EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 2 7
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Regulator_Switching:AP6503 U1
U 1 1 5FB779BE
P 5150 3300
F 0 "U1" H 5150 3967 50  0000 C CNN
F 1 "AP6503" H 5150 3876 50  0000 C CNN
F 2 "Package_SO:Diodes_SO-8EP" H 5800 2750 50  0001 C CNN
F 3 "https://www.diodes.com/assets/Datasheets/AP6503.pdf" H 5150 3450 50  0001 C CNN
	1    5150 3300
	1    0    0    -1  
$EndComp
$Comp
L Connector:Barrel_Jack_Switch J5
U 1 1 5FAF272C
P 1700 1700
F 0 "J5" H 1757 2017 50  0000 C CNN
F 1 "Barrel_Jack_Switch" H 1757 1926 50  0000 C CNN
F 2 "Connector_BarrelJack:BarrelJack_Horizontal" H 1750 1660 50  0001 C CNN
F 3 "~" H 1750 1660 50  0001 C CNN
	1    1700 1700
	1    0    0    -1  
$EndComp
NoConn ~ 2000 1700
$Comp
L Device:Fuse F1
U 1 1 5FAF53DA
P 2250 1600
F 0 "F1" V 2053 1600 50  0000 C CNN
F 1 "4A" V 2144 1600 50  0000 C CNN
F 2 "" V 2180 1600 50  0001 C CNN
F 3 "~" H 2250 1600 50  0001 C CNN
F 4 "Littlefuse 154004" V 2250 1600 50  0001 C CNN "Part Name"
	1    2250 1600
	0    1    1    0   
$EndComp
Wire Wire Line
	2100 1600 2000 1600
$Comp
L Device:CP C1
U 1 1 5FAF6729
P 2500 1850
F 0 "C1" H 2618 1896 50  0000 L CNN
F 1 "100uF/35V" H 2618 1805 50  0000 L CNN
F 2 "Capacitor_SMD:CP_Elec_8x10" H 2538 1700 50  0001 C CNN
F 3 "~" H 2500 1850 50  0001 C CNN
F 4 "Nichicon UCD1V101MNL1GS" H 2500 1850 50  0001 C CNN "Part Name"
	1    2500 1850
	1    0    0    -1  
$EndComp
$Comp
L Device:L L1
U 1 1 5FAF6D06
P 3350 1600
F 0 "L1" V 3169 1600 50  0000 C CNN
F 1 "1uH" V 3260 1600 50  0000 C CNN
F 2 "Inductor_SMD:L_Taiyo-Yuden_NR-60xx" H 3350 1600 50  0001 C CNN
F 3 "~" H 3350 1600 50  0001 C CNN
F 4 "Yaiyo Yuden NR6045T1R0N" V 3350 1600 50  0001 C CNN "Part Name"
	1    3350 1600
	0    1    1    0   
$EndComp
$Comp
L Device:CP C3
U 1 1 5FAF80B5
P 3600 1850
F 0 "C3" H 3718 1896 50  0000 L CNN
F 1 "100uF/35V" H 3718 1805 50  0000 L CNN
F 2 "Capacitor_SMD:CP_Elec_8x10" H 3638 1700 50  0001 C CNN
F 3 "~" H 3600 1850 50  0001 C CNN
	1    3600 1850
	1    0    0    -1  
$EndComp
Wire Wire Line
	2400 1600 2500 1600
Wire Wire Line
	2500 1700 2500 1600
Connection ~ 2500 1600
Wire Wire Line
	2500 1600 3100 1600
Wire Wire Line
	3600 1700 3600 1600
Wire Wire Line
	3600 1600 3500 1600
$Comp
L power:GND #PWR0108
U 1 1 5FAFA512
P 2100 1900
F 0 "#PWR0108" H 2100 1650 50  0001 C CNN
F 1 "GND" H 2105 1727 50  0000 C CNN
F 2 "" H 2100 1900 50  0001 C CNN
F 3 "" H 2100 1900 50  0001 C CNN
	1    2100 1900
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0109
U 1 1 5FAFA758
P 2500 2100
F 0 "#PWR0109" H 2500 1850 50  0001 C CNN
F 1 "GND" H 2505 1927 50  0000 C CNN
F 2 "" H 2500 2100 50  0001 C CNN
F 3 "" H 2500 2100 50  0001 C CNN
	1    2500 2100
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0110
U 1 1 5FAFA9DD
P 3600 2100
F 0 "#PWR0110" H 3600 1850 50  0001 C CNN
F 1 "GND" H 3605 1927 50  0000 C CNN
F 2 "" H 3600 2100 50  0001 C CNN
F 3 "" H 3600 2100 50  0001 C CNN
	1    3600 2100
	1    0    0    -1  
$EndComp
Wire Wire Line
	2000 1800 2100 1800
Wire Wire Line
	2100 1800 2100 1900
Wire Wire Line
	2500 2000 2500 2100
Wire Wire Line
	3600 2000 3600 2100
Text HLabel 3700 1600 2    50   Input ~ 0
19V_ANALOG
Wire Wire Line
	3700 1600 3600 1600
Connection ~ 3600 1600
$Comp
L Device:C C2
U 1 1 5FAFBD06
P 3100 3150
F 0 "C2" H 3215 3196 50  0000 L CNN
F 1 "10uF/50V" H 3215 3105 50  0000 L CNN
F 2 "Capacitor_SMD:C_1206_3216Metric" H 3138 3000 50  0001 C CNN
F 3 "~" H 3100 3150 50  0001 C CNN
F 4 "Taiyo Yuden UMK316BBJ106ML-T" H 3100 3150 50  0001 C CNN "Part Name"
	1    3100 3150
	1    0    0    -1  
$EndComp
$Comp
L Device:C C4
U 1 1 5FAFC192
P 3700 3150
F 0 "C4" H 3815 3196 50  0000 L CNN
F 1 "10uF/50V" H 3815 3105 50  0000 L CNN
F 2 "Capacitor_SMD:C_1206_3216Metric" H 3738 3000 50  0001 C CNN
F 3 "~" H 3700 3150 50  0001 C CNN
F 4 "Taiyo Yuden UMK316BBJ106ML-T" H 3700 3150 50  0001 C CNN "Part Name"
	1    3700 3150
	1    0    0    -1  
$EndComp
$Comp
L Device:R R11
U 1 1 5FAFD94B
P 4500 3200
F 0 "R11" V 4707 3200 50  0000 C CNN
F 1 "100k" V 4616 3200 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4430 3200 50  0001 C CNN
F 3 "~" H 4500 3200 50  0001 C CNN
	1    4500 3200
	0    1    -1   0   
$EndComp
$Comp
L Device:C C5
U 1 1 5FAFE05E
P 4600 3750
F 0 "C5" H 4715 3796 50  0000 L CNN
F 1 "0.1uF" H 4715 3705 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 4638 3600 50  0001 C CNN
F 3 "~" H 4600 3750 50  0001 C CNN
	1    4600 3750
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0111
U 1 1 5FAFF7E8
P 4600 4000
F 0 "#PWR0111" H 4600 3750 50  0001 C CNN
F 1 "GND" H 4605 3827 50  0000 C CNN
F 2 "" H 4600 4000 50  0001 C CNN
F 3 "" H 4600 4000 50  0001 C CNN
	1    4600 4000
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0112
U 1 1 5FAFFABC
P 5150 4100
F 0 "#PWR0112" H 5150 3850 50  0001 C CNN
F 1 "GND" H 5155 3927 50  0000 C CNN
F 2 "" H 5150 4100 50  0001 C CNN
F 3 "" H 5150 4100 50  0001 C CNN
	1    5150 4100
	1    0    0    -1  
$EndComp
Wire Wire Line
	4600 3600 4600 3500
Wire Wire Line
	4600 3500 4850 3500
Wire Wire Line
	4600 3900 4600 4000
Wire Wire Line
	5050 3900 5050 4000
Wire Wire Line
	5050 4000 5150 4000
Wire Wire Line
	5250 4000 5250 3900
Wire Wire Line
	5150 4100 5150 4000
Connection ~ 5150 4000
Wire Wire Line
	5150 4000 5250 4000
Wire Wire Line
	4850 3100 4750 3100
Wire Wire Line
	4750 3100 4750 3200
Wire Wire Line
	4750 3200 4650 3200
Wire Wire Line
	4850 2900 4250 2900
Wire Wire Line
	4250 2900 4250 3200
Wire Wire Line
	4250 3200 4350 3200
Wire Wire Line
	4250 2900 3700 2900
Wire Wire Line
	3100 2900 3100 3000
Connection ~ 4250 2900
Wire Wire Line
	3100 2900 3100 1600
Connection ~ 3100 1600
Wire Wire Line
	3100 1600 3200 1600
Wire Wire Line
	3700 2900 3700 3000
Connection ~ 3700 2900
Wire Wire Line
	3700 2900 3100 2900
$Comp
L power:GND #PWR0113
U 1 1 5FB13FF7
P 3100 3400
F 0 "#PWR0113" H 3100 3150 50  0001 C CNN
F 1 "GND" H 3105 3227 50  0000 C CNN
F 2 "" H 3100 3400 50  0001 C CNN
F 3 "" H 3100 3400 50  0001 C CNN
	1    3100 3400
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0114
U 1 1 5FB1430D
P 3700 3400
F 0 "#PWR0114" H 3700 3150 50  0001 C CNN
F 1 "GND" H 3705 3227 50  0000 C CNN
F 2 "" H 3700 3400 50  0001 C CNN
F 3 "" H 3700 3400 50  0001 C CNN
	1    3700 3400
	1    0    0    -1  
$EndComp
Wire Wire Line
	3100 3400 3100 3300
Wire Wire Line
	3700 3400 3700 3300
$Comp
L Device:C C7
U 1 1 5FB15B6A
P 5700 2900
F 0 "C7" V 5448 2900 50  0000 C CNN
F 1 "0.1uF" V 5539 2900 50  0000 C CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 5738 2750 50  0001 C CNN
F 3 "~" H 5700 2900 50  0001 C CNN
	1    5700 2900
	0    1    1    0   
$EndComp
Wire Wire Line
	5450 3100 5950 3100
Wire Wire Line
	5950 3100 5950 2900
Wire Wire Line
	5950 2900 5850 2900
Wire Wire Line
	5550 2900 5450 2900
$Comp
L Device:L L2
U 1 1 5FB174E8
P 6200 2800
F 0 "L2" V 6019 2800 50  0000 C CNN
F 1 "10uH" V 6110 2800 50  0000 C CNN
F 2 "Inductor_SMD:L_Bourns-SRN8040_8x8.15mm" H 6200 2800 50  0001 C CNN
F 3 "~" H 6200 2800 50  0001 C CNN
F 4 "SRN8040-100M" V 6200 2800 50  0001 C CNN "Part Name"
	1    6200 2800
	0    1    1    0   
$EndComp
$Comp
L Device:C C9
U 1 1 5FB17E7A
P 7450 3050
F 0 "C9" H 7565 3096 50  0000 L CNN
F 1 "22uF" H 7565 3005 50  0000 L CNN
F 2 "" H 7488 2900 50  0001 C CNN
F 3 "~" H 7450 3050 50  0001 C CNN
	1    7450 3050
	1    0    0    -1  
$EndComp
$Comp
L Device:C C10
U 1 1 5FB185A0
P 7900 3050
F 0 "C10" H 8015 3096 50  0000 L CNN
F 1 "22uF" H 8015 3005 50  0000 L CNN
F 2 "" H 7938 2900 50  0001 C CNN
F 3 "~" H 7900 3050 50  0001 C CNN
	1    7900 3050
	1    0    0    -1  
$EndComp
$Comp
L Device:C C6
U 1 1 5FB19CB1
P 5550 3850
F 0 "C6" H 5665 3896 50  0000 L CNN
F 1 "DNP" H 5665 3805 50  0000 L CNN
F 2 "" H 5588 3700 50  0001 C CNN
F 3 "~" H 5550 3850 50  0001 C CNN
	1    5550 3850
	1    0    0    -1  
$EndComp
$Comp
L Device:C C8
U 1 1 5FB1A7E8
P 5800 3600
F 0 "C8" V 5548 3600 50  0000 C CNN
F 1 "6.8nF" V 5639 3600 50  0000 C CNN
F 2 "" H 5838 3450 50  0001 C CNN
F 3 "~" H 5800 3600 50  0001 C CNN
	1    5800 3600
	0    1    1    0   
$EndComp
$Comp
L Device:R R12
U 1 1 5FB2197B
P 6050 3850
F 0 "R12" H 6120 3896 50  0000 L CNN
F 1 "6.8k" H 6120 3805 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5980 3850 50  0001 C CNN
F 3 "~" H 6050 3850 50  0001 C CNN
	1    6050 3850
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0115
U 1 1 5FB21FF7
P 5550 4100
F 0 "#PWR0115" H 5550 3850 50  0001 C CNN
F 1 "GND" H 5555 3927 50  0000 C CNN
F 2 "" H 5550 4100 50  0001 C CNN
F 3 "" H 5550 4100 50  0001 C CNN
	1    5550 4100
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0116
U 1 1 5FB223EE
P 6050 4100
F 0 "#PWR0116" H 6050 3850 50  0001 C CNN
F 1 "GND" H 6055 3927 50  0000 C CNN
F 2 "" H 6050 4100 50  0001 C CNN
F 3 "" H 6050 4100 50  0001 C CNN
	1    6050 4100
	1    0    0    -1  
$EndComp
Wire Wire Line
	6050 4100 6050 4000
Wire Wire Line
	6050 3700 6050 3600
Wire Wire Line
	6050 3600 5950 3600
Wire Wire Line
	5550 4100 5550 4000
Wire Wire Line
	5550 3700 5550 3600
Wire Wire Line
	5550 3500 5450 3500
Wire Wire Line
	5650 3600 5550 3600
Connection ~ 5550 3600
Wire Wire Line
	5550 3600 5550 3500
$Comp
L Device:R R14
U 1 1 5FB2726D
P 6450 3550
F 0 "R14" H 6520 3596 50  0000 L CNN
F 1 "10k/1%" H 6520 3505 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 6380 3550 50  0001 C CNN
F 3 "~" H 6450 3550 50  0001 C CNN
	1    6450 3550
	1    0    0    -1  
$EndComp
$Comp
L Device:R R13
U 1 1 5FB29A06
P 6450 3050
F 0 "R13" H 6380 3004 50  0000 R CNN
F 1 "100k/1%" H 6380 3095 50  0000 R CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 6380 3050 50  0001 C CNN
F 3 "~" H 6450 3050 50  0001 C CNN
	1    6450 3050
	-1   0    0    1   
$EndComp
$Comp
L Device:R R15
U 1 1 5FB2A9D8
P 6950 3050
F 0 "R15" H 6880 3004 50  0000 R CNN
F 1 "82k/1%" H 6880 3095 50  0000 R CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 6880 3050 50  0001 C CNN
F 3 "~" H 6950 3050 50  0001 C CNN
	1    6950 3050
	-1   0    0    1   
$EndComp
$Comp
L power:GND #PWR0117
U 1 1 5FB3AA5F
P 6450 3800
F 0 "#PWR0117" H 6450 3550 50  0001 C CNN
F 1 "GND" H 6455 3627 50  0000 C CNN
F 2 "" H 6450 3800 50  0001 C CNN
F 3 "" H 6450 3800 50  0001 C CNN
	1    6450 3800
	1    0    0    -1  
$EndComp
Wire Wire Line
	6450 3800 6450 3700
Wire Wire Line
	5450 3300 6450 3300
Wire Wire Line
	6950 3300 6950 3200
Wire Wire Line
	6450 3400 6450 3300
Connection ~ 6450 3300
Wire Wire Line
	6450 3300 6950 3300
Wire Wire Line
	6450 3300 6450 3200
Wire Wire Line
	5950 2900 5950 2800
Wire Wire Line
	5950 2800 6050 2800
Connection ~ 5950 2900
Wire Wire Line
	6350 2800 6450 2800
Wire Wire Line
	6450 2800 6450 2900
Wire Wire Line
	6950 2900 6950 2800
Wire Wire Line
	6950 2800 6450 2800
Connection ~ 6450 2800
$Comp
L power:GND #PWR0118
U 1 1 5FB45156
P 7450 3400
F 0 "#PWR0118" H 7450 3150 50  0001 C CNN
F 1 "GND" H 7455 3227 50  0000 C CNN
F 2 "" H 7450 3400 50  0001 C CNN
F 3 "" H 7450 3400 50  0001 C CNN
	1    7450 3400
	1    0    0    -1  
$EndComp
Wire Wire Line
	6950 2800 7450 2800
Wire Wire Line
	7450 2800 7450 2900
Connection ~ 6950 2800
Wire Wire Line
	7450 2800 7900 2800
Wire Wire Line
	7900 2800 7900 2900
Connection ~ 7450 2800
Wire Wire Line
	7900 3200 7900 3300
Wire Wire Line
	7900 3300 7450 3300
Wire Wire Line
	7450 3300 7450 3200
Wire Wire Line
	7450 3400 7450 3300
Connection ~ 7450 3300
Wire Wire Line
	8000 2800 7900 2800
Connection ~ 7900 2800
Text HLabel 10000 4000 2    50   Input ~ 0
3.3V_MCU
Text HLabel 10000 4100 2    50   Input ~ 0
3.3V_HP
Text HLabel 10000 4200 2    50   Input ~ 0
3.3V_SPK
Wire Notes Line
	1350 1200 4250 1200
Wire Notes Line
	4250 1200 4250 2350
Wire Notes Line
	4250 2350 1350 2350
Wire Notes Line
	1350 2350 1350 1200
Text Notes 1400 1300 0    50   ~ 0
19V to the speaker amplifier is filtered to improve audio quality.
Text Notes 3150 2550 0    50   ~ 0
The rest of the PCB is supplied with 3.3V, through 5V from an intermediate switching regulator.
Connection ~ 3100 2900
Wire Notes Line
	2950 2450 8400 2450
Wire Notes Line
	8400 2450 8400 4350
Wire Notes Line
	8400 4350 2950 4350
Wire Notes Line
	2950 4350 2950 2450
Text Notes 9150 3650 0    50   ~ 0
TODO: The speaker amplifier draws up to 5mA.
$EndSCHEMATC