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Made a quickie 2-channel guitar mixer at the weekend

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  • Made a quickie 2-channel guitar mixer at the weekend

    I made this over the weekend. It's a two-channel passive mixer.



    Parts required:

    - 1x enclosure
    - 3x 1/4" sockets
    - 2x 10k log pots
    - 2x knobs
    - 2x 10k resistors
    - some wire

    Schematic...




    Here's a photo of the guts (not that there ARE many).




    This one won't get a snazzy paint job, since it's for a friend (in exchange for a bottle of Baileys), so it's just going to get the Dymo
    --------------------------------------------------------------------------------------------------

    My guitar projects: http://diystrat.blogspot.com

  • #2
    hmm thats a good idea... thanks for the schematic

    Comment


    • #3
      I made this over the weekend. It's a two-channel passive mixer.



      Parts required:

      - 1x enclosure
      - 3x 1/4" sockets
      - 2x 10k log pots
      - 2x knobs
      - 2x 10k resistors
      - some wire

      Schematic...




      Here's a photo of the guts (not that there ARE many).




      This one won't get a snazzy paint job, since it's for a friend (in exchange for a bottle of Baileys), so it's just going to get the Dymo

      "You´╗┐ people keep on raining. I'll still be the parade." - Diamond Dave.



      TO HEAR MY COUNTRY BAND: ADRIAN RAY, click THIS or this


      Official endorsee of:Breedlove Guitars

      http://www.ghsstrings.com

      http://www.rocktron.com

      http://www.monsterenergy.com/

      Myspace.com-Dave Aronow

      Comment


      • #4
        The schematic link isn't working. I checked the main page to see if their site is down but it is working, so maybe the pic was removed?

        {edit}

        Where did you buy the enclosure? All the ones I'm seeing are over $8. I don't think I could buy all the other parts you used for under $8 total.

        Comment


        • #5
          The schematic link isn't working. I checked the main page to see if their site is down but it is working, so maybe the pic was removed?

          {edit}

          Where did you buy the enclosure? All the ones I'm seeing are over $8. I don't think I could buy all the other parts you used for under $8 total.


          Which link? You mean diystrat.blogspot.com?

          I'm living in Taiwan and managed to find those boxes for about 5 US bucks each. They're not Canadian-made Hammonds or anything, but they do the job. The component parts cost pennies. You could of course box it in something else, even a tin can or something. There's no stomp switch, so the box doesn't even need to be very strong.

          EDIT: Oh yeah, something IS screwy. It's the image itself though. Let me try and sort that out.

          EDIT 2: Hey can you try now, katillac? Might need to hit refresh or something. This is the blog entry I originally made that schematic for, btw: http://diystrat.blogspot.com/2008/08/two-channel-mini-mixer.html . Just used an "el cheapo" plastic enclosure with a metal bottom that time.
          --------------------------------------------------------------------------------------------------

          My guitar projects: http://diystrat.blogspot.com

          Comment


          • #6
            10K grounded pots? Major signal loss.

            With a passive box thay should match or be higher than guitar pots. 2 in parralel maybe even doubble like 500Ks for single coils, 1 meg for HBs.

            You can also wire them like a rickenbacker guitar with a floating ground on one leg so the signal doesnt drain to ground.

            Comment


            • #7
              Those 10K pots are going to load down passive pickups an awful lot. Unless whatever is running into that box is active (pickups or effects), the volume is going to be pretty low.

              Comment


              • #8
                10K grounded pots? Major signal loss.

                With a passive box thay should match or be higher than guitar pots. 2 in parralel maybe even doubble like 500Ks for single coils, 1 meg for HBs.

                You can also wire them like a rickenbacker guitar with a floating ground on one leg so the signal doesnt drain to ground.


                I really haven't noticed much signal loss, but I'll do a test with and without it. Like I said though, I'm using it with a practise amp at home, rather than for anything of importance and it seems to work well for that.

                I'd like to make it better if that's possible of course, so thanks for the advice. If I bump the pots up to, say, 1M each, what would you recommend for the resistors?
                --------------------------------------------------------------------------------------------------

                My guitar projects: http://diystrat.blogspot.com

                Comment


                • #9
                  500K pots should do the job and retain a linear turn on the knobs. If you use a strat you can try 300 or 250k, but remember the guitar has one in it as well so the signal is actually seeing the cummulative effect of both the guitar and the pots in the box. 2 X 250K will equal 125K. If you have a 500K in the guitar and a 1 meg in the box it it will only bring it down to 325K or so which should still be good. a 1 meg with a 250K may only bring it down 50 ohms.


                  The 10K resistors are in line with the signal, they will drop the signal as well. You can try it with them in there, Try jumping them out and see what the difference is with a signals passing. You can try doing without them if theres a great loss, or you can try like a 1 or 2mf cap instead. The caps would isolate any DC signal, while passing the usable signal. this might be useful when running foot pedals in. You can also put the caps in parallel with the resistors and try that. You'll get more signal through. The higher the capacitence the more bass will pass, but unless isolation is needed, go with the Caps only existing resistors with caps, or straight jumpers and let the pots do the job of separation.

                  Comment


                  • #10
                    500K pots should do the job and retain a linear turn on the knobs. If you use a strat you can try 300 or 250k, but remember the guitar has one in it as well so the signal is actually seeing the cummulative effect of both the guitar and the pots in the box. 2 X 250K will equal 125K. If you have a 500K in the guitar and a 1 meg in the box it it will only bring it down to 325K or so which should still be good. a 1 meg with a 250K may only bring it down 50 ohms.


                    The 10K resistors are in line with the signal, they will drop the signal as well. You can try it with them in there, Try jumping them out and see what the difference is with a signals passing. You can try doing without them if theres a great loss, or you can try like a 1 or 2mf cap instead. The caps would isolate any DC signal, while passing the usable signal. this might be useful when running foot pedals in. You can also put the caps in parallel with the resistors and try that. You'll get more signal through. The higher the capacitence the more bass will pass, but unless isolation is needed, go with the Caps only existing resistors with caps, or straight jumpers and let the pots do the job of separation.


                    Thanks WRGKMC,
                    That's some really useful information.
                    Cheers.
                    --------------------------------------------------------------------------------------------------

                    My guitar projects: http://diystrat.blogspot.com

                    Comment


                    • #11
                      I'm living in Taiwan and managed to find those boxes for about 5 US bucks each. They're not Canadian-made Hammonds or anything, but they do the job.

                      Oh heck yeah! Recycled aluminum FTW! That's one thing on the list of many things I miss about Taiwan. The last pictures I saw (taken about 5 years ago) of where I once lived in Tien Mou made me a bit sad and melancholy. The area where our house was is now all high-rise apartments and I can't even imagine how Taipei of today compares to when I lived there. Even then, as a kid, I enjoyed the bargain shopping, but these days... oh my goodness, I'd have to really watch my budget. One stop I know I'd like to make is further south to visit where that one guy (Antonio Tsai I think is his name) has the big shop that does custom guitar work and really cool inlay stuff. I think he's in Tainan.

                      The blog link works fine now =)

                      Comment


                      • #12


                        Where did you buy the enclosure? All the ones I'm seeing are over $8. I don't think I could buy all the other parts you used for under $8 total.


                        You can get the cost WAY below $8. For example the "best" enclosure is an Altoid's mint tin. Buy it for a buck and you get some mint candy too. Skip the jacks. Use a 1/4 inch phono plug splitter cable. it will have three ends. Cut them off. Resisters cost only a few cents. You don't need pots and knobs, guitars have their own volume controls. Likely you can build a passive mixer with junk you have already.

                        I needed one of these so I could use a metronome with headphones. I wanted to hear both the amp's headphone output and the metronome's headphone output at the same time.

                        Comment


                        • #13
                          Electronics goldmine has nice cermet Bourns 5M dual pots (item #G13526) for $2, jumper with whatever to get lower R values, wire each jack opposite and you have a 1 knob balance pot...

                          Comment


                          • #14
                            You can get the cost WAY below $8. For example the "best" enclosure is an Altoid's mint tin.

                            That's fine for fartin' around with at home, but they're not good for travel and you can't turn the knobs with a foot very easily without denting the tin. I have a big boxful of Altoids and Jones Soda candy tins for projects. Makes 'em smell wonderful hehe

                            Comment


                            • #15
                              heres an Idea that I'm thinking of and perhaps will make.

                              take this same design but add FX loops to each channel so you can mix two different guitar FXs without haveing them go into eachother.

                              with that set up you could run a POG and Hog at the same time or in my case a POG and a Boss OC-2 at the same time
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