Author Topic: Boxing up the Loneoceans' midi2 controller  (Read 2297 times)

Offline Mads Barnkob

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Boxing up the Loneoceans' midi2 controller
« on: August 20, 2017, 09:32:01 PM »
Long ago I bought one of Gao/Loneoceans' midi2 controllers: http://loneoceans.com/labs/sales/midi2/

I finally dug it out from the pile of kits-to-build-when-I-get-time(tm) and found a suitable aluminium box to house it in.

It has two outputs for optical transmitters, so I wanted to put one of each kind in for each channel, so it will have both a blue IF plastic fiber transmitter (IF-E97) as well as the ST Fiber transmitters (OPF1414T). I will make a separate PCB for these 4 to be mounted in the side of the box.

For the front I wanted to make a simple etched PCB for text, markings etc. It was easy and fast to make in ExpressPCB.

So far I got to etch the front and prepare all the potentiometers and switches with wires



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Offline Mads Barnkob

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Re: Boxing up the Loneoceans' midi2 controller
« Reply #1 on: August 22, 2017, 07:12:15 AM »
All potentiometers, switches and push buttons have been mounted in the lid with front plate on. I had the front plate mounted on the lid with the 6 screws when I did all the holes through both front plate and lid at the same time, to ensure perfect alignment, but I fooled myself. As the lid was not mounted on the box, the 6 lid screws was not in center and I will properly break a few of the corners when mounting the lid, since the screws come in off center :(

If anyone else ever build one of these, be sure to notice that the connection points for PW, Frequency and SW are mirrored (channel 1/2), but the optical output connections are not mirrored, so it is easy to mix up the turn direction of the potentiometers and that midi/fixed switch works opposite.

Next job to be done is making a small PCB for the 4 optical transmitters, a small front plate and drill the holes for those and the MIDI connector in the case.
« Last Edit: August 22, 2017, 08:39:12 AM by Mads Barnkob »
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Offline futurist

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Re: Boxing up the Loneoceans' midi2 controller
« Reply #2 on: August 22, 2017, 07:30:04 PM »
Looks quite nice so far! Are you planning to coat PCB to prevent copper oxidation?

I'm also thinking about purchasing his controller, looking forward to see live test

Offline oneKone

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Re: Boxing up the Loneoceans' midi2 controller
« Reply #3 on: August 23, 2017, 06:14:29 AM »
That's turning out mint! The front plate looks clean as. I'm looking forward to see the end result

Offline Mads Barnkob

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Re: Boxing up the Loneoceans' midi2 controller
« Reply #4 on: August 23, 2017, 07:20:53 PM »
I thought about coating it, but the clean copper is just too shiny, so you have to see it at the right angle against the light to read the text, so I will left it oxidise and brown up by itself, I tried baking soda so speed the process, but that did not really give anything, most likely because the baking powder that I had was != baking soda  ::)

I finished up the optical board and plate for that, unfortunately the box was too thick-walled for the two ST Fiber transmitters to hold the plate in place, so it need some bigger holes and two screws.

Then I searched the house for a 9V battery, found none and went to bed. Ill find a 9V battery and will either rig up a small DRSSTC or make a simulator, properly the latter since being very noisy with a DRSSTC after daughter is put to bed is a no-go.
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Offline Mads Barnkob

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Re: Boxing up the Loneoceans' midi2 controller
« Reply #5 on: August 28, 2017, 03:37:05 PM »
I checked out the fixed mode with my oscilloscope and it was dead on 10 - 360 uS on-time for the maximum setting on the SMD potentiometer and also the freqeuncy from 100 to 300 Hz was perfect, nothing to point fingers at there.

I played 4 MIDI tracks and its a little varying on how much on-time is needed to play all the notes, I played mostly 2-4 notes at a time here and I think the on-time was around 100 uS for a 300 kHz coil. The primary coil, IGBT heat sink and secondary coil was warm to the touch after a 1 minute play time :)

Recorded with a 5Dmk3 and a H2n zoom external microphone, no sound clipping!

Ievan Polkka played on Mini Tesla coil - Kaizer DRSSTC II
/>
The Imperial March played on Mini Tesla coil - Kaizer DRSSTC II
/>
Dance of the Sugar Plum Fairy played on Mini Tesla coil - Kaizer DRSSTC II
/>
Scooter - Friends played on Mini Tesla coil - Kaizer DRSSTC II
« Last Edit: August 28, 2017, 06:17:30 PM by Mads Barnkob »
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Re: Boxing up the Loneoceans' midi2 controller
« Reply #5 on: August 28, 2017, 03:37:05 PM »

 


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