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Old 28th November 2010, 04:34 PM   #1
jpd123 is offline jpd123  United Kingdom
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Angry stereo to mono

hi im new to this so forgiv i run a mibile disco using mp3 on computre comp is stereo out (line out)amp is mono input can the comp be switched to mono some how were 2 chanels sent to one.
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Old 28th November 2010, 05:28 PM   #2
Pano is offline Pano  United States
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Often in your player software there is an option for mono output.
Have you checked for that? You may have to dig deep.
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Old 28th November 2010, 05:47 PM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
if it can't be done in software, then consider using an inverting opamp with two input resistors.

If you set R1in = 20k & R2in = 10k and Rf = 5k.
The output from the opamp will be V1*5k/20k + V2*5k/10k
Set all three resistors to the same value then the output = V1+V2, i.e. loud mono.
Set R1in = R2in = 20k and Rf = 10k, then output = 0.5 * {V1 +V1} = normal mono.
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Old 30th November 2010, 01:11 AM   #4
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Andrew gave you the short version.
For the long drawn-out story see:

Why Not Wye?
Why Not Wye?
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Old 30th November 2010, 01:51 AM   #5
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Quote:
Originally Posted by AndrewT View Post
Hi,
if it can't be done in software, then consider using an inverting opamp with two input resistors.
.
Even simpler is 2 off 1k resistors to mix the channels without shorting them out.
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Old 3rd February 2012, 05:46 AM   #6
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Originally Posted by nigelwright7557 View Post
Even simpler is 2 off 1k resistors to mix the channels without shorting them out.
hi nigel, can you (or someone) please explain how to do that?

thanks!
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Old 3rd February 2012, 07:00 AM   #7
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If you are sure your player hasn't a mono output option (because that is probably the best way to combine the channels), then what you want to do is place a resistor in series with both the left and right channels. Just splice them into each positive lead going to the amp, and connect the two resistor leads closest to the power amp. The resistors isolate the channels from each other while combining the two audio signals into one mono channel.
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Old 3rd February 2012, 07:16 AM   #8
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thanks!

question, do the stereo to mono adapters sold at radio shack contain these resistors? or are they simple Y connectors?

i am getting a lot of noise using the radio shack adapters to drive a mono input from a stereo output. any idea why?

also, don't these resistors cause a volume level drop? and do they really isolate the channels? after all, a resister does not stop a signal, it just weakens it.

also, can these resisters cause some sort of change in impedance?

thanks again!
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Old 3rd February 2012, 07:36 AM   #9
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I do not know if the RS adapters contain resistors. They have worked well enough for me, though, the few times I've used them.
The noise might suggest the RS adapter is a simple Y, without resistors. Otherwise, I haven't a good guess to explain the noise.
If you consider the 1k resistor to be in series with the power amp input, which is likely tens of kilohms, then you see any level drop is fairly insignificant. And the resistors do isolate the channels from each other. "Isolate" in this instance may just mean that one channel doesn't try to drive the other channel.
The resistors will cause a change in impedance. Normally not enough to fuss about. But it is one of many reasons why using an op amp adder/mixer is often the preferred method of combining channels.
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Old 3rd February 2012, 07:44 AM   #10
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Originally Posted by sofaspud View Post
...one of many reasons why using an op amp adder/mixer is often the preferred method of combining channels.
Pray tell, what are the other reasons?

Thnks!
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