Almost ready to ship to its destination. It seems promising !


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the joy of prototyping

I haven’t posted much recently. The heat is actually killer.

I’m currently involved in an interesting project.


For obvious reasons I can’t talk much about it, and  I’ll offer only vague pictures of it. This is the pure prototype of the project. Boards will be connected via ribbon cables (way more efficient to work with, each board can be tested and debugged independently).

The all thing will be controlled by the microcontroller (at the moment the trusty atmega 328P and NO ****** arduino). Although the code size is rather small it isn’t impossible that we’ll use something cheaper and smaller (I’d like to use an ARM processor but for such limited thing, won’t it be a waste of power ?) .

More Pictures will come I guess.



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From the depths

Some followers may remember this project of mine. A sequencer with any sort of knob and control.


It turns out that the fewer controls you have on you machine, the less fun you get. REALLY! It haven’t been used for many times for this reason. Those are things you can only figure out once the machine is built and your idea concrete. It is even truer for musical instruments that must remain fun and headache free with a very well thought interface.

However, the machine uses MIDI input and I decide to not trash it but to re-write the firmware to give all controls over midi. The machine will gain a maxiumun of controls and, I hope, more fun.

there’re some very cheap MIDI controllers (the beringher BR something) that cost less than a hundred euros.

I’m also thinking about making a module with the idea. It may be an interesting solution to not having a massive HP hungry module.

The hardware also could make use of a good revision (it’s horrible now that I think about it).

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Skype Microphone


I needed a microphone for Skype (that sotfware reminds me of the old MSN messenger before old that “social media” crap).

I wasn’t willing to buy a microphone (this show how cheap I am). I found an old electret microphone in my junk box. I wired it to a simple op-amp gain stage and got a microphone.

This is where you realise that all those nerdy hours of reading stuff finally pay off.

And hot glue really helps also…

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biscuit on his way

the synthi biscuit is finished and is for sell :

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June 9, 2016 · 1:42 pm

To sail through space…

The set of modules is almost complete, I’ve just received the front panel and I’m quite pleased with them.


However, I’m not satisfied with those knobs (not that great) I’ll order new ones which may look better.

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A simple circuit to produce random gates output. The 555 timer control the time at which the output is giving random gates (or random pulse width square wave I should say). The all circuit is quite self-explanatory I think. The pot. associated with the comparator isn’t very necessary but add some wellcomed variations.

It isn’t mentioned but the random noise coming to the comparated must be massively filtered (at least under 5Hz). Ideally a varaible filter could also be nice addition (although its span has to be large to get a decent scale).

R41/R43 form a voltage divider to output (about) a 10V high level. Maybe 12V is deadly enough for some module’s input.

The circuit works good and will be added to a coming “noise oriented” module.

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Mikrophonie layout

Just out of boredom I made a SMD version of the Musicthing’s Mikrophonie project. I don’t know if it will ever be produce. But I put the layout and gerber files available.mikro

Gerber files :


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The first module has been built and tortured all the possible ways. It survived.

the front panel are about to be ordered, so for those who could be interested here’s the manual for the module (bear in my mind it’s only the draft, so things will be added and removed):


a soundclip, others will be made and added :



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