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Messages - paulsoulsby

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Everything else / Re: EasyUpLoader
« on: June 11, 2018, 11:44:09 AM »
You're using an Atmega328P ?  It should work fine for that, but not for any other Atmega.  This is because I have hard-coded the Atmega328P into the AVRDUDE command in the software.
Also, you should have a cap (think 0.1uF) in series with the reset line in your schematic.  Do you have this?

Oscitron Hardware Technical Support / Re: Uni-Five Installation
« on: May 07, 2018, 07:15:38 PM »
Those are up on the downloads page now.

Everything else / Re: Midi controllers
« on: May 07, 2018, 01:14:03 PM »
Hmm, well I was actually next to DIN Sync at Superbooth and he has a 101 DIY project that looks amazing!
Ginko have the new sampler slicer module if you're into modular:
Not too sure about 8-bit options at the mo.  Most seem to be preassembled.

Oscitron Hardware Technical Support / Re: Uni-Five Installation
« on: May 07, 2018, 01:06:12 PM »
Yup, red stripe down on everything I make.

Excellent, glad you got it working. Sometimes the computer needs a restart after installing the FTDI drivers for it to work properly.

Everything else / Re: Quick test
« on: March 30, 2018, 01:37:24 AM »
It worked!  Let me know if you have any other issues.  Will delete in a couple of days if all's working now.

Odytron / Re: odytron 1.3v
« on: February 18, 2018, 01:40:51 AM »
try it now - there was an html tag missing which makes it download rather than display in a page

miniAtmegatron / Re: Is Miniatmegatron open source?
« on: January 28, 2018, 10:50:11 PM »
I would much prefer a simple 7 segment display controlled by a shift register. I could wire up a shift register to a display, but I can't program these, so I guess I will keep trying. thanks

The main issue would be that the a shift register requires 3 data lines, but there's only 2 available for the value LED.  You could make use of pins 0 or 1 if you don't intend on using MIDI.  It would take some careful programming to make sure that the time taken shifting of data to the display didn't halt the playout of the sequencer.
Possibly a simpler alternative would be to put a MIDI connection on the front panel (using mini-jack wiring).  Then control it from an external MIDI controller, or even use the Touch OSC or Lemur templates for a graphical interface.  All parameters are available on MIDI CCs.

Software technical support / Re: Flashing from Linux
« on: January 17, 2018, 02:23:58 PM »
Hi - I am really keen to get into using Linux, but I have zero knowledge about it and right now I don't have time (in the middle of developing new synth).  I don't have any Linux machines and even building one seems full of choices (which OS do you use BTW?), let alone working out how to use it!
If I give you the source code for the Easy Uploader, would you be happy to install and run it from Qt?  Qt is free and running it is as simple as opening the project and hitting the green play button. 
cheers, Paul

miniAtmegatron / Re: Is Miniatmegatron open source?
« on: January 14, 2018, 12:58:30 AM »
Hi - just follow the instuctions on the Downloads page!  It's really easy and doesn't take long.  All downloads are on that page (Easy Uploader and the hexs)
Also a tutorial video here:

Will email now.

Fault report / Re: Very loud mains hum from audio out
« on: January 14, 2018, 12:53:51 AM »
Hmm hope it isn't the soldering on that socket.  I'll probably have to ship it back to me to fix it if it is, as soldering that joint isn't an easy job.

Couple of things to try before getting to that point:
1)  Pull the cable off of the header.
2)  Scratch a screwdriver on the header pins to make sure there's a good metallic contact and there isn't any dirt or gunk on them.
3)  If you have a small flathead screwdriver, push it into the little long thin gaps on the white header socket. This releases the metal clips so the white plastic part of the socket comes off.  Look at the 2 pins, are they bent flat? If yes, try and reshape it so it looks like this: 
4)  Then reassemble and reattach cable.
Another option could be for me to post another blue cable to you. It's fairly easy to replace, you just need pliers to remove the 1/4" jack.

Don't worry if any of this is too much effort or goes wrong, email me and I'll arrange a return. Just trying to avoid you having to be parted from the synth!

miniAtmegatron / Re: Is Miniatmegatron open source?
« on: January 12, 2018, 12:10:03 AM »
You can download all the libraries:
and .ino:

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.

Atmegatron Librarian / Re: Atmegatron librarian CPU usage
« 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!

miniAtmegatron / Re: Is Miniatmegatron open source?
« 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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