PCB Coil?

[bbsailor]

Sewer Pipe Coil Form

bugwhiskers,

Your 313mm OD sewer pipe coil form will make a 309uH coil that is 29.6 mm high with 22 turns of AWG 24 insulated hoop-up wire.

Happy Holidays

bbsailor

[Sean_Goddard]

Just an "outlandish" idea, but if you use 2oz copper clad board, then have the tracks "hot tinned" using a roller, or have it tinned then hot air levelled, you will increase the thickness of the tracks. Alternatively you could investigate some of the specialist PCB manufacturers who make their own clad board to your specifications.

For some of the military stuff I've worked on, I've seen 6 and 8 oz stuff for some of the heavy transmitter boards in the heavyweight units.

Just a thought.

[Sean_Goddard]

Check these guys out 400um copper http://www.top-tec-pcb.co.uk/?gclid=...FRraZgodqETZ9Q

Or these with heavy copper capability http://www.protoexpress.com/content/highTechnology.jsp

[bugwhiskers]

Hi Sean,

Thanks for those links.
I am only just starting to get back into it after a month off over Christmas.
Actually, I am thinking about using standard 1oz PCB then electro-plating with silver (the best conductor and not overly expensive). Tarnishing won't be a problem as the whole coil will be potted in epoxy.

I don't suppose you have any clues on how to accomplish this easily?

regards

bugwhiskers

[amtech2005]

PCB Coil?

Here is something very interesting. I remembered seeing this a couple years ago and found it again . But not to much information , I am sure its a PI. Sure would be nice to have a schematic on this one. I dont know if this went into production , this photo was the prototype. See the Coil on the circuit board. Theta-Engineering is the web site found through Google search. Eugene [email protected]

[Leto]

thanx amtech2005 really interesting, even more with text:

Metal Detector – Developed a metal detector which improved on state-of-the-art by reducing power consumption to the point where it would operate for 9 months on a set of D cells, eliminating the necessity for an on/off switch thus preventing its alarm function from being easily defeated. This device utilized a Microchip microcontroller to reduce circuit complexity by replacing circuit functions with firmware. The microcontroller also allowed design flexibility, digital signal processing and additional power reduction techniques to be applied. Small but sophisticated DSP filters were implemented to improve the design's ability to operate in an environment with a high degree of ambient magnetic noise.

http://www.thetaeng.com/MetalDetector.htm

[Sean_Goddard]

Let me hunt around a bit, see what I can find, OR if you could buy some battery acid and dissolve some scrap silver in it, then dilute the solution and electro plate the copper yourself. The way I "tin" a board is to use old solder wick and a good hot iron and pull the wick along the tracks. Crude and slow, but it works.

I take it this coil is for a PI?

[bugwhiskers]

Hi Sean,

Thanks for your reply.
Solder is probably a not much better conductor than copper. If I go for the silver plate approach I can control the thickness and uniformity which is a problem with tinning with an iron.
Commercial plating solutions contain Cyanide and I think you need a license to buy and use them and besides, I am too young to die.

regards
bugwhiskers

[Sean_Goddard]

No don't go playing with that stuff, I wouldn't want that to happen to you either!!

[WesP]

Take a look at this web site. They sell metal planting kits an many of them are non toxic. http://www.caswellplating.com/kits/index.html#

[Sean_Goddard]

Nice one Wes!!

[bugwhiskers]

Thanks for the info Wes,
Had a look at the method and it uses a bandage to wipe. It doesn't sound like a uniform thickness method. I fiigure a bath plus some electrical current is probably what I need. A local plater can do it but at $20 it's a little expensive for a couple of grams of silver which sells for $12.00 an ounce.

regards
bugwhiskers