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Beeper
The EM1399-LD 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 decode. 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.
15
D2
BAT760
R6 1K
BUZZ
R7
10K
VDD
R5
10R
1
2
LS1
AS903Q
Q8
2N3904
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