137
Chapter 5 Block Diagram
Power Supplies
4
5
Power Supplies
The line voltage is filtered and applied to the main power supply. This 15
volt supply is always on when line power is applied to the waveform
generator. A regulator creates an earth referenced +3.3 Volt supply from
the main supply. This supply is always active when line power is applied.
A small microprocessor on the main board senses the power switch and
enables all other supplies. the main supplies are shown in the diagram
below.
Fan
Power On Control
From Processor
Main Power Supply
Line
Filter
110 - 240 Vac
+15 V
+3.3 V
+5 V
Earth
Referenced
Switched
Earth Referenced
Fan
Control
Isolated
Power
Supplies
+15 V
-15 V
+9 V
-9 V
+3.3 V
+5 V
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