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Offline silverdogTopic starter
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« on: January 05, 2011, 11:46:35 am »
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CHANCE Pcb's have finally arrived, delayed by Snow and Christmas Holidays but at last with me.

I only have 20 available so be quick

I haven't built Chance so make no claims for the performance, or even the accuracy of the boards but will support wherever I can

PM me for payment details

1 x $12
2 x $20

postage is $4 Worldwide or $3 to Europe

{alt}
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http://www.silverdog.co.uk/projects/chance/pcbfront.jpg
http://www.silverdog.co.uk/projects/chance/pcbback.jpg

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Offline jakub
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« Reply #1 on: February 04, 2011, 02:14:29 am »
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The board is ok, but needs some work. The top layer ought to be almost all coppered over with many ground connections. I think Andy planned this one as a 3 layer board. It would have been easier to copper the top layer and add a couple of air wires where they are bridges the top of the board now. As is, I am still working on the board and have put in a few air wires to finish many of the missing ground connections. I still need a few parts so I don't know if it works yet..

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Offline silverdogTopic starter
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« Reply #2 on: February 04, 2011, 04:25:02 am »
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CHANCE problems

I fear you are correct - I have been working on mine this week and noticed missing grounds etc...
I fear I may have made a mistake on these, although I am still a bit confused
If a top layer ground is also required how is the one working shown below ?  I guess not using Andy_F board layout ?
If a copper top layer is used, I guess it is ok to use thru hole plating on every hole still ?

My apologies for anyone with one of these boards - lets work together and sort these jumpers wires out so we can get a working unit
I promise anyone who has purchased a board, once sorted and a new layout agreed, and if CHANCE works ok, I will get new boards made and
you can have a free replacement - I would have to ask for the $4 postage though

Silverdog

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« Reply #3 on: February 09, 2011, 08:32:03 pm »
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Finished putting it together and with the additional jumper wires it works!

Just a bit noisy....

Haven't field tested it yet. Still have to mess around with the housing. Found a half burned out minelab goldsearch with the 400uH half still working (works OK with the detector) but I am going to make a new and larger coil via bbsailor.

I changed the ICL7660S to an LT1054 for its much higher current rating and it is directly compatible. I haven't tweaked the damping resistor, which I think would be helpful (390 ohm is quite low). It detects an AUS $1 coin at about 15cm on a 20cm coil in air but I think it can do better.

Work in progress but looks like a good detector.

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Offline Mudflap
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« Reply #4 on: February 09, 2011, 09:10:03 pm »
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Way to go Jacob Clapp. Keep us informed.

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« Reply #5 on: February 09, 2011, 09:43:43 pm »
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Yep!  Ware there's a will there's a way.  Your Da Man.

Is there any way you can Post a Photo of the Board and Links made?

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« Reply #6 on: February 09, 2011, 09:58:17 pm »
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A photo of the links made is in the second post of this thread...

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Offline silverdogTopic starter
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« Reply #7 on: April 14, 2011, 05:14:55 am »
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New CHANCE boards are here and working !!

I have added the boards to my shop, in the kit section I have also added the board with a preprogrammed Atmega, should you not have the ability to do your own. Full kits will be added in a few days.

A few more components have been added as well

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regards


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« Reply #8 on: April 14, 2011, 09:01:17 am »
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Silverdog, old buddy, I am just tickled about your little cottage industry endeavor. Well done!

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
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« Reply #9 on: April 14, 2011, 07:02:47 pm »
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Ya.... hoo! I have most of the small stuff ready to go. Wasn't in a hurry to program the Atmega8 as i don't have a programmer for it. Silverdog to the rescue Clapp

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