Recent Posts

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Fault report / Re: Very loud mains hum from audio out
« Last post by simeonnotsimon on January 12, 2018, 04:03:56 PM »
Hi Paul, thanks for getting back to me. I've followed your instructions and the hum goes away when I waggle the blue cable connection to the PCB buy pushing it to the left (see attachment), but returns when I release it. Maybe its the soldering connection of the small white female socket ?
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miniAtmegatron / Re: Is Miniatmegatron open source?
« Last post by paulsoulsby on January 12, 2018, 12:10:03 AM »
You can download all the libraries: https://github.com/soulsbysynths/libraries
and .ino: https://github.com/soulsbysynths/SsMinMiniAtmegatron

or just use Easy Uploader and the .hex file.  It'll def work with any Arduino Uno. I assume you've installed the Arduino IDE which has the Uno drivers.
Click "show console" and copy and paste the error and I'll tell you the issue.
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miniAtmegatron / Re: Is Miniatmegatron open source?
« Last post by veryfungi on January 11, 2018, 10:47:22 PM »
Hi Paul, thanks so much!

Today I had set a side some time to test the little bugger. I was surprised about the hex file instead of a normal ino file. I expect it's due to some assembly language code inside the program. Unfortunately the guide I found online didn't work. It instructed me to turn on verbose when uploadig, looking at the actual command it uses and to replace the file locating of the hex file with your file. I used the command prompt, but there was an error, it could not fine a command at c: bla bla. Is there a better way? Thanks
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Atmegatron Librarian / Re: Atmegatron librarian CPU usage
« Last post by paulsoulsby on January 10, 2018, 11:18:56 PM »
Hi.  I've just done some tests.  I'm afraid I don't have any machines left on Win7, they're all on Win10, but I'd imagine the problems would be reproducible on both OSs.
I did a fresh install of the 64-bit installer on website.  The machine didn't have any Java or Netbeans (the IDE it was written in) installed.

I did notice that the installer behaved very oddly. It sat there for a good couple of minutes doing nothing, but eventually it did install successfully.

I then launched Librarian and it behaved completely normally. The Task Manager was showing 30-40% for Librarian, but no other apps were doing anything!  I thought a fairer test would be to play a Youtube vid in the background and see how it coped.  Screenshot attached. 

The performance of the app isn't great, but Java is famed for being processor intensive.  I don't think there's actually anything wrong with the app.  It's not bad enough for my laptop to heat up or anything!

Could you try completely removing Librarian and all Java run time installs.  Then download and install Librarian again.  It has the Java environment inbuilt to the installer, so no need to install Java manually.

Let me know if it starts behaving then!
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miniAtmegatron / Re: Is Miniatmegatron open source?
« Last post by paulsoulsby on January 10, 2018, 11:01:44 PM »
Looking really good! The mini uses the big cap as a cheap and easy way to remove the dc bias on the audio output. Considering Eurorack has dual power lines, I'd definitely recommend going to down the route of using the opamp to bias the audio properly.  However you won't need the cap before that stage, you'd want it at the output, along with a 1k resistor, as Eurorack has a standard of  1k output impedance.
Attached is the Oscitron output stage for your reference.  Very similar to yours apart from I derived the 2.5V using a voltage ref. Hope this helps!
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Fault report / Re: Very loud mains hum from audio out
« Last post by paulsoulsby on January 10, 2018, 10:43:04 PM »
Hi - I think this is just the internal audio cable that has come loose in the post.  It's very easy to reseat. Do the following:
1)  Undo the 4 screws to the base plate
2)  Reseat the blue cable connected from the 1/4" jack to the PCB
3)  Test it.  If working, do it back up.  If not working, try waggling blue cable while it's on and making sound and let me know if it makes any difference to the issue.

If this doesn't make any difference, email me on info@soulsbysynths.com
thanks!
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Fault report / Very loud mains hum from audio out
« Last post by simeonnotsimon on January 10, 2018, 02:27:20 PM »
Hi. Ive just taken delivery of a B stock Atmegatron. The audio out from headphones is fine, but mains hum from the audio out is very loud and drowns out the audio. I've tried it on several different mixers and different power sockets but the result is the same. Any suggestions much appreciated. !

Ive just found out that plugging into the heaphones socket, which is plugged into the mixer gets rid of the hum, whereas plugging in headphones only reduces the hum slightly.
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miniAtmegatron / Re: Is Miniatmegatron open source?
« Last post by veryfungi on January 09, 2018, 06:26:50 PM »
I did the face plate over and adjusted the laser settings. I think I like the black better than faux aluminum. Next step is to install the program and start testing. I left off the components for the level shifting and will breadboard the amp first. After it's tested I will populate the board and solder them in. Do you have any input on the circuitry I asked about?
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miniAtmegatron / Re: Is Miniatmegatron open source?
« Last post by veryfungi on January 08, 2018, 03:13:41 AM »
Hey there Paul,

I'm putting this together and everything is working out well. I am almost ready to test it. Thought I'd share some photos of it. I'm hoping to get some cool sounds from this little project. :) The panel is laser plastic and I noticed the text is too dark in the upper box. I will fix it. I'll make an aluminum panel for it once my workshop is warmer.
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miniAtmegatron Hardware technical support / Re: is this r22?
« Last post by personwithaquestion on January 06, 2018, 12:02:57 AM »
Thanks for your reply.  I tested all resistors. I just wanted to ask.
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