preamps public doc
TRANSCRIPT
Preamps for home hi-fi and musical instruments
3 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
Schematics and Bill of materials for instrument preamplifiersSchematic and BOM of cheap microphone preamp
Schematics and Bill of Materials for audio
preamplifiers projects
Schematics and Bill of Materials for audio preamplifiers projects . . . . . . . . . . . . . . . . . . . . . . .2Schematic and BOM of cheap microphone preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Stereo jFET guitar (instrument, effect) preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Stereo dual OpAmp instrument or audio preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Stereo circuit with 2 single OpAmp, instrument and audio preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6Stereo low noise 2 single OpAmp instrument preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7Schematic and BOM of power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Printed Circuit Boards for instrument preamps project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9Top and bottom PCBs and overlay of INA217 microphone preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10Top and bottom PCBs and overlay of stereo jFET preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12Top and bottom PCBs and overlay of simple dual OpAmp preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Top and bottom PCBs and overlay of power filters (ver .3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14Top and bottom PCBs and overlay of power filters (ver .2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15Top and bottom PCBs and overlay of power filters (ver .1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16Two single OpAmp - stereo universal preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17Two single OpAmp - stereo low noise universal preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18Switch module for preamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19The PCB of power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Images and Picasa galleries about the prototype of preamps . . . . . . . . . . . . . . . . . . . . . . . 22The selectable prototype of jFEt and OpAmp projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23Audio mixer with jFET and OpAmp preamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24Microphone preamp with INA217 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
This project made for testing and building the best simple solutions for instrument and audio preamplifiers for home users . Microphone preamp with cheap instrument ampli-fier INA217, noiseless solution with jFET for guitarists, and very simple but hi-gained
audio circuits with OpAmps for audio solutions for home hi-fi . The next project is to make audio mixer with these preamplifier circuits .
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 web-
sites:
English blog and PCB order: http://custompcb.blogspot.com/Hungarian blog and PCB order: http://diyguitarpa.blogspot.com/
The Youtube Channel • Picasa gallery • Email: [email protected]
1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
Title
Number RevisionSize
A3
Date: 10/17/2011 Sheet ofFile: D:\!Works\..\INA217-MicPreamp.SchDocDrawn By:
3
26
74
U3OPA137
1MR10
100nFC14
Q2
BC560C
Q1
BC548C12K
R2
12K
R3
V_OUT 6
REF5
RG_28
V-
4
V_IN-2
RG_11
V+
7
V_IN+3
INA217 AIP
U1
47uF 60V
C3
47uF 60V
C4
47nFC1 47nFC2
100nFC8
100nFC6 10uF
C9 10uFC7
GND
Q3BC560C
Q4
BC548C12K
R17
12K
R16 47uF 60V
C21
47uF 60V
C20
47nFC23
47nFC22
100nFC18
100nF
C16
10uFC17
10uFC19
GND
GND
8R8
2.2KR13
2.2KR14
GND GND
D31N4148
D11N4148 D4
1N4148
D21N4148
47uF 60VC12
47uF 60VC13
6.8K
R6
6.8K
R9
47KR1
GND47uF 60V
C5
GND
GND
+15V
-15V
-15V a2
+15V a2
-15V a1
+15V a1
1.6kAP1
47kBP2
GND
1
2
H4
1
2
H5
1 2 3
H2
1 2 3
H1
+48V
1 2 3
H3
GND
3
26
74
U2OPA137
470
R7
10uFC11
100KR15
100KR11
10uFC15
470R12
GND GND
1KR5
1KR4
GND
GNDOutput
Bal In 1
Bal In 2
0 1 2 3 4 5
J1Input Jack 6.3
10uFC10
123456
789101112
P3Header 6X2A
Mic and instrument preamp with assimatrical/simmetrical inputs
http://diyguitarpa.blogspot.com/http://custompcb.blogspot.com/
Description Comment ValueQuanti
ty Designator Footprint Model:Footprint
Capacitor Cap 47nF 4 C1, C2, C22, C23 RAD-0.3 Capacitor; 2 Leads
Polarized Capacitor (Radial) Cap Pol1 47uF 60V 7C3, C4, C5, C12, C13,C20, C21
Elco 12 mm, 2mil pins
Capacitor Cap 100nF 5 C6, C8, C14, C16, C18 RAD-0.3 Capacitor; 2 Leads
Polarized Capacitor (Radial) Cap Pol1 10uF 7C7, C9, C10, C11, C15,C17, C19 Cap, Tantal, 1mil
High Conductance FastDiode 1N4148 1N4148 4 D1, D2, D3, D4 DO-35
Diode, Axial; Body 3.8 x 1.9 mm (LxDia. max), LeadDia. 0.53 mm (max)
Connector, 3 pin, 2 mil Connector 3 H1, H2, H3Panel Connector3 input Small
Connector, 2 pin, 2 mil Connector 2 H4, H5Panel Connector2 input Small
Input Jack6.3 1 J1 Jack input 6.3
Resistor Pot Mono 1.6kA 1 P1Pot MonoMetalCase 3 pin mono metal case pot, 2 mil
Resistor Pot Mono 47kB 1 P2Pot MonoMetalCase 3 pin mono metal case pot, 2 mil
Header, 6-Pin, Dual rowHeader6X2A 1 P3 HDR2X6_CEN Connector; Header; 6x2 Position
Amplifier Transistor NPNSilicon BC548C 2 Q1, Q4 29-04
TO, Flat Index; 3 In-Line, Axial Leads; Body Dia.4.8mm; Leads 0.48 x 0.5 mm (max)
Low Noise Transistor PNPSilicon BC560C 2 Q2, Q3 29-04
TO, Flat Index; 3 In-Line, Axial Leads; Body Dia.4.8mm; Leads 0.48 x 0.5 mm (max)
Resistor Res2 47K 1 R1 AXIAL-0.4 Resistor; 2 Leads
Resistor Res2 12K 4 R2, R3, R16, R17 AXIAL-0.4 Resistor; 2 Leads
Resistor Res2 1K 2 R4, R5 AXIAL-0.4Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 6.8K 2 R6, R9 AXIAL-0.4 Resistor; 2 Leads
Resistor Res2 470 2 R7, R12 AXIAL-0.4Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 8 1 R8 AXIAL-0.4 Resistor; 2 Leads
Resistor Res2 1M 1 R10 AXIAL-0.4 Resistor; 2 Leads
Resistor Res2 100K 2 R11, R15 AXIAL-0.4Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 2.2K 2 R13, R14 AXIAL-0.4 Resistor; 2 Leads
Instrument AmpINA217AIP INA217 AIP 1 U1 DIP-8 DIP, 8-Pin, Row Spacing 7.62 mm, Pitch 2.54 mm
General Purpose FET-InputOperational Amplifiers OPA137 1 U2 006E
DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54mm
FET-Input Operational AmplifiersOPA137 OPA137 1 U3 006E DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
Notes
This circuit made for mono microphone inputs only . The input is mono, jack in-serted directly to the board with asymmetrical/sym-metrical converter, and 3 inputs header inserted for symmetrical phones with XLR output . Switch module required to select between two inputs (asymmetrical jack or symmetrical XLR) . The amplifier of this circuit is INA217 . This instrument amp is very cheap, and noiseless . Volume and gain potentiometers included .
The Picasa album about prototype testing
Preamplifiers for musical instruments and home hi-fi - 4 5 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
Schematics and Bill of materials for instrument preamplifiersStereo jFET guitar (instrument, effect) preamp
Schematics and Bill of materials for instrument preamplifiersStereo dual OpAmp instrument or audio preamplifier
1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
Title
Number RevisionSize
A
Date: 10/17/2011 Sheet ofFile: D:\!Works\..\jFet-Preamp-Stereo.SchDocDrawn By:
Q2BC548C
12K
R10 47uF 60V
C747nFC8
100nF
C5
10uFC6
GND
+15V Stage
012345
J1
Input Jack 6.3
GND
GND
1
2
3
H1
GND
1
3
2
Q1A2N3958
57
6Q1B2N3958
1
2
H2
1
2
H3
10MR2
10MR8
5.1KR6
5.1KR1
5kA
P2
Pot stereo
47kB
P1
Pot stereo
10uFC2
10uFC3GND
GND
220R9
220R5
GND
10uFC1
10uF
C4
GND51KR3
51KR4
GND GND
22KR7
GND
+15V Input
Out 1
Out 2
12
P3
Header 2
http://diyguitarpa.blogspot.com/http://custompcb.blogspot.com/
Stereo Dual jFET preamp
Description Comment ValueQuanti
ty Footprint Designator Model:Footprint
Polarized Capacitor (Radial) Cap Pol1 10uF 5 Cap, Tantal, 1mil C1, C2, C3, C4, C6
Capacitor Cap 100nF 1 RAD-0.3 C5 Capacitor; 2 Leads
Polarized Capacitor (Radial) Cap Pol1 47uF 60V 1Elco 6mm, 1 milpins C7
Capacitor Cap 47nF 1 RAD-0.3 C8 Capacitor; 2 Leads
Connector 1Panel Connector3 input Small H1 3 pin, 2 mil connector
Connector 2Panel Connector2 input Small H2, H3 2 pin, 2 mil connector
Input Jack6.3 1 Jack input 6.3 J1
Resistor Pot stereo 47kB 1Pots PlasticStereo P1
Resistor Pot stereo 5kA 1Pots PlasticStereo P2
Header, 2-Pin Header 2 1 HDR1X2 P3 Connector; Header; 2 PositionN-Channel Dual JFET (GeneralPurpose) 2N3958 1 TO-71 Q1
Can; 7 Leads (1 Absent); Pin Circle Dia. 2.54 mm;Lead Dia. 0.48 mm (max)
Amplifier Transistor NPN Silicon BC548C 1 29-04 Q2TO, Flat Index; 3 In-Line, Axial Leads; Body Dia.4.8mm; Leads 0.48 x 0.5 mm (max)
Resistor Res2 5.1K 2 AXIAL-0.4 R1, R6Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 10M 2 AXIAL-0.4 R2, R8Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 51K 2 AXIAL-0.4 R3, R4Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 220 2 AXIAL-0.4 R5, R9Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 22K 1 AXIAL-0.4 R7Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 12K 1 AXIAL-0.4 R10 Resistor; 2 Leads
1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
Title
Number RevisionSize
A
Date: 10/17/2011 Sheet ofFile: D:\!Works\..\OPAMP-Preamp-Stereo.SchDocDrawn By:
012345
J1
Input Jack 6.3
47kB
P2Pot stereo
100kA
P3Pot stereo
1
2
3
H3
1
2
3
H2
1
2
3
H1
84
5
67B
U1B
TL072ACN
2
31A
U1A
TL072ACN
12
P1
Header 2
10uFC3
10uFC4
GND GND
GND
22KR3
Q2
BC560C
Q1
BC548C12K
R8
12K
R9
47uF 60V
C9
47uF 60V
C10
47nFC7 47nFC8
100nFC13
100nFC11 10uF
C14 10uFC12 GND
GND
1MR7
1MR2
GND
GND
100k
R1
100k
R468p
C5
68p
C1
10uF
C6
10uF
C2
GND
GND
4.7kR5
4.7kR6
-15V
+15V
+15V Clean
-15V Clean
123456
789101112
P4
Header 6X2A
Dual stereo OpAmp w. power filter
http://diyguitarpa.blogspot.com/http://custompcb.blogspot.com/
Description Comment ValueQuanti
ty Footprint Designator Model:Footprint
Capacitor Cap 68p 2 RAD-0.3 C1, C5 Capacitor; 2 Leads
Polarized Capacitor (Radial) Cap Pol1 10uF 6 Cap, Tantal, 1milC2, C3, C4, C6, C12,C14
Capacitor Cap 47nF 2 RAD-0.3 C7, C8 Capacitor; 2 Leads
Polarized Capacitor (Radial) Cap Pol1 47uF 60V 2Elco 12 mm, 2mil pins C9, C10
Capacitor Cap 100nF 2 RAD-0.3 C11, C13 Capacitor; 2 Leads
Connector 3Panel Connector3 input Small H1, H2, H3 3 pin, 2 mil connector
Input Jack6.3 1 Jack input 6.3 J1
Header, 2-Pin Header 2 1 HDR1X2 P1 Connector; Header; 2 Position
Resistor Pot stereo 47kB 1Pots PlasticStereo P2
Resistor Pot stereo 100kA 1Pots PlasticStereo P3
Header, 6-Pin, Dual rowHeader6X2A 1 HDR2X6_CEN P4 Connector; Header; 6x2 Position
Amplifier Transistor NPN Silicon BC548C 1 29-04 Q1TO, Flat Index; 3 In-Line, Axial Leads; Body Dia.4.8mm; Leads 0.48 x 0.5 mm (max)
Low Noise Transistor PNPSilicon BC560C 1 29-04 Q2
TO, Flat Index; 3 In-Line, Axial Leads; Body Dia.4.8mm; Leads 0.48 x 0.5 mm (max)
Resistor Res2 100k 2 AXIAL-0.4 R1, R4Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 1M 2 AXIAL-0.4 R2, R7Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 22K 1 AXIAL-0.4 R3Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 4.7k 2 AXIAL-0.4 R5, R6Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor Res2 12K 2 AXIAL-0.4 R8, R9 Resistor; 2 Leads
Low-Noise J-FET Dual Operational AmplifierTL072ACN 1 dip-8 U1 DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
Notes
This very simple, small, cheap and noiseless preamp made for musical instruments with ste-reo (or mono) input . The main part of this circuit is 2N3958 dual jFET . Ideal for stereo or mono guitar effects, key-boards, 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 ef-fects with very warm sound .
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 compat-ible with TL072 . Gain and volume pots has inserted to the PCB board .
The Picasa album about jFET amplifier
The Picasa album about OpAmp amplifier
Preamplifiers for musical instruments and home hi-fi - 6 7 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
Schematics and Bill of materials for instrument preamplifiersStereo circuit with 2 single OpAmp, instrument and audio preamplifier
Schematics and Bill of materials for instrument preamplifiersStereo low noise 2 single OpAmp instrument preamplifier
1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
Title
Number RevisionSize
A
Date: 10/17/2011 Sheet ofFile: D:\!Works\..\LF356-Preamp-Stereo.SchDocDrawn By:
012345
J1
Input Jack 6.3
47kB
P2Pot stereo
100kA
P3Pot stereo
1
2
3
H3
1
2
3
H2
1
2
3
H1
12
P1
Header 2
10uFC3
10uFC4
GND GND
GND
22KR3
Q2
BC560C
Q1
BC548C12K
R8
12K
R9
47uF 60V
C9
47uF 60V
C10
47nFC7 47nFC8
100nFC13
100nFC11 10uF
C14 10uFC12 GND
GND
1MR7
1MR2
GND
GND
100kR1
100k
R468p
C5
68p
C1
10uF
C6
10uF
C2
GND
GND
4.7kR5
4.7kR6
-15V
+15V
+15V Clean
-15V Clean
8
53
26
741
U3
LF356D
8
53
26
741
U4
LF356D
123456
789101112
P5
Header 6X2A
http://diyguitarpa.blogspot.com/http://custompcb.blogspot.com/
Stereo single OpAmp preamp w. power filter
Description ValueQuanti
ty Comment Footprint Designator Model:Footprint
Capacitor 68p 2 Cap RAD-0.3 C1, C5 Capacitor; 2 Leads
Polarized Capacitor (Radial) 10uF 6 Cap Pol1 Cap, Tantal, 1milC2, C3, C4, C6, C12,C14
Capacitor 47nF 2 Cap RAD-0.3 C7, C8 Capacitor; 2 Leads
Polarized Capacitor (Radial) 47uF 60V 2 Cap Pol1Elco 12 mm, 2mil pins C9, C10
Capacitor 100nF 2 Cap RAD-0.3 C11, C13 Capacitor; 2 Leads
3 ConnectorPanel Connector3 input Small H1, H2, H3 3 pin, 2 mil connector
1Input Jack6.3 Jack input 6.3 J1
Header, 2-Pin 1 Header 2 HDR1X2 P1 Connector; Header; 2 Position
Resistor 47kB 1 Pot stereoPots PlasticStereo P2
Resistor 100kA 1 Pot stereoPots PlasticStereo P3
Header, 6-Pin, Dual row 1Header6X2A HDR2X6_CEN P5 Connector; Header; 6x2 Position
Amplifier Transistor NPN Silicon 1 BC548C 29-04 Q1TO, Flat Index; 3 In-Line, Axial Leads; Body Dia.4.8mm; Leads 0.48 x 0.5 mm (max)
Low Noise Transistor PNPSilicon 1 BC560C 29-04 Q2
TO, Flat Index; 3 In-Line, Axial Leads; Body Dia.4.8mm; Leads 0.48 x 0.5 mm (max)
Resistor 100k 2 Res2 AXIAL-0.4 R1, R4Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor 1M 2 Res2 AXIAL-0.4 R2, R7Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor 22K 1 Res2 AXIAL-0.4 R3Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor 4.7k 2 Res2 AXIAL-0.4 R5, R6Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor 12K 2 Res2 AXIAL-0.4 R8, R9 Resistor; 2 Leads
Wide-Bandwidth Single J-FET Operational Amplifier2 LF356D dip-8 U3, U4 DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
Title
Number RevisionSize
A
Date: 10/17/2011 Sheet ofFile: D:\!Works\..\LT1115-Preamp-Stereo.SchDocDrawn By:
012345
J1
Input Jack 6.3
47kB
P2Pot stereo
100kA
P3Pot stereo
1
2
3
H3
1
2
3
H2
1
2
3
H1
12
P1
Header 2
10uFC3
10uFC4
GND GND
GND
22KR3
Q2
BC560C
Q1
BC548C12K
R8
12K
R9
47uF 60V
C10
47uF 60V
C11
47nFC7 47nFC8
100nFC13
100nF
C9
10uF
C14 10uFC12 GND
GND
1MR7
1MR2
GND
GND
100kR1
100k
R468p
C5
68p
C1
10uF
C6
10uF
C2
GND
GND
4.7kR5
4.7kR6+15V Clean
-15V Clean
52
3
4
6
7
18
U1
LT1028CN8
52
3
4
6
7
18
U2
LT1028CN8
Q4
BC560C
Q3
BC548C12K
R10
12K
R11
47uF 60V
C18
47uF 60V
C19
47nFC15 47nFC16
100nFC21
100nF
C17
10uF
C22 10uFC20
+15V Clean 1
-15V Clean 1
-15V
+15V
123456
789101112
P4
Header 6X2A
http://diyguitarpa.blogspot.com/http://custompcb.blogspot.com/
Stereo preamp w. 2 single OpAmp and 2 power filtersGND
Description ValueQuanti
ty Comment Footprint Designator Model:Footprint
Capacitor 68p 2 Cap RAD-0.3 C1, C5 Capacitor; 2 Leads
Polarized Capacitor (Radial) 10uF 8 Cap Pol1 Cap, Tantal, 1milC2, C3, C4, C6, C12,C14, C20, C22
Capacitor 47nF 4 Cap RAD-0.3 C7, C8, C15, C16 Capacitor; 2 Leads
Capacitor 100nF 4 Cap RAD-0.3 C9, C13, C17, C21 Capacitor; 2 Leads
Polarized Capacitor (Radial) 47uF 60V 4 Cap Pol1Elco 12 mm, 2mil pins C10, C11, C18, C19
3 ConnectorPanel Connector3 input Small H1, H2, H3 3 pin, 2 mil connector
1Input Jack6.3 Jack input 6.3 J1
Header, 2-Pin 1 Header 2 HDR1X2 P1 Connector; Header; 2 Position
Resistor 47kB 1 Pot stereoPots PlasticStereo P2
Resistor 100kA 1 Pot stereoPots PlasticStereo P3
Header, 6-Pin, Dual row 1Header6X2A HDR2X6_CEN P4 Connector; Header; 6x2 Position
Amplifier Transistor NPN Silicon 2 BC548C 29-04 Q1, Q3TO, Flat Index; 3 In-Line, Axial Leads; Body Dia.4.8mm; Leads 0.48 x 0.5 mm (max)
Low Noise Transistor PNPSilicon 2 BC560C 29-04 Q2, Q4
TO, Flat Index; 3 In-Line, Axial Leads; Body Dia.4.8mm; Leads 0.48 x 0.5 mm (max)
Resistor 100k 2 Res2 AXIAL-0.4 R1, R4Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor 1M 2 Res2 AXIAL-0.4 R2, R7Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor 22K 1 Res2 AXIAL-0.4 R3Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor 4.7k 2 Res2 AXIAL-0.4 R5, R6Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
Resistor 12K 4 Res2 AXIAL-0.4 R8, R9, R10, R11 Resistor; 2 Leads
Ultra Low Noise Precision High-Speed Operational Amplifier2 LT1028CN8 dip-8 U1, U2 DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
Notes
This circuit looks like the previous version of TL072 compatible OpAmp pre-amplifier, but for this, two single OpAmp device required, instead of one dual . The reason of this so-lution is the better quality, if you want to use for exam-ple really noiseless single LF or LT serial integrated circuits instead of relative noisy one dual TL072 .
This solution is really cheap, against the noise one pow-erfilter circuit included (for both OpAmps) . Stereo jack input, stereo/mono and bypass switch, gain and volume potentiometers inserted to the board .
Because the circuit noise, distortion (and the gain) depending on the included single OpAmp, the solution recommended for all non-guitar instrument, and au-dio amplifiers for home hi-fi solutions .
Notes
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 .
The difference between this and the previous version of board, here we have two power filter, one filter for one OpAmp for the best re-sult of really low noise and distortion . The cir-cuit recommended for home hi-fi and instru-ments, included instru-ment effects .
Gain and volume po-tentiometers, bypass and stereo/mono switches included to the board with stereo jack input .
Preamplifiers for musical instruments and home hi-fi - 8 9 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
Printed Circuit
Boards for
instrument preamps
project
Schematics and Bill of materials for instrument preamplifiersSchematic and BOM of power supply
1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
Title
Number RevisionSize
A
Date: 10/17/2011 Sheet ofFile: D:\!Works\..\Power supply.SchDoc Drawn By:
1
2
3
H1
1
2
3
H2
D1 KBL04
47nC6
47nC8
47nC9
47nC7
GND
2200uC1
2200uC10
10 1W
R1
10 1W
R2
2200uC2
2200uC11
GND
100nC4
100nC13
IN3
1
OUT 2
ADJ
U1LM317BT
IN2
1
OUT 3ADJ
U2LM337BT
D216V Zener
D316V Zener
47uC3
47uC12
100nC5
100nC14
15V AC - 1
15V AC - 2
+15V In
-15V In
+15V Out
-15V Out
http://diyguitarpa.blogspot.com/http://custompcb.blogspot.com/
Power supply
Description CommentQuanti
ty Value Footprint Designator Model:Footprint
Polarized Capacitor (Radial) Cap Pol1 4 2200uELCO 22 MM 4MIL C1, C2, C10, C11
Polarized Capacitor (Radial) Cap Pol1 2 47uElco 12 mm, 2mil pins C3, C12
Capacitor Cap 4 100n RAD-0.3 C4, C5, C13, C14Radial Cap, Thru-Hole; 2 Leads; 0.3 in PinSpacing
Capacitor Cap 4 47n RAD-0.3 C6, C7, C8, C9Radial Cap, Thru-Hole; 2 Leads; 0.3 in PinSpacing
Full Wave Diode Bridge KBL04 1 Bridge hor. D1
Zener Diode 16V Zener 2 DIODE-0.7 D2, D3 Diode, Thru-Hole; 2 Leads; 0.7 in Pin Spacing
Connector 2panel connector3 input big H1, H2 3 pin, 3 mil connector
Resistor Res2 2 10 1W AXIAL-0.4 R1, R2Axial Device, Thru-Hole; 2 Leads; 0.4 in PinSpacing
3-Terminal Adjustable PositiveVoltage Regulator LM317BT 1 221A-04 U1
TO, Thru-Hole, Vertical, Heatsink Mounted; 3 In-Line Leads; Pitch 2.54 mm
3-Terminal Adjustable Negative Voltage RegulatorLM337BT 1 221A-04 U2 TO, Thru-Hole, Vertical, Heatsink Mounted; 3 In-Line Leads; Pitch 2.54 mm
Notes
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 .
Preamplifiers for musical instruments and home hi-fi - 10 11 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
PCB for the instrument preampsTop and bottom PCBs and overlay of INA217 microphone preamp
1
13
3
1
C5
Q2
1 R3
C16
D2
R4
Q1
Q3
C3
C1
R7 R5R6
R1
D4
C9
R15
C6
C8
C15
R13
R12R14
R10
J1
P1
P2
Q4
C4
R8R9
R17
U2
D1
H4 H5
R11
C17
C19
C10
C2R16
R2
C23
C14
C21U1
C11D3
C7
C20
H2
3
3H1 H3
U3
C22
C13
C12
C18
1
13
3
1
C5
Q2
1 R3
C16
D2
R4
Q1
Q3
C3
C1
R7 R5R6
R1
D4
C9
R15
C6
C8
C15
R13
R12R14
R10
J1
P1
P2
Q4
C4
R8R9
R17
U2
D1
H4 H5
R11
C17
C19
C10
C2R16
R2
C23
C14
C21U1
C11D3
C7
C20
H2
3
3
H1 H3
U3
C22
C13
C12
C18
TO
P LA
YE
RB
OT
TO
M LA
YE
R
PCB TOP OVERLAYT
OP
OV
ER
LAY
ON
TO
P LA
YE
R
Preamplifiers for musical instruments and home hi-fi - 12 13 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
PCB for the instrument preampsTop and bottom PCBs and overlay of stereo jFET preamp
TO
P LA
YE
R
BO
TT
OM
LA
YE
R
PCB TOP OVERLAY
TOP OVERLAY ON TOP LAYER
51
H2
H3
R9
3
Q1
C3
7
R2
P1
1
P2
J1
3Q2
C6
C5
R6
R7
R1
R4
R3
H1
R10
C1 C2C4
C8
C7
R5
R8
P3
51
H2
H3
R9
3
Q1
C3
7
R2
P1
1
P2
J1
3Q2
C6
C5
R6
R7
R1
R4
R3
H1
R10
C1 C2C4
C8
C7
R5
R8
P3
TOP LAYER BOTTOM LAYER
PCB OVERLAY
OVERLAY ON TOP LAYER
PCB for the instrument preampsTop and bottom PCBs and overlay of simple dual OpAmp preamp
1
C14
H2
R8
1
3
Q2
Q1
R9
C7
C8
C1
H1
C2
C6
C5
R5
P1
R6
P3
P2
C4 J1
C3
C11
3
R4
C12
H3
C9
R1U1
R2
R7
C10
C13
R3
1
C14
H2
R8
1
3
Q2
Q1
R9
C7
C8
C1
H1
C2
C6
C5
R5
P1
R6
P3
P2
C4 J1
C3
C11
3
R4
C12
H3
C9
R1U1
R2
R7
C10
C13
R3
Preamplifiers for musical instruments and home hi-fi - 14 15 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
PCB for the instrument preampsTop and bottom PCBs and overlay of power filters (ver .3)
TO
P LA
YE
R
BO
TT
OM
LA
YE
R
PC
B O
VE
RLA
Y
1
1 6P17 12
3
R2
Q1
C4C5
R1
C6
3
1
C7
Q2
C8
C1
C3 C2
1
1 6P17 12
3
R2
Q1
C4C5
R1
C6
3
1C7
Q2
C8
C1
C3 C2
OV
ER
LAY
ON
TO
P L
AY
ER
TO
P LA
YE
R
BO
TT
OM
LA
YE
R
PCB OVERLAY
OVERLAY ON TOP LAYER
PCB for the instrument preampsTop and bottom PCBs and overlay of power filters (ver .2)
1 67 12P1
C3
C2
C8
C6
1
Q1
C1
3 R1
3R2
1
Q2C7
C5 C
41 67 12P1
C3
C2
C8
C6
1
Q1
C1
3 R1
3R2
1
Q2C7
C5 C
4
Notes
We have 3 versions of power filter PCB . No dif-ference between schematics, the one of them is landscape, the another 2 is portrait .
Notes
We have 3 versions of power filter PCB . No difference between schematics, the one of them is landscape, the another 2 is portrait .
Preamplifiers for musical instruments and home hi-fi - 16 17 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
1 6
3
7 12
C6 C2
P1
Q2
13
1
C3 C8
C5
R2
C1 C4
R1Q1
C7
1 6
3
7 12
C6 C2
P1
Q2
13
1
C3 C8
C5
R2
C1 C4
R1Q1
C7
PCB for the instrument preampsTop and bottom PCBs and overlay of power filters (ver .1)
TOP LAYER
BOTTOM LAYER
PCB OVERLAY
OVERLAY ON TOP LAYER
Notes
We have 3 versions of power filter PCB . No dif-ference between schematics, the one of them is landscape, the another 2 is portrait .
PCB for the instrument or hi-fi preampsTwo single OpAmp - stereo universal preamp
31
C1
C8
H1
H3
H2
C10
1
Q1
R9
C2
R7 C9
R5
R3
U4
C11
J1
3
C3
R1 C5U3
C13
R2
Q2 R6
C14
C4C7
R8
P1
C6
P2
R4
C12
P3
31
C1
C8
H1
H3
H2
C10
1
Q1
R9
C2
R7 C9
R5
R3
U4
C11
J1
3
C3
R1 C5U3
C13
R2
Q2 R6
C14
C4C7
R8
P1
C6
P2
R4
C12
P3
TOP LAYER BOTTOM LAYER
PCB OVERLAY
OVERLAY ON TOP LAYER
Preamplifiers for musical instruments and home hi-fi - 18 19 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
PCB for the instrument or hi-fi preampsTwo single OpAmp - stereo low noise universal preamp
PCB for the instrument or hi-fi preampsSwitch module for preamps
TOP LAYER
TOP LAYER
BOTTOM LAYER
BO
TT
OM
LAY
ER
PCB OVERLAY
PC
B O
VE
RLA
Y
OVERLAY ON TOP LAYER
1 1
1
Q3
Q4
H3
C1
C5
C9
U1
3
Q2
H2
3
Q1C7
R4R3
R7
R1
R5
R2
R6
H1
C3
P3
P2
J1
C8
1
C15
R10
C16
C4
C18
C6
R9
C2
P1
C10
C11
3C17
C20
U2
3
R11C22 C21
R8C14 C13
C12
C19
1 1
1
Q3
Q4
H3
C1
C5
C9
U1
3
Q2
H2
3
Q1C7
R4R3
R7
R1
R5
R2
R6
H1
C3
P3
P2
J1
C8
1
C15
R10
C16
C4
C18
C6
R9
C2
P1
C10
C11
3C17
C20
U2
3
R11C22 C21
R8C14 C13
C12
C19
1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
Title
Number RevisionSize
A
Date: 10/18/2011 Sheet ofFile: D:\!Works\..\Switches.SchDoc Drawn By:
123456
789101112
P5
Header 6X2A
123
654SW
2
A/B Switc
h
123
654
SW1A/B Switch
1 2 3
6 5 4
SW3
A/B Switc
h
http://diyguitarpa.blogspot.com/http://custompcb.blogspot.com/
Switch module
71
71
OVERLAY ON TOP LAYER
Preamplifiers for musical instruments and home hi-fi - 20 21 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
PCB for the instrument or hi-fi preampsThe PCB of power supply
TOP LAYER
BOTTOM LAYER
1 2 1
C13
C4
R2
C7
C6
C8
C9
R1
C10
C12
D2
3C5
U2
3C14
H1
C1 C2
H2
C11
U1
2D1
C3
D3
1 2 1
C13
C4
R2
C7
C6
C8
C9
R1
C10
C12
D2
3C5
U2
3C14
H1
C1 C2
H2
C11
U1
2D1
C3
D3
OVERLAY ON TOP LAYER
PCB OVERLAY
Preamplifiers for musical instruments and home hi-fi - 22 23 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
Images and Picasa
galleries about the
prototype of preamps
Images about the prototypes of this preamp projectThe selectable prototype of jFEt and OpAmp projects
The Picasa gallery about this circuit
Preamplifiers for musical instruments and home hi-fi - 24 25 - Preamplifiers for musical instruments and home hi-fi
Document last modified and saved: 19 October 2011 7:39 PM
Images about the prototypes of this preamp projectAudio mixer with jFET and OpAmp preamps
Images about the prototypes of this preamp projectMicrophone preamp with INA217
The Picasa gallery about this circuit The Picasa galleries about this circuit:
• Planning and collecting parts• Images about the prototype• Testing the INA217 board
English blog and PCB order: http://custompcb.blogspot.com/Hungarian blog and PCB order: http://diyguitarpa.blogspot.com/
The Youtube Channel • Picasa gallery • Email: [email protected]