SKY9x Introduction

SkyNorth · Post by **SkyNorth** » Wed Oct 24, 2012 10:00 pm

Here is the Rev 3.0 Version of the SKY9x Upgrade Board
This is the Final design , that has been sent out for Fabrication.

I have ordered 125 boards .... and about 80 are spoken for so far...

The boards are due in two weeks , then off to the SMT assembly house...
If all goes well , I hope to start shipping them by the end of November.

-Brent

Clivew · Post by **Clivew** » Wed Oct 24, 2012 11:03 pm

Aha,

A nice new toy for Christmas perhaps

Good work Brent!

gohsthb · Post by **gohsthb** » Thu Oct 25, 2012 11:34 am

Looks great, I can't wait.
-Gohst

kaos · Post by **kaos** » Thu Oct 25, 2012 11:50 pm

Time to order my 2nd BT module from ebay.

nsf · Post by **nsf** » Fri Oct 26, 2012 9:53 am

Can you recommend one? Time to start gathering the parts

kaos · Post by **kaos** » Sat Oct 27, 2012 4:17 am

I used this one with the Ver B board and working. I will get one again for the V3:
http://www.ebay.com/itm/Wireless-Serial ... 53eb8e2d89

RJM · Post by **RJM** » Tue Oct 30, 2012 1:42 am

Brent: Do you have schematics to go with the above diagram?

SkyNorth · Post by **SkyNorth** » Tue Oct 30, 2012 12:06 pm

Here is the Schematic

SKY9x_Rev_3_0.PDF: (627.91 KiB) Downloaded 722 times

The schottky diode are being changed , the leakage is too high on the MBRX140
-Brent

Post by **ShowMaster** » Tue Oct 30, 2012 4:40 pm

SkyNorth wrote:Here is the Schematic

SKY9x_Rev_3_0.PDF
The schottky diode are being changed , the leakage is too high on the MBRX140
-Brent

Is D9 the one to stop the coin cell from discharging to fast? What diodes should be changed and what's a good retrofit replacement. SMD or otherwise?
SM

SkyNorth · Post by **SkyNorth** » Tue Oct 30, 2012 9:08 pm

The diodes on the Co-processor , are going to be changed to
BAT42W types , these have a leakage in the order of 500nA where as the MBRX140s' leakage is 300uA
This is almost 1000 times lower....

The higher the current rating , the more leakage it seams...

The BAT42W are rated at 200mA , which is more than enough for the task at hand.

-Brent

kaos · Post by **kaos** » Tue Oct 30, 2012 11:04 pm

Is it possible to retrofit the BAT42W to VerB board without other changes?

Post by **ShowMaster** » Wed Oct 31, 2012 12:41 am

Also how many do we want to change out. 2 for sure if only the 2032 battery is used?
DigKey $.44ea
http://www.digikey.com/product-detail/e ... -ND/717817

ShowMaster
Sent from my iPod touch using Tapatalk

SkyNorth · Post by **SkyNorth** » Wed Oct 31, 2012 12:06 pm

I would wait and see how long the battery lasts now , before changing them.
The diodes are the same foot print , so they will fit.

-Brent

Post by **ShowMaster** » Wed Oct 31, 2012 2:34 pm

Thanks Brent.
I'll do that for both boards and report the time they last.

ShowMaster
Sent from my iPod touch using Tapatalk

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