!
!
Meridian 3
16
5.2 Pow
e
r Board
PW
M
Co
nt
ro
l Ci
rc
ui
t
(L
ED
dr
iv
er
IC
M
P33
89
EF
)
Fee
dba
ck
C
ont
ro
l
Ci
rc
ui
t
Sw
itching
C
ir
cuit
( P
W
M
C
on
tr
ol
IC
&
M
O
SF
ET
)
Ou
tp
ut
(
+1
6V
) T
o
USB(
O
pt
io
n)
C
irc
ui
t
D
im
m
ing
C
ont
ro
l S
ign
al
(B
ur
st
m
od
el S
ign
al
)
D
iode R
ect
ifie
r
an
d
Fi
lte
r C
ir
cu
it
Dr
iv
er
C
ir
cu
it
( Full B
ri
dge
)
In
pu
t A
C
S
ou
rce
85
v /
6
0 H
z ~
26
4v
/ 50
H
z
Fu
se
F
or
O
LP
Co
nv
er
te
r Bl
oc
k
C
irc
ui
t
D
iode R
ect
ifie
r
an
d
Fi
lte
r C
ir
cu
it
R
ect
ific
at
io
n
Fe
ed
ba
ck
Co
nt
ro
l
Ci
rc
ui
t
A
bno
rm
al
P
rot
ec
t
C
ont
ro
l C
ir
cuit
Ma
in
Tr
an
sf
or
m
er
O
N
/ O
FF C
ontr
ol
S
ign
al
( 14
.5
v:
o
n /
0v
:o
ff
)
R
ectif
ic
at
ion
Inr
ush
Pr
ev
ent
ion
O
utp
ut
(
+5
V)
To
M
ain
bo
ar
d /A
ud
io *
2W
EM
I F
ilt
er
Ci
rc
ui
t
Ad
ap
te
r Bl
oc
k Ci
rc
ui
t
Di
m
m
in
g
Co
nt
ro
l
Ci
rc
ui
t
B+
D
iode R
ect
ifie
r
an
d
Fi
lte
r C
ir
cu
it
LE
D
panel
