Motorola EP450

11-32 UHF 438-470 MHz Schematic Diagrams, Overlays, and Parts Lists
November 24, 2003 HKLN4216A
1
2
DC Regulation
Q493
3
100K
R322
390pF
C301
100
R507
Q311
D301
C313
.01uF
150pF
C323
U330
TK71730S
BYPASS
4
CTRL
3
GND
2
1
VIN
VOUT
5
.01uF
R506
C304
10uF
C312
100
C302
390pF
10uF
C334
F301
3A
C333
.01uF
U310
TK71750S
BYPASS
4
CTRL
3
GND
2
1
VIN
VOUT
5
R310
100K
VR302
MMBZ5250B
20V
C316
1200pF
100K
NC
SHUTDOW
N
8
TA
P
3
R509
ERROR
7
FEEDBACK
2
GND
1
INPUT
4
OUTPUT
5
SENSE
6
C305
100pF
LP2986
U320
C331
.01uF
330K
1%
R320
10uF
1200pF
C321
R313
C315
R312
10K
HIGH
TAB1
6
TAB2
7
2
NC
20K
S444
SWITCH
4
1
LO
W
5
3
100K
R508
.01uF
C322
C303
33uF
Q494
2
6
4
1
3
.018uF
C320
Q313
.01uF
D3_3V
C306
Q312
.01uF
C310
R510
330K
D3_3V
.018uF
C311
NC
TP302
1
R321
1%
200K
C314
1200pF
D3_3V
20V
MMBZ5250B
VR301
NEG
POS
100K
R311
SWB+
BATT_CHARGE
NC
J301
DATA
D3_3V
3V
RESET
VOLUME
ON_OFF
5T
USWB+
RX_ENA
5V
TX_ENA
5R
Figure 11-25. UHF (438-470 MHz) PCB 8486348Z13-C Audio Circuitry Schematic Diagram