free us cellular ringtones In addition, they contain advanced "pop and click" circuitry to eliminate noises that typically occur during turn-on and turn-off transitions. All three speaker drivers allow the flexibility of running a handset at a low voltage, increasing talk time in cellular applications. National's new amplifiers provide additional benefits such as reduced component count and electromagnetic interference and noise, as well as increased space savings and performance for customers. The LM4960 is designed for piezoelectric speakers. It integrates a switching regulator, a current-mode boost converter operating at a fixed frequency of 1. 6MHz, to drive a dual audio power amplifier. It delivers 24VP-P mono-BTL to a piezoelectric speaker with less than 1% THD+N while operating on a 3V power supply. The LM4961 for ceramic speakers includes added battery savings, with a low-power mode for earpieces and a high-power mode to drive the ringtones and hands-free speakers.

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