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Everything else / Re: Post your songs!
« Last post by ToyKeeper on November 20, 2018, 03:41:55 AM »
I made another thing.  Just a quick sketch, really, but it's a NES-styled 8-bit tune so it's kind of relevant.

I mostly made it to get the idea written down, so I can go back and finish it later.  But then the Smash Ultimate trailer came out, so I tried their thing with my thing...  and it fits!

Nothing fancy, no effects -- just square waves, some vibrato, and drums.  I find I really like prototyping songs that way.  It keeps the emphasis on melodic composition instead of patch design, and a square wave has a rich set of harmonics so I can really hear which notes fit together and which don't.
Software technical support / Free PCB Design Software
« Last post by ALLPCB on October 24, 2018, 03:25:16 AM »
Free PCB CAD Software

This is a comparison of printed circuit board design software. Our criteria for including a PCB CAD program are:

There should be a version available for free (no money).
The free version should not be time limited, i.e. you should be able to use the software indefinitely without needing to pay for it.
The free version should provide schematic and board design and should generate some form of output that can be used to manufacture boards.
The software should be actively developed and supported.

Software technical support / Re: Playing duophonically with controller keyboard
« Last post by paulsoulsby on October 03, 2018, 03:00:56 PM »
Just had a look at the code - looks like it is only monophonic.  I wrote it so long ago I'd forgotten how it worked!  I'm pretty sure the first poly code i wrote was Odytron (which came after Duotron).  I guess it might be possible to update it.  If I transfer it to the new Atx system, I'll try and do a new version for the Atmegatron too.
miniAtmegatron / Re: SparkFun Pro Micro
« Last post by paulsoulsby on October 02, 2018, 06:45:05 PM »
Hi - that range of Atmegas wouldn't be compatible without significant changes to the code and schematic.  Think it would be possible though, with the necessary changes. 
Software technical support / Playing duophonically with controller keyboard
« Last post by DeeEm on September 27, 2018, 05:13:38 PM »
Hi, I've installed the Duotron and am playing it with a midi controller keyboard. It sounds great but is there any way I can play it duophonically, i.e. 2 keys at once? That is, except the arpeggiator workaround.

miniAtmegatron / SparkFun Pro Micro
« Last post by luccasc on September 24, 2018, 05:39:57 PM »

Has anyone tried with a spark fun pro micro? It uses an Atmega38U4
miniAtmegatron / Re: MiniAtmegatron PCB
« Last post by luccasc on September 24, 2018, 05:09:22 PM »
Sorry... the schematic is here !
miniAtmegatron / MiniAtmegatron PCB
« Last post by luccasc on September 24, 2018, 05:04:42 PM »

Hello Paul,

All right ?
 I would like to ask questions if it were possible.
First question is: Is it allowed to make PCBs from your schematic? I ask this because it is impossible for us Brazilians to import anything, we are going through economic recession and import anything is costing us a very high price. If you are allowed to make PCBs, I can sell the PCBs and credit you with links to your site and your stuff, once this is allowed, I will no doubt be responsible for anyone who purchases the PCB here in Brazil.

Second question, how do I add a standard midi DIN connector, to use the miniatmegatron I attached a schematic of a connection using a 6N137 optocoupler, in which Arduino pin should I connect the RX pin of the DIN connector? On the Arduino RX pin or the D1 or D0 pin? Is there any code change if I do not want to use the USB to midi and leave the usb port only for programming and power supply ?

Thanks for this project... thanks for time and support.

Best Regards From Brazil.

miniAtmegatron / i built one - it actually works.
« Last post by ploom2 on August 04, 2018, 12:59:46 AM »
i finally got round to building my mini atmegatron and it actually works.
a bit slow as i'm a complete idiot ...

things i learnt ....
resistors dont matter which way they go round , supposed to be better if they are all 'similar' or something.
using iphone camera / ios12 magnifying thing really helps.
using the image of the fried one from this forum actually helped , an image of the components in place , close up gave me a lot of help and a bit of confidence on my progress. (can i request a nice , clear photo of a completed board top/bottom ??)

capacitors (the blue ones with funny legs , and the other brown ones)  can go in any way .. just put them in the right holes.

if you already have the case too , use the top of it to help ensure all the knobs, buttons , lights are in the right place while you are soldering things together. it'll keep them aligned and helped me out a lot (especially the small buttons and LED/light pipes)

the volume definitely touches on the usb socket on mine , i cut away what i could and put a bit of plastic in between.

LED's were tricky , i think i need to check its all working as i'm not sure i get all the expected colours on the Function led.

its making noises and changing sequences etc , all the dials do something , the button tweaks something , though i'm not entirely sure what the expected behaviour is , so more playing tomorrow. (some kind of guide on how it should perform a diagnostic might be great for an idiot like me , just a quick run through of the colours expected , sound changes , .. nothing lengthy). the youtube vids from various people look useful .

my soldering skills are not terrible and improved as i progressed ..
my eyesight is not good enough for this stuff.

overall , i learnt lots , had 'fun' i guess , very pleased it worked 1st time (even though i didn't check for shorts though i kept it clean as i went through it)

tomorrow :
check the led's are doing what they should.
hook up arduino to get some unique firmware on it , even if its just different sequences and defaults.
put the case together properly , i have 2 x screws left over.
add orangepaint to the top of each button and encoder so they stand out from the case.
add something to give each LED more sheilding so that then one flashes it doesnt impact the colour of the other too much. (piece of cardboard or something)
plug in a 9v adapter to see it that works.
find out what the note button does.

happy , my next project is repairing the encoders on my octatrack , then build my erebus diy .
if i can do this , I'm quite sure anyone can .
Atmegatron/Odytron Hardware technical support / Atmegatron's current consumption
« Last post by rio on August 02, 2018, 01:35:06 PM »
Hi paul,

please, can you tell me how high the current consumption (mA) of the Atmegatron/Odytron is? Thanks.

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