THEORY OF OPERATION Section 3
Add to page 3-5, second paragraph:
.
.
.U1220 and U1321.
U1321 and anaociated componem2 me eliminated in Option 02
imfiumem2.
Switch SllOOB routes the signal.. .comprise the 30
kHz
low pass
filter.
7n
Opfion 02 imfiumed phuaing SllOOC
place^
the 22.4 Hz to 22.4 kHz
~dYm
in the aignd path. In the atanhd and 0pR;ion 01 inn&umeniz aLLLitch SllOOD
connects.
. .
Add to page 3-5, after the fourth paragraph:
I
Option 02 imfiumed have a high-p~a
~.ietm
compoaed od C1131 and R1230 which
dhive~ &o 3-pole
&Lt3m
in cancade,
Tkin high-pana d.ie-te~
.in
&&en though S1 100E
dhom the output o
6
U1220
OIL
U12
1
OR.
The 3-pole
~.ietm
me compoaed od U1230D and
U1230C Uh anaociated con1poneru2. U1230A phovid~ the KCCeAAatLy gain.
The output
od
tkin
&iXten.
.in
aurLtched to the inpuA:
06
U12308, an active @U-wave hectidieA,
via S1 100D. Thene active
&iLtm
phouide the phopeh henpome doh the
CC7R
WTG
@Ym.
The output dhom dull-mve hectidim U1230B panhen to pin
2
od U1 231. Tkin CiRcLLithy
hapidly chrurge~ C1331 to the pub value
06
the inpult waveborn.
Tkin pub voLtage
punen tClnough U1330A,
a low-pua
&iL.tm
with anaociated campone& and to the
+
in-
put
od U1330B. The peah poaiJtive voL&ge chmge~ C1431 though CR1332.
C1430
h
&o
chmged thhough CR1331.
An tlze peak voLtage dinappeann, C1431 aloLcley dinchatLgen
Xhhough R1430. The vo~ge acnoaa C1430 hemaim comtant untie the voL&ge achoaa
C1431 decaya to about 6.1
V
below the level on C1430.
Now C1430 dinchahga though
xhamhtoh Q1 330 ope.mLLng
an
a zeneh diode. Tkin CiRcLLltny aehven to delay a minimum
width peah
puRne doh
at
lmt
0.5 a. The pwipoae ad
th2
CiRcLLitrLy
h
to &ow puh
pdnu to be dinplayed on the digLtd headoult.
The peah voL&ge
h
amptidied via
U1330C and connected
;to
the conv&m output thhough Q1310 and U1310.
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