
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I don`t have the UcD modules yet, right now it`s all about planning, understanding and putting a list of the needed parts together.

The bridged UcD wiring diagrams will be delivered with the modules.

For the moment i need to figure out the input wiring but if the "stereo/ bridged option) of the modules have influence on how the inputs are wired, helpful ideas would ve very welcome.

Thanks
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Old 1st March 2009, 12:33 PM   #9
Keskin is offline Keskin  Turkey
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Join Date: Feb 2009
I think i got it. Much simpler then i thought but i still need someone to confirm that this is going to work without any signal losses etc.



[IMG]Click the image to open in full size.[/IMG]
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