SIGNAL CONDITIONING, DATA ACQUISITION, AND SPECTRAL ANALYSIS - Design and Development of Medical Electronic Instrumentation - page 223

TO J2 OF UNIVERSAL
SENSOR INTERFACE

1 1

IC1
MOC3031

2

15

R3

R1 R2

1 3

1 6

560 1.2k

4

100

17

RLOAD

C1
0.1uF

TR1
Q4004

18 2 4

6

ZERO

19

CROSS

20

CIRCUIT

8

117VAC

R5

21

Q2
2N2222

22

1k

10

1 23

B1
9V

24

12

+

1 25

CONNECTOR DB25

BATTERY - (POWER AND DIGITAL GND)

Figure 5.10 The digital-output lines of the universal sensor interface can be used to control ac loads in response to sensor inputs. This line-
control interface is suitable for turning on or off relatively light ac-powered loads. (From Prutchi [1999]. Reprinted with permission from
Popular Electronics , June 1999 © Gernsback Publications Inc.)

TO J2 OF UNIVERSAL
SENSOR INTERFACE

1

14

2

15

1 3

IC1
PS2506

4

RDROP

17 4 1

5

18

AC OR DC
INPUT

6 3 2

19

2 7

8

21

9

22

B1
9V

10

R2
220

23

11

1 24

IC2
MC78L05CP

25

13 3 1

VIN VOUT

CONNECTOR DB25

C1
.01uF

C1
.01uF 2

Figure 5.11 Use this circuit to translate and safely isolate external ac or dc levels (e.g., power switch closures) to signals that can be read
by the digital input lines of the universal sensor interface. (From Prutchi [1999]. Reprinted with permission from Popular Electronics , June
1999 © Gernsback Publications Inc.)