Search found 5 matches

by AndrewB
Tue Mar 05, 2013 1:55 am
Forum: Nixie Chessboard V1
Topic: It has Begun
Replies: 20
Views: 82700

Re: It has Begun

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...
by AndrewB
Wed Feb 06, 2013 11:49 am
Forum: Assembly instructions
Topic: Board coils discussion
Replies: 13
Views: 52784

Re: Board coils discussion

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...
by AndrewB
Wed Jan 30, 2013 10:55 pm
Forum: Assembly instructions
Topic: Piece display PCB discussion
Replies: 61
Views: 174534

Re: Piece display PCB discussion

I used 3 or 4 passes with sandpaper.
by AndrewB
Tue Jan 29, 2013 5:12 am
Forum: Nixie Chessboard V1
Topic: Black PCB Chessboard
Replies: 1
Views: 23700

Re: Black PCB Chessboard

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...
by AndrewB
Tue Jan 29, 2013 3:14 am
Forum: Nixie Chessboard V1
Topic: Black PCB Chessboard
Replies: 1
Views: 23700

Black PCB Chessboard

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