Expandable Modular Mixer public doc

Expandable Modular Audio Mixer for any channels P1 P21 P12 P13 R15 R16 R18 R9 R8 R19 R10 R14  1 2 Printed Circuit Boards for instrument and hi-fi preamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Top and bottom PCBs and overlay of stereo jFET preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Top and bottom PCBs and overlay of simple dual OpAmp preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Top and bottom PCBs and overlay of INA217 microphone preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Two single OpAmp - stereo universal preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Two single OpAmp - stereo low noise universal preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Top and bottom PCBs and overlay of power filters (ver.3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Top and bottom PCBs and overlay of power filters (ver.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Top and bottom PCBs and overlay of power filters (ver.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Top and bottom PCBs and overlay of power filters (ver.4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Top and bottom PCBs and overlay of power filters (ver.5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Switch module for preamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 The PCB of power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Variable line output board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Simple headphone amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Balanced headphone amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Images and Picasa galleries about the prototype of this project . . . . . . . . . . . . . . . . . . . . . . 38 Modelling the PCBs of this project before manufacturing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Examples how to setup the 3 stages of mainboards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 The selectable prototype of jFEt and OpAmp projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Audio mixer with jFET and OpAmp preamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Microphone preamp with INA217 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 5 6 -15V 1 2 3 4 5 6 A GND 7 8 9 10 11 12 A +15V GND Header 6X2A +15V a1 R9 1 8 P1 1.6kA 6.8K 3 2 C12 47uF 60V C13 47uF 60V R13 2.2K GND REF R4 1K GND R7 RG_1 RG_2 INA217 AIP V_OUT R10 1M GND C11 10uF J1 R11 100K 7 C 6 P2 47kB U3 OPA137 2 4 3 -15V a2 GND GND +15V a2 10uF 47uF 60V R12 470 C14 100nF GND 2 C10 3 6 V_IN- R14 2.2K U2 OPA137 470 6 V_IN+ R5 1K 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 Header 6X2A 12 11 10 9 8 7 6.8K U1 R1 47K 6 5 4 3 2 1 8 R8 5 7 D2 1N4148 4 R6 B D4 1N4148 0 1 2 3 4 5 D1 1N4148 4 -15V a1 D3 1N4148 P3 Bal In 2 GND P6 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 Mainboards for any channels expandable modular audio mixer . . . . . . . . . . . . . . . . . . . . . 31 Schematic, BOM and PCB for any channel mixer mainboard stage1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Schematic, BOM and PCB for any channel mixer mainboard stage2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Schematic, BOM and PCB for any channel mixer mainboard stage3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4 P5 Schematics and BOM for expandable mixer project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Schematic and BOM of cheap microphone preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Stereo jFET guitar (instrument, effect) preamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Stereo dual OpAmp instrument or audio preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Stereo circuit with 2 single OpAmp, instrument and audio preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Stereo low noise 2 single OpAmp instrument or hi-fi preamplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Schematic and BOM of power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Schematic and BOM of power filter module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Schematic and BOM of variable line output module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Schematic and BOM of simple headphone output module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Schematic and BOM of balanced headphone output module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3 V- 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 Schematics and Bill of materials for modular mixer Schematic and BOM of cheap microphone preamp 7 This project is similar than my “Modular audio mixer”, but the another is made for 4 or 8 channel mixers only, this mixer is expandable to any inputs and any outputs. The input preamplifiers of this project is same than in the simple modular mixer, but I have new line output and headphone amplifier modules. With this mixer, have 3 stages of mainboards. The first is the required only, this is 4 channel inputs and power supply connectors. But the first board can be continued with 2nd and 3rd stages. The 2nd stage made for 2 channel inputs, the 3rd for line or headphone outputs. Modular audio mixer for any channel inputs V+ Schematics and BOM for expandable mixer project 3 - 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 main 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 first stage of mainboard of audio mixer via 2x6 pin male “L” header. Document last modified and saved: 11 November 2011 5:40 PM 0 Ft  Modular audio mixer for any 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 any 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 5:40 PM  Modular audio mixer for any 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 dual 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 or hi-fi preamplifier 4 1 Modular audio mixer for any 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 5:40 PM  Modular audio mixer for any 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: 10/11/2011 D:\!Works\..\PowerFilter.SchDoc 3 Value BC550C BC560C 12K 10uF 100nF 47nF 47uF 60V 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 any channel inputs This module required for the preamplifier boards. This 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 5:40 PM  Modular audio mixer for any channel inputs - 10 11 - Schematics and Bill of materials for modular mixer Schematic and BOM of variable line output module Schematics and Bill of materials for modular mixer Schematic and BOM of simple headphone output module 1 1 2 3 4 5 Modular audio mixer for any channel inputs 2 3 4 5 6 6 R1 A 1k R2 A A 4 +15V clean U1A TL074J 2 R5 3 A 1 R1 100 U1B TL074J 6 R6 B 5 GND GND 1 2 3 4 5 6 GND 7 8 9 10 11 12 U1D TL074J 13 R8 12 D 14 1k R4 100 4 100k GND 1 2 3 4 5 6 GND R5 P2 Pot stereo 47k Header 6X2A P1 GND Header 6X2A 21 GND +15V GND 3 18 -15V 1 20 +15V J1 C 0 1 2 3 Pot stereo 47kB -15V Jack input 3.2 J2 GND J4 0 1 2 3 4 5 Bill of Materials Title C2 100n B C1 100uF 25V C3 100n 2 Size Footprint AXIAL-0.4 AXIAL-0.4 HDR2X6_CEN J014 JACK INPUT 3.2 Jack input 6.3 Pots Plastic Stereo Stereo RCA input Value 100 100k 47k Date: outputsFile: Mixer Stage3.PrjPcb Quantity 4 4 2 1 1 2 1 1 Number D C4 100uF 25V 11/11/2011 D:\!Works\..\Mixer outputs.SchDoc 4 Description Resistor Resistor Header, 6-Pin, Dual row Low-Noise JFET-Input Operational Amplifier Resistor 11/10/2011 http://custompcb.blogspot.com/ http://diyguitarpa.blogspot.com/ Sheet of Drawn By: 5 Model:Footprint Resistor; 2 Leads Resistor; 2 Leads Connector; Header; 6x2 Position DIP; 14 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm 6 17:50:29 Headphone amp for modular Mixer mainboard stage 3 Size Revision 1 Designator #Column Name Error:Price #Column Name Error:PriceH Total Total H 2 R1, R2, R3, R4 $0.00 0 Ft 2 R5, R6, R7, R8 $0.00 0 Ft 12 P1, P3 $0.00 0 Ft 14 U1 $0.00 0 Ft Comment 5 J1 $0.00 0 Ft Res2 6 J3, J4 $0.00 0 Ft Res2 6 P2 $0.00 0 Ft Cap 3 J2 $0.00 0 Ft Number D Revision A Date: File: 2 11/11/2011 D:\!Works\..\HF-TPA6120.SchDoc 3 Sheet of Drawn By: 4 5 6 Pins Notes This is the PCB for line level mixer outputs with volume level stereo potentiometer. Have to be connected to the stage no.3 of mixer mainboard. This stage of mixer have balance adjustment feature if required. With this board, you have two line outputs with variations: 2 pcs 6.3mm jack 1 pcs 6.3mm jack and 1 pcs 3.2mm jack 1 pcs 6.3mm jack and 1 pcs stereo RCA 1 pcs 3.2mm jack and 1 pcs stereo RCA D A GND 3 Title Output module for Mixer mainboard stage 3 16 • • • • P2 Header 6X2A http://custompcb.blogspot.com/ http://diyguitarpa.blogspot.com/ Input Jack 6.3 GND Res2 Res2 Header 6X2A TL074J Jack input 3.2 Input Jack 6.3 Pot stereo Stereo RCA 6 7 8 9 10 11 12 13 14 15 GND 0 1 2 3 4 5 Input Jack 6.3 Comment LVCCRVCC- 19 C 1 2 3 4 5 6 GND Stereo RCA 1 LVCC+ RVCC+ Input Jack 6.3 TPA6120 7 8 9 10 11 12 2 D GND 10 1 0 J3 NC NC NC NC NC NC NC NC NC NC R4 2 J1 GND GND C C 5 ROUT RIN- 1k B B RIN+ 16 10 LOUT LIN- 17 R6 GND LIN+ 5 1k 7 8 9 10 11 12 5 4 3 2 1 0 R3 U1 P1 GND P3 C 10 8 R3 100 100k -15v clean B U1C TL074J 9 R7 100k 11 100k 7 R2 100 A GND Bill of Materials SUM: $0.00 Cap Pol1 0 Ft Header 6X2A Input Jack 6.3 Pot stereo TPA6120 Footprint AXIAL-0.4 AXIAL-0.4 CAP, 2 and 3 MIL Elco 6mm, 1 mil pins HDR2X6_CEN Jack input 6.3 Pots Plastic Stereo Powerpad 20 Value 10 1k 100n 100uF 25V 47kB TPA6120 Simple Mod.PrjPcb Quantity 2 4 2 2 1 1 1 1 11/10/2011 Description Resistor Resistor Capacitor Polarized Capacitor (Radial) Header, 6-Pin, Dual row Resistor 17:52:41 Model:Footprint Resistor; 2 Leads Resistor; 2 Leads Connector; Header; 6x2 Position Pins Designator #Column Name Error: R3, R4 $0. 2 R1, R2, R5, R6 $0. 2 C2, C3 $0. 2 C1, C4 $0. 12 P2 $0. 6 J1 $0. 6 P1 $0. 21 U1 $0. 2 14 SUM: $0 Notes This is the circuit for headphone output for mixer with volume level stereo potentiometer. Have to be connected to the stage no.3 of mixer mainboard. This stage of mixer have balance adjustment feature if required. This board contains SMD circuit. TPA6120 is the one of the best class-D headphone amplifier with 120dB dynamics. This is the smallest, cheapest, and simplest application of this module. Document last modified and saved: 11 November 2011 5:40 PM  Modular audio mixer for any channel inputs - 12 13 - Modular audio mixer for any channel inputs Schematics and Bill of materials for modular mixer Schematic and BOM of balanced headphone output module 4 6 2 5 C7 100p 4 R11 4.7k 22uF 25V U2B NE5532AP 7 10k R9 100k 6 5 R12 4.7k GND 5 U3B NE5532AP R1 22uF 25V C8 100p 1k R2 R10 100k 7 2 GND U1 R17 150 B C9 1k R13 GND 1 R19 22uF 25V 100k 2 C10 R20 22uF 25V 100k GND 1 2 NE5532AP P1 C11 100p GND GND 3 18 -15V 1 20 GND LOUT ROUT NC NC NC NC NC NC NC NC NC NC GND LVCC+ RVCC+ LVCCRVCC- Pot stereo 47kB 2 19 6 7 8 9 10 11 12 13 14 15 R4 10 R3 10 GND Header 6X2A GND GND 1 2 3 4 5 6 Printed Circuit J1 Input Jack 6.3 C P4 7 8 9 10 11 12 B TPA6120 GND GND 7 8 9 10 11 12 Header 6X2A 7 8 9 10 11 12 1 2 3 4 5 6 C12 100p +15V P2 Header 6X2A 1 2 3 4 5 6 P3 RIN- 21 GND C RIN+ 16 3 1 GND LIN- 17 1k R16 U3A R18 150 3 1 LIN+ 5 1k R14 1k R15 U2A NE5532AP A 1k 4 GND 6 C6 R7 8 8 10k A 3 0 1 2 3 4 5 2 C5 R5 4 1 C2 100n C3 100n C1 100uF 25V C4 100uF 25V GND GND Boards for Title Balanced headphone amp for modular Mixer mainboard stage 3 D Size http://custompcb.blogspot.com/ http://diyguitarpa.blogspot.com/ 1 2 3 Bill of Materials Comment Res2 Res2 Res2 Res2 Res2 Res2 Cap Cap Cap Pol1 NE5532AP Cap Pol1 Header 6X2A Input Jack 6.3 Pot stereo TPA6120 Footprint AXIAL-0.4 AXIAL-0.4 AXIAL-0.4 AXIAL-0.4 AXIAL-0.4 AXIAL-0.4 CAP, 2 and 3 MIL CAP, Ceramic, 1MIL Cap, Tantal, 1mil dip-8 Elco 6mm, 1 mil pins HDR2X6_CEN Jack input 6.3 Pots Plastic Stereo Powerpad 20 Value 10 100k 10k 150 1k 4.7k 100n 100p 22uF 25V 100uF 25V 47kB Date: File: Quantity 5 Resistor D 6 11/10/2011 Description Resistor Resistor Resistor Resistor Resistor Resistor Capacitor Capacitor Polarized Capacitor (Radial) Dual Low-Noise Operational Amplifier Polarized Capacitor (Radial) Header, 6-Pin, Dual row Revision 11/11/2011 Sheet of D:\!Works\..\HF-TPA6120 Balanced.SchDocDrawn By: 4 TPA6120 Balanced Mod.PrjPcb 2 4 2 2 6 2 2 4 4 2 2 3 1 1 1 Number A 17:54:20 Model:Footprint Resistor; 2 Leads Resistor; 2 Leads Resistor; 2 Leads Resistor; 2 Leads Resistor; 2 Leads Resistor; 2 Leads DIP; 8 Leads; Row Spacing 7.62 mm; Pitch 2.54 mm Connector; Header; 6x2 Position Pins Designator #Column Name Error:Price #Column Name Error:PriceH Total Total H R3, R4 $0.00 0 Ft 2 R9, R10, R19, R20 $0.00 0 Ft 2 R5, R7 $0.00 0 Ft 2 R17, R18 $0.00 0 Ft 2 R1, R2, R13, R14, R15, R16 $0.00 0 Ft 2 R11, R12 $0.00 0 Ft 2 C2, C3 $0.00 0 Ft 2 C7, C8, C11, C12 $0.00 0 Ft 2 C5, C6, C9, C10 $0.00 0 Ft 8 U2, U3 $0.00 0 Ft 2 C1, C4 $0.00 0 Ft 12 P2, P3, P4 $0.00 0 Ft 6 J1 $0.00 0 Ft 6 P1 $0.00 0 Ft 21 U1 $0.00 0 Ft 2 38 SUM: $0.00 instrument and hi-fi preamps 0 Ft Notes This is the circuit for headphone output for mixer with volume level stereo potentiometer. Have to be connected to the stage no.3 of mixer mainboard. This stage of mixer have balance adjustment feature if required. This board contains SMD circuit. TPA6120 is the one of the best class-D headphone amplifier with 120dB dynamics. This module contains unbalanced/balanced converter for better result. If this feature not required, use the previous version of this schematic. Document last modified and saved: 11 November 2011 5:40 PM  Modular audio mixer for any channel inputs - 14 15 - PCB for the modular audio mixer Top and bottom PCBs and overlay of stereo jFET preamp Modular audio mixer for any channel inputs PCB for the modular audio mixer Top and bottom PCBs and overlay of simple dual OpAmp preamp BOTTOM LAYER TOP LAYER PCB TOP OVERLAY TOP OVERLAY ON TOP LAYER P1 Q1 R3 7 R1 3 P2 R8 R1 C3 C4 C1 C2 C8 P3 C2 R6 R7 C6 Q2 C5 R6 R7 C6 C2 C2 R10R2 C4 C4 J1 R4 R3 R4 R3 J1 J1 3 1 J1 P1 P1 12 6 P4 7 1 P3 7 1 12 6 P4 C1 C5 P3 R10R2 C4 C6 C6 Q2 C3 3 1 C7 C5 C8 C7 C5 R9 R7 R1 R5 C1 R9 R7 R6 P2 U1 P3 R6 12 6 R4 R1 R5 C1 U1 P5 7 1 R5 R2 R8 5 1 C3 12 6 R3 OVERLAY ON TOP LAYER P2 3 P2 R4 PCB OVERLAY P5 7 1 P1 Q1 R2 BOTTOM LAYER 5 1 R5 C3 7 TOP LAYER Document last modified and saved: 11 November 2011 5:40 PM  Modular audio mixer for any channel inputs - 16 17 - Modular audio mixer for any 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 5:40 PM