ez1073 Mic/Line EQ - Assembly manual [“Colourbook” Issue 1c]
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ez1073 Mic/Line EQ - Assembly manual[“Colourbook” Issue 1c]
ez1073-500 “Colourbook” Contents.
Section 1 - “Colourbook” assembly guide
Section 2 - Schematics diagrams and PCB Overlays
Section 3 - Parts List
Section 4 - Setup and Calibration
Revisions 1 to 1a;
Revisions 1a to 1b;
Revisions 1b to 1c;
U1 / U2 colour correction
Output transformer mounting drawing
TO220 heatsink part number / supplier
Power transformer wiring drawing added
BC550C transistor option added
Calibration procedure added
Contents page added
Spade terminals added
ez1073 “Colourbook” revision history
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
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Place a “blob” of solder across the two pads for 600 Ohm termination
Output Termination
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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D1, D2, D3, D4 = 1N4001 or 1N4007 (4)Diodes
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R26 = 1R (1)
R11, R105 = 5R6 (2)
R1, R104, R106 = 10R (3)
R23 = 12R (1)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R103 = 15R (1)
R102 = 22R (1)
R100 = 56R (1)
R101 = 39R (1)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R73 = 82R (1)
R99 = 91R (1)
R84 = 130R (1)
R29 = 120R (1)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R98 = 150R (1)
R12, R97 = 240R (2)
R37 = 270R (1)
R83, R96 = 360R (2)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R68, R78 = 390R (2)
R59, R69 = 470R (2)
R88 = 510R (1)
R25,R133, R143 = 620R (3)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R39, R66 = 820R (2)
R87, R89 = 1k0 (2)
R13, R124 = 1k2 (2)
R24, R63, R74 = 1k5 (3)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R76, R80, R86 = 1k8 (3)
R8, R30, R52, R60, R136 = 2k2 (5)
R94, R95, R131, R139 = 2k7 (4)
R9, R16, R38, R65, R93, R137 = 3k3 (6)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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CUTOUT
R33, R62 = 3k6 (2)
R44, R71, R85, R92, R144 = 3k9 (5)
R145 = 4k3 (1)
R35, R47, R134 = 5k1 (3)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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en
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CUTOUT
R122, R123, R141, R142 = 6k8 (4)
R135 = 7k5 (1)
R140 = 8k2 (1)
R4, R15, R22, R41, R49, R53, R64 = 10k (7)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R55, R56, R90 = 12k (3)
R75 = 15k (1)
R17, R82, R91 = 18k (3)
R27, R45 = 27k (2)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R19, R34, R46 = 33k (3)
R32, R54, R57, R61, R132 = 39k (5)
R18, R42, R51 = 47k (3)
R36, R48 = 51k (2)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R14 = 56k (1)
R7, R72, R79 = 68k (3)
R43, R70 = 100k (2)
R28, R50, R67, R77 = 120k (4)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R21, R31, R40, R58 = 180k (4)
R81 = 220k (1)
R5 = 1M0 (1)
R107-R121, R125-R130, R138 = 4M7 (22)
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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R6 = 47R / 3Watt (1)
R2, R3 = 6k81 - 0.1% (2)
The actual value of R109 and R110 is less important than their closeness of matching.2 accurately matched 1% resistors are better than 2 inaccurately matched 0.1% resistors
Resistors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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C23, C40 = 47pF (2)
C28, C39 = 180pF (2)
C44, C56 = 100pF (2)
C9 = 220pF (1)
CeramicCapacitors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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C6 = 330pF (1)
C24, C41 = 680pF (2)
C22, C27, C50 = 470pF (3)
C1, C15, C16, C20, = 100nF (4)
CeramicCapacitors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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C92 = 220pF (1)
C21, C35, C49, C58 = 1nF (4)
C43, C55 = 680pF (2)
C53, C60 = 1n5F (2)
FilmCapacitors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
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C29, C93, C95 = 2n2F (3)
C19, C57, C96 = 10nF (3)
C10, C94 = 4n7F (2)
C82, C87, C102 = 15nF (3)
FilmCapacitors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
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e
Gre
en
Re
d
Vio
let
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wn
CUTOUT
C73, C78, C97, C101, C103 = 22nF (5)
C72, C77, C84, C85, C86, C89, C90, C91, C99 = 100nF (9)
C83, C88, C98 = 47nF (3)
C74, C79 = 220nF (2)
FilmCapacitors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
Blu
e
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en
Re
d
Vio
let
Bro
wn
CUTOUT
C7 = 330nF (1)
C76, C81, = 1uF (2)
C75, C80 = 470nF (2)
FilmCapacitors
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
Blu
e
Gre
en
Re
d
Vio
let
Bro
wn
CUTOUT
ElectrolyticCapacitors C8, C26, C42, C46, C54 = 10uF / 50v (5)
C13, C25 = 2u2F / 63v (2)
C17, C18, C32, C34, C36, C37, C38, C45, C64, C66, C68, C100 = 22uF / 63v (12)
All positive terminals towards left
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
Blu
e
Gre
en
Re
d
Vio
let
Bro
wn
CUTOUT
ElectrolyticCapacitors
C4, C11, C12, C14, C31, C61, C65, C69 = 100uF / 25v (8)
C5, C47, C48, C62, C63 = 220uF / 63v (5)
C59, C67 = 470uF / 16v (2)
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
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e
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en
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d
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wn
CUTOUT
Q1, Q3-Q16 = BC184C or BC550C (15)Small Signal Transistors(All “flat sideto the left”)
R10 = 47k (or 50k) (1) - Top adjust style
R20 = 4K7 (or 5k) (1) - Top adjust style
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
Blu
e
Gre
en
Re
d
Vio
let
Bro
wn
CUTOUT
ElectrolyticCapacitors
C2, C3, C30, C33 = 470uF / 35v (4) All positive terminals towards left
C51, C52, C70, C71 = 1000uF / 35v (4)
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
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e
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en
Re
d
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wn
CUTOUT
Voltage RegulatorHS1, HS2 = Heatsink + Clip (2)
U1 = 7824 voltage regulator (1)
U2 = TL783 voltage regulator (1)
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
Blu
e
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en
Re
d
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Bro
wn
CUTOUT
Output Transistor2N3055
Q2 = 2N3055 + Heatsink (1)
M3 Nyloc nut
Heatsink
M4 x 16mm screw
M4 Shakeproof Washer
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
Blu
e
Gre
en
Re
d
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let
Bro
wn
CUTOUT
Bridge RectifiersKPB02
BR1, BR2 = KPB02 (2)
+~~ -
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
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nge
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e
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en
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d
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wn
CUTOUT
Inductors IN1 = VTB9043
IN2 = VTB9050
IN3= VTB9044
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
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e
Gre
en
Re
d
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let
Bro
wn
CUTOUT
Rotary SwitchesSW2 = GR-03-001 (1) - 12 position, 1 pole, 3 gang
SW8, SW11 = GR-03-002 (2) - 12 position, 1 pole, 1 gang
SW9, SW10 = GR-03-003 (2) - 6 position, 2 pole, 1 gang
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
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nge
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e
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en
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d
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let
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wn
CUTOUT
PotentiometersR147, R148, R149 = OM-01-xxx (3) - 10k Linear 20mm + bracket
R146 = OM-01-xxx (1) - 47k Linear 20mm + bracket
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
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en
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wn
CUTOUT
SW3, SW4, SW5, SW6, SW7 = 2 Position DPDT (on-on) (5)
J3, J4, J5, J6 = ¼ inch Spade terminal (4)
Toggle Switches and Spade Terminals
AM
L“S
panner”
logo
on
this
sid
e
Tig
hte
nup
all
the
scre
ws
Sold
er
the
assem
bly
toth
em
ain
PC
B
Tra
nsfo
rmer
silk
scre
en
printon
this
sid
e
Sold
er
the
rightangle
pin
headers
toth
ecircuit
board
s-
the
longer
pin
goes
thro
ugh
the
PC
B-
trim
off
the
excess
pin
Fit
the
transfo
rmer
ensuring
that
Pin
s2
to6
are
atth
ebottom
Pin
s7
to11
are
atth
eto
pie
Pin
2is
neare
stto
the
“T1”
on
the
PC
B
Fit
the
assem
bly
into
the
main
PC
Band
then
tighte
nup
the
scre
ws
-butnotto
otightly
!!
Rem
ove
the
assem
bly
again
and
then
sold
er
the
transfo
rmer
toit’s
PC
B
On
the
end
ofth
etr
ansfo
rmer
whic
hhas
pin
s,fitan
M3
nylo
nw
asher
betw
een
the
PC
Band
the
transfo
rmer
(this
isto
sto
pth
eP
CB
bendin
gw
hen
scre
wed
dow
n).
Fit
the
scre
ws
inlo
osely
On
the
end
ofth
etr
ansfo
rmer
withoutpin
sfitshakepro
ofw
ashers
onto
the
scre
ws
Fit
the
scre
ws
loosely
Input Transformer Assembly and Fitting
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
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en
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d
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wn
CUTOUT
Input Transformer Assembly and Fitting
T1 = VTB9045 (1)
T2 = VTB9046 (1)
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
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e
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en
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d
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let
Bro
wn
CUTOUT
Output Transformer Assembly and Fitting
60mm
10mm stripped ends
M3 x 35mm screw
M3 x Plain Washer
M3 Nyloc nut
Bro
wn
Vio
let
Red
Gre
en
Blu
eO
range
Bla
ck
Yello
w
T3 = VTB1847 (1)
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48
vT
rim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC
Feeds
Mains
Safety
Earth
Ho
t
Scn
Co
ld
Co
ldH
ot
Scn
Ho
tC
old
Scn
Wh
ite
Wh
ite
Re
d
Re
dSW1 Closed = 600R terminated
SW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yello
w
Bla
ck
Ora
nge
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e
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en
Re
d
Vio
let
Bro
wn
CUTOUT
Power Transformer Assembly and Fitting
M4 x 16mm screw
M4 Shakeproof Washer
White
White
Red
Red
T4 = VTT2326 (1)
Line Gain Freq Freq LFGain
FreqGain
HFGain O/P Trim
Rotary Switch Adjustment Pins
Mic Gainpin at“12 O’clock”
Line Gainpins at“12 O’clock”and“11 O’clock”
MF Freqpins at“12 O’clock”and“7 O’clock”
Fit pins in positions shown then apply the self adhesivesilver washers over the pin holes to stop the pins coming out.
HPF Freqpins at“12 O’clock”and“5 O’clock”
LF Freqpins at“12 O’clock”and“5 O’clock”
IEC Connector(Ideally “Filtered”)
IEC Connector(Ideally “Filtered”)
Live
Live
Mains SwitchDPDT
Mains SwitchDPDT
Fuse/Holder
Fuse/Holder
Earth
Earth
Neutral
Neutral
220-240v Transformer Wiring
100-120v Transformer Wiring
Ch
ass
isStu
dC
ha
ssis
Stu
d
Brown
Brown
White
White
White
White
Violet
Violet
Grey
Grey
Red
Red
Red
Red
Blue
Blue
Green/Yellow
Green/Yellow
PCB “Mains Chassis Earth” Connection
PCB “Mains Chassis Earth” Connection
DateFile
Drawn bySheet
Rev
Title
Number
Audio Maintenance LimitedE-Mail: [email protected]
C Adshead1 of 3
Prodigy ez1073 (Gain Stage)
AML-07-087
Mic Input Hi
Gain Stage 1 Input
+48v DC
Mic Input Lo
Output Hi
Output Lo
V+ Stage 1&2
V Stage 3 +
48v
LoZ/HiZ300/1200
Phase
Increasing Gain Increasing Gain
Increasing Gain
V+ Stage 1&2
Gai
n St
age
2 In
put
Gain Stage 2 Boost
Gain Stage 1
Gain Stage 2
Input Transformer Sub Assemblywith mechanical support PCB
Output Stage
Cha
ssis
Gro
und
3
18th Apr 2011AML-07-087 - rev3
Gain Stage 1 Output
Gain Stage 1 Output
Line Input Lo
Input Transformer Sub Assemblywith mechanical support PCB
Line/Mic Input
Incr
easi
ng "G
ain"
(dec
reas
ing
pad)
EQ Send (to EQ input)
EQ Return (form EQ output)
Line Input Hi
-20
-16
-12
-8
-4
0dB
+4
+8
+12
+16
+20
+15
+20
+25
+30
+35
+40
+45
+50
+55
+60
+65
+70
+15
+20
+25
+30
+35
+40
+45
+50
+55
+60
+65
+70
+15
+20
+25
+30
+35
+40
+45
+50
+55
+60
+65
+70
EQ In
Chass Gnd
Analogue Ground
Analogue Ground
Analogue Ground Analogue Ground Analogue Ground
VTB1847
VTB9046
Gai
n St
age
2 O
utpu
t
All switches shown in their "up" position
DateFile
Drawn bySheet
Rev
Title
Number
Audio Maintenance LimitedE-Mail: [email protected]
C Adshead2 of 3
Prodigy ez1073 (EQ Stage)
AML-07-087
V+ EQ Stage
EQ Input (from EQ send)
Opamp A Input
Opamp A Output
EQ Output (to EQ return)
Opamp A
Opamp A(detail below)
Opamp B(detail below)
Opamp B Input
Opamp B
Opamp B Output
Chassis Ground
Chassis Ground
Analogue Ground
HF Shelf Level
LF Shelf Level
LF Shelf Freq
MF Freq
MF Level
HPF Freq
Analogue Ground Analogue Ground Analogue Ground
Analogue Ground Analogue Ground
AML-07-087 - rev318th Apr 2011
3
DateFile
Drawn bySheet
Rev
Title
Number
Audio Maintenance LimitedE-Mail: [email protected]
C Adshead3 of 3
Prodigy ez1073 (PSU)
AML-07-087
AGnd
+24v DC
Analogue Ground
44v ac
Chassis GroundMains Safety Earth
V+ Stage 3 V+ EQ Stage V+ Stage 1&2
TL783
28v ac
115v ac
115v ac
Analogue Ground
+48v DC48v
Analogue Ground
+24v DC
+48v DC
Analogue Ground
Chassis Ground
AML-07-087 - rev318th Apr 2011
3
"Power Good"
48v LoZ Mic/Line EQ In O/P Phase
Not for commercial useez1073 Rev 3
Mount transform
er this side
Pin 2Pin 6
Mic Input Transform
erLine Input Transform
er
Mount transform
er this side
Pin 2Pin 6
Mic Gain
Line GainHPFFreq
LFFreq LF
Gain
MFFreq
MFGain
HFGain O/P Trim
Mic Input Line Input
Line Output
Output Bias Trim
48v
Trim
Stage 3
Stage 1
Stage 2
Opamp A
Opamp B
48v Regulate 24v Regulate
24v Rect
48v Rect
PWR Good
+24vAgndCgnd+48v
DC Feeds
Mains Safety Earth
Hot
Scn
Col
d
Col
dH
ot
Scn
Hot
Col
dS
cn
Whi
te
Whi
te
Red
Red
SW1 Closed = 600R terminatedSW1 Open = unterminated
VTB9045 VTB9046VTB1847
Yel
low
Bla
ck
Ora
nge
Blu
e
Gre
en
Red
Vio
let
Bro
wn
CUTOUT
47.1
1
(A)(A)(A)(A)(A)
(A) = 6.5mm
(B) = 9.7mm with 14mm counterbore 1.75mm deep
(C) = 10.0mm with 14mm counterbore 1.75mm deep
(D) = 2.2mm
(B) (B) (B) (B) (B)(C) (C) (C) (C) (D)
62.6
8
85.5
3
110.2
9
134.4
1
159.4
9
185.2
3
222.3
6
259.1
8
296.6
5
333.8
1
370.9
6
400.7
9
424.3
1
441.6
9
0.00
14.75 9.80
17.75 23.40
Panel Dimensions - 482.60mm x 44.45mm x 3mm
0.0
0
All dimensions in mm
ez1073 (1U) AML-07-087 Faceplate Holes
306.06
202.53
203.29
94.91
110.82
276.526.02
27.67
75.64
316.52
219.36
10.97
0.00
0.00
To faceplate centre
2.5mm to rear of faceplate(not shown to scale)
Faceplate
394.95
155.33
13 x M3 fixing points
All dimensions in mm
ez1073 (1U) AML-07-087 PCB mounting holes
161.0
7
5.04
8.59
400.72
406.58
ez1073 (1U) AML-07-087 PCB dimensions
Ref D
esVa
lue
Descriptio
nPart Num
ber
U1
7824
Volta
ge Regulator 24 volt
Farnell: 97
5‐62
13
D1
1N40
01/3/7
Diode
Farnell: 14
6‐75
14D2
1N40
01/3/7
Diode
Farnell: 14
6‐75
14D3
1N40
01/3/7
Diode
Farnell: 14
6‐75
14D4
1N40
01/3/7
Diode
Farnell: 14
6‐75
14
Q1
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q3
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q4
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q5
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q6
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q7
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q8
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q9
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q10
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q11
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q12
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q13
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q14
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q15
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57Q16
BC18
4CNPN
Bipolar
Farnell: 10
1‐76
57
BR1
KBP0
2Bridge Rectifier ‐ SIL KBP
02Farnell: 93
8‐09
57BR
2KB
P02
Bridge Rectifier ‐ SIL KBP
02Farnell: 93
8‐09
57
Q2
2N30
55Po
wer Transistor
Farnell: 98
0‐13
08H1
AKK
191
Heatsink ‐ T
03Farnell: 46
2‐13
72
HS1
Heatsink ‐ T
O22
0NPN
Bipolar
Farnell: 17
1‐06
05 + 171
‐064
2 (clip)
HS2
Heatsink ‐ T
O22
0NPN
Bipolar
Farnell: 17
1‐06
05 + 171
‐064
2 (clip)
IN1
VTB9
043
Indu
ctor ‐ VT
B904
3AML: CA‐18‐VT
B904
3IN3
VTB9
044
Indu
ctor ‐ VT
B904
4AML: CA‐18‐VT
B904
4IN2
VTB9
050
Indu
ctor ‐ VT
B905
0AML: CA‐18‐VT
B905
0
PL1
THS‐08
‐R‐RAF
8 pin right a
ngle heade
rTo
by Electronics: THS‐08
‐R‐RAF
PL2
THS‐08
‐R‐RAF
8 pin right a
ngle heade
rTo
by Electronics: THS‐08
‐R‐RAF
PL3
THS‐08
‐R‐RAF
8 pin right a
ngle heade
rTo
by Electronics: THS‐08
‐R‐RAF
PL4
THS‐08
‐R‐RAF
8 pin right a
ngle heade
rTo
by Electronics: THS‐08
‐R‐RAF
LED1
L‐13
HD
Kingbright L‐13H
DFarnell: 11
4‐24
84
PL5
Molex Con
nector ‐ 3 way
3 way Pin Heade
rPL6
Molex Con
nector ‐ 3 way
3 way Pin Heade
rPL7
Molex Con
nector ‐ 3 way
3 way Pin Heade
r
J1NC3
FBH1
Neu
trik 3 Pin XLR ‐ Female
Canford Aud
io: 40‐21
1J2
NC3
FBH1
Neu
trik 3 Pin XLR ‐ Female
Canford Aud
io: 40‐21
1J7
NC3
MBH
Neu
trik 3 Pin XLR ‐ Male
Canford Aud
io: 40‐26
0
R146
47k Lin
POT Omeg P20
Single + Bracket
AML: OM‐01‐08
1R1
4710
k Lin
POT Omeg P20
Single + Bracket
AML: OM‐01‐07
4R1
4810
k Lin
POT Omeg P20
Single + Bracket
AML: OM‐01‐07
4R1
4910
k Lin
POT Omeg P20
Single + Bracket
AML: OM‐01‐07
4
SW3
Switch ‐ C
&K toggle DPD
T on
‐on
Farnell: 94
7‐33
19SW
4Sw
itch ‐ C
&K toggle DPD
T on
‐on
Farnell: 94
7‐33
19SW
5Sw
itch ‐ C
&K toggle DPD
T on
‐on
Farnell: 94
7‐33
19SW
6Sw
itch ‐ C
&K toggle DPD
T on
‐on
Farnell: 94
7‐33
19SW
7Sw
itch ‐ C
&K toggle DPD
T on
‐on
Farnell: 94
7‐33
19
SW8
12 W
ay 1 Pole 1 Gang
Switch ‐ G
rayhill 71 12
W1P
1GAML: GR‐03
‐002
SW11
12 W
ay 1 Pole 1 Gang
Switch ‐ G
rayhill 71 12
W1P
1GAML: GR‐03
‐002
SW2
12 W
ay 1 Pole 3 Gang
Switch ‐ G
rayhill 71 12
W1P
3GAML: GR‐03
‐001
SW9
6 Way 2 Pole 1 Gang
Switch ‐ G
rayhill 71‐ 6W2P
1GAML: GR‐03
‐003
SW10
6 Way 2 Pole 1 Gang
Switch ‐ G
rayhill 71‐ 6W2P
1GAML: GR‐03
‐003
U2
TL78
3Vo
ltage Regulator
Farnell: 17
0‐33
96
T1VT
B904
5Mic Inpu
tTransform
er ‐ VT
B904
5AML: CA‐18‐VT
B904
5T2
VTB9
046
Line
Inpu
t Transform
er ‐ VT
B904
6AML: CA‐18‐VT
B904
6T3
VTB1
847
Line
Outpu
t Transform
er ‐ VT
B184
7AML: CA‐18‐VT
B184
7T4
VTT232
6Po
wer Transform
er ‐ VT
T232
6AML: CA‐18‐VT
T232
6
R10
50k
Preset Poten
tiometer
Farnell: 11
4‐14
07R2
04k7
Preset Poten
tiometer
Farnell: 11
4‐14
03
1R0
R26
1k0
R87
10k
R410
0kR4
35R
6R1
11k0
R89
10k
R15
100k
R70
5R6
R105
1k2
R13
10k
R22
120k
R28
10R
R11k2
R124
10k
R41
120k
R50
10R
R104
1k5
R24
10k
R49
120k
R67
10R
R106
1k5
R63
10k
R53
120k
R77
12R
R23
1k5
R74
10k
R64
180k
R21
15R
R103
1k8
R76
12k
R55
180k
R31
22R
R102
1k8
R80
12k
R56
180k
R40
39R
R101
1k8
R86
12k
R90
180k
R58
47R/3W
attR
62k2
R815
kR7
522
0kR8
156
RR1
002k2
R30
18k
R17
1M0
R582
RR7
32k2
R52
18k
R82
4M7
R107
91R
R99
2k2
R60
18k
R91
4M7
R108
120R
R29
2k2
R136
4M7
R109
130R
R84
2k7
R94
4M7
R110
150R
R98
2k7
R95
27k
R27
4M7
R111
240R
R12
2k7
R131
27k
R45
4M7
R112
240R
R97
2k7
R139
33k
R19
4M7
R113
270R
R37
3k3
R933
kR3
44M
7R1
1436
0RR8
33k3
R16
33k
R46
4M7
R115
360R
R96
3k3
R38
39k
R32
4M7
R116
390R
R68
3k3
R65
39k
R54
4M7
R117
390R
R78
3k3
R93
39k
R57
4M7
R118
470R
R59
3k3
R137
39k
R61
4M7
R119
470R
R69
3k6
R33
39k
R132
4M7
R120
510R
R88
3k6
R62
47k
R18
4M7
R121
620R
R25
3k9
R44
47k
R42
4M7
R125
620R
R133
3k9
R71
47k
R51
4M7
R126
620R
R143
3k9
R85
4M7
R127
820R
R39
3k9
R92
51k
R36
4M7
R128
820R
R66
3k9
R144
51k
R48
4M7
R129
4k3
R145
56k
R14
4M7
R130
5k1
R35
68k
R74M
7R1
385k1
R47
68k
R72
5k1
R134
68k
R79
6k8
R122
6k8
R123
6k8
R141
6k8
R142
6k8 0.1%
R26k8 0.1%
R37k5
R135
8k2
R140
Ref Des Value Description
C23 47pF Ceramic 2.54mm pitch C92 220pF Wima FPK2 C72 100nF Wima MKS2 C13 2u2F/63 Electrolytic 0.08 pitch 5mm diameterC40 47pF Ceramic 2.54mm pitch C77 100nF Wima MKS2 C25 2u2F/63 Electrolytic 0.08 pitch 5mm diameter
C43 680pF Wima FPK2 C84 100nF Wima MKS2C44 100pF Ceramic 2.54mm pitch C55 680pF Wima FPK2 C85 100nF Wima MKS2 C8 10uF/50v Electrolytic 0.08 pitch 5mm diameterC56 100pF Ceramic 2.54mm pitch C86 100nF Wima MKS2 C26 10uF/50v Electrolytic 0.08 pitch 5mm diameterC28 180pF Ceramic 2.54mm pitch C21 1nF Wima MKS2 C89 100nF Wima MKS2 C42 10uF/50v Electrolytic 0.08 pitch 5mm diameterC39 180pF Ceramic 2.54mm pitch C35 1nF Wima MKS2 C90 100nF Wima MKS2 C46 10uF/50v Electrolytic 0.08 pitch 5mm diameterC9 220pF Ceramic 2.54mm pitch C49 1nF Wima MKS2 C91 100nF Wima MKS2 C54 10uF/50v Electrolytic 0.08 pitch 5mm diameterC6 330pF Ceramic 2.54mm pitch C58 1nF Wima MKS2 C99 100nF Wima MKS2C22 470pF Ceramic 2.54mm pitch C17 22uF/63v Electrolytic 0.1 pitch 6.3mm diameterC27 470pF Ceramic 2.54mm pitch C53 1n5F Wima MKS2 C74 220nF Wima MKS2 C18 22uF/63v Electrolytic 0.1 pitch 6.3mm diameterC50 470pF Ceramic 2.54mm pitch C60 1n5F Wima MKS2 C79 220nF Wima MKS2 C32 22uF/63v Electrolytic 0.1 pitch 6.3mm diameter
C7 330nF Wima MKS2 C34 22uF/63v Electrolytic 0.1 pitch 6.3mm diameterC24 680pF Ceramic 2.54mm pitch C29 2n2F Wima MKS2 C75 470nF Wima MKS2 C36 22uF/63v Electrolytic 0.1 pitch 6.3mm diameterC41 680pF Ceramic 2.54mm pitch C93 2n2F Wima MKS2 C80 470nF Wima MKS2 C37 22uF/63v Electrolytic 0.1 pitch 6.3mm diameter
C95 2n2F Wima MKS2 C38 22uF/63v Electrolytic 0.1 pitch 6.3mm diameterC15 100nF Ceramic 2.54mm pitch C76 1uF Wima MKS2 C45 22uF/63v Electrolytic 0.1 pitch 6.3mm diameterC16 100nF Ceramic 2.54mm pitch C10 4n7F Wima MKS2 C81 1uF Wima MKS2 C64 22uF/63v Electrolytic 0.1 pitch 6.3mm diameterC20 100nF Ceramic 2.54mm pitch C94 4n7F Wima MKS2 C66 22uF/63v Electrolytic 0.1 pitch 6.3mm diameterC1 100nF Ceramic 2.54mm pitch C68 22uF/63v Electrolytic 0.1 pitch 6.3mm diameter
C19 10nF Wima MKS2 C100 22uF/63v Electrolytic 0.1 pitch 6.3mm diameterC57 10nF Wima MKS2C96 10nF Wima MKS2 C4 100uF/25v Electrolytic 0.1 pitch 6.3mm diameterC82 15nF Wima MKS2 C11 100uF/25v Electrolytic 0.1 pitch 6.3mm diameterC87 15nF Wima MKS2 C12 100uF/25v Electrolytic 0.1 pitch 6.3mm diameterC102 15nF Wima MKS2 C14 100uF/25v Electrolytic 0.1 pitch 6.3mm diameter
C31 100uF/25v Electrolytic 0.1 pitch 6.3mm diameterC73 22nF Wima MKS2 C61 100uF/25v Electrolytic 0.1 pitch 6.3mm diameterC78 22nF Wima MKS2 C65 100uF/25v Electrolytic 0.1 pitch 6.3mm diameterC97 22nF Wima MKS2 C69 100uF/25v Electrolytic 0.1 pitch 6.3mm diameterC101 22nF Wima MKS2C103 22nF Wima MKS2 C5 220uF/63v Electrolytic 0.2 pitch 10mm diameter
C47 220uF/63v Electrolytic 0.2 pitch 10mm diameterC83 47nF Wima MKS2 C48 220uF/63v Electrolytic 0.2 pitch 10mm diameterC88 47nF Wima MKS2 C62 220uF/63v Electrolytic 0.2 pitch 10mm diameterC98 47nF Wima MKS2 C63 220uF/63v Electrolytic 0.2 pitch 10mm diameter
C59 470uF/16v Electrolytic 0.2 pitch 10mm diameterC67 470uF/16v Electrolytic 0.2 pitch 10mm diameter
C2 470uF/35v Electrolytic 0.2 pitch 10mm diameterC3 470uF/35v Electrolytic 0.2 pitch 10mm diameterC30 470uF/35v Electrolytic 0.2 pitch 10mm diameterC33 470uF/35v Electrolytic 0.2 pitch 10mm diameter
C51 1000uF/35v Electrolytic 0.2 pitch 12.5mm diameterC52 1000uF/35v Electrolytic 0.2 pitch 12.5mm diameterC70 1000uF/35v Electrolytic 0.2 pitch 12.5mm diameterC71 1000uF/35v Electrolytic 0.2 pitch 12.5mm diameter
Power Up;
Phantom Voltage Setting;
Output Bias Setting*;
Measure the voltage the “DC Feeds” spade terminals)
You should read +24 volts
between J6 and J5 (
Measure the voltage the “DC Feeds” spade terminals)
Adjust R10 until you read +48 volts
between J3 and J5 (
Measure the voltage across R26
You should initially get a reading of about 70-80mV DC
Adjust R20 until you read 130mV
* If you have the equipment available, the “correct” way to do this is by measuring the output distortion and adjusting R20 for minimum.However, you will probably end up with a current of about 130mA anyway so the above method works fine.
ez1073 Calibration / Setup
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