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Author Topic: Making a sound mixer  (Read 28409 times)

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Offline Sorunome

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Making a sound mixer
« on: October 14, 2014, 01:51:30 pm »
Yup, i'm making a sound mixer. Most of you probably know already anyways due to chat :P
Also, keoni helped me a lot with it so far.

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Offline Keoni29

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Re: Making a sound mixer
« Reply #1 on: October 14, 2014, 03:23:18 pm »
Looking good :) I see there are 3 pots on there. 2 channels and 1 master I assume?
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Offline Sorunome

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Re: Making a sound mixer
« Reply #2 on: October 14, 2014, 03:23:54 pm »
Quote from: Keoni29 on October 14, 2014, 03:23:18 pm
Looking good :) I see there are 3 pots on there. 2 channels and 1 master I assume?
Yep!
By now there are 4 pots, as i already wired up all but a pot for channel 3.
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Offline TIfanx1999

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Re: Making a sound mixer
« Reply #3 on: October 14, 2014, 04:57:37 pm »
It reminds me of one of Keoni's builds. Looks like some mad scientist stuff going on there. ;D
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Offline Sorunome

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Re: Making a sound mixer
« Reply #4 on: October 15, 2014, 10:45:15 am »
Quote from: Art_of_camelot on October 14, 2014, 04:57:37 pm
It reminds me of one of Keoni's builds. Looks like some mad scientist stuff going on there. ;D

But that isn't much, only some amps, resistors and pottys :P
Anyways, thanks ^.^
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Offline CalebHansberry

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Re: Making a sound mixer
« Reply #5 on: October 15, 2014, 07:51:23 pm »
My brother is into audio electronics, and he was wondering what precisely is it doing to mix the channels? Are the ICs just for amping or something? Also if you have a schematic that'd be cool :D
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Offline ClrDraw

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Re: Making a sound mixer
« Reply #6 on: October 15, 2014, 07:54:52 pm »
This looks really cool (and complicated :P)! Good work :)
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Offline Sorunome

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Re: Making a sound mixer
« Reply #7 on: October 16, 2014, 02:20:20 am »
Quote from: CalebHansberry on October 15, 2014, 07:51:23 pm
My brother is into audio electronics, and he was wondering what precisely is it doing to mix the channels? Are the ICs just for amping or something? Also if you have a schematic that'd be cool :D
the ICs are indeed just amps. The key to mixing the channels is to prevent the input of one "going" into the input of another, you can do that by simply putting in resistors before merging them.
And I have a schematic.....ok, keoni made that schematic :P http://img.ourl.ca/schematic1.png
Quote from: ClrDraw on October 15, 2014, 07:54:52 pm
This looks really cool (and complicated :P)! Good work :)
Thanks!
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Offline Keoni29

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Re: Making a sound mixer
« Reply #8 on: October 16, 2014, 08:20:58 am »
It's basically a bunch of inverting amps with an ajustable resistor in the feedback loop. The outputs of those are then summed by an inverting summing amplifier. The result is all of the channels coming out non-inverted again. (Not that it matters most of the time though.)
The amps make sure there is no crosstalk between channels. I should have made that schematic in CAD software. It looks so ugly
« Last Edit: October 16, 2014, 08:24:14 am by Keoni29 »
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Offline Sorunome

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Re: Making a sound mixer
« Reply #9 on: October 16, 2014, 08:48:22 am »
Haha, but it serves purpose ;)
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Offline DJ Omnimaga

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Re: Making a sound mixer
« Reply #10 on: November 04, 2014, 01:31:31 am »
I completely missed this due to being sick around when this got posted, but it's cool to see you're into sound hardware stuff too. :)
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Offline Sorunome

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Re: Making a sound mixer
« Reply #11 on: November 04, 2014, 06:39:51 am »
Hehe :P
I'm waiting for parts from china.....
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Offline Vogtinator

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Re: Making a sound mixer
« Reply #12 on: November 04, 2014, 09:33:14 am »
You can also do this digitally, without pots, by using some analog multiplexers and digital pots.
I built a preamp consisting of a TDA7439 and TEA6420, it sounds pretty impressive, although it's not complex in any way.
You could easily combine it with some PT2257 and control the whole thing over I²C with a MCU with the added bonus of remote control and you can also save/restore some settings.
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Offline Sorunome

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Re: Making a sound mixer
« Reply #13 on: November 04, 2014, 09:46:24 am »
well i wanted to be able to control that thing without the need of a computer ;)
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Offline Streetwalrus

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Re: Making a sound mixer
« Reply #14 on: November 04, 2014, 10:50:00 am »
That looks pretty cool. Reminds me I have an electronics project to post here as well.
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