Picture of Kaossilator 2 hack: hands free (part 1/2)
This is my first instructable.... ever. So here it goes.

I own a Kaossilator 2 (KO2). It's fun little phrase synthesizer and simple looper. But it has this awkward issue with mic button. When you want to record something from microphone you have to hold down two buttons simultaneously. First the mic button to enable built-in microphone or external input (mic in) and second the loop recording bank button. This isn't an issue until you want to connect another instrument to it and record a loop. While holding down two buttons you have only one hand free to express your self as best as you can.

Imagine that mic enable button is toggle switch. You could enable external input and hold down bank button with your foot and have both hands free. We are now one step closer to our goal. But you still need to put KO2 on the floor, record a loop and then pick it back up. This calls for an foot switch which I'll be making in my second instructable.

Since Korg is reluctant to incorporate mic input toggle functionality in software update this could be solved with a little hardware hack. There are many ways to latch a push button. It can be done with transistor circuit, logic gates, NE555 timer or an microcontroller (MCU) and probably some other ways too. My favorite is MCU since it uses least amount of components and can be soldered directly on KO2s PCB.
ebk11 months ago

hello, this is what i am looking for and I am tired of the rubberband !. I just wonder if there is a simple way, rather than fidling around with programming a chip, cutting the pcb and what not. like replacing the existing button "push on / release off" with a "push on / push off" switch. in my thinking this should work. please confirm and i start looking for a right sized button to exchange : ) thank you.

NaaaF (author)  ebk8 months ago

Hi, Sorry for the late reply. Now I see
how I over complicated this rather banal modification, but I like
working with things that are laying around in my workshop =)

for simpler modification I would suggest buying a latching switch and a
stomp box. Just remove the old switch solder in some wires and connect
to effects pedal box. That's what I did for my effects pedal box with two switches for
loop banks. Details about that are coming soon in part two of this

cesarhc1 year ago
Sorry, for the delay, I did see your answer before!!
Well, the problem I have, using power supply 4,5 Vdclain or AA 3Vdc, sometimes power on, sometimes not power on.
Sometimes all leds are power on, but don't work anything.
I can make a video to explain better if is necessary.
Some ideia?
NaaaF (author)  cesarhc1 year ago
Sorry, can't help you here. I would have to have the unit in my hands to make some measurements. You don't have any warranty on the product? Try some electronics forum. I've seen lots of guys helping out on EEVblog forum: http://www.eevblog.com/forum
cesarhc1 year ago
hello, realy nice your job here!!
I would like to do this on mine, but mine does not work very well, reading yous datasheets, I figure out that the problem Ia have can be fix. Give your idea if is possible.
About LTC3101, nobody can fix here in Brazil, maybe I can do a reset, but I have no experience with that. If you want to share your knowledges, please I would apreciate.
See you
NaaaF (author)  cesarhc1 year ago
If you could describe your problem in a bit more detail and make some measurements around DC-DC converter if you believe that is the source of your KO2s problems maybe someone could help.