Keyboard output circuit - stereo/mono - diyAudio
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Old 15th September 2011, 02:44 AM   #1
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Default Keyboard output circuit - stereo/mono

Tried to search for a topic/thread on this and didn't really find one...

when a keyboard or sound module has stereo outputs labeled as follows:

Left/mono - Right


what is the typical internal circuitry that makes the signal mono when a cable is plugged only in the LEFT/MONO output?
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Old 15th September 2011, 03:15 AM   #2
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The right channel jack has a switching contact that connects the channels together unless a plug is inserted, then it becomes stereo.

Mike
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Old 15th September 2011, 02:31 PM   #3
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Hmmm, ok. Thanks. So, there is no additional resistors, diodes, caps or any other components to alter the audio signal to make it MONO on the left?
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Old 15th September 2011, 03:00 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

Yuo can't simply connect two separate outputs together to derive a mono mixed version.

There has to be some additional complication, e.g. the switching on the right socket
is some form of control signal that goes back to some digitally controlled mixer.

Or the mono signal is simply the left channel only ......

rgds, sreten.
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Old 15th September 2011, 03:02 PM   #5
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So would the mono signal be the left with a little bit of the right mixed in?
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Old 15th September 2011, 03:09 PM   #6
sreten is offline sreten  United Kingdom
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Hi, it will be L only or properly mixed L+R depending on how its done. Rgds, sreten.

(A lot of stuff is essentially mono, with the only stereo being effects e.g. reverb.
In these cases often mono out is simply the mono signal with only left effects,
the (missing) right channel being the mono signal with right effects. This was
typical of many reverbs. L and R in being mixed to mono first, any stereo
in the output was due to the reverb processing applied.)
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Last edited by sreten; 15th September 2011 at 03:18 PM.
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Old 16th September 2011, 12:54 AM   #7
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okay thanks makes sense. How about a signal on a digital piano where the sampled piano was either sampled in stereo, or the sampled sound has been applied across the stereo spectrum? Is there a proper way to combine the R&L stereo signal to mono so that it doesn't sound out of phase? Thanks.
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Old 16th September 2011, 11:36 AM   #8
sreten is offline sreten  United Kingdom
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Hi,

A proper stereo piano with a mono output should arrange that to be correct.

rgds, sreten.
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Old 16th September 2011, 03:04 PM   #9
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ok, so back to the original question. Does anyone know what the internal circuitry of said "proper stereo piano with mono output".. is?
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Old 16th September 2011, 03:13 PM   #10
sreten is offline sreten  United Kingdom
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Hi,

Any number of ways of doing it properly, What keyboard ? service manual ?

rgds, sreten.
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