AEG Electrolux ERN 2922 User Manual download pdf (Page 44)

Listing 1. EPROM

Program for First

Message

DECIMAL

ADDRESS

DECIMAL

DATA

HEX

ADDRESS

HEX

DATA

DECIMAL

ADDRESS

DECIMAL

DATA

HEX

ADDRESS

HEX

DATA

128

4

80 4

166 1

A6

1

129

24

81 18

167

3

A7

3

130

6

82

6 168 55

AB

37

131

1

83

1 169 55

A9

37

"seconds"

132 7

84 7

170

7 AA 7

133

7

85

7

171 2

AB

2

134

16

86

10

172

42 AC

2A

135

2

87

2 173 12

AD

C

136

24

88 18

174 11

AE

8

137

2 89

2

175 1

AF

1

138

13

BA D

176 55

BO

37

139

23

8B

17

177

3 81

3

140

23 8C

17 "talking"

178

13 82

D

141

2

8D 2

179

22 83

16

142 42

8E

2A

180

3

84

3

143

12

9F C

181 62

B5

3E

144

44

90

2C

182

19

B6

13 "leave"

145

1

91 1

183

35

B7

23

146 23

92 17

184 4

88 4

147

62

93

3E

185

18

89

12 "the'

148

24 94

18 "alarm"

186 17

BA

IA

149

51

95 33

187

3 88

3

150

16 96

10

188 8 BC

8

151

1

97

1

189 59 BD

38

152 4

98 4

190 BE

BE

4

153 4

99 4

191

4

BF 4

154 49

9A 31

192 9

CO 9

155

31

9B IF

193

45

Cl

2D "please

156

2 9C

2

194 19

C2 13

157

57 9D

39

195

55 C3 37

158 7

9E

7 "have"

196 2 C4 2

159

35

9F 23

197 27

C5 18

160

3 AO

3

198 24 C6 18 "hurry.

161

29 Al

1D

199 59

C7 3B

162 52 A2

34

200 19 C8 13

163

2

A3

2 "thirty"

201

4

C9

4

(resets IC3

164 13 A4

D

202 64 CA

40

(resets IC1

lE5

19

A5

13

volts

ac at 1 ampere.

You can use a

transformer

whose

secondary deliv-

ers

up to 12

volts

ac.

ARM

/DISARM switch

SI applies

power

to and

removes power from

the circuit

as desired.

The ac

from

the power transformer

is

coupled

in-

to bridge

rectifier

RECTI,

where it

is converted

to

pulsating

dc and is

filtered to a

more pure dc by capaci-

tor C25. This

dc is then

regulated

down to +

12

volts

to power the

timer and piezoelectric

buzzer

por-

tions of the circuit.

The + 5

volts

dc required by the

logic, speech synthesizer

and audio

amplifier sections

is taken care

of

by + 5 -volt

regulator

1C4 shown

in Fig.

1.

Construction

You can

fabricate

your

own printed-

circuit

boards for this project

from

the actual

-size

etching-

and -drilling

guides shown

in

Figs. 3 and

4. Note

that there

are two pc boards

for

this

project.

One contains

all the circuit-

ry

that

is

powered

by the 12 -volt dc

source, the other

all the

circuitry

that

is powered by the 5 -volt

dc source.

You might

wish

to

wire

your

proj-

ect on perforated board

instead

of

having

to

fabricate

pc boards.

If you

do, use boards that

have holes on

0.1 -inch centers and

appropriate sol-

dering or

Wire Wrap

hardware.

Al-

so, use the

wiring

guides shown

in

Figs. 5 and 6 as guides to component

layout and

wiring runs. Though

this

is not a particularly difficult

project

to

lay

out,

you must

keep in mind

that stray capacitances

must be held

to a minimum.

Start

wiring

the project

with

the

large logic /speech synthesizer

/audio

amplifier

board, shown

in Fig.

5.

Be-

gin

by

installing

and soldering into

place the sockets for all ICs except

1C4. (Do

not

install

the ICs in their

sockets until after

initial voltage

checks have been performed.) Fol-

low with

the resistors and diode,

making

sure you properly orient the

latter

before soldering its leads to the

pads on the bottom of the board.

Next, install

and solder

into

place

the nonpolarized

capacitors.

Follow

up

with

the polarized

capacitors,

again making sure they

are

properly

polarized before soldering

them into

place. Four capacitors (C30 through

C33) do not appear on either sche-

matic

diagram to avoid confusion.

To

determine

their

values,

refer to

the Parts List.

Plug the leads of the crystal into

the board,

solder

them to the copper

pads and clip them as

short as possi-

54 /

MODERN ELECTRONICS

/

February 1988

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