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Old 4th February 2013, 02:13 PM   #1
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Default How can I split a mixer bus?

Here's what I'm working with

3 Stereo Input Channels

1 Stereo Master Output

1 Stereo Headphone Output

Originally, all 3 channels are wired to a bus that feeds Main Output circuit and Headphone Output circuit simultaneously.

I want to modify the circuit so Channel #3 feeds Master Output but NOT Headphone Output.

I'm trying a configuration with switches but in the end, Channel #3 signal reaches Headphone Output through Master Output bus->Channel #1 path->Headphone Output.

I'm trying to be as clear as possible. I have a schematic but it's a pdf.
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Old 5th February 2013, 07:27 AM   #2
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You will have to connect headphone input to the mix of ch1 and2 and then feed ch3 to the master.

I don't know how useful is my suggestion.

Gajanan Phadte
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Old 5th February 2013, 11:59 AM   #3
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Yes, that's what I'm trying to do. Are you suggesting I make a mix of 1 and 2 through a buffer and feed the buffer output to Master input where I add channel #3 ? Would that block signal from channel #3 to reach channel 1 and 2 path (to headphones)?

If that makes any sense...
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Old 5th February 2013, 12:09 PM   #4
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You can use Adobe Reader to Take a Snapshot (from the Edit pulldown menu) to save as a graphic file. Or use Ghostscript to save the page as a graphic file.
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Old 5th February 2013, 12:47 PM   #5
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Old 5th February 2013, 10:06 PM   #6
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Your post #3 is the only answer I'm aware of. 1 and 2 go to the Headphone Out and to a buffer. 3 gets added after the buffer and 1-2-3 go to Master Out.
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Old 6th February 2013, 01:15 PM   #7
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The idea behind this is to use Headphone Output as an Aux Send for channels 1-2 and use channel 3 as a Return.
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Old 11th February 2013, 12:47 PM   #8
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I know this is ultra basic stuff but I haven't use op amps in awhile and I must make sure I get it right.

I will use the same 4560 as the original design. The only thing I'm not sure is should I use an input resistor (like figure B) and which value to keep everything flowing properly?

FYI, the buffer will be connected between Channels ouput (Ch.1 = R5 for Right and R10 for Left) and Master input (R40 for Right and R37 for Left). See schematic I posted before.

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Old 11th February 2013, 06:52 PM   #9
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Here's the modified schematic. Now I've having a hard time figuring out if the op amp buffers need bias resistors, in/out capacitors, etc.
All I want is a 1/1 reproduction of the signal. No amplification.

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Old 11th February 2013, 07:08 PM   #10
cbdb is offline cbdb  Canada
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you dont need the extra buffers, the summing amps are all you need, you just have to rewire the inputs to the summing amps, omitting channel 3 from the head phone amp. Are you sure the section wth the discrete transistors is not the HP amp?
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