Casio SK-1 MIDI Modification v1.1 Peer Review Request
Hey everyone… As I mentioned last night that I would have to do, I’ve redesigned a bunch of the Casio SK-1 MIDI Modification PCB. This was to fix some { big | fat | stupid | huge | absurd | inexcusable } mistakes made in the original design.
I think the design is now good, but I’m curious if anyone would be able to look it over for me. The schematic I made can be found here in PDF format, and the original which it was designed after (and should be checked against) is here as a PNG.
If you are curious about the board layout, a 300dpi representation of it (without ground plane) can be found here as a PNG.
As notes, the MIDI input section is different, mostly because the original PC900 optocoupler is becoming harder to find. The standard 6N138 is used instead. I also tossed a couple bypass caps near the CPU and ROM, just to help ensure that they are stable.
Thanks very much. :) I’m hoping to order these this weekend or Monday, if possible.
i looked at both items and i have a suggestions to making this more effective for any future reviews you do.
I had a hard problem double checking some items because I didn’t know what the pin assignments were except from the wire labels or if I managed to find the data sheet online. It is usually best if you build these names into the symbol created on the schematic if your design program does it.
Another suggestion is that you provide the layout files instead of a picture of them or a layer key because then a reviewer can view each seperate layer and find alignment issues. Plus we can see how each net is tied to a specific etch line in the mask on the board.
other than that, it’s good from what i can tell.
Thank you. :) As long as the schematic is good the layout really has to be good, else the DRC (design rule checker) will throw up errors.
I really think this layout is good… I’m just going to clean up the resistors in the actual layout then call it good. I think the boards will probably be ordered on Monday.