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Modular Audio Mixer
for 4...8 channels
Modular audio mixer for 4 and 8 channel inputs
Schematics and Bill of materials for modular mixer
Schematic and BOM of cheap microphone preamp
1
2
3
1
2
3
4
5
6
A
7
8
9
10
11
12
8
P1
1.6kA
6.8K
3
2
C13
47uF 60V
R13
2.2K
R7
RG_1
RG_2
INA217 AIP
Images and Picasa galleries about the prototype of preamps . . . . . . . . . . . . . . . . . . . . . . . . 30
The selectable prototype of jFEt and OpAmp projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Audio mixer with jFET and OpAmp preamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Microphone preamp with INA217 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
R10
1M
GND
7
C11 10uF
J1
R11
100K
7
GND
P2
47kB
U3
OPA137
2
3
10uF
47uF 60V
GND
+15V a2
GND
2
C10
3
470
6
C14
100nF
U2
OPA137
6
R12
470
R14
2.2K
4
Schematic, BOM and PCB for 4 channel mixer mainboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Schematic, BOM and PCB for 8 channel mixer mainboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
R5
1K
V_IN-
-15V a2
Mainboards for 4 and 8 channels modular audio mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
V_OUT
V_IN+
6
11
12
14
15
16
17
18
19
20
22
23
24
R4
1K
GND
C5
C15
Input Jack 6.3
1
2
3
4
5
6
B
7
8
9
10
11
12
GND
GND
R15
100K
10uF
Output
C
Bal In 1 GND
GND
+48V
P4
Header 6X2A
R1
47K
6
5
4
3
2
1
R9
1
REF
Header 6X2A
12
11
10
9
8
7
6.8K
U1
4
8
R8
5
7
D2
1N4148
0
1
2
3
4
5
R6
B
D4
1N4148
V+
D1
1N4148
4
-15V a1
D3
1N4148
C
Printed Circuit Boards for instrument preamps project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Top and bottom PCBs and overlay of stereo jFET preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Top and bottom PCBs and overlay of INA217 microphone preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Top and bottom PCBs and overlay of simple dual OpAmp preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Two single OpAmp - stereo universal preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Two single OpAmp - stereo low noise universal preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Top and bottom PCBs and overlay of power filters (ver.3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Top and bottom PCBs and overlay of power filters (ver.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Top and bottom PCBs and overlay of power filters (ver.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The PCB of power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch module for preamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Variable line output board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Volume adjustment board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GND
+15V a1
GND
3
4
5
6
7
8
9
A
+15V
Header 6X2A
P3
Bal In 2
GND
P6
Schematics and Bill of Materials for modular audio mixer project . . . . . . . . . . . . . . . . . . . . . . 2
Schematic and BOM of cheap microphone preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stereo jFET guitar (instrument, effect) preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stereo dual OpAmp instrument or audio preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stereo circuit with 2 single OpAmp, instrument and audio preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stereo low noise 2 single OpAmp instrument preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Schematic and BOM of power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Schematic and BOM of power filter module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
-15V
C12
47uF 60V
English blog and PCB order: http://custompcb.blogspot.com/
Hungarian blog and PCB order: http://diyguitarpa.blogspot.com/
The Youtube Channel • Picasa gallery • Email: gitarfogas@gmail.com
5
P5
GND
This project is similar than my “Preamplifier-project”, but the preamplifiers must be connected
to the mainboard of mixer. The premplifiers in this project works like modules of audio mixer.
Look at schematics and PCB design how to create mixer with several preamplifiers can be
connected to the mixer’s board. In this project 4 and 8 channel mixer mainboard available.
Read details, updates, advices on the page of schematics and notes. PCB-s and more notes,
pictures, advices about this project are available on the author’s blog and websites:
4
V-
Schematics and Bill of
Materials for modular audio
mixer project
3 -
D
1
2
3
4
5
6
GND
7
8
9
10
11
12
Title
GND
Header 6X2A
Mic and instrument preamp with
assimatrical/simmetrical inputs
Size
D
Number
Revision
A3
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
Date:
File:
1
2
3
11/6/2011
Sheet of
D:\!Works\..\INA217-MicPreamp-MOD.SchDoc
Drawn By:
4
5
6
The Picasa album about prototype testing
Bill of Materials
Comment
OPA137
Res2
Res2
Res2
Res2
Res2
Res2
Res2
Res2
Cap Pol1
INA217AIP
1N4148
Cap Pol1
Header 6X2A
Input Jack 6.3
Pot Mono
Pot Mono
Cap
Footprint
006E
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
Cap, Tantal, 1mil
DIP-8
DO-35
Elco 12 mm, 2 mil pins
HDR2X6_CEN
Jack input 6.3
Pot Mono MetalCase
Pot Mono MetalCase
RAD-0.3
Value
OPA137
100K
1K
1M
2.2K
470
47K
6.8K
8
10uF
INA217 AIP
1N4148
47uF 60V
1.6kA
47kB
100nF
Preamp-INA217
Module.PrjPcb
Quantity
2
2
2
1
2
2
1
2
1
3
1
4
3
4
1
1
1
1
34
Description
FET-Input Operational Amplifiers
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Polarized Capacitor (Radial)
Instrument Amp
High Conductance Fast Diode
Polarized Capacitor (Radial)
Header, 6-Pin, Dual row
Resistor
Resistor
Capacitor
11/10/2011
Model:Footprint
DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Resistor; 2 Leads
Resistor; 2 Leads
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Resistor; 2 Leads
Resistor; 2 Leads
Resistor; 2 Leads
DIP, 8-Pin, Row Spacing 7.62 mm, Pitch 2.54 mm
Diode, Axial; Body 3.8 x 1.9 mm (LxDia. max), Lead Dia. 0.53 mm (max)
Connector; Header; 6x2 Position
3 pin mono metal case pot, 2 mil
3 pin mono metal case pot, 2 mil
Capacitor; 2 Leads
16:31:13
Pins
Designator
#Column Name Error:Price
#Column Name Error:PriceH
Total
Total H
U3, U4
$0.00
0 Ft
2 R11, R15
$0.00
0 Ft
2 R4, R5
$0.00
0 Ft
2 R10
$0.00
0 Ft
2 R13, R14
$0.00
0 Ft
2 R7, R12
$0.00
0 Ft
2 R1
$0.00
0 Ft
2 R6, R9
$0.00
0 Ft
2 R8
$0.00
0 Ft
2 C10, C11, C15
$0.00
0 Ft
8 U1
$0.00
0 Ft
2 D1, D2, D3, D4
$0.00
0 Ft
2 C5, C12, C13
$0.00
0 Ft
12 P3, P4, P5, P6
$0.00
0 Ft
6 J1
$0.00
0 Ft
3 P1
$0.00
0 Ft
3 P2
$0.00
0 Ft
2 C14
$0.00
0 Ft
8
SUM: $0.00
Notes
This circuit made for mono microphone inputs only. The input is mono, 6.3 mm jack inserted directly
to the board with unbalanced/balanced converter, and 3 inputs header for symmetrical phones with
XLR output. Switch module required to select between two inputs (unbalanced jack or balanced XLR).
The amplifier of this circuit is INA217. This instrument amp is very cheap, and noiseless. Volume and
gain potentiometers included. This circuit must be soldered to the mainboard of audio mixer via 2x6 pin
male “L” header.
Document last modified and saved: 11 November 2011 10:29 AM
0 Ft
Modular audio mixer for 4 and 8 channel inputs - 4
5 -
Schematics and Bill of materials for modular mixer
Stereo jFET guitar (instrument, effect) preamp
Schematics and Bill of materials for modular mixer
Stereo dual OpAmp instrument or audio preamplifier
1
1
2
3
4
5
2
6
5
4
3
2
1
1
2
3
4
5
6
R1
5.1K
J1
B
0
1
2
3
4
5
C3
A
10uF
R2
10M
R3
51K
R5
220
GND
10uF
GND
R4
51K
GND
B
GND
P1
GND
Header 2
GND
2
1
Q1B
2N3958
7
R7
22K
R8
10M
C6
10uF
D
100nF
BC548C
Q2
R10
12K
47nF
C8
+15V Input
8
B
1
Pot stereo
5kA
R7
1M
C
-15V Clean
C
Title
3
Bill of Materials
29-04
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
Cap, Tantal, 1mil
Elco 6mm, 1 mil pins
HDR1X2
HDR2X6_CEN
Jack input 6.3
Pots Plastic Stereo
Pots Plastic Stereo
RAD-0.3
RAD-0.3
TO-71
+15V
C
-15V
1
2
3
4
5
6
Stereo Dual jFET preamp
Size
GND
Number
Revision
7
8
9
10
11
12
GND
Header 6X2A
D
A
2
Footprint
GND
P6
11/6/2011
Sheet of
D:\!Works\..\jFet-Preamp-Stereo-MOD.SchDoc
Drawn By:
4
5
Value
10M
12K
220
22K
5.1K
51K
10uF
47uF 60V
47kB
5kA
100nF
47nF
Preamp-jFET
Module.PrjPcb
Quantity
1
2
1
2
1
2
2
5
1
1
1
1
1
1
1
1
1
25
Description
Amplifier Transistor NPN Silicon
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Polarized Capacitor (Radial)
Polarized Capacitor (Radial)
Header, 2-Pin
Header, 6-Pin, Dual row
Resistor
Resistor
Capacitor
Capacitor
N-Channel Dual JFET (General Purpose)
Title
D
6
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
1
11/10/2011
TO, Flat Index; 3 In-Line, Axial Leads; Body Dia. 4.8mm; Leads 0.48 x 0.5 mm (max)
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Resistor; 2 Leads
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Connector; Header; 2 Position
Connector; Header; 6x2 Position
Capacitor; 2 Leads
Capacitor; 2 Leads
Can; 7 Leads (1 Absent); Pin Circle Dia. 2.54 mm; Lead Dia. 0.48 mm (max)
Pins
Designator
#Column Name Error:Price
#Column Name Error:PriceH
Total
Total H
3 Q2
$0.00
0 Ft
2 R2, R8
$0.00
0 Ft
2 R10
$0.00
0 Ft
2 R5, R9
$0.00
0 Ft
2 R7
$0.00
0 Ft
2 R1, R6
$0.00
0 Ft
2 R3, R4
$0.00
0 Ft
2 C1, C2, C3, C4, C6
$0.00
0 Ft
2 C7
$0.00
0 Ft
2 P3
$0.00
0 Ft
12 P4
$0.00
0 Ft
6 J1
$0.00
0 Ft
6 P1
$0.00
0 Ft
6 P2
$0.00
0 Ft
2 C5
$0.00
0 Ft
2 C8
$0.00
0 Ft
6 Q1
$0.00
0 Ft
SUM: $0.00
Notes
This very simple, small, cheap and noiseless preamp made for musical instruments with stereo (or mono) input.
The main part of this circuit is 2N3958 dual jFET. Ideal for stereo or mono guitar effects, keyboards, or to
connect another devices with stereo outputs like audio mixers. Stereo jack, gain and volume adjustable resistors
are inserted to the PCB. Very cheap and very good quality for guitars. The possible gain is not too high of this
circuit, but enough for guitars and guitar effects with very warm sound.
0 Ft
2
3
Number
D
Revision
A
Date:
File:
11/6/2011
Sheet of
D:\!Works\..\OPAMP-Preamp-Stereo-MOD.SchDoc
Drawn By:
4
5
6
The Picasa album about OpAmp amplifier
16:46:17
Model:Footprint
Dual stereo OpAmp w. power filter
Size
The Picasa album about jFET amplifier
Comment
+15V Clean
GND
GND
GND
7
8
9
10
11
12
Header 6X2A
47uF 60V
C7
P5
1
2
3
4
5
6
P3
Pot stereo
100kA
7
TL072ACN
GND
Date:
File:
BC548C
Res2
Res2
Res2
Res2
Res2
Res2
Cap Pol1
Cap Pol1
Header 2
Header 6X2A
Input Jack 6.3
Pot stereo
Pot stereo
Cap
Cap
2N3958
U1B
6
R6
4.7k
R9
220
+15V Stage
C5
10uF
R5
4.7k
4
6
GND
GND
GND
100k
C4
5
Header 2
10uF
68p
R4
5
C
B
C6
C5
R3
22K
GND
1
GND
P2
R6
5.1K
P2
Pot stereo
47kB
TL072ACN
R2
1M
C4 10uF
2
1
A
3
Input Jack 6.3
B
U1A
2
Input Jack 6.3
P3
10uF
68p
R1
C3
10uF
0
1
2
3
4
5
Pot stereo
47kB
1
3
6
100k
J1
Q1A
2N3958
5
C2
C1
P1
C1 10uF
GND
C2
7
8
9
10
11
12
Header 6X2A
2
Header 6X2A
A
A
Out 1
Out 2
4
P4
P4
12
11
10
9
8
7
3
6
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
A
Modular audio mixer for 4 and 8 channel inputs
Bill of Materials
Comment
Res2
Res2
Res2
Res2
Cap Pol1
TL072ACN
Header 2
Header 6X2A
Input Jack 6.3
Pot stereo
Pot stereo
Cap
Footprint
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
Cap, Tantal, 1mil
dip-8
HDR1X2
HDR2X6_CEN
Jack input 6.3
Pots Plastic Stereo
Pots Plastic Stereo
RAD-0.3
Value
100k
1M
22K
4.7k
10uF
100kA
47kB
68p
Preamp-dual OpAmp
Module.PrjPcb
11/10/2011
Quantity
2
2
1
2
4
1
1
3
1
1
1
2
Description
Model:Footprint
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Resistor
Resistor
Resistor
Resistor
Polarized Capacitor (Radial)
Low-Noise J-FET Dual Operational Amplifier DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
Header, 2-Pin
Connector; Header; 2 Position
Header, 6-Pin, Dual row
Connector; Header; 6x2 Position
Resistor
Resistor
Capacitor
Capacitor; 2 Leads
17:02:26
Pins
Designator
#Column Name Error
R1, R4
$0
2 R2, R7
$0
2 R3
$0
2 R5, R6
$0
2 C2, C3, C4, C6
$0
8 U1
$0
2 P1
$0
12 P4, P5, P6
$0
6 J1
$0
6 P3
$0
6 P2
$0
2 C1, C5
$0
2
21
SUM: $
Notes
This is another really simple, good quality and cheap preamplifier with stereo jack input for guitar
effects or keyboards. The possible gain is much higher than jFET circuit, and the sound is better for
keyboards or mixers than the guitars or guitar effects. The dual OpAmp must be compatible with TL072.
Gain and volume pots has inserted to the PCB board.
Document last modified and saved: 11 November 2011 10:29 AM
Modular audio mixer for 4 and 8 channel inputs - 6
7 -
Schematics and Bill of materials for modular mixer
Stereo circuit with 2 single OpAmp, instrument and audio preamplifier
3
4
5
6
Notes
1
1
2
3
4
5
6
7
8
9
10
11
12
Header 6X2A
GND
C1
C2
68p
B
C3
0
1
2
3
4
5
C4
10uF
R2
1M
10uF
Input Jack 6.3
GND
P1
2
1
C
Header 2
1
GND
GND
6
5
LF356D
C6
P6
10uF
68p
R4
100k
7
+15V Clean
U4
2
8
GND
P3
Pot stereo
100kA
7
8
9
10
11
12
C
GND
Header 6X2A
GND
GND
-15V Clean
Title
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
3
D
Stereo single OpAmp preamp w. power filter
Size
2
1
2
3
4
5
6
Number
Revision
A
Date:
File:
11/6/2011
Sheet of
D:\!Works\..\LF356-Preamp-Stereo-MOD.SchDoc
Drawn By:
4
5
6
1
2
3
4
5
6
Bill of Materials
Comment
Res2
Res2
Res2
Res2
Cap Pol1
LF356D
Header 2
Header 6X2A
Input Jack 6.3
Pot stereo
Pot stereo
Cap
Footprint
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
Cap, Tantal, 1mil
dip-8
HDR1X2
HDR2X6_CEN
Jack input 6.3
Pots Plastic Stereo
Pots Plastic Stereo
RAD-0.3
Value
100k
1M
22K
4.7k
10uF
100kA
47kB
68p
Quantity
2
2
1
2
4
2
1
3
1
1
1
2
22
Description
Resistor
Resistor
Resistor
Resistor
Polarized Capacitor (Radial)
Wide-Bandwidth Single J-FET Operational Amplifier
Header, 2-Pin
Header, 6-Pin, Dual row
Resistor
Resistor
Capacitor
Model:Footprint
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
Connector; Header; 2 Position
Connector; Header; 6x2 Position
Capacitor; 2 Leads
Notes
A
Header 6X2A
GND
C2
68p
R1
10uF
100k
J1
Input Jack 6.3
P1
Header 2
8
GND
2
1
GND
GND
6
3
R2
1M
C4
10uF
1
LT1028CN8
8
R7
1M
R5
4.7k
-15V
+15V
R6
4.7k
C
P3
Pot stereo
100kA
6
1
-15V Clean 1
P7
GND
1
2
3
4
5
6
LT1028CN8
GND
GND
7
8
9
10
11
12
GND
Header 6X2A
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
D
Title
D
Stereo preamp w. 2 single OpAmp and 2 power filters
Size
Number
Revision
A
Date:
File:
1
2
3
11/6/2011
Sheet of
D:\!Works\..\LT1115-Preamp-Stereo-MOD.SchDoc
Drawn By:
4
This is the last version of
OpAmp preamplifiers. This
have best quality. This is
the reason why two single
OpAmp included instead
of one dual. LT1115 or
LT1028 recommended for
best result, maybe one of
LF or NE serial OpAmps.
GND
+15V Clean 1
U2
5
3
7
8
9
10
11
12
Header 6X2A
100k
2
1
2
3
4
5
6
GND
10uF
68p
R4
C
P6
-15V Clean
C6
C5
R3
22K
B
GND
5
2
C3
10uF
0
1
2
3
4
5
U1
7
8
9
10
11
12
Header 6X2A
+15V Clean
B
P5
1
2
3
4
5
6
P2
Pot stereo
47kB
C1
This solution is really cheap,
against the noise one powerfilter circuit included (for
both OpAmps). Stereo
jack input, stereo/mono
and bypass switch, gain
and volume potentiometers
inserted to the board.
11/10/2011
6
7
8
9
10
11
12
5
6
The difference between
this and the previous version of board, here we
have two power filter,
one filter for one OpAmp
for the best result of really
low noise and distortion.
The circuit recommended
for home hi-fi and instruments, included instrument effects.
Gain and volume potentiometers, bypass and
stereo/mono switches included to the board with
stereo jack input.
Because the circuit noise,
distortion (and the gain)
depending on the included
single OpAmp, the solution
recommended for all nonguitar instrument, and audio amplifiers for home hi-fi
solutions.
Preamp-single
OpAmp
Module.PrjPcb
5
P4
A
LF356D
D
1
R6
4.7k
5
4
1
R7
1M
R5
4.7k
6
3
+15V
-15V
C5
R3
22K
B
GND
U3 8
3
4
J1
2
7
8
9
10
11
12
Header 6X2A
10uF
100k
7
R1
P4
1
2
3
4
5
6
P2
Pot stereo
47kB
This circuit looks like the
previous version of TL072
compatible OpAmp preamplifier, but for this, two
single OpAmp device
required, instead of one
dual. The reason of this solution is the better quality,
if you want to use really
noiseless single LF or LT
serial integrated circuits
instead of relative noisy
one dual TL072.
4
7
A
P5
3
7
A
2
4
2
Schematics and Bill of materials for modular mixer
Stereo low noise 2 single OpAmp instrument preamplifier
4
1
Modular audio mixer for 4 and 8 channel inputs
Bill of Materials
17:06:34
Comment
Pins
Designator
#Column Name Error:Price
#Column Name
Total
Total H
Res2 Error:PriceH
2 R1, R4
$0.00
0 Ft
Res2
2 R2, R7
$0.00
0 Ft
Res2
2 R3
$0.00
0 Ft
Res2
2 R5, R6
$0.00
Cap Pol10 Ft
2 C2, C3, C4, C6
$0.00
0 Ft
LT1028CN8
8 U3, U4
$0.00
Header 20 Ft
2 P1
$0.00
0 Ft
Header 6X2A
12 P4, P5, P6
$0.00
Ft
Input Jack0 6.3
6 J1
$0.00
Pot stereo0 Ft
6 P3
$0.00
Pot stereo0 Ft
6 P2
$0.00
0 Ft
Cap
2 C1, C5
$0.00
0 Ft
SUM: $0.00
0 Ft
Footprint
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
AXIAL-0.4
Cap, Tantal, 1mil
dip-8
HDR1X2
HDR2X6_CEN
Jack input 6.3
Pots Plastic Stereo
Pots Plastic Stereo
RAD-0.3
Value
100k
1M
22K
4.7k
10uF
100kA
47kB
68p
Preamp-single HQ
OpAmp
Module.PrjPcb
Quantity
2
2
1
2
4
2
1
4
1
1
1
2
Description
Resistor
Resistor
Resistor
Resistor
Polarized Capacitor (Radial)
11/10/2011
Model:Footprint
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
Header, 2-Pin
Header, 6-Pin, Dual row
DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
Connector; Header; 2 Position
Connector; Header; 6x2 Position
Resistor
Resistor
Capacitor
Capacitor; 2 Leads
Ultra Low Noise Precision High-Speed Operational Amplifier
17:12:23
Pins
Designator
#Column Name Error:
R1, R4
$0.
2 R2, R7
$0.
2 R3
$0.
2 R5, R6
$0.
2 C2, C3, C4, C6
$0.
8 U1, U2
$0.
2 P1
$0.
12 P4, P5, P6, P7
$0.
6 J1
$0.
6 P3
$0.
6 P2
$0.
2 C1, C5
$0.
2
23
SUM: $0
Document last modified and saved: 11 November 2011 10:29 AM
Modular audio mixer for 4 and 8 channel inputs - 8
9 -
Schematics and Bill of materials for modular mixer
Schematic and BOM of power supply
1
2
3
4
A
3
5
15V AC - 1
KBL04
C6
47n
3
B
D1
+15V In
C2
10 1W
2200u
C1
2200u
6
OUT
ADJ
C4
100n
2
D2
16V Zener
C3
47u
H1
B
C10
2200u
R2
D3
16V Zener
100n
C13
-15V In
C
2
IN
ADJ
OUT
D
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
C12
47u
1
2
C
3
D
BC550C
BC560C
Res2
Cap Pol1
Cap
Cap
Cap Pol1
Header 6X2A
Sheet of
Drawn By:
5
6
LM317BT
LM337BT
Res2
KBL04
16V Zener
Cap Pol1
Cap Pol1
Connector
Cap
Cap
Footprint
221A-04
221A-04
AXIAL-0.4
Bridge hor.
DIODE-0.7
Elco 12 mm, 2 mil pins
ELCO 22 MM 4 MIL
panel connector 3 input big
RAD-0.3
RAD-0.3
Value
10 1W
47u
2200u
100n
47n
PowerSupply.PrjPcb 11/10/2011
Quantity
1
1
2
1
2
2
4
2
4
4
23
Description
Pins
3-Terminal Adjustable Positive Voltage Regulator TO, Thru-Hole, Vertical, Heatsink Mounted; 3 In-Line Leads; Pitch 2.54 mm
3
3-Terminal Adjustable Negative Voltage Regulator TO, Thru-Hole, Vertical, Heatsink Mounted; 3 In-Line Leads; Pitch 2.54 mm
3
Resistor
Full Wave Diode Bridge
Zener Diode
Polarized Capacitor (Radial)
Polarized Capacitor (Radial)
2
Capacitor
Capacitor
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin Spacing
4
Diode, Thru-Hole; 2 Leads; 0.7 in Pin Spacing
2
2
2
3 pin, 3 mil connector
Radial Cap, Thru-Hole; 2 Leads; 0.3 in Pin Spacing
Radial Cap, Thru-Hole; 2 Leads; 0.3 in Pin Spacing
3
2
2
12K
C6
47nF
47uF 60V
C7
B
GND
2
Footprint
29-04
29-04
AXIAL-0.4
Cap, Tantal, 1mil
CAP, WIMA, 2MIL
CAP, WIMA, 2MIL
Elco 6mm, 1 mil pins
HDR2X6_CEN
Number
Date:
File:
3
Value
BC550C
BC560C
12K
10uF
100nF
47nF
47uF 60V
10/11/2011
D:\!Works\..\PowerFilter.SchDoc
4
Power Filter.PrjPcb
Quantity
1
1
2
2
2
2
2
1
Revision
A
Description
Transistor NPN Silicon
Transistor PNP Silicon
Resistor
Polarized Capacitor (Radial)
Capacitor
Capacitor
Polarized Capacitor (Radial)
Header, 6-Pin, Dual row
Sheet of
Drawn By:
D
5
6
11/10/2011
17:20:43
Model:Footprint
TO, Flat Index; 3 In-Line, Axial Leads; Body Dia. 4.8mm; Leads 0.48 x 0.5 mm (max)
TO, Flat Index; 3 In-Line, Axial Leads; Body Dia. 4.8mm; Leads 0.48 x 0.5 mm (max)
Resistor; 2 Leads
Connector; Header; 6x2 Position
Pins
3
Q2
3 Q1
2 R1, R2
2 C4, C5
2 C2, C3
2 C6, C8
2 C1, C7
12 P1
Designator
#Column Name Error:
$0.
$0.
$0.
$0.
$0.
$0.
$0.
$0.
SUM: $0
Notes
17:24:05
Model:Footprint
BC550C
Q2
R2
13
This is the power supply. Very simple and good quality low power circuit. Two adjustable regulators
can be fixed to the heatsink. The adjustable regulator with Zener diode have cleaner output than simple
7815 and 7915 regulators.
Comment
GND
C2
100nF
Power filter module
Size
This schematic is the partof preamps and EQ projects. This module filtering the symmatrical (+-) power for
circuits. PCB and another modules, mainboards are available.
Comment
Notes
Bill of Materials
C8
47nF
GND
GND
Bill of Materials
Revision
D
4
12K
C4
10uF C5
10uF
C3
100nF
C
1
A
3
BC560C
Q1
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
-15V Out
10/17/2011
D:\!Works\..\Power supply.SchDoc
R1
Title
C14
100n
Number
Date:
File:
6
Header 6X2A
Power supply
Size
5
C
U2
LM337BT
Title
C1
47uF 60V
7
8
9
10
11
12
H2
1
10 1W
GND
3
GND
2200u
C11
1
2
3
4
5
6
B
C5
100n
1
C9
47n
4
A
P1
C7
47n
C8
47n
3
+15V Out
2
GND
15V AC - 2
2
A
2
1
1
1
R1
Schematics and Bill of materials for modular mixer
Schematic and BOM of power filter module
A
LM317BT
U1
IN
Modular audio mixer for 4 and 8 channel inputs
This module required for the preamplifier boards is the power filter circuit. I like to use this simple
circuit to filter the problems of power. These circuits have to be connected to the 12 pins headers
on the preamp PCB. If you think this is not important, you can wire pin 8 to pin 11 and pin 7 to
pin 12 to ignore these circuits and boards.
Designator
#Column Name Error:Price
#Column Name Error:PriceH
Total
Total H
U1
$0.00
0 Ft
U2
$0.00
0 Ft
R1, R2
$0.00
0 Ft
D1
$0.00
0 Ft
D2, D3
$0.00
0 Ft
C3, C12
$0.00
0 Ft
C1, C2, C10, C11
$0.00
0 Ft
H1, H2
$0.00
0 Ft
C4, C5, C13, C14
$0.00
0 Ft
C6, C7, C8, C9
$0.00
0 Ft
SUM: $0.00
We have four versions of power filter PCB. No difference between schematics, only the PCB size
is the0 Ftdifference.
Document last modified and saved: 11 November 2011 10:29 AM
Modular audio mixer for 4 and 8 channel inputs - 10
11 -
Modular audio mixer for 4 and 8 channel inputs
PCB for the modular audio mixer
Top and bottom PCBs and overlay of stereo jFET preamp
TOP LAYER
BOTTOM LAYER
Printed Circuit
Boards for
instrument preamps
TOP OVERLAY ON TOP LAYER
project
PCB TOP OVERLAY
P1
Q1
R3
R3
7
R5
R8
5
R1
3
P2
R4
R6
R8
R1
C7
C5
C7
C5
C3
C4
C1
C2
C8
C2
J1
P3
R10R2
C1
R10R2
Q2
3
1
Q2
C4
C6
C6
J1
12
6
P4
7
1
P3
7
1
12
6
P4
C3
3
1
R9
R7
C8
R9
R7
R6
3
P2
R4
1
5
1
R5
P1
Q1
7
Document last modified and saved: 11 November 2011 10:29 AM
Modular audio mixer for 4 and 8 channel inputs - 12
13 -
Modular audio mixer for 4 and 8 channel inputs
PCB for the modular audio mixer
Top and bottom PCBs and overlay of INA217 microphone preamp
R8
P1
R1
J1
C10
U1
R9
C5
C15
R13
R14
R12
R10
R11
C13
P2
C12
PCB TOP OVERLAY
7
1
TOP LAYER
P4
U2
C14
R7
R6
R5
D4
D3
R15
D2
D1
R4
U3
C11
R8
P1
R1
J1
C10
U1
R9
C5
C15
R13
R14
R12
C13
P2
R10
R11
7
1
12
6
P4
U2
C14
R7
R6
R5
D4
D3
R15
D2
D1
R4
C11
U3
TOP OVERLAY ON TOP LAYER
C12
12
6
BOTTOM LAYER
Document last modified and saved: 11 November 2011 10:29 AM
Modular audio mixer for 4 and 8 channel inputs - 14
15 -
PCB for the modular audio mixer
Top and bottom PCBs and overlay of simple dual OpAmp preamp
Modular audio mixer for 4 and 8 channel inputs
PCB for the modular audio mixer
Two single OpAmp - stereo universal preamp
BOTTOM LAYER
TOP LAYER
C3
R2
TOP LAYER
BOTTOM LAYER
PCB OVERLAY
OVERLAY ON TOP LAYER
P2
C3
R2
PCB OVERLAY
P2
P2
P2
C2
R1 R5 C1
U1
OVERLAY ON TOP LAYER
R7
C1
P3
P3
P3
P3
R6
C5
R7
C1
R1 R5 C1
U1
C2
R6 R7 C6
C5
R2
R6 R7 C6
C2
C3
U4
P1
U3
J1
R3 C6
U3
R3 C6
P1
7
1
12
6
P4
12
6
7
1
12
6
P5
P1
P4
7
1
7
1
12
6
P5
C4
J1
J1
P1
R2
R5
R1 R4 C5
R4 R3
J1
R6
C4
U4
C4
R4 R3
C3
R1 R4 C5
C2
C4
R5
Document last modified and saved: 11 November 2011 10:29 AM
Modular audio mixer for 4 and 8 channel inputs - 16
17 -
PCB for the modular audio mixer
Top and bottom PCBs and overlay of power filters (ver.3)
PCB for the modular audio mixer
Two single OpAmp - stereo low noise universal preamp
TOP LAYER
Modular audio mixer for 4 and 8 channel inputs
TOP LAYER
BOTTOM LAYER
BOTTOM LAYER
Notes
We have 3 versions of power filter PCB. No difference between schematics, the one of them is
landscape, the another 2 is portrait.
PCB OVERLAY
U2
P2
C6
C1
R6
C5
C6
C3
C3
C4
R2
P1J1
R7
P1J1
R7
R1
R1
R3
R3
R4
R4
12
6
P5
C4
3
1
Q2 R2
C7
R1
C1
C2
R5
7
1
R2
7
1
12
6
P5
C4
C2
R5
C7
C1
R6
R1
C1
Q1
3
1
C5
Q2 R2
P3
3
1
P3
Q1
U1
OVERLAY ON TOP LAYER
3
1
U1
PCB OVERLAY
U2
P2
C5
C5
C4
OVERLAY ON TOP LAYER
7
P11
C6
C8
C6
C8
C3
C2
C3
C2
12
6
7
P11
12
6
Document last modified and saved: 11 November 2011 10:29 AM
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