An apparatus for providing synchronous rectifier gate drive timing is described. The spring cover defines at least one spring cavity therein and has two ends. The flooding evens out depressions due to uneven shrinkage in the thick and thin areas of the carrier body and a smooth surface can be produced, which can subsequently be covered with a reflective layer. Dosage forms, drug delivery systems, and methods related to dextromethorphan or dextrorphan and threohydroxybupropion or a prodrug of threohydroxybupropion are also disclosed. At the same threshold, operation of the first and second amplifiers may be transitioned, e. According to another aspect, the portable media device has the capability to store media device status information in persistent memory before powering down.