Members Notes_Norton Posted March 17, 2019 Members Share Posted March 17, 2019 Looking for a passive way to combine the outputs of 4 synth modules. (Note: I'm posting this in Craig's forum too - you guys know me better, but more people frequent that one). My old Samson MPL1204 Mixers are getting old and cranky (http://www.samsontech.com/samson/products/mixers/mpl-mixers/mpl1204/). I have spares, and repairing them is a bother. I pull one out, send it to the repair shop, put a spare in. It doesn't happen that often, but it's getting more frequent, and I don't want it to fail on the gig. I lost one channel, and I have one unused channel. That was a close call. So something new is in order. There is no small 12 compact mixer that I can find that has 12 true channels. Both the "Alesis MultiMix 12R Rackmount Mixer" and the "Behringer Eurorack Pro RX1202FX Rackmount Mixer with Effects" are really 10 channel mixers with the last two channels stereo. The Behringer looks better because it has balanced outs, but I'll be short one channel with no spare. So I thought of this solution. I have 4 synth modules that take up 4 channels in my mixer. I'd like a passive way to mix the outputs of 4 mono synths (1/4" phone jacks/plugs) to one channel. I don't need volume, eq or anything like that. Just a way to mix them together without creating an impedance mismatch or anything else I may not know about. Someone must make one. I'm searching sites but am having any luck. Perhaps I don't know what it's called. Thanks.Notes Link to comment Share on other sites More sharing options...
Moderators daddymack Posted March 18, 2019 Moderators Share Posted March 18, 2019 Notes, if you want four, you need to buy 6...passive? Yamaha 6 channel mixer: https://www.amazon.com/Yamaha-MG06X-.../dp/B00I2J4V5G Allen and Heath: https://www.allen-heath.com/ahproducts/zed-6/ Alto: https://www.amazon.com/Alto-Professional-ZMX862-6-Channel-Channel/dp/B004TM323C/ref=pd_day0_hl_267_2/133-0480423-1612964?_encoding=UTF8&pd_rd_i=B004TM323C&pd_rd_r= ecbc5dab-4911-11e9-b867-49bec1c8c3ce&pd_rd_w=egc5W&pd_rd_wg=ghm3a&pf_rd_p= ad07871c-e646-4161-82c7-5ed0d4c85b07&pf_rd_r=195M9FPH31BASZ4DATGH&psc=1&re fRID=195M9FPH31BASZ4DATGH Pyle: https://www.amazon.com/Pyle-Professi...ruments&sr=1-8 Link to comment Share on other sites More sharing options...
Members pogo97 Posted March 18, 2019 Members Share Posted March 18, 2019 google "passive summing box" Link to comment Share on other sites More sharing options...
Members Mr.Grumpy Posted March 18, 2019 Members Share Posted March 18, 2019 Rolls stereo passive mixer. Link to comment Share on other sites More sharing options...
Members Notes_Norton Posted March 18, 2019 Author Members Share Posted March 18, 2019 Thanks y'all. Mike Rivers on Craig's corner of this forum and Pogo97 suggested I build one. And gave me the right terms to google. I found a schematic involving 4.7k resistors, jacks, and a project box, so I built one. An afternoon project -- and it even works!!! Problem solved. Thanks again,Notes Link to comment Share on other sites More sharing options...
Members pogo97 Posted March 19, 2019 Members Share Posted March 19, 2019 Isn't it nice when things are easy? Link to comment Share on other sites More sharing options...
Members Notes_Norton Posted March 19, 2019 Author Members Share Posted March 19, 2019 Most definitely! Link to comment Share on other sites More sharing options...
Phil O'Keefe Posted March 27, 2019 Share Posted March 27, 2019 Thanks y'all. Mike Rivers on Craig's corner of this forum and Pogo97 suggested I build one. And gave me the right terms to google. I found a schematic involving 4.7k resistors, jacks, and a project box, so I built one. An afternoon project -- and it even works!!! Problem solved. Thanks again, Notes Nice guys! I'm going to guess the terms they suggested you search for included "DIY," "passive mixer," "resistive mixer," "kit" and / or "schematic," in different combinations... or were there other terms they suggested searching with? I'm glad you were able to make something that meets your needs Notes! Do you have a link to the schematic you used by any chance? Was this your first DIY electronic project? Link to comment Share on other sites More sharing options...
Members Notes_Norton Posted March 27, 2019 Author Members Share Posted March 27, 2019 Not my first DIY music project, I've replaced guitar pickups, and a few other minor things. I had electronics in school and was trained as a Electronics Technician and Cable TV Field Engineer, but that was back in the dark ages when they told us there weren't any jobs in the computer field. The computer at the school took up an entire building and the classrooms had dumb terminals. So I took the 'communications option' and learned about radio frequency stuff after the basics AC/DC theory and labs. But I was a bad boy and decided to play music instead. I've forgotten most of it. No, I don't have the schematic, and I don't remember where I found it. If I had the software I could draw it for you though. I took the "tip" lead of four 1/4" phone jacks wired each in series with a 4.7k resistor and then combined all 4 to the tip lead of an output phone jack. The "ring" (ground) leads are all connected together via the metal case. I used a metal case instead of a plastic project box figuring the completely grounded case would act as a shield to keep noise out of the circuit. If anybody has schematic software it should be easy for them to make one. Link to comment Share on other sites More sharing options...
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