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Figure 19.
STDES-EMETER1PV1 circuit schematic (6 of 8)
NEUTRAL MISSING SECTION
DGND
DGND
3V3
PA2_USART_TXD
PA3_USART_RXD
3V3
3V3
R11
100E,1W
Q11
2STR2230
3
2
1
C10
1uF
U4
DBLS208GRD
Plus
1
Minus
3
AC1
2
AC2
4
R106
220E
R109
1K
PD1
TX
1
2
C9
1uF
PQ1
RX
1
2
J3
CON2
1
2
U2
INS21829399
LDK220U33R
OUT
1
IN
3
G
N
D
2
G
N
D
4
R108
1K
D13
7V
3V3
PA3_USART_RXD
PA2_USART_TXD
IR SECTION
UM2898
-
Rev 1
page 18/31
UM2898
Schematic diagrams