microphone-preamp.sch

EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 1 1
Title "Microphone preamp with phantom power"
Date "2021-09-21"
Rev "v1.0.0"
Comp "Jan Knipper"
Comment1 "github.com/polykit"
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Amplifier_Instrumentation:INA128 U1
U 1 1 614B09B4
P 6250 3850
F 0 "U1" H 6694 3896 50  0000 L CNN
F 1 "INA217" H 6694 3805 50  0000 L CNN
F 2 "Package_DIP:DIP-8_W7.62mm_Socket_LongPads" H 6350 3850 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/ina128.pdf" H 6350 3850 50  0001 C CNN
	1    6250 3850
	1    0    0    -1  
$EndComp
$Comp
L power:+12V #PWR0101
U 1 1 614B1213
P 6250 3550
F 0 "#PWR0101" H 6250 3400 50  0001 C CNN
F 1 "+12V" H 6265 3723 50  0000 C CNN
F 2 "" H 6250 3550 50  0001 C CNN
F 3 "" H 6250 3550 50  0001 C CNN
	1    6250 3550
	1    0    0    -1  
$EndComp
$Comp
L power:-12V #PWR0102
U 1 1 614B1D2E
P 6250 4150
F 0 "#PWR0102" H 6250 4250 50  0001 C CNN
F 1 "-12V" H 6265 4323 50  0000 C CNN
F 2 "" H 6250 4150 50  0001 C CNN
F 3 "" H 6250 4150 50  0001 C CNN
	1    6250 4150
	-1   0    0    1   
$EndComp
$Comp
L Device:R R7
U 1 1 614B237A
P 4100 5400
F 0 "R7" V 3893 5400 50  0000 C CNN
F 1 "100***" V 3984 5400 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4030 5400 50  0001 C CNN
F 3 "~" H 4100 5400 50  0001 C CNN
	1    4100 5400
	0    1    1    0   
$EndComp
$Comp
L Connector_Generic:Conn_01x02 J5
U 1 1 614B2B83
P 3600 5500
F 0 "J5" H 3518 5175 50  0000 C CNN
F 1 "GAIN 10k" H 3518 5266 50  0000 C CNN
F 2 "Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical" H 3600 5500 50  0001 C CNN
F 3 "~" H 3600 5500 50  0001 C CNN
	1    3600 5500
	-1   0    0    1   
$EndComp
$Comp
L Device:C C5
U 1 1 614B50EB
P 4650 4050
F 0 "C5" V 4905 4050 50  0000 C CNN
F 1 "47u/50**" V 4814 4050 50  0000 C CNN
F 2 "Capacitor_THT:C_Radial_D10.0mm_H12.5mm_P5.00mm" H 4688 3900 50  0001 C CNN
F 3 "~" H 4650 4050 50  0001 C CNN
	1    4650 4050
	0    -1   -1   0   
$EndComp
$Comp
L Connector_Generic:Conn_01x03 J3
U 1 1 614B5809
P 3700 3900
F 0 "J3" H 3618 3575 50  0000 C CNN
F 1 "MIC XLR" H 3618 3666 50  0000 C CNN
F 2 "Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical" H 3700 3900 50  0001 C CNN
F 3 "~" H 3700 3900 50  0001 C CNN
	1    3700 3900
	-1   0    0    1   
$EndComp
Wire Wire Line
	4500 3650 4200 3650
Wire Wire Line
	4050 3650 4050 3800
Wire Wire Line
	4050 3800 3900 3800
Wire Wire Line
	4050 3900 3900 3900
$Comp
L power:GND #PWR0103
U 1 1 614B723F
P 3950 4750
F 0 "#PWR0103" H 3950 4500 50  0001 C CNN
F 1 "GND" H 3955 4577 50  0000 C CNN
F 2 "" H 3950 4750 50  0001 C CNN
F 3 "" H 3950 4750 50  0001 C CNN
	1    3950 4750
	1    0    0    -1  
$EndComp
Wire Wire Line
	3900 4000 3950 4000
$Comp
L Device:R R6
U 1 1 614B857C
P 4900 4400
F 0 "R6" H 4970 4446 50  0000 L CNN
F 1 "2k2" H 4970 4355 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4830 4400 50  0001 C CNN
F 3 "~" H 4900 4400 50  0001 C CNN
	1    4900 4400
	1    0    0    -1  
$EndComp
Wire Wire Line
	4900 4250 4900 3650
Connection ~ 4900 3650
Wire Wire Line
	4900 3650 4800 3650
Wire Wire Line
	4800 4250 4800 4050
Connection ~ 4800 4050
$Comp
L power:GND #PWR0104
U 1 1 614B9B70
P 4900 4750
F 0 "#PWR0104" H 4900 4500 50  0001 C CNN
F 1 "GND" H 4905 4577 50  0000 C CNN
F 2 "" H 4900 4750 50  0001 C CNN
F 3 "" H 4900 4750 50  0001 C CNN
	1    4900 4750
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0105
U 1 1 614B9FA8
P 4800 4750
F 0 "#PWR0105" H 4800 4500 50  0001 C CNN
F 1 "GND" H 4805 4577 50  0000 C CNN
F 2 "" H 4800 4750 50  0001 C CNN
F 3 "" H 4800 4750 50  0001 C CNN
	1    4800 4750
	1    0    0    -1  
$EndComp
Wire Wire Line
	3950 4000 3950 4750
Wire Wire Line
	4800 4750 4800 4550
Wire Wire Line
	4900 4550 4900 4750
$Comp
L Amplifier_Operational:TL071 U2
U 1 1 614BD005
P 7050 4800
F 0 "U2" H 7393 4754 50  0000 L CNN
F 1 "TL071" H 7393 4845 50  0000 L CNN
F 2 "Package_DIP:DIP-8_W7.62mm_Socket_LongPads" H 7100 4850 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl071.pdf" H 7200 4950 50  0001 C CNN
	1    7050 4800
	-1   0    0    1   
$EndComp
$Comp
L Device:R R2
U 1 1 614BF981
P 4200 3300
F 0 "R2" H 4130 3346 50  0000 R CNN
F 1 "6k8" H 4130 3255 50  0000 R CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4130 3300 50  0001 C CNN
F 3 "~" H 4200 3300 50  0001 C CNN
	1    4200 3300
	1    0    0    -1  
$EndComp
$Comp
L Device:R R3
U 1 1 614BFD34
P 4300 3300
F 0 "R3" H 4370 3346 50  0000 L CNN
F 1 "6k8" H 4370 3255 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4230 3300 50  0001 C CNN
F 3 "~" H 4300 3300 50  0001 C CNN
	1    4300 3300
	1    0    0    -1  
$EndComp
$Comp
L Connector_Generic:Conn_01x03 J4
U 1 1 614C2C07
P 5450 2500
F 0 "J4" H 5530 2542 50  0000 L CNN
F 1 "PHANTOM POWER SW" H 5530 2451 50  0000 L CNN
F 2 "Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical" H 5450 2500 50  0001 C CNN
F 3 "~" H 5450 2500 50  0001 C CNN
	1    5450 2500
	1    0    0    -1  
$EndComp
Wire Wire Line
	4250 2500 4250 2800
Wire Wire Line
	4250 3050 4300 3050
Wire Wire Line
	4300 3050 4300 3150
Wire Wire Line
	4250 3050 4200 3050
Wire Wire Line
	4200 3050 4200 3150
Connection ~ 4250 3050
Wire Wire Line
	4200 3450 4200 3650
Connection ~ 4200 3650
Wire Wire Line
	4200 3650 4050 3650
Wire Wire Line
	4500 4050 4300 4050
Wire Wire Line
	4050 4050 4050 3900
Wire Wire Line
	4300 3450 4300 4050
Connection ~ 4300 4050
Wire Wire Line
	4300 4050 4050 4050
$Comp
L Device:R R4
U 1 1 614C6E87
P 5250 2750
F 0 "R4" H 5320 2796 50  0000 L CNN
F 1 "47k" H 5320 2705 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 5180 2750 50  0001 C CNN
F 3 "~" H 5250 2750 50  0001 C CNN
	1    5250 2750
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0106
U 1 1 614C7EC7
P 5250 2900
F 0 "#PWR0106" H 5250 2650 50  0001 C CNN
F 1 "GND" H 5255 2727 50  0000 C CNN
F 2 "" H 5250 2900 50  0001 C CNN
F 3 "" H 5250 2900 50  0001 C CNN
	1    5250 2900
	1    0    0    -1  
$EndComp
$Comp
L Device:CP C2
U 1 1 614C96FB
P 4500 2750
F 0 "C2" H 4618 2796 50  0000 L CNN
F 1 "47u/50" H 4618 2705 50  0000 L CNN
F 2 "Capacitor_THT:CP_Radial_D6.3mm_P2.50mm" H 4538 2600 50  0001 C CNN
F 3 "~" H 4500 2750 50  0001 C CNN
	1    4500 2750
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0107
U 1 1 614CE20F
P 4500 2900
F 0 "#PWR0107" H 4500 2650 50  0001 C CNN
F 1 "GND" H 4505 2727 50  0000 C CNN
F 2 "" H 4500 2900 50  0001 C CNN
F 3 "" H 4500 2900 50  0001 C CNN
	1    4500 2900
	1    0    0    -1  
$EndComp
Wire Wire Line
	4500 2400 4500 2600
Wire Wire Line
	3900 2000 4500 2000
Wire Wire Line
	4500 2000 4500 2400
Connection ~ 4500 2400
$Comp
L power:GND #PWR0108
U 1 1 614D3BD4
P 3900 2400
F 0 "#PWR0108" H 3900 2150 50  0001 C CNN
F 1 "GND" H 3905 2227 50  0000 C CNN
F 2 "" H 3900 2400 50  0001 C CNN
F 3 "" H 3900 2400 50  0001 C CNN
	1    3900 2400
	1    0    0    -1  
$EndComp
Wire Wire Line
	3900 2100 3900 2400
$Comp
L power:GND #PWR0109
U 1 1 614D7CBF
P 7350 5100
F 0 "#PWR0109" H 7350 4850 50  0001 C CNN
F 1 "GND" H 7355 4927 50  0000 C CNN
F 2 "" H 7350 5100 50  0001 C CNN
F 3 "" H 7350 5100 50  0001 C CNN
	1    7350 5100
	1    0    0    -1  
$EndComp
Wire Wire Line
	7350 4900 7350 5100
$Comp
L power:+12V #PWR0110
U 1 1 614D8C67
P 7000 5150
F 0 "#PWR0110" H 7000 5000 50  0001 C CNN
F 1 "+12V" H 7015 5323 50  0000 C CNN
F 2 "" H 7000 5150 50  0001 C CNN
F 3 "" H 7000 5150 50  0001 C CNN
	1    7000 5150
	1    0    0    -1  
$EndComp
Wire Wire Line
	7150 5100 7150 5150
Wire Wire Line
	7150 5150 7000 5150
$Comp
L power:-12V #PWR0111
U 1 1 614DB1C2
P 7250 4250
F 0 "#PWR0111" H 7250 4350 50  0001 C CNN
F 1 "-12V" H 7265 4423 50  0000 C CNN
F 2 "" H 7250 4250 50  0001 C CNN
F 3 "" H 7250 4250 50  0001 C CNN
	1    7250 4250
	-1   0    0    1   
$EndComp
Wire Wire Line
	7250 4250 7150 4250
Wire Wire Line
	7150 4250 7150 4500
$Comp
L Device:R R8
U 1 1 614DE5A2
P 7450 4000
F 0 "R8" H 7520 4046 50  0000 L CNN
F 1 "1M" H 7520 3955 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7380 4000 50  0001 C CNN
F 3 "~" H 7450 4000 50  0001 C CNN
	1    7450 4000
	1    0    0    -1  
$EndComp
Wire Wire Line
	6650 3850 7450 3850
Wire Wire Line
	7450 4150 7450 4700
Wire Wire Line
	7450 4700 7350 4700
Wire Wire Line
	6750 4800 6350 4800
Wire Wire Line
	6350 4800 6350 4150
$Comp
L power:+12V #PWR0112
U 1 1 614E4804
P 3900 6700
F 0 "#PWR0112" H 3900 6550 50  0001 C CNN
F 1 "+12V" H 3915 6873 50  0000 C CNN
F 2 "" H 3900 6700 50  0001 C CNN
F 3 "" H 3900 6700 50  0001 C CNN
	1    3900 6700
	1    0    0    -1  
$EndComp
$Comp
L Device:C C1
U 1 1 614E54C6
P 3900 6850
F 0 "C1" H 4015 6896 50  0000 L CNN
F 1 "100n" H 4015 6805 50  0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm" H 3938 6700 50  0001 C CNN
F 3 "~" H 3900 6850 50  0001 C CNN
	1    3900 6850
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0113
U 1 1 614E7C11
P 3900 7000
F 0 "#PWR0113" H 3900 6750 50  0001 C CNN
F 1 "GND" H 3905 6827 50  0000 C CNN
F 2 "" H 3900 7000 50  0001 C CNN
F 3 "" H 3900 7000 50  0001 C CNN
	1    3900 7000
	1    0    0    -1  
$EndComp
$Comp
L power:+12V #PWR0114
U 1 1 614E96CD
P 4300 6700
F 0 "#PWR0114" H 4300 6550 50  0001 C CNN
F 1 "+12V" H 4315 6873 50  0000 C CNN
F 2 "" H 4300 6700 50  0001 C CNN
F 3 "" H 4300 6700 50  0001 C CNN
	1    4300 6700
	1    0    0    -1  
$EndComp
$Comp
L Device:C C3
U 1 1 614E96D3
P 4300 6850
F 0 "C3" H 4415 6896 50  0000 L CNN
F 1 "100n" H 4415 6805 50  0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm" H 4338 6700 50  0001 C CNN
F 3 "~" H 4300 6850 50  0001 C CNN
	1    4300 6850
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0115
U 1 1 614E96D9
P 4300 7000
F 0 "#PWR0115" H 4300 6750 50  0001 C CNN
F 1 "GND" H 4305 6827 50  0000 C CNN
F 2 "" H 4300 7000 50  0001 C CNN
F 3 "" H 4300 7000 50  0001 C CNN
	1    4300 7000
	1    0    0    -1  
$EndComp
$Comp
L power:-12V #PWR0116
U 1 1 614EB1AA
P 4700 6700
F 0 "#PWR0116" H 4700 6800 50  0001 C CNN
F 1 "-12V" H 4715 6873 50  0000 C CNN
F 2 "" H 4700 6700 50  0001 C CNN
F 3 "" H 4700 6700 50  0001 C CNN
	1    4700 6700
	1    0    0    -1  
$EndComp
$Comp
L Device:C C6
U 1 1 614EC5EC
P 4700 6850
F 0 "C6" H 4815 6896 50  0000 L CNN
F 1 "100n" H 4815 6805 50  0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm" H 4738 6700 50  0001 C CNN
F 3 "~" H 4700 6850 50  0001 C CNN
	1    4700 6850
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0117
U 1 1 614F6B50
P 4700 7000
F 0 "#PWR0117" H 4700 6750 50  0001 C CNN
F 1 "GND" H 4705 6827 50  0000 C CNN
F 2 "" H 4700 7000 50  0001 C CNN
F 3 "" H 4700 7000 50  0001 C CNN
	1    4700 7000
	1    0    0    -1  
$EndComp
$Comp
L power:-12V #PWR0118
U 1 1 614F8E7A
P 5100 6700
F 0 "#PWR0118" H 5100 6800 50  0001 C CNN
F 1 "-12V" H 5115 6873 50  0000 C CNN
F 2 "" H 5100 6700 50  0001 C CNN
F 3 "" H 5100 6700 50  0001 C CNN
	1    5100 6700
	1    0    0    -1  
$EndComp
$Comp
L Device:C C7
U 1 1 614F8E80
P 5100 6850
F 0 "C7" H 5215 6896 50  0000 L CNN
F 1 "100n" H 5215 6805 50  0000 L CNN
F 2 "Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm" H 5138 6700 50  0001 C CNN
F 3 "~" H 5100 6850 50  0001 C CNN
	1    5100 6850
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0119
U 1 1 614F8E86
P 5100 7000
F 0 "#PWR0119" H 5100 6750 50  0001 C CNN
F 1 "GND" H 5105 6827 50  0000 C CNN
F 2 "" H 5100 7000 50  0001 C CNN
F 3 "" H 5100 7000 50  0001 C CNN
	1    5100 7000
	1    0    0    -1  
$EndComp
$Comp
L Diode:1N4148 D4
U 1 1 614FD5FE
P 5500 4200
F 0 "D4" V 5454 4280 50  0000 L CNN
F 1 "1N4148" V 5545 4280 50  0000 L CNN
F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 5500 4025 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 5500 4200 50  0001 C CNN
	1    5500 4200
	0    1    1    0   
$EndComp
Connection ~ 5500 4050
$Comp
L Diode:1N4148 D2
U 1 1 6150114B
P 5300 4200
F 0 "D2" V 5254 4280 50  0000 L CNN
F 1 "1N4148" V 5345 4280 50  0000 L CNN
F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 5300 4025 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 5300 4200 50  0001 C CNN
	1    5300 4200
	0    -1   -1   0   
$EndComp
$Comp
L Diode:1N4148 D3
U 1 1 61505B58
P 5500 3500
F 0 "D3" V 5454 3580 50  0000 L CNN
F 1 "1N4148" V 5545 3580 50  0000 L CNN
F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 5500 3325 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 5500 3500 50  0001 C CNN
	1    5500 3500
	0    1    1    0   
$EndComp
$Comp
L Diode:1N4148 D1
U 1 1 61505B5E
P 5300 3500
F 0 "D1" V 5254 3580 50  0000 L CNN
F 1 "1N4148" V 5345 3580 50  0000 L CNN
F 2 "Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal" H 5300 3325 50  0001 C CNN
F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 5300 3500 50  0001 C CNN
	1    5300 3500
	0    -1   -1   0   
$EndComp
Connection ~ 5500 3650
Wire Wire Line
	4800 4050 5300 4050
$Comp
L power:-12V #PWR0120
U 1 1 6151E312
P 5500 4350
F 0 "#PWR0120" H 5500 4450 50  0001 C CNN
F 1 "-12V" H 5515 4523 50  0000 C CNN
F 2 "" H 5500 4350 50  0001 C CNN
F 3 "" H 5500 4350 50  0001 C CNN
	1    5500 4350
	-1   0    0    1   
$EndComp
$Comp
L power:+12V #PWR0121
U 1 1 615204F6
P 5300 4350
F 0 "#PWR0121" H 5300 4200 50  0001 C CNN
F 1 "+12V" H 5315 4523 50  0000 C CNN
F 2 "" H 5300 4350 50  0001 C CNN
F 3 "" H 5300 4350 50  0001 C CNN
	1    5300 4350
	-1   0    0    1   
$EndComp
$Comp
L power:+12V #PWR0122
U 1 1 61521685
P 5500 3350
F 0 "#PWR0122" H 5500 3200 50  0001 C CNN
F 1 "+12V" H 5515 3523 50  0000 C CNN
F 2 "" H 5500 3350 50  0001 C CNN
F 3 "" H 5500 3350 50  0001 C CNN
	1    5500 3350
	1    0    0    -1  
$EndComp
$Comp
L power:-12V #PWR0123
U 1 1 61524141
P 5300 3350
F 0 "#PWR0123" H 5300 3450 50  0001 C CNN
F 1 "-12V" H 5315 3523 50  0000 C CNN
F 2 "" H 5300 3350 50  0001 C CNN
F 3 "" H 5300 3350 50  0001 C CNN
	1    5300 3350
	1    0    0    -1  
$EndComp
$Comp
L Device:C C8
U 1 1 61528535
P 6900 4150
F 0 "C8" V 7060 4150 50  0000 C CNN
F 1 "100n" V 7151 4150 50  0000 C CNN
F 2 "Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm" H 6938 4000 50  0001 C CNN
F 3 "~" H 6900 4150 50  0001 C CNN
	1    6900 4150
	0    1    1    0   
$EndComp
Wire Wire Line
	7050 4150 7450 4150
Connection ~ 7450 4150
Wire Wire Line
	6750 4150 6350 4150
Connection ~ 6350 4150
$Comp
L Device:R R9
U 1 1 61533C16
P 7850 3850
F 0 "R9" V 8057 3850 50  0000 C CNN
F 1 "1k" V 7966 3850 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 7780 3850 50  0001 C CNN
F 3 "~" H 7850 3850 50  0001 C CNN
	1    7850 3850
	0    -1   -1   0   
$EndComp
$Comp
L Connector_Generic:Conn_01x02 J6
U 1 1 61536687
P 8500 3950
F 0 "J6" H 8418 3625 50  0000 C CNN
F 1 "OUT" H 8418 3716 50  0000 C CNN
F 2 "Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical" H 8500 3950 50  0001 C CNN
F 3 "~" H 8500 3950 50  0001 C CNN
	1    8500 3950
	1    0    0    1   
$EndComp
$Comp
L power:GND #PWR0124
U 1 1 61543277
P 8150 4800
F 0 "#PWR0124" H 8150 4550 50  0001 C CNN
F 1 "GND" H 8155 4627 50  0000 C CNN
F 2 "" H 8150 4800 50  0001 C CNN
F 3 "" H 8150 4800 50  0001 C CNN
	1    8150 4800
	1    0    0    -1  
$EndComp
Wire Wire Line
	8300 3850 8000 3850
Wire Wire Line
	7700 3850 7450 3850
Connection ~ 7450 3850
Wire Wire Line
	8300 3950 8150 3950
Wire Wire Line
	8150 3950 8150 4800
$Comp
L Connector_Generic:Conn_01x02 J1
U 1 1 6154DF66
P 3400 2900
F 0 "J1" H 3318 2575 50  0000 C CNN
F 1 "LED" H 3318 2666 50  0000 C CNN
F 2 "Connector_Molex:Molex_KK-254_AE-6410-02A_1x02_P2.54mm_Vertical" H 3400 2900 50  0001 C CNN
F 3 "~" H 3400 2900 50  0001 C CNN
	1    3400 2900
	-1   0    0    1   
$EndComp
$Comp
L Device:R R1
U 1 1 61551003
P 3900 2800
F 0 "R1" V 3785 2800 50  0000 C CNN
F 1 "10k*" V 3694 2800 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 3830 2800 50  0001 C CNN
F 3 "~" H 3900 2800 50  0001 C CNN
	1    3900 2800
	0    -1   -1   0   
$EndComp
$Comp
L power:GND #PWR0125
U 1 1 6155351D
P 3600 3200
F 0 "#PWR0125" H 3600 2950 50  0001 C CNN
F 1 "GND" H 3605 3027 50  0000 C CNN
F 2 "" H 3600 3200 50  0001 C CNN
F 3 "" H 3600 3200 50  0001 C CNN
	1    3600 3200
	1    0    0    -1  
$EndComp
Wire Wire Line
	3600 2900 3600 3200
Wire Wire Line
	4050 2800 4250 2800
Connection ~ 4250 2800
Wire Wire Line
	4250 2800 4250 3050
Wire Wire Line
	3750 2800 3600 2800
$Comp
L Connector_Generic:Conn_02x05_Odd_Even J7
U 1 1 61561D9A
P 2050 6850
F 0 "J7" H 2100 7267 50  0000 C CNN
F 1 "POWER" H 2100 7176 50  0000 C CNN
F 2 "Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical" H 2050 6850 50  0001 C CNN
F 3 "~" H 2050 6850 50  0001 C CNN
	1    2050 6850
	1    0    0    -1  
$EndComp
$Comp
L Device:R R10
U 1 1 615678C7
P 2500 6650
F 0 "R10" V 2293 6650 50  0000 C CNN
F 1 "10" V 2384 6650 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 2430 6650 50  0001 C CNN
F 3 "~" H 2500 6650 50  0001 C CNN
	1    2500 6650
	0    1    1    0   
$EndComp
$Comp
L Device:R R11
U 1 1 61568EE2
P 2500 7050
F 0 "R11" V 2293 7050 50  0000 C CNN
F 1 "10" V 2384 7050 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 2430 7050 50  0001 C CNN
F 3 "~" H 2500 7050 50  0001 C CNN
	1    2500 7050
	0    1    1    0   
$EndComp
Wire Wire Line
	1850 6650 2350 6650
Connection ~ 2350 6650
Wire Wire Line
	2350 6750 1850 6750
Wire Wire Line
	1850 6850 2350 6850
Wire Wire Line
	2350 6950 1850 6950
Wire Wire Line
	1850 7050 2350 7050
Connection ~ 2350 7050
Wire Wire Line
	1850 6750 1850 6850
Connection ~ 1850 6750
Connection ~ 1850 6850
Wire Wire Line
	1850 6850 1850 6950
Connection ~ 1850 6950
$Comp
L Device:CP C10
U 1 1 61574468
P 2800 7200
F 0 "C10" H 2918 7246 50  0000 L CNN
F 1 "10u" H 2918 7155 50  0000 L CNN
F 2 "Capacitor_THT:CP_Radial_D5.0mm_P2.50mm" H 2838 7050 50  0001 C CNN
F 3 "~" H 2800 7200 50  0001 C CNN
	1    2800 7200
	1    0    0    -1  
$EndComp
$Comp
L power:+12V #PWR0126
U 1 1 61577B06
P 3150 7050
F 0 "#PWR0126" H 3150 6900 50  0001 C CNN
F 1 "+12V" H 3165 7223 50  0000 C CNN
F 2 "" H 3150 7050 50  0001 C CNN
F 3 "" H 3150 7050 50  0001 C CNN
	1    3150 7050
	1    0    0    -1  
$EndComp
Wire Wire Line
	2650 7050 2800 7050
Wire Wire Line
	2800 7050 3150 7050
Connection ~ 2800 7050
$Comp
L power:GND #PWR0127
U 1 1 6157DA18
P 2800 7350
F 0 "#PWR0127" H 2800 7100 50  0001 C CNN
F 1 "GND" H 2805 7177 50  0000 C CNN
F 2 "" H 2800 7350 50  0001 C CNN
F 3 "" H 2800 7350 50  0001 C CNN
	1    2800 7350
	1    0    0    -1  
$EndComp
$Comp
L Device:CP C9
U 1 1 6158311C
P 2800 6500
F 0 "C9" H 2918 6546 50  0000 L CNN
F 1 "10u" H 2918 6455 50  0000 L CNN
F 2 "Capacitor_THT:CP_Radial_D5.0mm_P2.50mm" H 2838 6350 50  0001 C CNN
F 3 "~" H 2800 6500 50  0001 C CNN
	1    2800 6500
	1    0    0    -1  
$EndComp
$Comp
L power:-12V #PWR0128
U 1 1 61593D23
P 3150 6650
F 0 "#PWR0128" H 3150 6750 50  0001 C CNN
F 1 "-12V" H 3165 6823 50  0000 C CNN
F 2 "" H 3150 6650 50  0001 C CNN
F 3 "" H 3150 6650 50  0001 C CNN
	1    3150 6650
	-1   0    0    1   
$EndComp
Wire Wire Line
	2650 6650 2800 6650
Wire Wire Line
	2800 6650 3150 6650
Connection ~ 2800 6650
$Comp
L power:GND #PWR0129
U 1 1 6159A440
P 3100 6250
F 0 "#PWR0129" H 3100 6000 50  0001 C CNN
F 1 "GND" H 3105 6077 50  0000 C CNN
F 2 "" H 3100 6250 50  0001 C CNN
F 3 "" H 3100 6250 50  0001 C CNN
	1    3100 6250
	1    0    0    -1  
$EndComp
Wire Wire Line
	2800 6350 2800 6250
Wire Wire Line
	2800 6250 3100 6250
$Comp
L Connector_Generic:Conn_01x03 J2
U 1 1 615A85FB
P 3700 2000
F 0 "J2" H 3618 1675 50  0000 C CNN
F 1 "PHANTOM POWER" H 3618 1766 50  0000 C CNN
F 2 "Connector_Molex:Molex_KK-254_AE-6410-03A_1x03_P2.54mm_Vertical" H 3700 2000 50  0001 C CNN
F 3 "~" H 3700 2000 50  0001 C CNN
	1    3700 2000
	-1   0    0    1   
$EndComp
$Comp
L power:+12V #PWR0130
U 1 1 615AFD7A
P 4500 1650
F 0 "#PWR0130" H 4500 1500 50  0001 C CNN
F 1 "+12V" H 4515 1823 50  0000 C CNN
F 2 "" H 4500 1650 50  0001 C CNN
F 3 "" H 4500 1650 50  0001 C CNN
	1    4500 1650
	1    0    0    -1  
$EndComp
Wire Wire Line
	3900 1900 4500 1900
Wire Wire Line
	4500 1900 4500 1650
$Comp
L power:GND #PWR0131
U 1 1 6161011D
P 1650 7300
F 0 "#PWR0131" H 1650 7050 50  0001 C CNN
F 1 "GND" H 1655 7127 50  0000 C CNN
F 2 "" H 1650 7300 50  0001 C CNN
F 3 "" H 1650 7300 50  0001 C CNN
	1    1650 7300
	1    0    0    -1  
$EndComp
Wire Wire Line
	1850 6850 1650 6850
Wire Wire Line
	1650 6850 1650 7300
$Comp
L Device:C C4
U 1 1 614B3F75
P 4650 3650
F 0 "C4" V 4905 3650 50  0000 C CNN
F 1 "47u/50**" V 4814 3650 50  0000 C CNN
F 2 "Capacitor_THT:C_Radial_D10.0mm_H12.5mm_P5.00mm" H 4688 3500 50  0001 C CNN
F 3 "~" H 4650 3650 50  0001 C CNN
	1    4650 3650
	0    -1   -1   0   
$EndComp
Text Notes 6550 3050 0    50   ~ 0
* change value according to phantom power in, 10k is for 48V\n** use bipolar caps\n*** adjust to change max gain
Wire Wire Line
	4500 2400 5250 2400
Wire Wire Line
	4250 2500 5250 2500
Wire Wire Line
	5500 3650 5950 3650
Wire Wire Line
	5500 4050 5950 4050
Text GLabel 5950 3750 0    50   Input ~ 0
GAIN1
Text GLabel 4400 5400 2    50   Input ~ 0
GAIN1
Text GLabel 5950 3950 0    50   Input ~ 0
GAIN2
Text GLabel 4400 5500 2    50   Input ~ 0
GAIN2
Wire Wire Line
	4400 5400 4250 5400
Wire Wire Line
	3950 5400 3800 5400
Wire Wire Line
	3800 5500 4400 5500
$Comp
L Device:R R5
U 1 1 614B8114
P 4800 4400
F 0 "R5" H 4730 4446 50  0000 R CNN
F 1 "2k2" H 4730 4355 50  0000 R CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4730 4400 50  0001 C CNN
F 3 "~" H 4800 4400 50  0001 C CNN
	1    4800 4400
	1    0    0    -1  
$EndComp
Connection ~ 5300 3650
Wire Wire Line
	5300 3650 5500 3650
Wire Wire Line
	4900 3650 5300 3650
Connection ~ 5300 4050
Wire Wire Line
	5300 4050 5500 4050
$EndSCHEMATC