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MusicMiK uploaded a new video
(1 week ago)
Here, i show you how to update the MIDItriggs firmware if you use the MIDIboot loader in your MCU, which is an ATmega88 in my unit.
Besides this, i ...
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Here, i show you how to update the MIDItriggs firmware if you use the MIDIboot loader in your MCU, which is an ATmega88 in my unit.
Besides this, i show you how the configuration of MIDItriggs works with just one button for the input (and MIDI events to set MIDI channel and the mappings of instruments), while for the feedback, the sound generators in the beatbox are used to give simple patterns telling you the current state of the configuration items.
The source code, schematics and documentation are public now, you can find everything about the project here: http://www.mik-music.org/MIDItriggs
Soon, a new version with completed documentation and PCB layout will follow, the project will grow as i find other units i can attach this nice toy to. The hardware might need changes for some other units, like the Roland CR-78, which also would be an interesting candidate for this, i just don't have one currently, so this has to wait a bit.
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MusicMiK uploaded a new video
(1 week ago)
This is the demonstration of my current small project called MIDItriggs, an universal, open-source MIDI to/from trigger interface for old analog be...
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This is the demonstration of my current small project called MIDItriggs, an universal, open-source MIDI to/from trigger interface for old analog beatboxes and drum machines.
This video demonstrates the clock output feature, which is just added "because we can" :)
You can synchronize and control MIDI sequencers using the built-in sequencer of your beatbox, in the case of the Hohner Automatic Rhythm Player, this is some TTL logic with a diode matrix.
Of course, you can also send the machine trigger signals as MIDI notes, but in this video, they are filtered, just the start/stop/clock messages are sent to the RM1x.
The project will be published with source code, schematics and documentation this weekend.
The firmware is smaller than 4 kilobytes and uses less than 512 bytes of RAM, so it can be used on an ATmega48, while using an ATmega88 or larger can even give you boot loader capabilities to update the firmware over MIDI. The MIDIboot boot loader for this is already published.
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MusicMiK uploaded a new video
(2 months ago)
Started to fix my Hohner Automatic Rhythm Player i got a while ago. All the PCB retainers fouled away to an undefined strange soft chewing-gum like...
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Started to fix my Hohner Automatic Rhythm Player i got a while ago. All the PCB retainers fouled away to an undefined strange soft chewing-gum like matter, so they need replacement in the near future. Currently, i added some provisoric stuff to keep the boards in place and make the box usable.
During the repair (that this video should handle), i decided to add MIDI to it, so this video now is the story about developing and making a small MIDI retrofit for this nice machine.
It currently works in a very primitive way - after investing just about one day of work into it. The firmware will be enhanced to add the following features:
- Using the configuration button to enable a learn mode to set the MIDI channel and assign instruments to the MIDI notes (while multiple notes can trigger the same instrument) and set other things. Input devices are MIDI note events and the green button i added at the rear, output devices are the instruments to give some feedback by playing sounds.
- Implement the blocking of MIDI triggering when the internal sequencer runs, even if the hardware doesn't care about concurrent triggering, nothing can be damaged due to the diode matrix and my way of triggering the instruments being friendly to each other.
- Implement MIDI out for the internal diode matrix sequencer, including MIDI clock and start/stop, which should be possible with the current hardware. MIDI note assignment also takes place in the configuration then. Not too useful, just "because we can" :) The output might also be available as software MIDI thru, using filtering.
- Maybe add some means of accentuation, which this machine is currently missing, but i have some port pins available which should make this possible.
Another useful modification would be separate outputs for all instruments, i'm thinking about this but will do this a bit later. First, the unit needs some restoration after this quick idea of the MIDI input. With this, it really makes some serious sense in the studio as i no longer need to use the preset rhythms.
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MusicMiK uploaded a new video
(2 months ago)
Seen as a repair, this was a failure. But i think, it could be of interest anyway.
Now this happens if you try to repair phantom problems. If you us...
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Seen as a repair, this was a failure. But i think, it could be of interest anyway.
Now this happens if you try to repair phantom problems. If you use both ring modulators on the Synthex, especially in conjunction with oscillator synchronization, you can get very strange sounds that sound like a defect of a voice. This is strengthened by the fact that when playing through the notes, it likes to happen on the same voice(s) all the time.
I measured around in the voice boards for hours and looked for differences between 2 voices, the only assumption was that the analog control of the 4070s used for waveform inversion are the problem - aging might lead to the problems. And i also suspected such aging factors in some analog switches. Couldn't prove this by measurement, so i could just replace all chips in doubt.
Fascinating enough, the problem was nearly gone after this - same test procedure. So i did the replacement in 2 other voices. But the next test procedure showed the same defects on one of the repaired voices. Evil stuff. Diving deeper into this just led me to the conclusion that this is the little bit of analog behaviour in the digital oscillators of the Synthex. It's not a bug, it's a feature.
Don't try to repair this. There is nothing to repair. And if you already did - don't take it too serious. I wasted a lot of time on this, but not everything in life, and especially in electronics DIY, can lead to success.
At least i hope you have some fun with the strange behaviour with this special sound configuration.
If you have a Synthex, please try around with this and tell me the results - as comments on this video or so. Would be interesting if this is reproducible on other units also.
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MusicMiK uploaded a new video
(2 months ago)
Another story for the DIYers among us.
Today, i repaired the joystick of an Elka Synthex. This was a bit more complicated, as the joystick is revete...
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Another story for the DIYers among us.
Today, i repaired the joystick of an Elka Synthex. This was a bit more complicated, as the joystick is reveted together, so i needed to modify the mechanics a bit to use screws to put it back together.
This took the whole morning, and i didnt see much i could cut out of the videos i took over this period, so this is another multipart video series.
The main cleaning procedure is the same i use on potentiometers having major trouble, this part is quite simple.
All in all, this is another video showing that even hopeless damage (im sorry i didnt take videos of the condition of the synthex with this joystick before i started the repair) is no killer for unobtainable parts if you invest enough patience to get them back to life.
Part 1 shows how to take it apart and prepare it for using screws to put it together later
Part 2 is some mechanical work for the screws and cleaning the potentiometers
Part 3 shows how to put the thing together and test it
Hope anyone else with similar problems can use it as a motivation to try to repair it. The joystick was in a condition where i couldnt lose anything, it was completely unusable, i had the choice between further damaging it so its just left there as decoration or to get it fixed - which was successful.
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I just want to tell you that I am starting a new account for my music and electronic projects.
Panzerkanone44 already has some game clips and the name is not appropriate for my electronic projects :)
So it will only be used for games and stuff like that.
My new account is called "Synthpeter" and will probably be more interesting to you.
I'd be honored if you would subscribe to it instead (or as well heh).
Best regards,
Peter
I really enjoyed watching your clips. When watching your series about the small stone phaser I wanted to build one too but when I was half-way through the series I realized all the work that you have to go through. And, considering I have my own insane project (matrix 1000 editor) I guess I should just try to focus on that instead ;)
Cheers!
/Peter
Um einen Oszillator mit mehreren Wellenformen zu realisieren, braucht es ein wenig mehr Aufwand als einen 555. Üblicherweise gibt es genau einen Oszillator, der genau eine Wellenform produziert, die anderen Wellenformen werden dann über Waveshaper davon abgeleitet. Die gängigen Wellenformen lassen sich am Besten aus einem Sägezahn ableiten, daher ist auch fast jeder Synthesizer-VCO ein Sägezahnoszillator.
Ich arbeite auf meiner Homepage gerade an einer Dokumentation, die all dies beschreiben wird, aber das dauert alles noch etwas, bis es da das "Synthesizer-Entwicklungs-HowT
Bis dahin gibts aber für den MiK-one und den MonoMiK Schaltpläne zum Studium.
ich habe eine Frage....ich habe einen VCO auf dem 555 timer aufgebaut...wie kann ich jetzt aus dem Signal Sinus-, Square oder Trangle Wellen machen? ...Welche IC brauche ich dafür?
Danke
Jevgenij