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Beeper
The EM3396 V2 provides a pin (Buzz, PIN 9) on the host interface connector that provides a PWM output to an external
driver circuit for generating audible feedback to the user to indicate statuses like power up or good read. The PWM output is
not strong enough to drive a beeper, thus a beeper driver circuit is needed.
The following beeper driver circuit is provided for reference.
D2
BAT760
R6 1K
BUZZ
R7
10K
VDD
R5
10R
1
2
LS1
AS903Q
Q8
2N3904
18
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