500 - 20 - 11

4

R

E

0.033

V

B

10

2

3

=1.35VDC

+

100

8

5

6

7

1k

10

+

4

LS505

33k

+

LS505

1

-

200

2.2k

56

100k

10k

1.0

All resistors in ohms, all capacitors in farads unless otherwise stated

Fig. 3 Typical Hearing Aid Applications

47

46

45

44

43

42

41

40

10

50

100

500

1k

5k

10k

Fig. 4 Volume Control Range vs R

E

EXTERNAL RESISTANCE (

Ω)

Fig. 5 GM

vs R

7

6

5

4

3

2

1

0

10

50

100

500

1k

5k

10k

EXTERNAL RESISTANCE R

E

(

Ω)

Fig. 6 Load Current vs External Resistance

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

10

50

100

500

1k

5kk

10k

R

E

Ω

130

120

110

100

90

80

Fig. 7 I/O Characteristics

30

40

50

60

70

80

90

100

110

DIODES

DISCONNECTED

INPUT (dBSPL)