1
O
u
tput
so
c
k
e
t (
B
N
C
)
In
p
u
t s
o
c
k
e
t (
B
N
C
)
In
p
u
t se
le
ct
o
r sw
it
c
h
Sc
re
w
s
fo
r b
a
tte
ry
c
o
m
p
a
rt
m
e
n
t
IC
P
c
o
n
s
ta
n
t c
u
rr
e
n
t L
E
D
>5
%
le
v
e
l i
n
d
ic
a
to
r
O
v
e
rlo
ad
in
di
c
a
tor
Ba
tte
ry
i
n
d
ic
a
to
r
Lo
w
p
a
s
s
s
w
it
ch
H
ig
h
p
a
s
s
/ i
n
te
g
ra
to
r
s
w
it
c
h
Ga
in
s
w
it
c
h
Fig. 1: Front view of Model M68D1 with control elements
