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20 Appendix E: Information on the Obsolete Tone Generator
The original version is the 302-491B, which is designed to produce the alert and evacuation tones and
speech messages required for an evacuation system to Australian Standards AS1670.4 or NZS4512.
Tones are digitally produced by microcontrollers for high stability and accuracy. Speech messages,
which may be installed on either or both tones, are microprocessor controlled but stored using the
Information Storage Devices (ISD) Direct Analogue Storage Technology (DAST). Outputs from the card
are low impedance to allow the card to drive 100 AMPAC EV3000 amplifiers (i.e. 40W and 120/240W).
20.1.1 Signal Generator Settings
SW 1 settings
Switch
1-1
1-2
SW 2 settings
Switch
1-1
1-2
EVAC SIGNAL /
SPEECH LEVEL
ALERT SIGNAL /
SPEECH LEVELS
Figure 32: 302-491B / 154-0076 Signal / Speech Generator
Off
Evacuation message off
Standard = AS1670.4
Off
Alert message off
Standard = AS1670.4
IC7
X1
LM7815
LED2
POWER
+
IC3
VR1
+
VR2
+
IC6
VR3
+
VR4
LED1
SYNC
302 4910B
On
Evacuation message on
Standard = NZS4512
On
Alert message on
Standard = NZS4512
IC2
IC8
IC1
LM7805
EVAC
SETTING
S W1
EVAC
MESSAGE
D1
IC5
+
IC4
ALERT
SETTING
S W2
ALERT
MESSAGE
Q3
LK1
TONE/SPEECH GENERATOR
MAN1813-9
CN1
c
a
2
4
6
TX1
8
Q4
10
Q5
12
14
16
RL1
18
Q6
20
22
TX2
24
26
28
30
32
52
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