Black PCB Chessboard

[AndrewB]

Here is the first test of my chess board. I populated a single row on the mainboard just to make sure it was all working,

More pics to follow

[AndrewB]

Here is a photo of the populated single row on the main board. The 5 volt Zener Diodes (1N5231B) are the ones around the Pic microcontroller. The 12 volt Zeners (1N5244B) are the ones on the far left and far right of the photo. All the diodes (12V & 5V) have the polarity stripe side closest to the Pic micro.

I mixed up the 5 volt diodes with the 12 volt diodes first time round but picked up the mistake before I placed the Pic micro. I swapped them around and everything worked fine.

Tony suggested the following tests before and after fitting the Pic:

"For quick power points the vertical link on the centre right is 0V and
any point on the ferrites will be OK for 12V. It should only draw a
couple of mA at this point through the 1k5 resistor next to the pic.
Once the pic is fitted the 2 links between the ferrites carry the
mosfet drive, check them for about 2.5V or a scope for 70khz"