AMEK Mozart - Free Audio Schematics

AMEK Mozart
Table of Contents
MZls-RN lnput module
General
l
g-l
g-
Clrcult descrlptlon: Channel Path
.
.
LineAmplilier
lnputReverse
MicAmplilier
8-1
B-1
g-1
Flg&1 MZ15-RNlnputModuleandSub-.assemblies 8- 1
PhaseSwilch
lnsertPoint
Filters
Equaliser
OverloadDetector
ChannelMute
Channel Fader
VCA Subcard PC710
Flg &2 MUTE Molex Connector
BYPASS System Operation
ChannelPanpot
GhannelstereoAssign
Flg &3 VCA Bypass Btock .
MlXRelay
soLo
Clrcult Descrlptlon: Monltor path
Buss/TapeReturn
MelerOutput. . .
MonilorMute.
1
8-2
g-z
g-2
g-3
g
-3
I -3
8-g
8-4
8-4
g
-4
I -4
B-5
. 8-5
BussMixer
BussDriver
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g-z
8_5
32 Track Routing
iL
B-z
Table of Conlents
g-5
g-s
.
g-6
g-6
g-6
8-6
AMEK Mozart
e';
Monitor Fader
B-6
Monitor Panpot
8-6
8-7
8-7
Monitor Stereo Assign
Monitor
Solo
.
Auxiliary Send Pre-Post Mute Jumper
B-7
Mono Aurlllary Sends
8-7
Aux 1-4; Aux 9-12
8-7
Auxiliary Mute
8-7
Auxiliary Pre-Post and To Monitor Switching
8-7
Stereo Auxlllary Sends
8-8
5-8;13-16
8-B
Stereo Auxiliary Buss Assignmenl
B-8
.
Stereo Auxiliary Mute
8-8
Stereo Auxiliary Pre-Post and To Monitor Switching
8-8
Aux 7-8 Mono
8-8
Aux 7-8 Monitor Fader to Aux
8-8
Aux 7-8 to Multitrack
8-9
ChannellogicControl
..
8-9
.
Qulck Check Gulde
8-10
MZ15-RN Block Diagram
8-12
Schematlc Dlagrams PC712
S|DE)
PC712 Component Relerence (RH S|DE)
PC712 Conneclor Pinout Details
PC712 Mic Amplilier
PC712 Component Relerence (LH
PC712 Line Amp; Mic Trim / Line Gain; Buss / Tape
B-
I
Al
- Az
B - A3
8 _ A4
Gain
Feed
PC712 Filter Switching; Phase Reverse Switching
PC712 Equalizer Switching; Equatizer pots
PC712 Insert Send and Return
PC712 Buss Relurn;Tape Return;Meter
B - A5
g _ 46
B _ A7
8 - Ag
B - Ag
PC712 Channel Mute; Overload Detector; Aux "pRE,, Source g - 410
PC712 Fader Reverse; Channel and Monitor
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Table of Contents
panpot
g - A11
2
AMEK Mozart
PC712 SOLO; Monitor Mute; Monitor Stereo Assign
8-412
PC712 Auxiliary Sends 1-4;9-tZ
8-A13
PC712 Auxiliary Sends 5-8; 13-16
8-A14
PC712 Mix Anplilier;Buss Driver
8-A15
PC712 Odd Track Assigns
8-416
PC712 Even Track Assigns
8-417
PC712 Automated Switches
8-418
PC712 ASIC Switch Latches 1€
8-A19
PC712 ASIC Switch Latches 9-16
B.A2O
PC712 SEL Switch Logic; CHECK Logic
8-A21
PC712 Power Distribution
8-422
PC712 ATB Hybrid Line Driver
8-A23
Schematlc Dlagrams PC71 3
PC713 Component Reterence (LH S|DE)
8-81
PC713 Component Reference (RH S|DE)
B-82
PC713 Connector Pinout Details
8-83
Schematlc Dlagrams pC731
PC731 Component Relerence and pinout
8-Cl
Schematlc Dlagrams pgTtg
PC779 Cornponent Relerence and pinout
8-D1
PC779 Equalizer Circuit Diagram
8-D2
Schematlc Dlagrams pCTt
O
PC710 Component Reference and pinoul
B.
E1
PC710 Mono VCA Circuit Diagram
B.
E2
e3
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Table of Contents
3
AMEK Mozart
MZ|s-RN lnput module
General
The
5 is
MZ- 1
an
input-output or "in line'
rnodule, consisting of a
nAnAnAn
PC712 main card,
PC779 equaliser card,
PC731 multilrack routc.',
PC713 switch card and
PC710 VCA card il fitted
with aulomation.
{:
Fig
It has two signal palhs,
&t
MZ|5
-RN lnput Module
aN
Sub-assenbties
one termed the channel path, the other the monilor palh.
A comprehensive routing system allows the microphone, line, buss and tape inputs and other
module leatures to be swilched between these paths. Several of the switches can be controlted
by the switch group maslers ancUor the automation system.
Note
The internal operating level is -SdB relative to externat inputs and outputs.
Circuit description: Channel Path
Mic amplifier
The microphone input is f itted with a "Dl" swilch providing 30dB anenuation with corresponding
impedance adiustment and r.l. filter. The mic amplifier has an adjustable range ol OOOA via
rotary switch with 6dB steps.
i
Line Amplifier
The line amplilier is electronically balanced with a gain ol -3dB and is toilowed by the mic/line
selector swilch and a variable gain stage of +/-10d8. This stage provides an adjustable input
range when the line amplilier is selected and a leveltrim when the mic input is selected.
lnput Reverse
A quad single pole single way analogue switch (U5) selects the source to the channet and
monitor paths. Normally the Mic/Line input is routed to the channel and lhe Buss/Tape return
to the monitor path.
This arrangement is reversed by control signal "lP-REV-C". The signalto the channel path is
buffered by U9. The signal to the rnonitor path is butlered by the firit part of U11 and inverted
by the second half of U11 to produce the required polarity.
Because the two buffer amplifiers are operated as virtual earth inputs, it
is not pssible to
measure the switched outputs of U5 directly. This can be achieved by unpiugging the
€.J
appropriate following buffer amplifier.
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MZ|5-RN lnput Module
8-1
AMEK Mozart
8
Phase Switch
Phase reversal ol the signal is achieved by inserting a unily gain inverling amplilier (U11 on
the PC779 sub-card) into the signal path. Normally this is bypassed by switch S37.
lnsert Point
The 'INSERT PRE'saritch (S25) moves the position ol lhe insert between pre and post the
Filler/EQ section. The insert send amplifier (HY1) is an ATB hybrid circuil with a balarrced
output, conligured to have a make-up gain ol 3dB. The inserl return is a balanced input stage
with -3db gain overall.
The output of this amplifier or the leed lo the input of the insert send is selected by U15 (a triple
two input demultiplexer) in order to switch the insert point in and oul ol circuit.
The output ot the insert sed is not atfected. The signalfrom the 'INSERT IN-OUT' switch is
buflered by Ul4 (a untg gain, virtual earth input stage).
Filters
The lilter section comprises two slages (Hl-Pass and LO-Pass) which can be individually
switched in and out ol circuit. Additionally, lhe whole lilter stage can be saritched between the
channel and rnonitor paths. The -3dB (half-power) points ol the lilter sections are 120H2 and
'l0kHz, with a rollofl rate ol 12dB/octave.
Equaliser
The equaliser section consisls of lour biquad sections, with the tollowing characleristics:
HF: Freq sweep 500H2-20kHz shelving with a Q ol 0.5 when BELL is selected. Cut and boost
is +/-18dB.
MF1: Freq sweep 350H2-1SkHz with a Q variable from 0.5 lo 10, or switchable between 0.75
and 2 using the HIGH-Q switch. Cut and boost is +l-14dB.
MF2: Freq sweep 40Hz-2.5kHz with a Q switchable between 0.75 and 2 usirq the HIGH-Q
swilch, or variable between 0.5 and 10 using the Q control. Cul and boost is +/-14dB.
LF: Freq sweep 30Hz-2.SkHz or with a Q ol 0.5 when BELL selected. Cut and boost is +/-1 8dB.
The Equaliser stage can be switched between the channel and monilor paths in two blocks of
the HF and LF seclions ancUor both MF seclions. The entire stage can be bypassed by the "Ee
lN'relay (K1). This is mntrolled by the EO-C logic signal.
Overload Detector
The output of f he "INSERT PRE" switch leeds the overload/law generator which comprises a
rectilier stage followed by a non-linear DC amplifier. The output of the amplifier is timited by a
zener diode and available on connector J1.
An unlimited output ol the amplilier is fed to the overload delector. This is compared to the O/L
REF voltage by U20 which drives lhe overload LED via Q3. The O/L REF voltage is +€.9 volts,
which corresponds to an overload levelol +14d8.
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MZ|s-RN lnput Module
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AMEK Mozart
Channel Mute
f}---j-
The output of the "|NSERT pRE" switch feeds the mute
elemenl U16 (4053) which loltows controt tine
'MUTE-ALL' via Og (2N3904). This is an automated
LF-
sritch lunction.via the ASlCs.
3
[j-
+
The channel audio signal is switched at virtual potential
and butlered by one hall ol lollowing stage U18 before
feeding the fader reverse sryitch (S4S).
L
The channel mute switch is litted renntely to the lader
paneland connects directly to the PC712 main pcb via a
2
l:-
Hg &2
5
MUTE-xx
MUrEo
+sV
ocNo
MUTE tuhlexComcclor
5 pin Molex.
{-}
Channel Fader
The channel and monitor faders can be exchanged between the channel and nnnitor paths
using the "FADER REV'swilch.
The VCA (sub-assembly PC710) acts as the main audio laderwith a variable DC vottage from
the channel lader wiper on ils control input.
ln Bypass mode, the VCA is disabled and the audio is routed direcily via the channel lader
element.
The fader element is fitted reffotely to the MZgA panetdirectly betow the MZ\S-RN module
to PC7l2 via the motherbard edge conneclors.
aN annects
VCA Subcard PC710
The 710 VCA card uses a qqoprietary VCA device (DBX 2151), the associated control circuitry
and the BYPASS system. The VCA has a typicalgain range ol OdB to -90d8, controlled by th6
DC input on pin 3.
The VCA distortion (symmetry) is optimised by presets VR1 and VR2.
Each half ol amplifier U4 buflers the audio output ol the VCAs and provides a presel adjustment
to give an overallmaximum gain ol unity.
The control voltage lrom the lader wiper, via the digitiser and computer, is led to U2 on the
"VCA" input.
"VCA-EXT" and "DC-OUT" are not used at present.
The second stage of U3 fitters, scales and limits the rate ol change of the control voltage.
The "BYPASS-C" signal originates lrom the ASIC and can be setected by the grouping
compuler.
Note
ByPASS is the default @ndition when the automation system is disabled.
Ib
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MZlS-RN lnput Module
8-3
AMEK Mozart
(i
B
YPASS Syste m Operatio n
The VCA can be bypassed either by selecting BYPASS rnode or by lailure ol the computer
power (C+5V).
When BYPASS mode is selected BYPASS-C
When the computer power lails C+5V = "0'
='1"
Q3 provides a constant qJnent of approximately 40mA for the relay coils which are energised
wilh 4.5V across each. A
logic "!" on BYPASS-C willturn Q1 and Q2 ofl altowing the relays to
be energised and select BYPASS mode. A togic'0'on BYPASS-C willtum on Oofr e1 and
Q2 reducing the voltage across the relays.
The collector resistor tor Q2 limits the reduction in voltage across the relays so that they just
drop oul, giving quieter mechanical operation.
lf lhe computer power fails or is not connected, both
to BYPASS rnode.
lj
Ql
and Q2 turn off and the relays switch
l, the chassis is lully loaded at a laterdale, the extra PCTZS card must be replaced by an input
rnodule.
AUDIO OUT
AUDIO IN
FROM DIGITISEB
TO DIGITISER
AUTOMATION +5V
AUTOMATION GND
AUOIO GND
Channel Panpot
The outputs lrom the lader section ,eeds the pan pot which is configured to have a -3dB cenlre
position. The outputs ol the pan pots are buflered by vottage followers U30.
The pan "lN' switch allows the pan pot lo be selected in or out ol the circuit as required.
Channel Stereo Assign
Pan bulfers U30 leed lhe channel slereo assign switch
near the multitrack routing block.
'ST' siluated
at the top ol the module
The stereo assign swilch is litted wilh an indicator LED and leeds the post pan L&R channel
signals onto slereo vidualearth busses'L Hl" and "R Hl".
Note
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Corresponding ground sensing busses "L LO" and'R LO" are switched simultaneously.
1
MZlS-RN lnput Module
8-4
AMEK Mozart
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MIX Relay
Mix relay K2 assigns the 32 track routing block between the channel and rnonitor panpot
outputs. ln "RECORD'rnode the routing block lollows the channelpanpot, in'MtX. mdOe ine
routing block lollows the monilor panpot.
Note
The Mlx relay operates in anjunction with the INPUT REuERSE function uNer automatbn
antrolvia the AS/Cs.
PFL
The outp.rt ol lhe 'lNsERT PRE- swilch feeds the internal PFL-AFL s,vitch s27. switch s27
selects between PFL or stereo AFL (lrom the channel pan br.rtfer outputs) and presents the
presel signallo U42, a tdple elernent analogue switch.
soLo
U42 lollows conlrol line'SOLO-C'which is derived lrom the channel SOLO button. When
operated, the preset PFL-AFL s(Tnallrom S27 is swilched directly by U42 onto the,SOLO L
Hl'and'SOLO
R Hl" virlualearth busses.
conespnding grouN sensing busses 'soLo L Lo" aM 'soLo
sirntltaneously by part ot U42 and paft of lJ7 (bth 4053 devbes).
Note
R Lo, are switched
32 Track Routing
The output ol MIX relay K?leeds a set of 8 pairs of multilrack send switches at the top of the
rnodule. These are arranged such that odd numbered sends are ted lrom the L pan signal and
even numbered sends are led lrom the the R pan signal.
The bank select switch (S9) allows the routing swilches to address brusses 1-16 OR busses
17-32.
Note
add numbered switches and the bank switch are contained on routing sub-assembly pC73t.
Buss Mixer
The buss mix amplilier is conligured lrom U17 and U18 (MC33078) with a clean ground
reference lrom the'REFGND" buss via J3.
lnternal switch S28 selecls the mix amplifier input between the channel post lader output
and
an exlernal virtual earth buss.
For modules filted to positions 1-32 the normal mode is "off buss" providing the necessary
summing ampliliers lor the 32 track buss syslem. Virtual earth buss signaliare individually
wired to each rnodule posilion on the rnotherboard underside.
Buss Driver
The buss driver amplilier (HY2) is a custom hybrid AT8 design and provides the electronically
balanced buss output configured with +3dB gain to replace the -3dB internat operating level
loss.
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MZls-RN lnput Module
8-5
AMEK Mozart
The mix amp spnalis rouled to lhe driver stage via trimmer R199 allowing the buss outprlt to
be calibrated. The buss lrimmer is extemally accessed via the lacepanel.
Orrtprrt CMRR may be adjusted via R200, however this is lactory preset and should not require
any further adjustment.
Circuit Description: Monitor Path
Buss/Tape Return
The Tape and Buss return inputs are kJenlical eleclronically balarrced input ampliliers wlth €dB
gain. The outprrts ol these two stages leed a quad single pole single way analogue switch (U6)
to give A/B (BusYTape) selection.
The switch status is determined by the control signal 'AIB-C'. The output ol the swilch is
buflered by U'10 and lhen leeds the BusVTape retum gain stage which has an adjustable range
ol +/-10d8.
Meter Output
The output of U10 is also laken via the "Meter Ofl Channel' swilch (S21) which selects between
the A/B or PFL signalwhich can be monitored by the channel meter via buffer amplifier U13.
This stage has a make-up gain ol +3dB providing nominallevelto the meter.
Monitor Mute
The output ol the channel insed sivitch (S39) leeds the monitor mute element U41 (a053) which
lollows control line'MON-A'.
This is an aulomated switch lunction via the ASlCs.
The rnonitor audio signal is switched al virtual potential and bullered by one half ol lollowing
stage U28 belore leeding the lader reveme wtritch (S48).
Monitor Fader
The channel and monitor faders can be exchanged between the channel and monitor paths
using the'FADER REV" switch.
The monitor lader is lollowed by a buller amplifier with a gain ol +10d8 to compensate lor the
-10d8 loss when the lader is set to "0" operating position.
Monitor Panpot
The output lrom the monitor lader section feeds the pan pot which is conligured to have a -3dB
cenlre position. The outpuls of the pan pots are buffered by voltage lollowers U29 which in lurn
leed the MIX relay, Monitor SOLO switching element U43 and Stereo assign elements U7 and
u8.
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MZ|S-RN lnput Module
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AMEK Mozart
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Monitor Stereo Assign
The monitor slereo assign 'ST' switch (S20) is situated adjacent to the monilor lader and is
litled with an indicator LED. S20 controls elements U7 and U8 directly which in turn swilctr the
post pan L&R rnonitor signals onto stereo virtualearlh busses'L Hl'and'R Hl'.
Note
CorrespMing ground sensrhg Dusses 'L LO' aN'R LO' are snitched simultaneously.
Monitor SOLO
U43 lollows conlrol line "MON-SOLO" which is derived trom the channel rnonilor AFL button.
When operaled, the post pan s(7nal is s,rtitched directly by Uz(l onto the 'SOLO L Hl' and
"SOLO R Hl'virtualearth h.rsses.
Note
Correspnding grouM sensing Dusses 'SOLO L LO'
sirntltaneously by part ot U4l and part of U43
Auxiliary
*nd
(bth
aN
'SOLO R LO' are switched
4053 devices).
Pr*Post Mute Jumper
An internal jumper delermines the auxiliary source lor the PREFADE signal. This may be
configured to be either PRE or POST the channel sQnal only and is eflective on ALL auxiliary
sends.
Mono Auxiliary Sends
Aux 14; Aux 9-12
The rnodule is litted with I discrete rnom auxiliary sends using lour pairs ol dual-concenlric
pots. The upper knobs control auxiliary busses 1 to 4 and the lower kmbs control busses 9 to
.12.
Auxiliary Mute
Mute switches are litted which operate on each concentric pot PAIR (i.e. Aux 1 & 9 share the
sarne mute switch), thus auxiliary buss assignrnent requires some care to preserve llexibilily
of auxiliary mute operations.
Atx 2(10),
Aux3(1 1) and Aux4(12) operate in an klenthal manner to that described above.
Mute operations are perlormed via analogue switches U31 - U36 (4053 devices)which operate
directly onto the buss at virtual earth potential.
Note
Correspnding ground sensing busses are switched simultaneously.
Auxiliary Pre-Post and To Monitor Switching
'Pre-Post" and "To Monilof switching are also shared lunctions operating on adjacent
concenlric pot stacks, thus Aux 1-2; 9-t0 share the same "pre-posl* sryitch (S11) and "to
monitor" switch (S12) with Aux3-4; 11-12 sharing lhe other two switches S13 & S14
respectively.
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MZ|s-RN lnput Module
B-7
AMEK Mozart
Stereo Auxiliary Sends
*8;13-16
The rnodule is also lilted with two sets ol slereo auxiliary sends conrprising a dual corrcentric
pot stack leveUpan arrangement. The upper knob controls the send level, the lower knob the
L-B panning runction.
S:tereo Auxtliary
Euss Assignment
A bank switch is provkled (S18) which allows the stereo sends to address hrsses S€ OR
hlsses 13-16 as stereo pairs.
Stereo Auxillary Mute
C:
Mute switches are litted which operate on each concentric pot stack. (i.e. Aux busses 5-6 and
13-14 will eflectively share the same mute swilch), thus auxiliary buss assignment requires
some care to preserve llexibility of auxiliary mute operations.
Mute operations are perfonned via analogue swilches U38 - U40 (4052 devices) which operate
directly onto the buss at virtual earth potential.
Note
Correspnding ground sensing busses are switched simultaneously.
Stereo Auxiliary Pre-Post and To Monitor Switching
"Pre-Posl'and'To Monilof switching are also shared lunctions operating on BOTH concentric
pot slacks, thus Aux 5-8; 13-'16 share the same "pre-posl'switch (S15) ard'to monitof switch
(s16)
Aux 7-8 Mono
Aux sends 78 are litted with additionalswilching (S17) to allow separate MONO operation.
When operated the upper knob sends discretely to Aux 7, the lower knob to Aux 8.
During MONO operation, pan ballast resistor R229 (31(3) is removed and a law ballast resistor
R230 (2K7) is added between the pot wiper and ground in order to simulate an audio taper
"feel' lo the pot. The source lor Aux I is also taken directly lrom PRE bufler U26.
For operational reasons during MONO operation it is not recommefled to use the'Monitor
Fader To Aux' feature as fhrs configuration would place the short travel monitor fader on Aux
T leaving the concentric pt on Aux 8.
Aux 7-8 Monitor Fader to Aux
Aux sends 7-8 are also litted wilh additionalswitching (S19)to place the Aux tevelpot into the
nrcnitor path and the current monilor lader into the Aux 7-g audio path.
The inpul and output points ol aux level buffer U26 are
termed'AUX<'aM'AUX>' respectively
and are placed betweenthe poles of switch S_19. These signals are swilchedagainst.points
"X3" and "X4'which represent the PRE and POST level signals lor auxiliaries 7-8, thus'under
normal conditions "X4' becomes'AUX<" arid "X3' becomes "AUX>".
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MZ|s-RN lnput Module
8-8
AMEK Mozart
t.
\r
Depending upon the slalus ol lader reverse swilch S48, the current rnonitor lader PRE and
POST signals are lound al points'REV-A' and 'REV-B'at switch S19 which then transters
them to'MON<'and'MON>' respectively lor all monitor related functions.
When switch S19 is operated'AUX<. and'AUX>" points are ALWAYS switched to -MON<"
and 'MON>' to place the aux ievel pot into the monitor path. At the same tirne auxiliary
PRE-POST points 'X4'and 'X3'willbe swilched to points'BEV-A'and 'REV-B'which will be
the PRE-POST signals of the cunent monilor lader.
Aux 7-8 to Multitrack
Aux sends 7-B are also litted with additional swilching (S29) to place the Arx Pan signals onto
the 32 track bussing system, thus expanding the system auxiliary bussing capabilities when
norrnal multitrack routing is not in use. Switch S29 is located near lhe multitrack routing bank
srilch.
When operated, switch S29 selects between Aux 7-8 pan signals and'L-A; R-A'pan signals
which are the outputs ol MIX relay l(2. This allows the'Aux to 32 Track'leature to oveni<Je the
normalpan signals in either RECORD or MIX nrode.
{}
When operated, 529 also operates the mute elements U39
aN
ard U40 (4052) for Aux busses 7
8.
Channel Logic Control
The channel module contains two ASICS (application specif ic integrated circuit), U44 and U45.
These contain the latches tor lhe swilching elemenls that can be controlled by the module
suritches, aulomation and grouping computer.
The ASIC comprises eight latches, each with two inputs (lNA and INB) and two outputs.
The INA 0-7 inputs originate tromlhe switches on the nrodule. The INB 0-7 inputs are produced
by the PC700 digitiser card via conneclor
Jl.
These signals originate ,rom the automation
cornputer and correspond to the swilch signals on INA 0-7.
Switch input lrom INA 0-7 willtoggle the ASIC outputs. Automation input lrom INB 0-7 causes
lhe outpul to lollow the input edge triggering. A leading edge willlorce the output Hl; a trailirE
edge willforce the output LO.
The LED output can directly drive an LED whilst the control output is intended for use with
CMOS only. The OUT signal is sent lo the appropriate analogue swilching element in the
rnodule. Addilionally, lhe signal is led back to the digitiser card via connector J1.
RESET when Hl resets all latches, hence is permanenily connected to ground.
A Hlon the WBITE line writes serialdata to the selected latch.
Address lines A0;A1 ;A2 select one ol eight latches. Address lines A3;A4;A5 and 83;84;85 act
as an address comparator to simplity decoding.
Dl/O is the serial i/o line.
CS is tne chip select.
ln the event ol a lailure ol the +Svott rail, the power io the ASIC is maintained by the UBATT
supply which is derived from ni-cad batteries on the PC722 monitor sub-mother boarO.
PWRFAIL when LO isolates all ASIC latch inputs and outpuls to avoid corruption ol current
status data during power on / powerdown.
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MZls-RN lnput Module
8-9
AMEK Mozart
8
t;
Quick Check Guide
€
L.:
Point
Function
1
M'rc lnput
OdB
2
Line lnput
OdB in; gain unily
3
Mic TrinVLine Gain
4
LeV'el
in;gain min
iC.i......i..i.ii
-3dB
U2;pinl
-3dB
U2;pin7
in;select LINE
-3dB
U4;pin7
YP REV Channel
As above
-3dB
U9; pinT
5
Phase REV
As above
-3dB
U11;
b
HP Filter
As above: Filters lN
-3dB
U13;pin7 (PC779)
7
LP Filter
As above
-3dB
U14;pin7 (PC779)
8
HF EO
As above; EQ lN
-3dB
U3;pin7 (PC779)
9
MFl EO
As above
-3dB
U5;
10
MF2 EQ
As above
-3dB
U9;pinl (PC779)
11
LF EO
As above
-3dB
12
lnsert Send
As above
0dB
HY1; across pins 8&12
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28
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As above
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29
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31
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