I talked to Wil about this circuit and got some new feedback. Actually R1 is not really needed, or better, it might create issues with certain MIDI hardware so it's better left away. We could add a jumper to choose between having R1 or not, or one could decide when building the shield (and in case just solder a jumper cable instead of R1).
Also I need to test some bigger caps, to stabilize current in case of a shaky PSU.
193 Feb 2, 2014 3:25 pm
Re: Interest check: MIDI interface for YM_MINI synth (and ANSI vblank?) (32 replies, posted in Other Hardware)
194 Feb 2, 2014 12:21 pm
Re: Interest check: MIDI interface for YM_MINI synth (and ANSI vblank?) (32 replies, posted in Other Hardware)
Cool, even better! I was getting at that, but since you already did an excellent job, I think we can also go with your version 
J2 was which one? I see you've also added a reverse polarity protection diode, good!
Hey if anybody wants to make these PCBs, go ahead, I'd certainly buy one and I have a bunch of people interested over at the Mutable Instruments forums. I'll also volunteer for testing, but my time is a bit limited, so if anybody is bored and wants to join in, I think this could be a nice community project!
I think the next steps should be: test the circuit on breadboard to see if everything works, I'd do that now but I need to get some components first. Anybody has all the needed parts and can breadboard it before I do?
edit: of course, if nobody wants to make the PCBs I'll do!
195 Feb 2, 2014 9:40 am
Re: Interest check: MIDI interface for YM_MINI synth (and ANSI vblank?) (32 replies, posted in Other Hardware)
new version!
To make the PCB smaller I reverted to have panel mount components for the MIDI and PSU plug. I find those components also better for the case design.
The PCB will probably be one-sided, the second layer trace will be replaced by a jumper of course.
Sould I maybe add a reverse polarity protection diode?
196 Feb 2, 2014 8:56 am
Re: Interest check: MIDI interface for YM_MINI synth (and ANSI vblank?) (32 replies, posted in Other Hardware)
Jazzmarazz wrote:
Did you design he PCBs? A quick look tells me it can easily be one sided, to save you yet more money.
Yep I did it. as I said this is just a first rough version, but I agree, one of the next changes will be making it one sided
197 Feb 1, 2014 7:09 pm
Topic: Interest check: MIDI interface for YM_MINI synth (and ANSI vblank?) (32 replies, posted in Other Hardware)
I decided to keep the YM_MINI, since I remembered that I could build a proper DIN MIDI interface for it. I had tried some time ago but failed due to an old firmware, that would not support the baud rate required by MIDI, but this problem has since been solved.
I don't know how many people here on the forum have the YM_MINI, but I would be making PCBs, if anybody wants to join in, we can probably make them for less.
The whole thing is pretty simple and has a relatively low parts count, I'm attaching a quick screenshot of the PCB (still work in progress)
It's very likely that this circuit will work the same for the ANSI vblank (thanks Bleo for pointing me at it). I'll ask Wil from Stray Technologies about it.
198 Jan 31, 2014 10:17 pm
Re: I think i broke my nanoloop cart? (7 replies, posted in Nintendo Handhelds)
Of course you can also get Nanoloop One, that cart supports two additional ROMs (only 32K ones) but since you already have a Nanoloop Two cart I guess that will make little sense
199 Jan 31, 2014 4:33 pm
Re: FS (EU): MTRX-8 midi sequencer, iRig (11 replies, posted in Trading Post)
Toy Guitar SOLD
200 Jan 30, 2014 10:53 pm
Re: FS (EU): MTRX-8 midi sequencer, iRig (11 replies, posted in Trading Post)
Shruthi Programmer SOLD
201 Jan 30, 2014 1:15 pm
Re: FS (EU): MTRX-8 midi sequencer, iRig (11 replies, posted in Trading Post)
LSDJ is SOLD!
202 Jan 29, 2014 5:07 pm
Re: FS (EU): MTRX-8 midi sequencer, iRig (11 replies, posted in Trading Post)
Additional info:
Regarding shipping, for small things (like the LSDJ cart) I can send it as normal registered mail, meaning it would be something around 7€. The other things probably are too big and are better shipped with a parcel service.
If you want to know if you can trust me, I'm sure Bleo can tell you that I'm a totally trustworthy person
203 Jan 29, 2014 7:48 am
Topic: FS (EU): MTRX-8 midi sequencer, iRig (11 replies, posted in Trading Post)
It's time for some spring cleaning so I need to sell some unused kit I have lying around.
Shipping: for boxes up to 1Kg EU shipping is about 20€, for larger quantities it costs me more, but of course the more you spend the more I can give you discount on the shipping.
If you have something to trade let me know, I could be interested... but it depends on what it is.
PM me or leave a comment here.
MTRX-8 midi sequencer
In full working condition, had a brand new USB-MIDI board inside. Used only a couple of time and never left my home. Comes with the SEQ-4 firmware which gives you 4 tracks with 32 steps. It's actually quite cool, but if I get an Octatrack I might not need it anymore
Here's an in-depth video walkthrough of the standard JAM MACHINE interface, a combination of 8 step sequencer, drum pattern sequencer and midi controller.
https://www.youtube.com/watch?v=pWsMaCFogDs
And here's one for the SEQ X4
https://www.youtube.com/watch?v=-F0DYckOsqU
For 160 EUR this can be yours(used to be 250 EUR new)
iRig guitar adapter for iPhone
It's the old "passive" one. I never use it so if anybody wants it 5 EUR and it's yours!
9V AC Power Adapter (1000mA) – good for Mutable Instruments Ambika, but will work for anything else that needs an AC PSU
It's new, bought it but realized I would have needed a DC one. I've bought it at musikding.de.
7€
MTRX-8
iRIG
9VAC PSU
__________________
SOLD STUFF
iRig MIDI
Gibson/Hasbro Power Tour Toy Guitar
Shruthi XT Programmer (Fcd72's version) without the Shruthi
LSDJ cart
Papernoise Neuron
V-Tech ABCMaus
Thomas Henry/Fonik CMOS ADSR
Gieskes VCOFan1B
YM_MINI Synth with DIN Midi and custom case
204 Jan 24, 2014 3:46 pm
Re: [SOLVED] problems uploading ROMs to Nanoloop cart (12 replies, posted in Nintendo Handhelds)
whatever it is, there seems to be a problem between nlmidi and osx.
funny because my experience is that usually audio stuff has more issues with windows...
205 Jan 24, 2014 3:04 pm
Re: [SOLVED] problems uploading ROMs to Nanoloop cart (12 replies, posted in Nintendo Handhelds)
That might be part of the problem indeed! I'm already in contact with Oliver because of this, this might be valuable information, thanks a lot!
206 Jan 24, 2014 2:07 pm
Re: [SOLVED] problems uploading ROMs to Nanoloop cart (12 replies, posted in Nintendo Handhelds)
I was able to solve the problem. It wasn't the cable, it wasn't the adapter, nor was it the Nanoloop cart.
I think the problem is Mac OS or at least Lion.
I dug out an old Windows laptop and did the upload from there. Worked like a charm. Got Nanoloop back onto it + gBA and Shitwave.
Should anybody have problems like mine, try Windows!
207 Jan 24, 2014 11:20 am
Re: [SOLVED] problems uploading ROMs to Nanoloop cart (12 replies, posted in Nintendo Handhelds)
thanks for the feedback. The cable I have is the same as you described. It has both connectors and I was using the old DMG-style one with the MIDI adapter. I was really careful about connecting the cable the right way, i.e. with the rounded parts to the bottom, as described in the manual.
I'm running OSX Lion. I was wondering might Wi-fi be interfering with the data transfer? It might be a cheap poorly shielded cable I got...
208 Jan 24, 2014 10:17 am
Re: [SOLVED] problems uploading ROMs to Nanoloop cart (12 replies, posted in Nintendo Handhelds)
I'll have to try a different link cable. Does anyboby know if the GB Pocket and the Color had the same connector?