aqui fica alguma informação sobre este tema (apenas para fins educacionais):

This is the article text as it appears in the Spring 2005 issue of 2600 Magazine

Good magnetic stripe readers are hard to come by. Most are
expensive, only capable of reading one or two tracks, and have
inconvenient interfaces. In this article I will describe the process of
making an extremely cheap, simple, and reliable single-track reader
from parts that are readily available. We will be interfacing the
reader to the microphone input of a sound card, which is very
convenient for use with most laptops and desktops.

I will not be discussing the theory and concepts of magnetic stripe
technology and the assumption is made that you are somewhat familiar
with the topic. For a simplistic overview of magnetic stripe technology
that is easy to read and understand, I recommend that you read the
classic article “Card-O-Rama: Magnetic Stripe Technology and Beyond” by
Count Zero, which can be found quickly by doing a web search for
keywords in the title.

source
magnetic stripe reading
Card-O-Rama: Magnetic Stripe Technology and Beyond

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This page contains some information about magnetic stripes and devices to
read/write them. By now you can find:

source:
magnetic stripe reader/writer

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