My name is Michael and I'm working on a small project called the SNESoIP. It's basically an ethernet adapter for the Super Nintendo (SNES).
After a few considerations, I decided to produce a small batch of this device. With a few extras of course to make the end-users life a little bit easier.
I was thinking about the USBaspLoader. Now my questions:
- Could it work to use the USBs VCC to trigger the programming mode condition? I'm not using USB for power supply anyways. Here are my schematics: http://misc.mupfelofen.de/snesoip-rev2.pdf
and
- Because it would cause a few problems to make the whole circuit running at 3.3V, I've to use the (dirty) zener solution. But after all I've read I'm feeling a little bit insecure in choosing the right one. Could the BVZ55-C3V6 (5% tollerance) work? I also have a few 3.9V (TZMC-Series) in stock. All variants are SOD80 (Mini-melf).
Any help is highly appreciated!
Greetings
Michael
PS: Please be indulgent; english is not my native language.