Preamps public doc .pdf
File information
Original filename: Preamps-public-doc.pdf
This PDF 1.7 document has been generated by Adobe InDesign CS5.5 (7.5.1) / Adobe PDF Library 9.9, and has been sent on pdf-archive.com on 19/10/2011 at 19:49, from IP address 188.142.x.x.
The current document download page has been viewed 7422 times.
File size: 3.2 MB (14 pages).
Privacy: public file
Share on social networks
Link to this file download page
Document preview
Preamps for home hi-fi and
musical instruments
3 -
Schematics and Bill of
Materials for audio
preamplifiers projects
Preamplifiers for musical instruments and home hi-fi
Schematics and Bill of materials for instrument preamplifiers
Schematic and BOM of cheap microphone preamp
1
4
+15V a1
47uF 60V
Q2
Q1
R2
12K
C6 100nF
C7
10uF
10uF
BC548C
C9
100nF
C8
C4
R3
BC560C 12K
47uF 60V
-15V a1
8
R8
6.8K
R9
REF
RG_1
8
C13
47uF 60V
GND
J1
7
4
C17
10uF
C15
Input Jack 6.3
R15
100K
10uF
Output
H4
C
1
GND
Bal In 1 GND
Header 6X2A
Bal In 2
C16
100nF
Q4
R17
Q3
12K
BC560C
BC548C
2
47uF 60V
C21
H5
GND
C23
47nF
Title
GND
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
4
5
6
7
8
Printed Circuit Boards for instrument preamps project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Top and bottom PCBs and overlay of INA217 microphone preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Top and bottom PCBs and overlay of stereo jFET preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Top and bottom PCBs and overlay of simple dual OpAmp 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Two single OpAmp - stereo universal preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Two single OpAmp - stereo low noise universal preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Switch module for preamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The PCB of power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
12
13
14
15
16
17
18
19
20
Images and Picasa galleries about the prototype of preamps . . . . . . . . . . . . . . . . . . . . . . . . 22
The selectable prototype of jFEt and OpAmp projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Audio mixer with jFET and OpAmp preamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Microphone preamp with INA217 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Date:
File:
2
Mic and instrument preamp with
assimatrical/simmetrical inputs
Number
D
Revision
A3
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
1
P3
1
Size
Schematics and Bill of Materials for audio preamplifiers projects . . . . . . . . . . . . . . . . . . . . . . 2
B
10uF
2
GND
C19
10uF
GND
P2
47kB
U3
OPA137
2
C22
47nF
D
R11
100K
GND
3
C18
100nF
R16
12K
2
C10
3
6
C11 10uF
R10
1M
+15V a2
-15V a2
C20
6
C14
100nF
6
U2
OPA137
470
R12
470
GND
47uF 60V
R5
1K
V_IN-
R14
2.2K
C
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
V_OUT
V_IN+
2
C12
47uF 60V
INA217 AIP
RG_2
3
R13
2.2K
R4
1K
GND
R7
1
P1
1.6kA
6.8K
U1
5
12
11
10
9
8
7
R6
B
D2
1N4148
D4
1N4148
V-
D1
1N4148
7
D3
1N4148
4
GND
6
5
4
3
2
1
GND
7
C3
GND
4
-15V
C5
47uF 60V
C2 47nF
+15V
R1
47K
0
1
2
3
4
5
+48V
V+
This project made for testing and building the best simple solutions for instrument and
audio preamplifiers for home users. Microphone preamp with cheap instrument amplifier 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 websites:
6
A
C1 47nF
GND
5
3
2
1
3
2
1
3
2
1
3
H1
H2
H3
A
2
3
4
10/17/2011
Sheet of
D:\!Works\..\INA217-MicPreamp.SchDocDrawn By:
5
6
The Picasa album about prototype testing
Description
Comment
Value
Capacitor
Cap
47nF
Polarized Capacitor (Radial)
Cap Pol1
47uF 60V
Capacitor
Cap
100nF
Polarized Capacitor (Radial)
High Conductance Fast
Diode
Cap Pol1
10uF
1N4148
1N4148
Quanti
ty
Designator
4 C1, C2, C22, C23
C3, C4, C5, C12, C13,
7 C20, C21
Footprint
RAD-0.3
Elco 12 mm, 2
mil pins
5 C6, C8, C14, C16, C18 RAD-0.3
Capacitor; 2 Leads
C7, C9, C10, C11, C15,
7 C17, C19
Cap, Tantal, 1mil
Diode, Axial; Body 3.8 x 1.9 mm (LxDia. max), Lead
4 D1, D2, D3, D4
DO-35
Dia. 0.53 mm (max)
Panel Connector
3 H1, H2, H3
3 input Small
Panel Connector
2 H4, H5
2 input Small
Connector, 3 pin, 2 mil
Connector
Connector, 2 pin, 2 mil
Connector
Input Jack
6.3
Resistor
Pot Mono 1.6kA
1 P1
Resistor
Pot Mono 47kB
Header
6X2A
1 P2
Jack input 6.3
Pot Mono
MetalCase
Pot Mono
MetalCase
1 P3
HDR2X6_CEN
BC548C
2 Q1, Q4
29-04
BC560C
2 Q2, Q3
Header, 6-Pin, Dual row
Amplifier Transistor NPN
Silicon
Low Noise Transistor PNP
Silicon
Model:Footprint
Capacitor; 2 Leads
1 J1
3 pin mono metal case pot, 2 mil
3 pin mono metal case pot, 2 mil
29-04
Connector; Header; 6x2 Position
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
Res2
47K
1 R1
AXIAL-0.4
Resistor; 2 Leads
Resistor
Res2
12K
4 R2, R3, R16, R17
AXIAL-0.4
Resistor
Res2
1K
2 R4, R5
AXIAL-0.4
Resistor; 2 Leads
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin
Spacing
Resistor
Res2
6.8K
2 R6, R9
AXIAL-0.4
Resistor
Res2
470
2 R7, R12
AXIAL-0.4
Resistor; 2 Leads
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin
Spacing
Resistor
Res2
8
1 R8
AXIAL-0.4
Resistor; 2 Leads
Resistor
Res2
1M
1 R10
AXIAL-0.4
Resistor
Res2
100K
2 R11, R15
AXIAL-0.4
Resistor; 2 Leads
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin
Spacing
Resistor
Res2
2.2K
INA217AI
P
INA217 AIP
2 R13, R14
AXIAL-0.4
Resistor; 2 Leads
1 U1
DIP-8
OPA137
1 U2
006E
DIP, 8-Pin, Row Spacing 7.62 mm, Pitch 2.54 mm
DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54
mm
1 U3
006E
DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
Instrument Amp
General Purpose FET-Input
Operational Amplifiers
OPA137
FET-Input Operational Amplifiers
OPA137
Notes
This circuit made for mono
microphone inputs only.
The input is mono, jack inserted directly to the board
with asymmetrical/symmetrical 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.
Document last modified and saved: 19 October 2011 7:39 PM
- 4
Preamplifiers for musical instruments and home hi-fi
5 -
Schematics and Bill of materials for instrument preamplifiers
Stereo jFET guitar (instrument, effect) preamp
Schematics and Bill of materials for instrument preamplifiers
Stereo dual OpAmp instrument or audio preamplifier
1
1
2
3
4
5
2
A
1
2
3
4
5
6
A
R1
5.1K
Out 2
J1
Q1A
2N3958
A
J1
0
1
2
3
4
5
C3
10uF
R2
10M
R3
51K
R5
220
GND
10uF
GND
R4
51K
GND
B
C4 10uF
GND
2
1
Header 2
GND
R7
22K
H2
Q1B
2N3958
7
R8
10M
2
+15V Stage
1
2
C5
C6
10uF
1
100nF
H3
D
BC548C
Q2
R10
12K
47nF
C8
+15V Input
8
Pot stereo
5kA
C
-15V
Stereo Dual jFET preamp
Size
H2
Number
Revision
D
3
4
5
6
Description
Comment
Value
Footprint
Designator
Polarized Capacitor (Radial)
Cap Pol1
10uF
5 Cap, Tantal, 1mil C1, C2, C3, C4, C6
Capacitor
Cap
100nF
C5
Polarized Capacitor (Radial)
Cap Pol1
47uF 60V
1 RAD-0.3
Elco 6mm, 1 mil
1 pins
Capacitor
Cap
47nF
1 RAD-0.3
C8
Panel Connector
2 2 input Small
H2, H3
Connector
Input Jack
6.3
Resistor
Pot stereo
Pot stereo
47kB
5kA
Capacitor; 2 Leads
C7
Panel Connector
1 3 input Small
H1
Connector
Model:Footprint
1 Jack input 6.3
Pots Plastic
1 Stereo
Pots Plastic
1 Stereo
J1
1 HDR1X2
P3
Capacitor; 2 Leads
3 pin, 2 mil connector
2 pin, 2 mil connector
P1
P2
Header, 2-Pin
Header 2
N-Channel Dual JFET (General
Purpose)
2N3958
Resistor
Res2
5.1K
2 AXIAL-0.4
R1, R6
Resistor
Res2
10M
2 AXIAL-0.4
R2, R8
Resistor
Res2
51K
2 AXIAL-0.4
R3, R4
Resistor
Res2
220
2 AXIAL-0.4
R5, R9
Resistor
Res2
22K
1 AXIAL-0.4
R7
Connector; Header; 2 Position
Can; 7 Leads (1 Absent); Pin Circle Dia. 2.54 mm;
Lead Dia. 0.48 mm (max)
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
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
1 TO-71
Q1
Amplifier Transistor NPN Silicon BC548C
1 29-04
Q2
Resistor
Res2
12K
1 AXIAL-0.4
R10
Resistor; 2 Leads
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.
Q2
R8
47uF 60V
12K
C11100nF
10uF
BC548C
C14
C12
10uF
100nF
C13
BC560C
R9
C10
12K
47uF 60V
GND
1
Title
D
GND
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
1
Dual stereo OpAmp w. power filter
Size
2
Number
D
Revision
A
Date:
File:
3
Notes
Quanti
ty
C8 47nF
Q1
C9
2
H3
10/17/2011
Sheet of
D:\!Works\..\jFet-Preamp-Stereo.SchDoc
Drawn By:
1
3
A
Date:
File:
2
C7 47nF
+15V
2
Title
GND
C
-15V Clean
3
47uF 60V
C7
P3
Pot stereo
100kA
7
GND
GND
R9
220
R6
4.7k
TL072ACN
GND
The Picasa album about jFET amplifier
Resistor
B
R7
1M
C
GND
GND
1
10uF
R5
4.7k
4
6
GND
GND
5
Header 2
10uF
U1B
6
C4
H1
B
100k
5
C
GND
C6
68p
R4
+15V Clean
2
1
2
3
C5
R3
22K
GND
1
1
GND
P2
R6
5.1K
P2
Pot stereo
47kB
TL072ACN
R2
1M
P1
GND
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
C2
6
100k
2
GND
5
C2
C1
P1
C1 10uF
1
B
7
8
9
10
11
12
Header 6X2A
Out 1
H1
4
P4
A
2
3
6
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
3
Preamplifiers for musical instruments and home hi-fi
10/17/2011
Sheet of
D:\!Works\..\OPAMP-Preamp-Stereo.SchDocDrawn By:
4
5
6
The Picasa album about OpAmp amplifier
Description
Comment
Capacitor
Cap
Value
68p
Quanti
ty
Footprint
Capacitor; 2 Leads
C7, C8
Capacitor; 2 Leads
C11, C13
Polarized Capacitor (Radial)
Cap Pol1
10uF
Cap
47nF
Polarized Capacitor (Radial)
Cap Pol1
47uF 60V
2 RAD-0.3
Elco 12 mm, 2
2 mil pins
Capacitor
Cap
100nF
2 RAD-0.3
C9, C10
Panel Connector
3 3 input Small
H1, H2, H3
Connector
Input Jack
6.3
Header, 2-Pin
Header 2
Resistor
Pot stereo
47kB
Resistor
Pot stereo
Header
6X2A
100kA
Model:Footprint
C1, C5
C2, C3, C4, C6, C12,
6 Cap, Tantal, 1mil C14
Capacitor
Header, 6-Pin, Dual row
Designator
2 RAD-0.3
1 Jack input 6.3
J1
1 HDR1X2
Pots Plastic
1 Stereo
Pots Plastic
1 Stereo
P1
1 HDR2X6_CEN
P4
1 29-04
Q1
1 29-04
Q2
Capacitor; 2 Leads
3 pin, 2 mil connector
Connector; Header; 2 Position
P2
P3
Resistor
Res2
100k
2 AXIAL-0.4
R1, R4
Resistor
Res2
1M
2 AXIAL-0.4
R2, R7
Resistor
Res2
22K
1 AXIAL-0.4
R3
Resistor
Res2
4.7k
2 AXIAL-0.4
R5, R6
Connector; Header; 6x2 Position
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)
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
Res2
12K
2 AXIAL-0.4
R8, R9
Resistor; 2 Leads
1 dip-8
U1
DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
Amplifier Transistor NPN Silicon BC548C
Low Noise Transistor PNP
Silicon
BC560C
Low-Noise J-FET Dual Operational
TL072ACN
Amplifier
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: 19 October 2011 7:39 PM
Preamplifiers for musical instruments and home hi-fi
- 6
7 -
Schematics and Bill of materials for instrument preamplifiers
Stereo circuit with 2 single OpAmp, instrument and audio preamplifier
1
2
3
4
5
6
Preamplifiers for musical instruments and home hi-fi
Schematics and Bill of materials for instrument preamplifiers
Stereo low noise 2 single OpAmp instrument preamplifier
1
Notes
2
3
4
5
6
Notes
P4
Header 6X2A
P2
Pot stereo
47kB
C1
1
2
3
C2
68p
J1
0
1
2
3
4
5
C3
10uF
C4
10uF
2
Input Jack 6.3
GND
P1
2
1
Header 2
1
GND
GND
B
5
LF356D
C6
C5
10uF
68p
R4
R3
22K
100k
7
+15V Clean
U4
2
8
R6
4.7k
P3
Pot stereo
100kA
5
4
1
R7
1M
R5
4.7k
6
3
C
H1
U3 8
3
R2
1M
GND
GND
6
4
B
10uF
100k
7
R1
C
LF356D
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 for example really noiseless single
LF or LT serial integrated
circuits instead of relative
noisy one dual TL072.
-15V Clean
-15V
C7 47nF
C8 47nF
3
+15V
1
Q1
C9
47uF 60V
2
D
H3
Q2
R8
3
12K
C11100nF
BC548C
C12
10uF
10uF
C14
100nF
C13
BC560C
R9
C10
12K
47uF 60V
GND
1
D
Title
GND
Size
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
1
2
C2
68p
R1
Value
Stereo single OpAmp preamp w. power filter
Number
Revision
A
Date:
File:
3
Quanti
ty
Comment
Capacitor
68p
2 Cap
Polarized Capacitor (Radial)
10uF
6 Cap Pol1
Capacitor
47nF
2 Cap
10/17/2011
Sheet of
D:\!Works\..\LF356-Preamp-Stereo.SchDoc Drawn By:
4
Footprint
5
Designator
RAD-0.3
6
Capacitor; 2 Leads
C7, C8
Capacitor; 2 Leads
C11, C13
Polarized Capacitor (Radial)
47uF 60V
2 Cap Pol1
Capacitor
100nF
2 Cap
RAD-0.3
C9, C10
Panel Connector
3 Connector 3 input Small
H1, H2, H3
Input Jack
1 6.3
Jack input 6.3
J1
1 Header 2
Resistor
47kB
1 Pot stereo
Resistor
100kA
1 Pot stereo
Header
1 6X2A
Header, 6-Pin, Dual row
Model:Footprint
C1, C5
C2, C3, C4, C6, C12,
Cap, Tantal, 1mil C14
RAD-0.3
Elco 12 mm, 2
mil pins
Header, 2-Pin
J1
B
C4
10uF
Input Jack 6.3
2
1
Header 2
GND
HDR1X2
Pots Plastic
Stereo
Pots Plastic
Stereo
P1
HDR2X6_CEN
P5
Capacitor; 2 Leads
3 pin, 2 mil connector
Connector; Header; 2 Position
P2
P3
10uF
100k
+15V Clean
3
3
2
C
H3
GND
1
P3
Pot stereo
100kA
1
8
R7
1M
R6
4.7k
6
3
1
R5
4.7k
U2
5
2
2
H2
B
C6
68p
R4
C
-15V Clean
C7 47nF
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.
+15V
C10
C8 47nF
47uF 60V
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.
Q1
C15 47nF
100nF
BC548C
C16
C18
47uF 60V
Q3
R10
12K
100nF
10uF
BC548C
C22
C20
10uF
100nF
C21
1
Capacitor
2
C19
12K
47uF 60V
Title
R9
C11
12K
47uF 60V
GND
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
D
Stereo preamp w. 2 single OpAmp and 2 power filters
Size
Number
Revision
Value
68p
Quanti
ty
Comment
2 Cap
10/17/2011
Sheet of
D:\!Works\..\LT1115-Preamp-Stereo.SchDocDrawn By:
4
Footprint
5
Designator
RAD-0.3
6
Model:Footprint
Polarized Capacitor (Radial)
10uF
8 Cap Pol1
C1, C5
C2, C3, C4, C6, C12,
Cap, Tantal, 1mil C14, C20, C22
Capacitor
47nF
4 Cap
RAD-0.3
C7, C8, C15, C16
Capacitor; 2 Leads
Capacitor
100nF
4 Cap
C9, C13, C17, C21
Capacitor; 2 Leads
Polarized Capacitor (Radial)
47uF 60V
4 Cap Pol1
RAD-0.3
Elco 12 mm, 2
mil pins
Header, 2-Pin
1 Header 2
Resistor
47kB
1 Pot stereo
Resistor
100kA
1 Pot stereo
Header
1 6X2A
Header, 6-Pin, Dual row
HDR1X2
Pots Plastic
Stereo
Pots Plastic
Stereo
Capacitor; 2 Leads
C10, C11, C18, C19
Panel Connector
3 Connector 3 input Small
H1, H2, H3
Input Jack
1 6.3
Jack input 6.3
J1
P1
3 pin, 2 mil connector
Connector; Header; 2 Position
P2
Resistor
100k
2 Res2
AXIAL-0.4
R1, R4
Resistor
1M
2 Res2
AXIAL-0.4
R2, R7
Resistor
22K
1 Res2
AXIAL-0.4
R3
Resistor
4.7k
2 Res2
AXIAL-0.4
R5, R6
Connector; Header; 6x2 Position
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)
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
HDR2X6_CEN
P4
29-04
Q1, Q3
2 BC560C
29-04
Q2, Q4
Resistor
12K
4 Res2
AXIAL-0.4
R8, R9, R10, R11
Resistor; 2 Leads
U1, U2
DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
AXIAL-0.4
R2, R7
Resistor
22K
1 Res2
AXIAL-0.4
R3
Resistor
4.7k
2 Res2
AXIAL-0.4
R5, R6
Resistor
12K
2 Res2
AXIAL-0.4
R8, R9
Resistor; 2 Leads
DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm
Ultra Low Noise Precision High-Speed Operational Amplifier
2 LT1028CN8 dip-8
Amplifier Transistor NPN Silicon
Low Noise Transistor PNP
Silicon
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.
P3
2 BC548C
2 Res2
U3, U4
R11
3
1M
dip-8
BC560C
A
Resistor
Q2
GND
Date:
File:
R1, R4
29-04
100nF
C13
47nF
BC560C
AXIAL-0.4
1 BC560C
C14
Q4
C17
2 Res2
Q1
C12
10uF
10uF
-15V Clean 1
D
100k
29-04
Q2
C9
R8
12K
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.
LT1028CN8
GND
GND
Resistor
1 BC548C
Wide-Bandwidth Single J-FET Operational Amplifier2 LF356D
LT1028CN8
C5
R3
22K
GND
H1
1
8
GND
P1
GND
6
3
R2
1M
2
3
GND
5
2
C3
10uF
0
1
2
3
4
5
Connector; Header; 6x2 Position
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)
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
Amplifier Transistor NPN Silicon
Low Noise Transistor PNP
Silicon
U1
1
10uF
100k
+15V Clean 1
Description
Description
P2
Pot stereo
47kB
C1
GND
GND
2
A
Header 6X2A
-15V
H2
7
8
9
10
11
12
7
A
1
2
3
4
5
6
A
4
A
7
8
9
10
11
12
7
1
2
3
4
5
6
4
P5
Document last modified and saved: 19 October 2011 7:39 PM
- 8
Preamplifiers for musical instruments and home hi-fi
9 -
Preamplifiers for musical instruments and home hi-fi
Schematics and Bill of materials for instrument preamplifiers
Schematic and BOM of power supply
1
2
3
4
A
R1
15V AC - 1
KBL04
C6
47n
3
B
D1
C1
2200u
10 1W
LM317BT
U1
IN
OUT
ADJ
6
A
2
+15V Out
1
3
5
+15V In
C2
2200u
C4
100n
D2
16V Zener
C3
47u
C5
100n
C7
47n
1
2
B
2
1
GND
15V AC - 2
H1
C8
47n
C9
47n
3
GND
2200u
C11
C10
2200u
R2
D3
16V Zener
100n
C13
-15V In
C14
100n
-15V Out
1
10 1W
C12
47u
H2
C
2
ADJ
IN
OUT
C
3
U2
LM337BT
Title
Power supply
Size
D
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
1
2
Number
Revision
D
A
Date:
File:
3
10/17/2011
D:\!Works\..\Power supply.SchDoc
4
Sheet of
Drawn By:
5
6
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.
Description
Comment
Quanti
ty
Value
Polarized Capacitor (Radial)
Cap Pol1
4 2200u
Polarized Capacitor (Radial)
Cap Pol1
2 47u
Footprint
ELCO 22 MM 4
MIL
Elco 12 mm, 2
mil pins
Capacitor
Cap
4 100n
RAD-0.3
Designator
C1, C2, C10, C11
C4, C5, C13, C14
Boards for
instrument preamps
project
Model:Footprint
C3, C12
Radial Cap, Thru-Hole; 2 Leads; 0.3 in Pin
Spacing
Radial Cap, Thru-Hole; 2 Leads; 0.3 in Pin
Spacing
Capacitor
Cap
4 47n
RAD-0.3
C6, C7, C8, C9
Full Wave Diode Bridge
KBL04
1
Bridge hor.
D1
Zener Diode
16V Zener
2
Connector
2
DIODE-0.7
D2, D3
panel connector
3 input big
H1, H2
Res2
2 10 1W
AXIAL-0.4
R1, R2
LM317BT
1
221A-04
U1
3 pin, 3 mil connector
Axial Device, Thru-Hole; 2 Leads; 0.4 in Pin
Spacing
TO, Thru-Hole, Vertical, Heatsink Mounted; 3 InLine Leads; Pitch 2.54 mm
3-Terminal Adjustable Negative Voltage
LM337BT
Regulator 1
221A-04
U2
TO, Thru-Hole, Vertical, Heatsink Mounted; 3 In-Line Leads; Pitch 2.54 mm
Resistor
3-Terminal Adjustable Positive
Voltage Regulator
Printed Circuit
Diode, Thru-Hole; 2 Leads; 0.7 in Pin Spacing
Document last modified and saved: 19 October 2011 7:39 PM
Preamplifiers for musical instruments and home hi-fi
- 10
11 -
Preamplifiers for musical instruments and home hi-fi
PCB for the instrument preamps
Top and bottom PCBs and overlay of INA217 microphone preamp
PCB TOP OVERLAY
C7
R4
C18
U3
D2
C19
C6
R12
C8
D1
R14
R13
C9
R9 R8
C17
C16
C15
C12
R15
C11
D4 D3
R7 R6 R5
P2
R10
R11
P1
Q4
3
1
Q2
U2
C1
R3 R2
C21
C2
R16
Q3
C4
C5
C14
C10
3
1
3
1
TOP LAYER
3
1
C13
U1
Q1
C22
C23
C20
C3
J1
R1
R17
H1
H2
C18
U3
R7 R6 R5
R14
R13
C9
C17
R12
C8
C16
P2
R10
R11
C6
D1
R9 R8
H5
C7
R4
D2
C19
H4
H3
C15
C12
P1
Q2
U2
C1
R3 R2
C13
U1
C21
C2
R16
3
1
Q3
C14
C10
C4
3
1
BOTTOM LAYER
C5
3
1
3
1
Q4
Q1
C22
C23
C20
C3
J1
R1
R17
H2
H1
H3
H4
TOP OVERLAY ON TOP LAYER
R15
C11
D4 D3
H5
Document last modified and saved: 19 October 2011 7:39 PM
- 12
Preamplifiers for musical instruments and home hi-fi
13 -
PCB for the instrument preamps
Top and bottom PCBs and overlay of stereo jFET preamp
Preamplifiers for musical instruments and home hi-fi
PCB for the instrument preamps
Top and bottom PCBs and overlay of simple dual OpAmp preamp
BOTTOM LAYER
TOP LAYER
TOP LAYER
BOTTOM LAYER
TOP OVERLAY ON TOP LAYER
OVERLAY ON TOP LAYER
PCB TOP OVERLAY
H1
P2
P1
Q1
1
7
5
R6
C3
C4
C1
H3
C6
C1
R10R2
C2
C6
R10R2
H2
C12
3
1
C8
R8
Q1
C8
C7
P3
C9
R8
Q1
C8
C7
Q2
C5
R6 R7
C5
R6 R7
R9
C10
C9
R9
C10
C8
P3
P3
C12
Q2
Q2
Q2
R1 R5
U1
C14
J1
J1
H2
C2
C4
C13
3
1
H3
C7
C3
3
1
C5
R9
C3
3
1
R7
C5
R1 R5
U1
C1
C14
R9
C7
C13
C1
3
1
R7
R1
R2
C11
H1
R2
C11
H1
C3
R1
R8
R6
H3
R8
R4
H3
3
1
H1
3
R5
H2
R4
P2
H2
P2
P2
R5
1
R3
5
Q1
7
3
R3
P1
PCB OVERLAY
C6
R4 R3
C4
J1
C6
R4 R3
C4
J1
C2
P1
C2
P3
P1
Document last modified and saved: 19 October 2011 7:39 PM
- 14
15 -
PCB for the instrument preamps
Top and bottom PCBs and overlay of power filters (ver.2)
Notes
Notes
We have 3 versions of power filter PCB. No difference between schematics, the one of them is
landscape, the another 2 is portrait.
We have 3 versions of
power filter PCB. No
difference
between
schematics, the one of
them is landscape, the
another 2 is portrait.
C3
C2
C3
7
P11
C4
C4
3
1
3
1
C2
R2
C1
R2
3
1
OVERLAY ON TOP LAYER
3
1
C8
C8
R1
C1
C2
C6
C2
C6
C3
C8
C3
C8
P1
P1
12
6
Q2
C7
7
1
R1
3
1
C6
C5
C7
R1
C1
Q2
C7
Q1
3
1
Q2 R2
C6
12
6
C5
7
P11
R1
C1
Q1
Q1
3
1
C7
3
1
Q2 R2
PCB OVERLAY
Q1
C5
C5
C4
PCB OVERLAY
OVERLAY ON TOP LAYER
C4
TOP LAYER
TOP LAYER
BOTTOM LAYER
PCB for the instrument preamps
Top and bottom PCBs and overlay of power filters (ver.3)
Preamplifiers for musical instruments and home hi-fi
BOTTOM LAYER
Preamplifiers for musical instruments and home hi-fi
12
6
7
1
12
6
Document last modified and saved: 19 October 2011 7:39 PM
Preamplifiers for musical instruments and home hi-fi
- 16
17 -
PCB for the instrument preamps
Top and bottom PCBs and overlay of power filters (ver.1)
Preamplifiers for musical instruments and home hi-fi
PCB for the instrument or hi-fi preamps
Two single OpAmp - stereo universal preamp
TOP 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.
TOP LAYER
BOTTOM LAYER
BOTTOM LAYER
OVERLAY ON TOP LAYER
C3 C8
H3
Q1
3
1
Q1
P1
12
6
C7
PCB OVERLAY
C10
C7
C4
C10
P3
Q2
P3
Q2
C4
C14
H1
C14
H1
3
1
R2
P2
R9 R8 R7 C9
H3
7
1
P2
R9 R8 R7 C9
H2
3
1
R1
H2
3
1
C6 C2
3
1
C5
C7
Q2
Q1
C1
C4
3
1
PCB OVERLAY
R6 R5
R6 R5
C12
3
1
C12
R2
C4
R1
3
1
C5
C7
Q2
C6 C2
Q1
C1
C8
C1
C3 C8
C13
P1
7
1
U3
12
6
R2
C8
C11
C1
R2
C11
C2
C2
C13
U4
J1
J1
C3
R1 R4 C5
U4
C3
U3
R1 R4 C5
R3 C6
R3 C6
P1
OVERLAY ON TOP LAYER
P1
Document last modified and saved: 19 October 2011 7:39 PM
- 18
Preamplifiers for musical instruments and home hi-fi
19 -
PCB for the instrument or hi-fi preamps
Two single OpAmp - stereo low noise universal preamp
PCB for the instrument or hi-fi preamps
Switch module for preamps
1
TOP LAYER
BOTTOM LAYER
Preamplifiers for musical instruments and home hi-fi
2
3
4
5
6
A
A
6
5
4
1
A/B Switch
B
2
1
SW1
A/B Switch
3
6
5
4
3
4
2
SW2
P5
12
11
10
9
8
7
6
5
4
3
2
1
2
5
3
A/B Switch
SW3
1
B
6
Header 6X2A
C
C
http://custompcb.blogspot.com/
http://diyguitarpa.blogspot.com/
Title
Switch module
Size
Number
Revision
A
D
Date:
File:
1
10/18/2011
D:\!Works\..\Switches.SchDoc
2
3
D
Sheet of
Drawn By:
4
5
6
TOP LAYER
BOTTOM LAYER
OVERLAY ON TOP LAYER
H2
H3
C22
C20
C22
C18
C21 R10R11 C19
C17 Q4
C20
C15 C16 C14
3
1
C13
R8 R9
P3
C12
3
1
3
1
Q2
Q1
C9
C11
C4
U1
C10
C3
C6
Q2
R2
U2
R7
R1
R3
R4
C5
C7
Q1
R6
C3
C4
U1
C6
C2
R5
C2
R2
C1
R5
C1
P3
C12
R6
3
1
3
1
C5
C7
R8 R9
P1
J1
C8
U2
R7
P1
J1
R1
R3
R4
PCB OVERLAY
C9
C13
3
1
3
1
C11
C8
C15 C16 C14
3
1
Q3
C10
Q3
P2
C17 Q4
P2
H1
7
1
H2
H3
7
1
PCB OVERLAY
H1
C18
C21 R10R11 C19
OVERLAY ON TOP LAYER
Document last modified and saved: 19 October 2011 7:39 PM
Preamplifiers for musical instruments and home hi-fi
- 20
21 -
Preamplifiers for musical instruments and home hi-fi
PCB for the instrument or hi-fi preamps
The PCB of power supply
TOP LAYER
PCB OVERLAY
H1
D1
U1
R1
1 2 3
C5
C9
C1
C8
C2
C6
U2
1 2 3
C14
D2
C12
R2
C7
C4
D3
C10
C11
C3
H2
C13
OVERLAY ON TOP LAYER
BOTTOM LAYER
H1
D1
U1
R1
1 2 3
C5
C9
C1
C8
C2
C6
1 2 3
C14
D2
C12
R2
C4
U2
C7
C10
D3
C11
C3
H2
C13
Document last modified and saved: 19 October 2011 7:39 PM
Preamplifiers for musical instruments and home hi-fi
- 22
23 -
Preamplifiers for musical instruments and home hi-fi
Images about the prototypes of this preamp project
The selectable prototype of jFEt and OpAmp projects
The Picasa gallery about this circuit
Images and Picasa
galleries about the
prototype of preamps
Document last modified and saved: 19 October 2011 7:39 PM
Preamplifiers for musical instruments and home hi-fi
- 24
25 -
Preamplifiers for musical instruments and home hi-fi
Images about the prototypes of this preamp project
Audio mixer with jFET and OpAmp preamps
Images about the prototypes of this preamp project
Microphone 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
Document last modified and saved: 19 October 2011 7:39 PM
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
Link to this page
Permanent link
Use the permanent link to the download page to share your document on Facebook, Twitter, LinkedIn, or directly with a contact by e-Mail, Messenger, Whatsapp, Line..
Short link
Use the short link to share your document on Twitter or by text message (SMS)
HTML Code
Copy the following HTML code to share your document on a Website or Blog