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Old 18th January 2009, 09:00 AM   #1
Tribat is offline Tribat  United States
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Lightbulb Hacking a new output to mixer

I just bought the Numark CM200 19" DJ Rack mixer and noticed that there is only one PFL output.
The Headphone jack at the front panel. Now I want to add another PFL line level output to the
backpanel of the mixer. Also the "Cue/Mix/PGM" crossfader meant for the headphone PFL output
should not affect this new output. So only the PFL (Cue) signal will be coming out this new output.

Click the image to open in full size.

So heres the steps I was thinking about:
1. I open the mixer
2. I switch it on and route few channels to the PFL
3. I try to find a spot (with headphones) from the PCB where the mixed PFL signals can be stolen

Am i gonna find a spot like this?

So if there is a spot like that I was thinking of hooking a buffered op-amp amplifier to it.
Then I would drill a few holes to the backpanel for some new RCA connectors and hook the output of the
op-amp circuit to them.

I probably also need to drill a hole for a DC jack so i can power the 4 new op-amps?

So what do you think?
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Old 19th January 2009, 05:14 PM   #2
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I would try to get a schematic, it would be easier. But if not then as you mentionned, it seems logical. But I think you should be able to steal from the mixer's power supply if it uses the same power scheme (bipolar, or unipolar, doubtful they would have done that). good luck!
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Old 20th January 2009, 03:46 AM   #3
Tribat is offline Tribat  United States
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Quote:
Originally posted by gain-wire
I would try to get a schematic, it would be easier. But if not then as you mentionned, it seems logical. But I think you should be able to steal from the mixer's power supply if it uses the same power scheme (bipolar, or unipolar, doubtful they would have done that). good luck!
I don't think they release schematics.

The mixer's PSU looks awfully tiny, I found a picture of it from the Numark replacement parts shop. I don't wanna overload it

Click the image to open in full size.
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Old 20th January 2009, 01:50 PM   #4
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You may find the Cue audio at one end of the Cue/Program fader.
Add a simple Opamp and feed the output of the opamp to a connector on the rear panel.
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Old 20th January 2009, 04:49 PM   #5
Tribat is offline Tribat  United States
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Quote:
Originally posted by Frank Berry
You may find the Cue audio at one end of the Cue/Program fader.
Add a simple Opamp and feed the output of the opamp to a connector on the rear panel.
Yes this is what I'm hoping to find 8)
Is there a reason to use two op-amps? First one to buffer and the second one to amplify the signal to line level?

Does anyone by the way know anyone who has done something similar? I couldn't find anything
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Old 21st January 2009, 08:00 AM   #6
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There is really nothing to be gained by using two Opamps.
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