Piezoelectric Buzzer Circuit - Panasonic JS-170FR Series Service Manual

2.1.8

Piezoelectric buzzer circuit

For use as a signal for the piezoelectric buzzer, a rectangular wave output is generated from Pin 17 of the FW82371EB.
The diode D_A is used for the prevention of counter electromotive force.
The driving voltage is +12V.
+ 1 2 V
FW 8 2 3 7 1 E B
D_ A
L S
1 K
L
DT C1 2 3 YK
MA1 5 7
K1 7
S PKR
Q _1
2-36