do you know how to build a magnetic shield (or case) to protect the tape stripe cards using by ATM machines? I need it to be like a case which fits in a pocket and also can be made at home.thankyou.
That's not so easy as you might think,. Magnetic fields are very hard to block, and go through most materials like their not even there. What electronics uses for shielding is iron bases metal- that is - Steel the concentrate the magnetic field within itself, protecting what ever is on the other side. General solution? common sheet metal bent to a card holder and line with some cloth.
