NUCLEONIX SYSTEMS GA720 - Page 20

17
MCU
P89V51
RD2
Buffer
16x2 LCD
Display
Multiplexed
Display
Driver
4 digit 7
segment
display
Buzzer
(Audio Alarms)
Visual Alarms
(Active/Normal)
LEDs
Relay Driver
Relay Board
(2 c/o contacts)
17 pin MS
Keypad
EEROM
RS485 to
TTL
6 digit
counter
4 ch
ADC
+18V fract
+5V fract
Power Supply
+5V +18V
Transformer
9V rms
20V rms
9V rms
~
Main Board
-ve tail to TTL
convertor
TTL to
RS485
HV
(500V @ 50
mA)
HV fract
+5V
+500V
Detector Probe
GM Detector
LND 71210
+500V
230V AC
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