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Hi Edgobb, To measure the current at the 1k5 resistor you need to place your multimeter in series with the resistor, i.e. disconnect one leg of the resistor from the circuit and connect this leg to one lead of your multimeter. Make contact on the circuit board with the other multimeter lead at the p...

I measured 133 uH on the piece coils & 192 uH on the board coils. I added an extra turn to a board coil and came up with 200 uH. This was on an Agilent U1733C. That seems pretty close to the theoretical value. There is a calculator here: http://www.66pacific.com/calculators/coil_calc.aspx Averag...

I used 3 or 4 passes with sandpaper.

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 t...

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