A design approach of late-model three track card readers based on GMR sensors

to realize low bit error rate and solve problem of different card feeding speed by users to meet the financial

commerce

posts and telecommunications field requirements. Data collection

analysis and read of three tracks magnetic card is realized based on decoding chip M3—2300—LOL

filtering and decoding circuit are designed. Test results demonstrate that GMR magnetic head can replace traditional film induction（ TFI） head

this magnetic card reader system operates stably

and has good effect.