I've got a question about the capacity of power supply in the Polysix...
With the addition of the Arduino, and with the addition of another microcontroller that's scanning the keybed, I'm pulling 150-200 mA at 5V. Of course, I removed the 8049 chip from the key assigner, and based on its datasheet, it might have been pulling 50-80 mA. So, net, I'm pulling an extra 70-150 mA of current from the Polysix's 5V supply.
Is this safe? Does the Polysix have this much extra capacity?
I'm in the USA, so my polysix has the 110-120V power supply. Also, I measured the 5V test point on the polysix's power supply PCB and, with the addition of this load, the 5V sagged by 10-15mV, which was easily addressed with the VR.
So, does anyone think that this'll be a problem? I could add another 5V supply, but why do that if the built-in one works well enough? Thoughts?
Thanks,
Chip
--- In PolySix@yahoogroups.com, "chipaudette" <chipaudette@...> wrote:
>
> Hi All,
>
> I've resumed work on adding aftertouch and velocity sensitivity to my polysix. As I discussed earlier, my first step is to replace the 8049 key assigner with something that is fully under my control. I chose to replace the 8049 with an Arduino.
>
> If you want to see how I wired it up, check out:
>
> http://synthhacker.blogspot.com/2013/03/polysix-replacing-8049-key-assigner.html
>
> I've got the first set of software working. I'm controlling the Polysix via MIDI through the Arduino. I didn't really expect that my voyage of adding aftertouch and velocity would end up with me creating my own MIDI interface for the Polysix, but that's where I am. It was pretty fun!
>
> The next step is to physically install the Arduino and the new keybed (and its own controller) into my Polysix. I'm really quite bad at the mechanical stuff, so I'm pretty nervous.
>
> Has anyone else modded any of their keyboards (Polysix or otherwise) with Arduino? Did it work out OK?
>
> Chip
>