 2010 Microchip Technology Inc.

DS22251A-page 3

RE46C165/6/7/8

Typical Application

Push-to-Test

9V

Battery

1µF

C5

1.5 nF

R12

10M

R9

100k

R13

330

D3

1.0 nF

1.5M

220k

R8

330

C7

10 µF

R7

22

C4

100 µF

D5

D6

R4

560

C2 4.7 nF

C1 47 nF

R1

4.7k

R2

5k

R3

8.2k

120k

1.0M

R6

1k

C1

C2

DETECT

STROBE

IRED

IO

HORNB

HORNS

FEED

LED

COSC

ROSC

VSEN

TEST

R5

249k

To Other Units

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Note 1:

C3 should be located as close as possible to the device power pins.

2:

C3 is typical for an alkaline battery. This capacitance should be increased to 4.7 µF or greater for a

carbon battery.

3:

R10, R11 and C6 are typical values and may be adjusted to maximize sound pressure.

Photo

Chamber

Q3