Preamps public doc

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