6881094C31-E November 16, 2006
Theory of Operation: VOCON Board 3-33
Several components on the VOCON board protect the circuitry from ESD. The side connector signal
lines have ESD protection components on them since they are exposed. These protection
components include:
• 5.6-V zeners VR205, VR206, VR220, and VR221 on the SB9600 lines, RS232 lines,
microphone lines, and option-select lines
• 12-V zeners VR201, VR203, and VR209 on the internal and external speaker audio lines
• 13-V zener VR204 on the OPTB+ line
• Low-capacitance ESD suppressors D203, D204, D205, and D206 on audio lines, USB data
lines, and option-select lines
There were also several protection diodes on lines connected to the Flipper IC. These include D302,
D303, D304, D305, D306, D307, and D308. ESD protection for the battery status line is provided by
a 5.6-V zener VR501.
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