I've not had time to get the PCBs made yet, but here's a more clear schematic for the Vixer Volca Mixer. Not confirmed working (the previous hand-drawn schematic certainly does), but I've tripled checked it, so fingers crossed it should do. Will confirm once the PCBs are made up, or let me know if you make it Just right click and save. Enjoy & have happy new year!
This has taken FAR longer than expected to complete, but finally the prototype of the Volca Mixer is ready. I've settled on the following features; 3 Inputs Aux effects send/return, with each channel having an amount pot, plus an overall amount pot Switchable Global Delay Switchable Headphone Amp The mixer has the ability to run without batteries (bypassing Delay and Amp) Here's a quick video of it in action;
Make a small mixer for use with things like the Korg Volcas and other tiny synths. I wanted something I could just grab and use on the sofa with minimal hassle setting up. Ideally it should contain;
Spec
A compact mixer with between 3 to 6 inputs Fits in a 1590BB guitar pedal enclosure Possible Effects section Not be too expensive Keep reading to see the prototypes...
This is a really cool build; It a recreation of the Korg Mini-Pops drum machine, an instrument which has been on a ton of records the most famous of which might be Jean Michelle Jarre’s ‘Oxegen’ album, hence this clone being called the ’O2’.
The brilliant Jan Ostman built this using only an Arduino nano and a few barebone parts. Jan is giving away the full details on his website and is only asking for a $3 donation in return. Bargain!
If the linked website is no longer working, use the Internet Archive to visit a cached version of the site (copy and paste the address and choose a date from around when this pages was posted: around Dec 2016).
***MIDI update***
From the forums of Look Mum No Computer, somebody has posted the code but with the MIDI update;
If you'd like to build a more advanced version, head over to the NoiseyMaker website for more info and a nice detailed guide. This version builds on the original & adds some advanced features like a display and even pitch control of the samples. Also the drum patterns have been updated to be a bit more 4/4 time 'electronic-style', rather than than some of the 3/4 time waltz in the original code (you could always copy & paste these over to the old code if you wished).
....
I started by building my first version using a cheap Maplin plastic enclosure, but I thought it was worth spending a little more time on it so I got the table saw out.
Because the table saw has a maximum cutting width of 7cm, I based the case around this limitation.
The switches mute the individual drum hits. The pots select the pattern and its tempo.
V3.
***UPDATE Arduino Drum Machine****
Simplified Schematic
Ok, so this 'simplified' schematic might not actually make things any simpler! But some people have asked for it, so maybe it'll help clear somethings up a little bit - especially how to wire up the audio output and pots/switches. This was drawn from memory so I hope it's correct - give me a shout if not and I'll update (the pots might work in reverse, but they'll still work). I'd also urge you to look at the schematic on Jan Ostman's website for more help;
