An apparatus with a direct-current to direct-current power transformer is configured to transform an input voltage at an input terminal to an output voltage at an output terminal. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the patent and Trademark Office patent file or records, but reserves all other copyright rights whatsoever. Hence, a break-interrupt can occur even within an interrupt inhibition period by a normal interrupt. The read head reads data on the magnetic stripe and produces a signal indicative of data stored on the magnetic stripe. The second undercoating layer is disposed on the resistant layer.