Mono to stereo input wiring question

[Keskin]

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

 

[Möter]

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. 😉

 

[sreten]

Hi,

Thats not right.

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

🙂/sreten.

 

[Möter]

You are correct, I should have read more carefully. My bad.

 

[sreten]

Is a switched mono socket

An externally hosted image should be here but it was not working when we last tested it.

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.

 

[Keskin]

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:

Notice that the switch is not mandatory, if it`s doable with lets say switching input jacks, it would be even better.

 

[revintage]

Your sketch is not complete. The second UCD must be wired in opposite phase if you want bridging to work.

 

[Keskin]

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

 

[Keskin]

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.

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