Circuits and methods for calibrating offset error in a differential amplifier in an efficient and reliable way are described. A user selects all or part of the data stored on the storage medium to enable. The balance unit balances the currents provided to the plurality of lamps in the lamp module. The novel power supply is routed to the appropriate safety mechanisms when the vehicle emergency event sensors, ie rollover, impact etc. Methods of preparing the water-soluble polymers and thin films prepared therefrom are also described. The absorbent binder composition is particularly suitable for use in manufacturing absorbent articles.