Theory of Operation
Introduction/Theory of Operation B.1-5
2.11 Electrostatic Transient Protection
Electrostatic transient protection is provided for the sensitive components in the HHCM by diodes
VR0901, VR0921, VR0922, VR0924 - VR0929. The diodes limit any transient voltages to tolerable
levels. The associated capacitors provide Radio Frequency Interference (RFI) protection.
Radio Adapter PCB Cable HHCH Description
J0101 J0950 P0951 Connector J0901
1 18 18 1 - INT SPKR+ (NU)
2 17 17 2 - INT SPKR- (NU)
13 6 16 3 14 ANALOG 3
4 15 15 4 13 PTT
10 9 9 10 3 ANALOG 1
11 8 8 11 5 ANALOG 2
17 2 4 15 8 FLT A+
18 1 1 18 2 ON OFF CONTROL
8 11 14 5 11 LCD CLCK BUF
6 13 13 6 10 SPI DATA BUF
5 14 3 16 1 LED CLCK BUF
7 12 12 7 15 GND
16 3 10 9 12 MIC
3 16 6 13 7 HOOK
12 7 7 12 9 LED CE
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