4-way Splitter/Mixer Stripboard

[t1redhands]

Hello!

I'm trying to find a good approach to building a 4-way splitter/mixer, and I came across an old post by NoFi:
https://www.diystompboxes.com/smfforum/index.php?topic=39182.0

Here's their schematic: http://thebin.free.fr/schematics/DualSplitterBlend-FINAL.gif

I'm hoping to get some feedback on 1) is this a good schematic? 2) are there other schematics for this? and 3) does this stripboard layout I made come close to being correct?

Here's the image: https://imgur.com/a/yvaDxUr



Thanks so much!

[JerS]

I think you need to define what you are trying to do: splitter? mixer? what are you trying to use it for? With this info - perhaps a more succinct schematic could be provided making it easier to build.

[iainpunk]

welcome to the forum!

there are many ways to skin a cat, and the schematic you show isn't the most ideal solution.
this one is expandable, all channels are the same, it has one inherently clean channel, every bypass adds clean into the mixer so volume keeps constant.
but is otherwise quite similar




cheers

[kizzer]

There's a great 3 way Splitter/Mixer on Tagboard effects, works great.

https://tagboardeffects.blogspot.com/2013/05/opamp-3-channel-splittermixer.html

[t1redhands]

Thanks for the feedback!

The end result I'm aiming for is something like the Old Blood Noise Endeavors Signal Blender.
I'll be using 4 channels - three for parallel effects loops and one clean as the "bypass" channel.
The easy way to do it using existing layouts would be 2x ROG Split n Blend, using individual volume knobs instead of a blend knob, resulting in 4 channels to run into a 4-channel mixer.
But, coming across this schematic from 2005, I thought it might be cleaner/easier to build to use a quad op-amp like a TL074 to handle the split n' buff instead of 4x dual op-amps.
The 3x op-amp splitter/mixer from Tagboard has been marked "on hold," has anyone built it successfully?
I'd also need to add at least one polarity inverter on one channel.

Thanks again!

[kizzer]

I built the Tagboard version and it works great,

[BJM]

There's a simple two-channel splitter/mixer called the Mad Box. You could also build this 2x and replace the two blend pots with four volume pots.  It's a simpler build than the one you've found, less parts and it works. No polarity switch but you could add that to the schematic.

Other alternatives are the GGG IC buffer and GGG/RG Keen's mini mixer. I ended up building the first part of the Mad Box 2x and replacing everything after the returns with the GGG mini mixer. That worked for me.

I.m.o. the biggest problem is finding a good enclosure, with one clean channel and three loops you'll need at least eight jacks and (for live use) four footswitches. That's a lot of tapdancing and using logic and memory IC's is too difficult for me. I did manage to get some "Presets" by not using the footswitches as true bypass but to mute the unused channels, in combination with some rotary switches.

Good luck with it!
https://diy.thcustom.com/shop/madbox-v3-1-pcb/
http://www.generalguitargadgets.com/effects-projects/routers/