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Help me with a magstripe card reader design

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Jaannee

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Magstripe reader ???

Hi!
I would like to build a magstripe card reader. I have only found single ended amplifiers on the net but would like to build a differential one to suppress CM-signals. The one I have tried to build gives a signal which's offset is drifting between bits making it very difficult to run it through a comparator. The dutycycle varies too much to decode the datastream properly.

Help?


/Janne
 

Jaannee

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Fixed It!

OK,
fixed the problem with a differentiator...

/Janne
 

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