DRIVE CIRCUIT OF SOUNDDPRODUCING BODY FOR CLOCK

摘要

PURPOSE:To obtain a drive circuit of simple construction and of high efficiency by directly giving pulse width modulation signals to the serially connected low-pass filter and the sound-producig body for demodulation. CONSTITUTION:Input signal 10 is pulse-width modulated 11 to switch the complimentary compensation transistors 13, 14. The output E is inputted to the impedance 17 of the sound-producing body through a low-pass filter 20 to drive the sound-producing body with the voltage wave form closely similar to the input signals 10.