DESCRIPTION
The Contek LS1240A is a monolithic integrated circuit, designed to be as a telephone ringer . It can drive directly a piezo-ceramic converter (buzzer). The output current capacitity of Contek LS1240A is higher than Contek LS1240, For driving a dynamic loudspeaker , Contek LS1240A needs only a decoupling capacitor.

FEATURES
* Low current consumption, in order to allow the parallel operation of 4 devices.
* Integrated rectifier bridge with zener diodes to protect against over voltage. *Little external circuitry.
* Tone and switching frequencies adjustable by external components.
* Integrated voltage and current hysteresis.