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My PCB order from Golden Pheonix arrived, a day less than two weeks after ordering them. Not bad turnaround!
The PCBs themselves are really nice and I have loads (ordered a panel though I'll only need one or two of each), though I'm yet to actually solder them up. I plan to use some solder paste I just got and reflow them under the grill, which I hope will work.
The only problem I've identified is that one of the PCBs is physically broken (a small bit snapped off when being cut presumably) which breaks two traces, but they'll be easy to fix with a small wire if needed.
They are for my current project - see if you can guess what it is!
Seen Here: The PCB out of the bag! (Torch see-through vision!)
So, today my PCB for the LED matrix arrived from BatchPCB! For what I paid, the PCB arrived fairly quickly - I ordered it on the 15/02 I believe, and it arrived 11/03 -- 26 days, which is pretty good (they state 19 business days).
The quality is very, very impressive - far better than anything I could pull off at home. The silkscreen and soldermask makes it look really nice, too.
Soldering it was a joy, although there was a LOT to solder and it's all surface mounted.
I had a few problems at first; it wasn't lighting the matrix at all properly but I soon realised with my new design (transistors on the cathodes) I have to write the transistors HIGH to get a LOW on the cathode, so a quick line of code changed to get that working.
Then for some reason the top half of every letter was flipped. It turns out this was my fault: I messed up when making the package for the LED matrix in Eagle, swapping the matrix's 5th cathode for my system's 8th, 6th for 7th, 7th for 6th and 8th for 5th. This was fairly easy to fix in code, however.
Finally USB isn't working to program or communicate, but I can configure the FT232RL chip (after all, it's sending the clock pulse that's driving my ATmega168). I think I have an idea of what's causing this, but I'm not sure yet.
I took this old PCB out of a broken DVD player to see what interesting colors, shapes and textures could be saved from this now piece of junk.
Atari 2600 PCB composite. I photographed it from the top and bottom, cropped each to the correct size rectangle at 300dpi (perspective-corrected), and overlaid them.
From Dirty PCBs dot com. Dirt cheap, better than adequate quality, simple ordering, good web feedback, any shape you like, the panelising that enables and dirt cheap, yeah really dirt cheap... Which means you give your imagination a chance for minimal risk. One of these panelised boards was more of a rushed test than the other and having received them in the flesh I can instantly see how I might have done it better. But the total order price was $25 for 10 10x10cm of board, which I fit 2 boards into panelised. So it was $12.50 to experiment, get 10 functioning boards and a powerful experiential lesson. That's the real value of dirt cheap. Then there's the other 10 boards that I couldn't be happier with... for $12.50. My next order is already in...
Technology - High tech gadgets are great when they are working; but sorry to say...this is the guts of my broken laptop. I'm in a dark mood today.
Top side of the StarPointer virtual electronic finderscope.
All the details of this project are available at jayakody2000lk.blogspot.com/2022/06/virtual-electronic-fi...
PCB worktable finally liberated from the Temple of the Zombie Spiders. First mission accomplished! Now wait some weeks for Shapercube manufacture and delivery.
Some relevant links:
wiki.shapercube.com/wagn/Shapercube_2_1_Manual
wiki.shapercube.com/card_images/0000/1826/IMG_5511_web.JPG
The circuit board populated with its op amps, photodiodes and 80 superbright white LEDs.
Read more about the interactive LED coffee tables here