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STIJDtrR Rd/OX
c279
E 5/3
5.3
FUNCTIOI'IAL
DESCRIPTIOTT
r
OsciLLaton
r
Faden
stant
r
dbx
type
II
encoden
I
dbx
type
II
decoden
r
Phono
ampLifier
5.3.1
Osci
LLator
The 1000
Hz
osciILator is
inpLemented
rrith an
opamp
Icl/1
and
the
frequency
determining
eLements
R6,
R8,
and
c7
jn the positive
feedback path.
lilhen
the
stide suitch
S1
is in oFF position, transistor
01
i
s
conduct
ive
and
the
osc
i
I
Lator
i
s prevented
from
oscitLating.
A
controL
voLtage
for
amptitude
controL
(QZ, R5,
R7)
is
devetoped
in the
negative
feedback
path
via a
peak
recti-
fier (01,
D2,
C5,
R1).
tlith the inverting
opamp
IC1/2
the
impedance
is
converted
and the
signaL
brought
to
nomina[
teveL.
Hhen
sHitch
51
is
moved
to
+6
dBu
position.
Q3 becomes
conductive
and
the input
cunrent
Jnom
ICl/2 is doubLed, causing
the
output
voLtage
to
be
raised by 6
dB.
The output
voLtage can
be a[igned
Hith
trimmer
potentio-
meter
RA
'l
.
5.3.?
Fader
start
The
fader
start
Logic
is
identical for atL
input
units
and
the
master
unit.
In the
mixing
consoLe
the vottage
from
the faden
sLide
potentjometer
is
ampLi{ied
hy
a factor
of
1000
and
subse-
quentLy Limited.
Uhen
the {ader
is
cLosed
(-o) the
ne-
sutting
voItage
is
-12
V, transistors
0900 and
4901
bLock,
and
neLay K900 dnops
out.
I'Jhen
the {ader is
opened
a voltage
of + 0.5 V
is
suppLied,
the
tnansistons
become
conductive
and
the
faden
start
nelay
picks
up.
PR
99
FADER
START
CABLE 33229
TO EXPANSION
UNIT
FADER
START
CONNECTOR
FADER
START
CONNECTOR
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