Author Topic: Making a sound mixer  (Read 26906 times)

0 Members and 1 Guest are viewing this topic.

Offline Sorunome

  • Fox Fox Fox Fox Fox Fox Fox!
  • Support Staff
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 7920
  • Rating: +374/-13
  • Derpy Hooves
    • View Profile
    • My website! (You might lose the game)
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.


THE GAME
Also, check out my website
If OmnomIRC is screwed up, blame me!
Click here to give me an internet!

Offline Keoni29

  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2466
  • Rating: +291/-16
    • View Profile
    • My electronics projects at 8times8
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?
If you like my work: why not give me an internet?








Offline Sorunome

  • Fox Fox Fox Fox Fox Fox Fox!
  • Support Staff
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 7920
  • Rating: +374/-13
  • Derpy Hooves
    • View Profile
    • My website! (You might lose the game)
Re: Making a sound mixer
« Reply #2 on: October 14, 2014, 03:23:54 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.

THE GAME
Also, check out my website
If OmnomIRC is screwed up, blame me!
Click here to give me an internet!

Offline TIfanx1999

  • ಠ_ಠ ( ͡° ͜ʖ ͡°)
  • CoT Emeritus
  • LV13 Extreme Addict (Next: 9001)
  • *
  • Posts: 6173
  • Rating: +191/-9
    • View Profile
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

Offline Sorunome

  • Fox Fox Fox Fox Fox Fox Fox!
  • Support Staff
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 7920
  • Rating: +374/-13
  • Derpy Hooves
    • View Profile
    • My website! (You might lose the game)
Re: Making a sound mixer
« Reply #4 on: October 15, 2014, 10:45:15 am »
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 ^.^

THE GAME
Also, check out my website
If OmnomIRC is screwed up, blame me!
Click here to give me an internet!

Offline CalebHansberry

  • LV4 Regular (Next: 200)
  • ****
  • Posts: 135
  • Rating: +14/-0
  • This is my personal text
    • View Profile
    • Skylites Computers
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
You should know, I am a Christian.

Offline ClrDraw

  • LV7 Elite (Next: 700)
  • *******
  • Posts: 627
  • Rating: +61/-2
    • View Profile
    • GitHub
Re: Making a sound mixer
« Reply #6 on: October 15, 2014, 07:54:52 pm »
This looks really cool (and complicated :P)! Good work :)
Visit my GitHub for all my TI programs as well as other projects.
Also check out my website.

Offline Sorunome

  • Fox Fox Fox Fox Fox Fox Fox!
  • Support Staff
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 7920
  • Rating: +374/-13
  • Derpy Hooves
    • View Profile
    • My website! (You might lose the game)
Re: Making a sound mixer
« Reply #7 on: October 16, 2014, 02:20:20 am »
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
This looks really cool (and complicated :P)! Good work :)
Thanks!

THE GAME
Also, check out my website
If OmnomIRC is screwed up, blame me!
Click here to give me an internet!

Offline Keoni29

  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2466
  • Rating: +291/-16
    • View Profile
    • My electronics projects at 8times8
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 »
If you like my work: why not give me an internet?








Offline Sorunome

  • Fox Fox Fox Fox Fox Fox Fox!
  • Support Staff
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 7920
  • Rating: +374/-13
  • Derpy Hooves
    • View Profile
    • My website! (You might lose the game)
Re: Making a sound mixer
« Reply #9 on: October 16, 2014, 08:48:22 am »
Haha, but it serves purpose ;)

THE GAME
Also, check out my website
If OmnomIRC is screwed up, blame me!
Click here to give me an internet!

Offline DJ Omnimaga

  • Clacualters are teh gr33t
  • CoT Emeritus
  • LV15 Omnimagician (Next: --)
  • *
  • Posts: 55942
  • Rating: +3154/-232
  • CodeWalrus founder & retired Omnimaga founder
    • View Profile
    • Dream of Omnimaga Music
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. :)

Offline Sorunome

  • Fox Fox Fox Fox Fox Fox Fox!
  • Support Staff
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 7920
  • Rating: +374/-13
  • Derpy Hooves
    • View Profile
    • My website! (You might lose the game)
Re: Making a sound mixer
« Reply #11 on: November 04, 2014, 06:39:51 am »
Hehe :P
I'm waiting for parts from china.....

THE GAME
Also, check out my website
If OmnomIRC is screwed up, blame me!
Click here to give me an internet!

Offline Vogtinator

  • LV9 Veteran (Next: 1337)
  • *********
  • Posts: 1193
  • Rating: +108/-5
  • Instruction counter
    • View Profile
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.

Offline Sorunome

  • Fox Fox Fox Fox Fox Fox Fox!
  • Support Staff
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 7920
  • Rating: +374/-13
  • Derpy Hooves
    • View Profile
    • My website! (You might lose the game)
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 ;)

THE GAME
Also, check out my website
If OmnomIRC is screwed up, blame me!
Click here to give me an internet!

Offline Streetwalrus

  • LV12 Extreme Poster (Next: 5000)
  • ************
  • Posts: 3821
  • Rating: +80/-8
    • View Profile
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.