reCLOCK

Also the first PCB, did worked. There are some issue:

• It could only run on 3.3V because of a mistake with the p-fets
• The footprint of the LEDS were so much undersized, that soldering was quite difficult an unreliable
• The TSSOP package of the shift register looks to big

As Solution a made a new revision:

• Now with smart integrated high-side switches (TPS22912 or similar) and because of these with more BGA parts
• Bigger Solder pads for LEDs. Some new routing was needed, because now only one trace fits under each LED. But OSH-Park's new 10mil Drills helps a lot.
• the shift register is now also QFN.

Here some preview of the boards:

all soldering done

it is partial working!

This project is still ongoing and I did received the PCBs some time ago. I also started soldering and programming. Here a picture of the line driver section of the PCB:

I also got a little bit into trouble with the LEDs. Some how I placed them all in the wrong direction in the schematic. So that the cathode marking on the PCB is now an Anode marking. The really bad thing is that I noticed that after soldering all LEDs the wrong way around.

During the first programming/debugging secessions I also made this test pad overview:

The PCB design is ready. And there are now only LEDs on the front side. And no more 0 ohm SMD resistors as bridges.

....

first published renders. (with ugly resistor bridges on the top/front layer)