Arduino Forum

Community => Bar Sport => Topic started by: dougp on May 17, 2018, 07:00 pm

Title: Credit card chip contacts
Post by: dougp on May 17, 2018, 07:00 pm
I've seen credit cards with yellow contacts and with dull silver contacts.  Does anybody know what is the material used for these two varieties?

TIA
Title: Re: Credit card chip contacts
Post by: Robin2 on May 17, 2018, 08:17 pm
Gold and silver ?

...R
Title: Re: Credit card chip contacts
Post by: dougp on May 17, 2018, 08:33 pm
Thanks for the reply.  I thought of those two but it seems an expensive option for a credit card. 
Title: Re: Credit card chip contacts
Post by: Robin2 on May 17, 2018, 09:14 pm
Thanks for the reply.  I thought of those two but it seems an expensive option for a credit card. 
There won't be very much of it. I'd guess you would need to recycle a large number of cards to get $100 worth of gold.

...R
Title: Re: Credit card chip contacts
Post by: dougp on May 17, 2018, 09:56 pm
There won't be very much of it. I'd guess you would need to recycle a large number of cards to get $100 worth of gold.

...R
Yes, if it's a precious metal the thickness is probably measured in 10/1000ths of an inch.
Title: Re: Credit card chip contacts
Post by: Coding Badly on May 18, 2018, 07:06 am

I believe the unit of measure for such things is µin (microinch).

Title: Re: Credit card chip contacts
Post by: Robin2 on May 18, 2018, 09:37 am
Yes, if it's a precious metal the thickness is probably measured in 10/1000ths of an inch.
10/1000 = 1/100. If the gold was that thick my card would be worth more than the amount in my account.

I suspect microns is the more likely unit of measurement. Or the even smaller micro-inch that @Coding Badly mentioned. I never heard of micro-inch before - but that may be just because I am on the right side of the Atlantic.

...R
Title: Re: Credit card chip contacts
Post by: Coding Badly on May 18, 2018, 09:44 am
Or the even smaller micro-inch that @Coding Badly mentioned.
After a spot check a Digi-Key:  That does seem to be a common unit for gold alloy contact coatings.  50 to 200 seems to be a common range.

Title: Re: Credit card chip contacts
Post by: Robin2 on May 18, 2018, 09:58 am
A micro-inch is 0.0254 microns so 50 µin would be 1.27 microns.

...R
Title: Re: Credit card chip contacts
Post by: dougp on May 18, 2018, 01:44 pm
10/1000 = 1/100.
I misstated. My intent was .0001 inch. Apparently even that's much more than needed.
Title: Re: Credit card chip contacts
Post by: dougp on May 18, 2018, 01:49 pm
After a spot check a Digi-Key:
Wish I'd thought of that.  I put 'credit card metal' and a few variations in the search bar and got lots of off-target results.

But, I did learn that there are metal credit cards (https://metal-creditcard.com/). Who knew?
Title: Re: Credit card chip contacts
Post by: Robin2 on May 18, 2018, 02:45 pm
I misstated.
I had figured that. I was just having fun.

...R