pcb.sch

EESchema Schematic File Version 4
LIBS:pcb-cache
EELAYER 29 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 1 1
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Device:Microphone_Condenser MK1
U 1 1 5D3ED354
P 1700 5500
F 0 "MK1" H 1400 5550 50  0000 L CNN
F 1 "Microphone_Condenser" H 700 5450 50  0000 L CNN
F 2 "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical" V 1700 5600 50  0001 C CNN
F 3 "~" V 1700 5600 50  0001 C CNN
	1    1700 5500
	1    0    0    -1  
$EndComp
$Comp
L Device:R R1
U 1 1 5D3F127C
P 1700 5000
F 0 "R1" H 1770 5046 50  0000 L CNN
F 1 "10k" H 1770 4955 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 1630 5000 50  0001 C CNN
F 3 "~" H 1700 5000 50  0001 C CNN
	1    1700 5000
	1    0    0    -1  
$EndComp
$Comp
L Device:C C1
U 1 1 5D3F299E
P 2050 5300
F 0 "C1" V 1798 5300 50  0000 C CNN
F 1 "1uF" V 1889 5300 50  0000 C CNN
F 2 "Capacitor_THT:C_Disc_D5.1mm_W3.2mm_P5.00mm" H 2088 5150 50  0001 C CNN
F 3 "~" H 2050 5300 50  0001 C CNN
	1    2050 5300
	0    1    1    0   
$EndComp
$Comp
L Device:C C2
U 1 1 5D3F3446
P 5000 5300
F 0 "C2" H 5115 5346 50  0000 L CNN
F 1 "0.1uF" H 5115 5255 50  0000 L CNN
F 2 "Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm" H 5038 5150 50  0001 C CNN
F 3 "~" H 5000 5300 50  0001 C CNN
	1    5000 5300
	1    0    0    -1  
$EndComp
Text GLabel 1700 4850 1    50   Input ~ 0
S-VIN
Text GLabel 1700 5700 3    50   Input ~ 0
S-GND
Wire Wire Line
	1700 5150 1700 5300
Wire Wire Line
	1900 5300 1700 5300
Connection ~ 1700 5300
$Comp
L Device:Battery_Cell BT1
U 1 1 5D3F50C3
P 1450 1300
F 0 "BT1" H 1750 1350 50  0000 R CNN
F 1 "4.2V LiPo Cell" H 2150 1450 50  0000 R CNN
F 2 "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical" V 1450 1360 50  0001 C CNN
F 3 "~" V 1450 1360 50  0001 C CNN
	1    1450 1300
	0    -1   -1   0   
$EndComp
$Comp
L Transistor_FET:BSS138 Q1
U 1 1 5D3EE254
P 4450 3750
F 0 "Q1" H 4656 3796 50  0000 L CNN
F 1 "BSS138" H 4656 3705 50  0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 4650 3675 50  0001 L CIN
F 3 "https://www.fairchildsemi.com/datasheets/BS/BSS138.pdf" H 4450 3750 50  0001 L CNN
	1    4450 3750
	-1   0    0    1   
$EndComp
Text GLabel 4350 3950 3    50   Input ~ 0
S-GND
Text GLabel 4350 3550 1    50   Input ~ 0
GND
Text GLabel 5000 5150 1    50   Input ~ 0
S-VIN
Text GLabel 5000 5450 3    50   Input ~ 0
S-GND
Text GLabel 2200 5300 2    50   Input ~ 0
MIC_RAW
Text GLabel 1200 1300 1    50   Input ~ 0
VIN
Wire Wire Line
	1550 1300 1650 1300
Wire Wire Line
	1250 1300 1150 1300
Text GLabel 4650 3750 2    50   Input ~ 0
MIC_SWITCH
$Comp
L Device:R R5
U 1 1 5D487AD7
P 3900 6050
F 0 "R5" V 4100 6050 50  0000 C CNN
F 1 "220k" V 4000 6050 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 3830 6050 50  0001 C CNN
F 3 "~" H 3900 6050 50  0001 C CNN
	1    3900 6050
	0    1    1    0   
$EndComp
Text GLabel 4200 5300 2    50   Input ~ 0
MIC_SIGNAL
Text GLabel 3800 5600 3    50   Input ~ 0
S-GND
Text GLabel 3800 5000 1    50   Input ~ 0
S-VIN
NoConn ~ 3900 5600
NoConn ~ 4000 5600
$Comp
L pycom:LoPy4 U1
U 1 1 5D3EDF55
P 1000 1550
F 0 "U1" H 1825 -887 60  0000 C CNN
F 1 "LoPy4" H 1825 -781 60  0000 C CNN
F 2 "pycom:LoPy_with_headers" H 1000 1550 60  0001 C CNN
F 3 "" H 1000 1550 60  0001 C CNN
	1    1000 1550
	1    0    0    -1  
$EndComp
Text GLabel 2650 2650 2    50   Input ~ 0
MIC_SWITCH
Text GLabel 2650 3250 2    50   Input ~ 0
MIC_SIGNAL
Text GLabel 2650 1750 2    50   Input ~ 0
VIN
Text GLabel 2650 1900 2    50   Input ~ 0
GND
Text GLabel 2650 2050 2    50   Input ~ 0
S-VIN
NoConn ~ 2650 3700
NoConn ~ 2650 3550
NoConn ~ 2650 2950
NoConn ~ 2650 2800
NoConn ~ 2650 2200
NoConn ~ 1000 1750
NoConn ~ 1000 1900
NoConn ~ 1000 2050
NoConn ~ 1000 2200
NoConn ~ 1000 2350
NoConn ~ 1000 2500
NoConn ~ 1000 2650
NoConn ~ 1000 2800
NoConn ~ 1000 2950
NoConn ~ 1000 3100
NoConn ~ 1000 3250
NoConn ~ 1000 3400
NoConn ~ 1000 3550
NoConn ~ 1000 3700
$Comp
L Device:R R4
U 1 1 5D486D70
P 3450 5550
F 0 "R4" V 3350 5550 50  0000 C CNN
F 1 "1k" V 3250 5550 50  0000 C CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 3380 5550 50  0001 C CNN
F 3 "~" H 3450 5550 50  0001 C CNN
	1    3450 5550
	1    0    0    -1  
$EndComp
Text GLabel 3450 5700 3    50   Input ~ 0
MIC_RAW
$Comp
L Amplifier_Operational:TL071 U2
U 1 1 5D485070
P 3900 5300
F 0 "U2" H 4000 5550 50  0000 L CNN
F 1 "TL071" H 4000 5450 50  0000 L CNN
F 2 "Package_DIP:DIP-8_W7.62mm" H 3950 5350 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl071.pdf" H 4050 5450 50  0001 C CNN
	1    3900 5300
	1    0    0    -1  
$EndComp
Wire Wire Line
	3600 6050 3600 5400
Wire Wire Line
	4200 5300 4200 6050
Wire Wire Line
	3450 5400 3600 5400
Connection ~ 3600 5400
Wire Wire Line
	3600 6050 3750 6050
Wire Wire Line
	4050 6050 4200 6050
Connection ~ 3050 5200
Wire Wire Line
	3600 5200 3050 5200
Text GLabel 3050 5500 3    50   Input ~ 0
S-GND
$Comp
L Device:R R3
U 1 1 5D4934CB
P 3050 5350
F 0 "R3" H 3200 5300 50  0000 R CNN
F 1 "220k" H 3300 5400 50  0000 R CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 2980 5350 50  0001 C CNN
F 3 "~" H 3050 5350 50  0001 C CNN
	1    3050 5350
	-1   0    0    1   
$EndComp
Text GLabel 3050 4900 1    50   Input ~ 0
S-VIN
Text GLabel 2650 3100 2    50   Input ~ 0
BAT_SIGNAL
$Comp
L Device:R R2
U 1 1 5D4920B6
P 3050 5050
F 0 "R2" H 3200 5000 50  0000 R CNN
F 1 "220k" H 3300 5100 50  0000 R CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 2980 5050 50  0001 C CNN
F 3 "~" H 3050 5050 50  0001 C CNN
	1    3050 5050
	-1   0    0    1   
$EndComp
$Comp
L Device:R R7
U 1 1 5D4C2CB7
P 4350 2350
F 0 "R7" H 4500 2300 50  0000 R CNN
F 1 "220k" H 4600 2400 50  0000 R CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 4280 2350 50  0001 C CNN
F 3 "~" H 4350 2350 50  0001 C CNN
	1    4350 2350
	-1   0    0    1   
$EndComp
$Comp
L Device:R R8
U 1 1 5D4C2F72
P 4350 2650
F 0 "R8" H 4500 2600 50  0000 R CNN
F 1 "220k" H 4600 2700 50  0000 R CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 4280 2650 50  0001 C CNN
F 3 "~" H 4350 2650 50  0001 C CNN
	1    4350 2650
	-1   0    0    1   
$EndComp
Text GLabel 4350 2500 2    50   Input ~ 0
BAT_SIGNAL
Text GLabel 4350 2200 1    50   Input ~ 0
VIN
$Comp
L Connector_Generic:Conn_01x02 J1
U 1 1 5D4C53F5
P 4000 1350
F 0 "J1" V 3964 1162 50  0000 R CNN
F 1 "Conn_01x02" V 3873 1162 50  0000 R CNN
F 2 "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical" H 4000 1350 50  0001 C CNN
F 3 "~" H 4000 1350 50  0001 C CNN
	1    4000 1350
	-1   0    0    1   
$EndComp
Text GLabel 2650 2500 2    50   Input ~ 0
DEBUG_SWITCH
NoConn ~ 2650 2350
Text GLabel 4200 1350 2    50   Input ~ 0
DEBUG_SWITCH
Text GLabel 4350 2800 3    50   Input ~ 0
S-GND
NoConn ~ 2650 3400
$Comp
L power:PWR_FLAG #FLG03
U 1 1 5D489E43
P 2400 1300
F 0 "#FLG03" H 2400 1375 50  0001 C CNN
F 1 "PWR_FLAG" H 2400 1473 50  0000 C CNN
F 2 "" H 2400 1300 50  0001 C CNN
F 3 "~" H 2400 1300 50  0001 C CNN
	1    2400 1300
	0    1    1    0   
$EndComp
Text GLabel 1600 1300 1    50   Input ~ 0
GND
$Comp
L power:PWR_FLAG #FLG02
U 1 1 5D439F74
P 1650 1300
F 0 "#FLG02" H 1650 1375 50  0001 C CNN
F 1 "PWR_FLAG" H 1650 1473 50  0000 C CNN
F 2 "" H 1650 1300 50  0001 C CNN
F 3 "~" H 1650 1300 50  0001 C CNN
	1    1650 1300
	0    1    1    0   
$EndComp
$Comp
L power:PWR_FLAG #FLG01
U 1 1 5D430286
P 1150 1300
F 0 "#FLG01" H 1150 1375 50  0001 C CNN
F 1 "PWR_FLAG" H 1150 1473 50  0000 C CNN
F 2 "" H 1150 1300 50  0001 C CNN
F 3 "~" H 1150 1300 50  0001 C CNN
	1    1150 1300
	0    -1   -1   0   
$EndComp
Text GLabel 2400 1300 0    50   Input ~ 0
S-GND
Text GLabel 4200 1250 2    50   Input ~ 0
S-VIN
Text GLabel 4500 1500 2    50   Input ~ 0
GND
$Comp
L Device:R R6
U 1 1 5D48DC2E
P 4350 1500
F 0 "R6" H 4500 1450 50  0000 R CNN
F 1 "220k" H 4600 1550 50  0000 R CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" V 4280 1500 50  0001 C CNN
F 3 "~" H 4350 1500 50  0001 C CNN
	1    4350 1500
	0    1    1    0   
$EndComp
Wire Wire Line
	4200 1350 4200 1500
$Comp
L Connector_Generic:Conn_01x01 J2
U 1 1 5D6EB42A
P 6600 3100
F 0 "J2" H 6518 2875 50  0000 C CNN
F 1 "Conn_01x01" H 6518 2966 50  0000 C CNN
F 2 "MountingHole:MountingHole_2.2mm_M2_Pad" H 6600 3100 50  0001 C CNN
F 3 "~" H 6600 3100 50  0001 C CNN
	1    6600 3100
	-1   0    0    1   
$EndComp
$Comp
L Connector_Generic:Conn_01x01 J3
U 1 1 5D6EC08A
P 6600 3350
F 0 "J3" H 6518 3125 50  0000 C CNN
F 1 "Conn_01x01" H 6518 3216 50  0000 C CNN
F 2 "MountingHole:MountingHole_2.2mm_M2_Pad" H 6600 3350 50  0001 C CNN
F 3 "~" H 6600 3350 50  0001 C CNN
	1    6600 3350
	-1   0    0    1   
$EndComp
$Comp
L Connector_Generic:Conn_01x01 J4
U 1 1 5D6EC5A6
P 6600 3600
F 0 "J4" H 6518 3375 50  0000 C CNN
F 1 "Conn_01x01" H 6518 3466 50  0000 C CNN
F 2 "MountingHole:MountingHole_2.2mm_M2_Pad" H 6600 3600 50  0001 C CNN
F 3 "~" H 6600 3600 50  0001 C CNN
	1    6600 3600
	-1   0    0    1   
$EndComp
$Comp
L Connector_Generic:Conn_01x01 J5
U 1 1 5D6EC9F0
P 6600 3850
F 0 "J5" H 6518 3625 50  0000 C CNN
F 1 "Conn_01x01" H 6518 3716 50  0000 C CNN
F 2 "MountingHole:MountingHole_2.2mm_M2_Pad" H 6600 3850 50  0001 C CNN
F 3 "~" H 6600 3850 50  0001 C CNN
	1    6600 3850
	-1   0    0    1   
$EndComp
NoConn ~ 6800 3100
NoConn ~ 6800 3350
NoConn ~ 6800 3600
NoConn ~ 6800 3850
$EndSCHEMATC