Farnell TSV70 MK2 - 6-10 User Manual
g_ESEI9N__U_L_
CIRCUIT
The
bridge
supply
rectifler,
consists of a maLns
.reservoir
systems
On the 35 volts
systems
bank
main
range
The
driver
control
the outputs
upper
board No.
board No.
35 Volts
l{alns
secondary wJ.ndlng. MR2
secondary. The
22 are
F'2,
S3. The
W17-23
of reservoir
current
output
regulator
outlrut
paralled
Diodes DI
winding
This
ZI
-
O
circuitry.
connected
swltch
terminal.
terminal. The
The control
provides
22
and
-IO
-
paralled
are
inputs
cl,rcuit board No.
system is
I, and the
2.
r
1O Anps R,ANGE.
Transformer
DlD,
positLve
to
the
monitoring
transistors VT24
by SfA.
and D2,
MTl
on
whlch
Volt supply
current
positlve
capacitors
and
an
are fed
1O amps range
by
paralled
are
the
of
drlven
lower system Ls
lffl
negatlves of reservolr
to the negative
is connected vla
resJ.stor R67
posltlve
The
lnput bases
cLrcult
Rl
and
feed
unstabillsed D.C.
for
DESCRIPTION
transformer feeding
capacitor
the outputs of the
switch
S1.
.The
by SIA and
l. On
two systems
from
the maln
are
drlven from circuLt
feeds !!RI
ls fed
monitorlng
output terminal.
C25 and
-
of circuLt
which
reservolr
via
the reference
from a
26 are
and swl-tch
is
30
and swltch
are fed
R2.
fr6rn
output
reslstor R57,
serles regulators
connected vla serLes
of
.
board No. I
capacitors Cl and C2.
supply for'zener diodes
ZL
and 22
and series regulator
two
serles
driven
7O volts
the
connected
regulator
from
5 amps
Ln
serles.
the
control cl-rcult
a 37V
second
capacltors C2l
terminal
The
connected
53 to the negatJ.ve
SIC
\j1lL7
and
from a 36-O-36V
and controL ampllfler,
R.M.S.
37V
vLa fuse
and switch
negatives
via fuse
to the
\/T2{
consists
provlde
R.M.S.
posltive
are
+I5
a
and
tsro
.1
F3,
of
VT4, RII-,
source which
externally. 7,3 is the maln
provLdes
connected to the
PI
the front
Pln
and
via R16
A2
and
anpllfter \215,
drives
connection
the thermal-
R111
base of \/1117
acts ln
on
+5.1V
a
and P2
panel
17
on control cl.rcuit
to VT5
R8 forms
the serles regulator
belng from
circuit bbard
such a sense as to
24,
RI4 and RI5
feeds 23,
source
+
are the
and are connected
base.
the output voltage
6, 8, 9, LO
trlp
TTl
via SIA to
and
R8
wlth
SENSE front panel
coarse
A
Ptn
Pl.n
to
No.
and T2,
potentlal
drLves
13
2
oppose any
comprlse
plns
reference
respect
and flne voltage
bctween:the
board
dlvlder
genslng.
emittar follower
banlcs
on the circult. board No. I
9 on
to PLn 1O
the
W17-23 and W24-3O.
circult board 2 then
base of \l1I24. The control loop
4-
a constant current
3
zener diode
Pln
to
termlndl.
No,l..' Pin
and
signal
18 belng
and
whlch
I1
controls on
"-SENSE[
comprlsJ"ng
The.control
from
there to the
change
I7
linked
and
ls
is
connected
Pl,
\/1[7.
via
on VT5
temlnal
P2,
Thls
The
via
base,
and
The
hence
output
maLntalns
voltage
zero
Vo
voltage
ls
therefore
between
defLned
\l1t5
as:-
\i1t6 bases.
and
-
Overload
T4 ln
parallel
connected
current
blased
the
becomes
\i1I12
At
thls
Ls low,
off and
voltage
nore
ls sufflltently
polnt,
O6 becomls
drlves
VT9 fufther
avallable
to the
to emltter
protectLon
is connected
IO
the
\/Tl,2
across
posJ.tive.
the
fonpard
regulator'transistors.
\l1I5 to
voltage,
control
and
Lncrease
current
supply
f Git-
constanl
and
and
now
1S
load,
of
renains
ls therefore
set by
P3,
current
constant.
the
Vo
|s
volt
auxllLary
voltage
blased
is
R49
increases,
This contLnues
positive
voltage
bLased,
into
conduction,
follower
Thls
driven off.
be
taken over
output
the
constant
front
loads in
for
=
Vz3
'
(R8
R8.T2
provlded
R49 and to
to
across
on.
and the
cause
to
across
and
R3O begins
feeds
VT7 and
actlon
\IfIl
by
voltage
The output
voltage
panel
current
excess
(Pl
+
by
T2).
\i1IL1
+
and
VT12 base.
raiL.
R49 Ls
As outPut
When
}ow.
current
voltage
untll
the
\l1lll to begln
to
current
]|ml,ts
and
to
the
hence to the
causes
a fa1l
D5 then ceases
W12.
and
falls,
and. output
characterLstl'c
for
loads
llmlt
of
less than
potentlometer
the
P2)
L2.
P3
R33 ls
the output
\l!t|lL
|s
lncreases
VT12
at
base
of
conduct.
to
Lncrease
\IF'9 base.
drlve
series
output
ln
conduct
to
further
On
of
llmlt.
with
base
until
Thls
the
the
volts 5
70
wlth
posLtives
infZ-Zf
and,
C2L
ooipot
of
to the
22
regulators
of
are'connecte[
and,
"i.
22 as
fog.
above.
F3, reslstor
termlnal.
tnput
the
board
to
tto.Z,
connected
regulators
regulators
The
volt
35
current
circult
of
1O
llmlt-
regul.ators
"oii.g".
reseriolr
windlng
Thls
and
piovides
conslitlng
\l1I1O4
ls
drives
connected
ls connected
amps
swltctr
Ranqe.
sl
ln
capacltors
iosttive
ionnected
"re
\i!t24
.1ti"
r"golators
The
'J.nput
The
regulitors
via SlA.
series
in
wL7-23,
and
and
W24-3O.
function
arnp
of
range,
contioi
board
w24
D1O3
capacitor
-supplying
of
No.2
and
+fO
l-
wlo}
output
30
IO4r-and
system
Loz,
,
serles-reguiators
oulput
the
to
centre
the
to
70 volts
the
C2I
artd,22
output
vJ.l
30.
negatlves
R67-,
to
and
regulators
rf:fT24
Thus
circult
clrcult
cl-rcult
thls
and
the
of
merely
ls
at
fed
D.C.
g -
voltage
-5
1O3,
of
of
are
terminal.
fuse
F2,
thgrpositlves
lqu"T24
of
switch
is
30
to
two
the
board
board
board
the
ls
suppJ.y.
hold
to
half
ClOl
are
from
volt
supply
anrd
VT24-3O.
thts
potentlal dlvlder
the
5 arnps
connected
switch
and
the
to
30
and
C25
to
53
W17-23
from
regulator
No.I
No.2
No.l
ls the
nraster
The
the
ternlnal
the
fuIl
a
a 36-0-36
fo
?trOl
for cont,rol--amPllfler
emltter
'The
regulatdr
p.osition,
regulators
via
negatives
The
to
SID
C25
of
negatlves
connected
are
26
negatlve
the
as before,
ls
circuit
12,
Pin
systems
controls
controls
voltage
control
voltage
the
the
same
as
and'
clrcuitry
at
output
wave
rectifier
volt transformer
?'LOz
and
follower
base
and
vLa
w1o4.
of
VT1O2
R113 and
the
the
and
of
output
are
upper
loqter
on
RlOl'
VTIOl
base
of
26
C2L
and
the
5
Loading...