Filter
Top Products
T
h
eo
r
y
ο
1
Op
e
r
atio
n
-
ΤΜ
5006
The
p
ositive
goi
ng ou
t
pu
t
pu
lses
fro
m
t
h
e
cloc
k
oscillato
r
c
h
a
r
ge
C2150
to
about 9
.5
V
t
hr
o
u
gh
C
R
2042
.
Wh
en
t
h
e
p
ositive
pu
lse
at
p
i
n
4
of
U1
8408
d
rops
to
0
V,
C2150
d
isc
ha
r
ges
t
hr
o
ug
hR
2050
cau
si
ngα
falli
ng
r
a
mp
wavefo
rm
of
abou
t
50
mV
p
ea
k
-to-
p
eak
am
p
lit
u
de
to
app
ea
r
at
p
i
n 4
of
U
2140A
.
T
he
+8
V
fr
o
m
t
he p
owe
r
supp
ly
o
u
t
pu
t
is
a
pp
lie
d
to
voltage a
dju
st
pote
n
tiomete
r
R
2151
.
T
he
voltage
on
p
i
n
4
of
U
2140A
is
+7
.15
V,
t
he
r
efe
r
en
ce voltage
ge
n
e
r
ate
d
in
02250
.
Also,
on
p
i
n
4
is
α
n
egative
goi
ng
40
kH
z
r
am
p
,
as
pr
evio
u
sly
d
esc
r
i
be
d
.
T
h
is
r
a
mp
is
ac coup
le
d
to p
i
n
4
t
hr
o
u
g
h
C2140
.
On
t
he
r
isi
n
g
ed
ge
of
eac
h
cloc
k
pu
lse,
t
he
r
a
mp
goes
p
ositive
r
ap
i
d
ly
.
P
i
n
2
of
U
2140A
is
low
.
At
so
m
e
p
oi
n
t,
dur
i
n
g
t
he
r
a
mp
d
ecay,
t
he
ramp
voltage
a
nd
t
he
feed back
voltage
at
p
i
n 5 a
r
ee
qu
al
.
At
t
h
is
p
oi
n
t,
p
i
n
2
goes
h
ig
h
,
ter
m
i
n
ati
ng
t
h
e
d
rive
pulse
t
hrou
gh
t
h
e
logic
ci
r
cuitry
.
T
h
e
h
ig
h
ert
he out
pu
t
voltage,
t
he
ea
r
lier
i
n
t
he
r
a
mp
cycle
p
i
n 2
goes
h
ig
h
.
Overvoltage
a
nd
Ove
rc
u
rτ
ent
Detecto
r
s
P
i
n
11
of
U
2140D,
t
he n
egative
over-voltage-detector,
co
nn
ects
to
α
voltage
d
ivi
d
er
b
etween
t
h
e
-26
V
s
upp
ly
a
nd
t
he
refe
r
en
ce
+7
.15
V
.
Shou
l
d
p
i
n
11
go
more
n
egative
t
ha
n p
i
n
10,
p
i
n 13
goes
low
s
hu
tti
ng
off
t
he
ou
t
pu
t
.
T
h
e
i
npu
t
of
U
2140D
is
p
rotecte
d
fr
om
α
n
egative
voltage
b
y
CR
2130
.
Pr
ima
r
y c
urr
e
in
ou
t
pu
t
t
r
ansfo
rm
e
r
Τ
1710
flows
through
T1750
1
.
Th
e
seco
nd
a
r
y
voltage
of
T1750
is
pr
op
ortio
n
al
to
(h
e
p
ri
m
a
r
y c
urr
en
t
.
T
h
e
seco
nd
ary
voltage
of
T1750
is
r
ectifie
d
b
y
C
R
1860,
CR
1861,
C
R
1862
a
nd
C
R
1863
and
ter
m
i
n
ate
d
in
R
1860
.
Wh
e
n
t
he
pr
i
m
a
r
y
c
urr
e
n
t
i
n
Τ
1750 exceeds
t
he p
oi
n
t
w
h
ere
t
he
voltage
at
p
i
n
6
of
U
2140
B
excee
d
s
t
he7
.15
V
refe
r
e
n
ce
at ρί
η
7,
pin
1
goes
low
t
urn
i
n
g
off
t
h
eo
u
t
pu
t
tra
n
sistors
via
t
h
e
wait
mu
ltivi
br
ato
r .
T
he
+26
V
is
a
pp
lie
d
t
h
ro
ug
hR
2231
a
nd
C
R
2240to
p
i
n
8
of
U
2140C,
t
h
e
positive
over voltage
d
etector
.
T
h
e
+8
V
is
also
applied
through
R
2130
a
nd
CR2230
to
p
i
n 8
.
P
i
n
9
of
com
p
a
r
ato
r
U
2140C
co
nn
ects
to
t
he
+7
.15
V
r
efer
en
ce
voltage
.
If
p
i
n8
of
U
2140C
goes
mo
r
e
p
ositive
p
i
n 14
goes
low
.
T
h
is
actio
n
t
r
igge
r
s U
1940A
t
h
e wait
m
ultivi
b
rato
r
,
t
u
r
n
i
n
g
t
h
e
s
upp
ly
off
fo
r
ab
o
u
t
3
second
s
.
T
he
soft
start
cycle
follows
.
T
h
is
n
egative
goi
ng
pu
lse
is
ti
m
e
delaye
d
b
y
R
2040
a
nd
C2052
.
Wh
en
+10
V
is
app
lie
d
at
p
owe
r
up,
C1940
h
ol
ds
pin
3
(clea
r
)
of
U
1940A
low
fo
r
α sh
ort
p
e
r
io
d
.
T
h
is
ove
r
-ri
d
es
t
he
Α
and
Β
inpu
ts of
U
1940A,
ca
u
si
n
g
p
i
n
6,
t
h
e
0
o
u
t
pu
t,
to
r
emai
n
low
.
Ove
r
-voltage
or
over-current
ca
u
ses
α
low
at
p
i
n
4
of
U
1940A
cau
si
ng
one
h
ig
h
level
pu
lse
of
abou
t
3
seco
nd
s dur
ation
at
p
i
n6
.
T
h
is
3-seco
nd pu
lse
dur
atio
n
ti
m
e
is
d
ete
rm
i
ned b
y
C1930
a
nd
R
1931
.
T
h
e
cloc
k
pu
lse
r
et
r
igge
r s
U
1940A
if
t
h
e
fa
u
lt
persists
.
T
he pu
rp
ose
of
C
R
1950
is
to
d
isc
ha
r
ge
C1940
w
he
n ac
powe
r
is
remove
d
fr
o
m
t
h
e
s
upp
ly
.
N
oise
f r
o
m
t
he
li
m
it
ci
r
cuit
r
y
is
filte
r
ed by
C2052
.
Co
n
t
r
ol
C
i
rc
u
it
R
egulato
r
The
16
V
ac wi
nd
i
n
g
on
Τ
500
is
a
pp
lie
d
through
F
2340
to
r
ectifie
r
d
io
d
e
C
R
2341,
w
h
ic
h ch
a
r
ges
filte
r
cap
acito
r
C2260
to
a
pp
roxi
m
ately
20
V
.
T
h
e
+20
V
is
a
pp
lie
d
to
voltage
reg
u
lato
r
U
2250
.
T
h
is
r
eg u
lato
r
ou
t
pu
ts
two
voltages
:
+10
V
wh
ic
h
is
use
d
t
hr
o
u
g
hout
t
he e
n
ti
r
e
s
upp
ly,
a
nd +7
.15
V,
α
r
efe
r
ence
voltage,
at
p
i
n 6
.
T
he
line
d
etecto
r
ci
r
c
u
itry
is
co
mp
ose
d
of
C
R
2340,
C2350,
02240
a
nd
associate
d
co
mp
o
ne
n
ts
.
Wh
en n
o
rm
al
li
n
e
voltage
is
a
pp
lie
d
,
t
h
e
voltage
ac
r
oss
C2350
is
appr
oxi
m
ately
20
V
.
Tra
n
sistor
02240
is
on
a
nd
p
i
n 2
of
U
2250
is
a
bo
u
t
0
.2
V
a
b
ove
g
r
o
und
.
If
a
b
out
two
cycles
of
li
ne
voltage
a
r
e
misse
d
or
t
h
e
li
n
e
voltage
goes
low,
02240
no
lo
n
ge
r
sat
ur
ates
.
T
he
collector
of
02240
r
ises,
d
isa
b
l-
i
ng
t
he
se
r
ies
p
ass
t
r
an
sisto
r
locate
d
i
n
te rn
ally
i
n
02250
.
T
h
is
series
p
ass
t r
an
sistor
is
effectively
co
nnected
b
etwee
n
p
i
n
s
11
a
nd
10
of
U
2250
.
T
he
+10
V
is
r
e
m
ove
d
fro
m
t
h
e
p
owe
r
supp
ly
dur
i
n
g
li
ne
dr
o
p
o
u
t
to
pr
even
t
d
isc
h
a
r
ge
of
t
he
m
ai
n
filter
ca
p
acito
r
s
i
n
t
h
e
o
u
t
pu
t
stage
.
P
ositive
fee
db
ac
k
is
pr
ovi
ded
t
hrou
g
h
R
2241 tothe
b
ase
of
02240
to
im
p
rove
t
he
switc
h
i
n
g
actio
n
.
T
he
PWR
sig
n
al
circ
u
it
r
y
(02160)
pr
ovi
d
es
α
sig
n
al
to
eac
h
com
p
art
m
ent
i
n
t
h
e
power
m
o
du
le
to give
power
s
upp
ly
stat
u
s
i
n
fo
rm
atio
n
to
t
h
e p
l
u
g-i
n
s
.
See
t
he
r
ea
r
i
n
terface
i
n
for
m
atio
n p
art
of
t
he
M
ai
n
te
n
a
n
ce
sectio
n
(Sectio
n
5) of
t
h
is
ma
nu
al
fo
r
ti
m
ing
i
n
for
m
atio
n
.
P
i
n
7
of
U
2160
goes
low
w
h
en
t
h
e
r
isi
n
g
voltage
at
p
i
n
s
2
and
6
reaches
2!3
of
t
he
value
of
t
h
e
voltage
co
nn
ecte
d
to
p
i
n
4
(+1
V)
.
P
i
n
7
of
U
2160 conn
ects
to
t
he
b
ase
of
01525
.
T
h
is
t r
a
n
sisto
r
i
n
verts
t
h
e
sig
n
al
fro
m
p
i
n 7
to
t
he
ρΙυ
ιη
co
mp
artme
n
ts
.
Wh
e
n
th
e
li
n
e
p
owe
r
goes
low
o
r
off,
p
i
n
13 of
U
2250
goes
low
.
T
h
is
actio
n
r
aises p
i
n
7
of
U
2160
t
u
r
n
i
n
g
off
t
he
PWR
sig
n
al
.
P
i
n
7
of
U
1940A
is
also
low
dur
i
n
g
t
h
e3
seco
nd
wait
state
.
T
h
e
cat
h
o
d
e
of
C
R
2150
is
pu
lle
d
low
w
h
ic
h
tur
n
s
off
t
he
PWR
sig
n
al
.
T
he
soft
start
feat
ur
e
also
co
n
t r
olst
he
PWR
sig
n
al
.
T
h
is
is
acco
mp
lis
h
ed
t
hr
ou
gh
R
2061
.
Wh
e
n α
fa
u
lt
occ
u
rs,
p
i
n
6
of
U
1940A
goes
h
ig
h
.
Wh
en
t
h
e
fa
u
lt
is
r
e
m
ove
dp
i
n6
of
U
1940A
goes
low
cau
si
n
g
p
i
n
8
of
U
1840D
to
go
h
ig
h
.
As
t
h
e
voltage
at
t
he
j
u
n
ction
of
R
2061
and
R
1953
goes
h
ig
hp
i
n
s
6a
nd
2
of
U
2160
also
go
h
ig
h
cau
si
n
g
t
he
PWR
sig
n
al
to
go
h
ig
h
.