11 Mar
2013
11 Mar
'13
7:05 p.m.
On 03/11/2013 09:55 PM, Brent Hilpert wrote:
Well, that's interesting. The roller is not an issue according to them.
Despite my own assumption about the roller being the problem, I
shouldn't have said one would think it could be done self-clocking
without a roller - I know it can be done self-clocking without a roller:
I looked back at my docs for the reader project and see I picked the
data & clk outputs off the read amps and interpreted them with an
assembly program - no roller sensing involved.
Just a PLL...doing self-clocking in that manner is pretty easy.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
I believe the plastic wrap trick is to give the
rubber roller in the
reader a better grip on the card, if the card is too slippery to make it
turn.
Most of what I've read seems to say that it lowers the signal level a
bit and reduces some extraneous noise in the signal:
http://www.creditcards.com/credit-card-news/lick-plastic-bag-credit-card-se…