EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 1 1
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Transistor_BJT:BD140 Q6
U 1 1 60D5BC11
P 5600 3950
F 0 "Q6" H 5792 3904 50  0000 L CNN
F 1 "BD140" H 5792 3995 50  0000 L CNN
F 2 "Package_TO_SOT_THT:TO-126-3_Vertical" H 5800 3875 50  0001 L CIN
F 3 "http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00001225.pdf" H 5600 3950 50  0001 L CNN
	1    5600 3950
	1    0    0    1   
$EndComp
$Comp
L Device:R R13
U 1 1 60D5F167
P 5700 3000
F 0 "R13" H 5770 3046 50  0000 L CNN
F 1 "1" H 5770 2955 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal" V 5630 3000 50  0001 C CNN
F 3 "~" H 5700 3000 50  0001 C CNN
	1    5700 3000
	1    0    0    -1  
$EndComp
$Comp
L Device:R R14
U 1 1 60D5F89A
P 5700 3500
F 0 "R14" H 5770 3546 50  0000 L CNN
F 1 "1" H 5770 3455 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal" V 5630 3500 50  0001 C CNN
F 3 "~" H 5700 3500 50  0001 C CNN
	1    5700 3500
	1    0    0    -1  
$EndComp
$Comp
L Device:R R15
U 1 1 60D5FC09
P 6150 3500
F 0 "R15" H 6220 3546 50  0000 L CNN
F 1 "10" H 6220 3455 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal" V 6080 3500 50  0001 C CNN
F 3 "~" H 6150 3500 50  0001 C CNN
	1    6150 3500
	1    0    0    -1  
$EndComp
Wire Wire Line
	5700 3150 5700 3250
Wire Wire Line
	6150 3250 5700 3250
Wire Wire Line
	5700 3650 5700 3750
Connection ~ 5700 3250
Wire Wire Line
	5700 3250 5700 3350
Wire Wire Line
	6150 3250 6150 3350
$Comp
L Transistor_BJT:BC557 Q3
U 1 1 60D61651
P 4950 2750
F 0 "Q3" H 5141 2704 50  0000 L CNN
F 1 "BC557" H 5141 2795 50  0000 L CNN
F 2 "Package_TO_SOT_THT:TO-92_Inline" H 5150 2675 50  0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/BC556BTA-D.pdf" H 4950 2750 50  0001 L CNN
	1    4950 2750
	1    0    0    1   
$EndComp
$Comp
L Transistor_BJT:BC547 Q4
U 1 1 60D62ABD
P 4950 3750
F 0 "Q4" H 5141 3796 50  0000 L CNN
F 1 "BC547" H 5141 3705 50  0000 L CNN
F 2 "Package_TO_SOT_THT:TO-92_Inline" H 5150 3675 50  0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/BC550-D.pdf" H 4950 3750 50  0001 L CNN
	1    4950 3750
	1    0    0    -1  
$EndComp
$Comp
L Device:R R11
U 1 1 60D645C8
P 5050 2225
F 0 "R11" H 5120 2271 50  0000 L CNN
F 1 "1k8" H 5120 2180 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4980 2225 50  0001 C CNN
F 3 "~" H 5050 2225 50  0001 C CNN
	1    5050 2225
	1    0    0    -1  
$EndComp
$Comp
L Device:R R12
U 1 1 60D657CD
P 5050 4400
F 0 "R12" H 5120 4446 50  0000 L CNN
F 1 "1k8" H 5120 4355 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4980 4400 50  0001 C CNN
F 3 "~" H 5050 4400 50  0001 C CNN
	1    5050 4400
	1    0    0    -1  
$EndComp
$Comp
L Device:R R7
U 1 1 60D662B0
P 4550 2225
F 0 "R7" H 4620 2271 50  0000 L CNN
F 1 "3k3" H 4620 2180 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4480 2225 50  0001 C CNN
F 3 "~" H 4550 2225 50  0001 C CNN
	1    4550 2225
	1    0    0    -1  
$EndComp
$Comp
L Device:R R8
U 1 1 60D66926
P 4550 2550
F 0 "R8" H 4620 2596 50  0000 L CNN
F 1 "3k3" H 4620 2505 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4480 2550 50  0001 C CNN
F 3 "~" H 4550 2550 50  0001 C CNN
	1    4550 2550
	1    0    0    -1  
$EndComp
$Comp
L Device:R R9
U 1 1 60D6708C
P 4550 2950
F 0 "R9" H 4620 2996 50  0000 L CNN
F 1 "560" H 4620 2905 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4480 2950 50  0001 C CNN
F 3 "~" H 4550 2950 50  0001 C CNN
	1    4550 2950
	1    0    0    -1  
$EndComp
$Comp
L Transistor_BJT:BC547 Q2
U 1 1 60D67540
P 4450 4050
F 0 "Q2" H 4641 4096 50  0000 L CNN
F 1 "BC547" H 4641 4005 50  0000 L CNN
F 2 "Package_TO_SOT_THT:TO-92_Inline" H 4650 3975 50  0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/BC550-D.pdf" H 4450 4050 50  0001 L CNN
	1    4450 4050
	1    0    0    -1  
$EndComp
$Comp
L Device:R R10
U 1 1 60D6943F
P 4550 4400
F 0 "R10" H 4620 4446 50  0000 L CNN
F 1 "100" H 4620 4355 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 4480 4400 50  0001 C CNN
F 3 "~" H 4550 4400 50  0001 C CNN
	1    4550 4400
	1    0    0    -1  
$EndComp
$Comp
L Device:CP C4
U 1 1 60D69E54
P 3900 2525
F 0 "C4" H 4018 2571 50  0000 L CNN
F 1 "47u/25V" H 4018 2480 50  0000 L CNN
F 2 "Capacitor_THT:CP_Radial_D6.3mm_P2.50mm" H 3938 2375 50  0001 C CNN
F 3 "~" H 3900 2525 50  0001 C CNN
	1    3900 2525
	1    0    0    -1  
$EndComp
$Comp
L Device:R R5
U 1 1 60D6B391
P 3900 2950
F 0 "R5" H 3970 2996 50  0000 L CNN
F 1 "2k2" H 3970 2905 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 3830 2950 50  0001 C CNN
F 3 "~" H 3900 2950 50  0001 C CNN
	1    3900 2950
	1    0    0    -1  
$EndComp
$Comp
L Device:CP C3
U 1 1 60D6B8AD
P 3650 3200
F 0 "C3" V 3395 3200 50  0000 C CNN
F 1 "47u/25V" V 3486 3200 50  0000 C CNN
F 2 "Capacitor_THT:CP_Radial_D6.3mm_P2.50mm" H 3688 3050 50  0001 C CNN
F 3 "~" H 3650 3200 50  0001 C CNN
	1    3650 3200
	0    1    1    0   
$EndComp
$Comp
L Transistor_BJT:BC557 Q1
U 1 1 60D6CEDA
P 3800 3550
F 0 "Q1" H 3991 3504 50  0000 L CNN
F 1 "BC557" H 3991 3595 50  0000 L CNN
F 2 "Package_TO_SOT_THT:TO-92_Inline" H 4000 3475 50  0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/BC556BTA-D.pdf" H 3800 3550 50  0001 L CNN
	1    3800 3550
	1    0    0    1   
$EndComp
$Comp
L Device:C C5
U 1 1 60D6F988
P 4400 3750
F 0 "C5" V 4148 3750 50  0000 C CNN
F 1 "10p" V 4239 3750 50  0000 C CNN
F 2 "Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm" H 4438 3600 50  0001 C CNN
F 3 "~" H 4400 3750 50  0001 C CNN
	1    4400 3750
	0    1    1    0   
$EndComp
$Comp
L Device:R R6
U 1 1 60D74286
P 3900 4400
F 0 "R6" H 3970 4446 50  0000 L CNN
F 1 "2k2" H 3970 4355 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 3830 4400 50  0001 C CNN
F 3 "~" H 3900 4400 50  0001 C CNN
	1    3900 4400
	1    0    0    -1  
$EndComp
Wire Wire Line
	4550 2700 4550 2750
Wire Wire Line
	4750 2750 4550 2750
Connection ~ 4550 2750
Wire Wire Line
	4550 2750 4550 2800
Wire Wire Line
	3900 2375 4550 2375
Wire Wire Line
	4250 3250 4250 2750
Wire Wire Line
	4250 2750 3900 2750
Wire Wire Line
	3900 2675 3900 2750
Connection ~ 3900 2750
Wire Wire Line
	3900 2750 3900 2800
Wire Wire Line
	3900 3100 3900 3200
Wire Wire Line
	3800 3200 3900 3200
Connection ~ 3900 3200
Wire Wire Line
	3900 3200 3900 3350
Wire Wire Line
	4550 3100 4550 3750
Wire Wire Line
	4550 3850 4550 3750
Connection ~ 4550 3750
Wire Wire Line
	4750 3750 4550 3750
Wire Wire Line
	4250 3750 4250 4050
Wire Wire Line
	3900 3750 3900 4050
Wire Wire Line
	3900 4050 4250 4050
Connection ~ 4250 4050
Wire Wire Line
	3900 4050 3900 4250
Connection ~ 3900 4050
Wire Wire Line
	5050 3550 5400 3000
Wire Wire Line
	5700 2750 5700 2850
$Comp
L Transistor_BJT:BD139 Q5
U 1 1 60D57C60
P 5600 2550
F 0 "Q5" H 5792 2596 50  0000 L CNN
F 1 "BD139" H 5792 2505 50  0000 L CNN
F 2 "Package_TO_SOT_THT:TO-126-3_Vertical" H 5800 2475 50  0001 L CIN
F 3 "http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00001225.pdf" H 5600 2550 50  0001 L CNN
	1    5600 2550
	1    0    0    -1  
$EndComp
Wire Wire Line
	5050 2550 5400 2550
Wire Wire Line
	5050 2950 5400 3550
Wire Wire Line
	5050 3950 5400 3950
$Comp
L Device:R_POT_TRIM P1
U 1 1 60D83503
P 3250 2250
F 0 "P1" H 3180 2296 50  0000 R CNN
F 1 "50k" H 3180 2205 50  0000 R CNN
F 2 "Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical" V 3180 2250 50  0001 C CNN
F 3 "~" H 3250 2250 50  0001 C CNN
	1    3250 2250
	1    0    0    -1  
$EndComp
$Comp
L Device:R R1
U 1 1 60D855C9
P 3250 2750
F 0 "R1" H 3320 2796 50  0000 L CNN
F 1 "22k" H 3320 2705 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 3180 2750 50  0001 C CNN
F 3 "~" H 3250 2750 50  0001 C CNN
	1    3250 2750
	1    0    0    -1  
$EndComp
$Comp
L Device:CP C1
U 1 1 60D85D92
P 3000 3050
F 0 "C1" V 2745 3050 50  0000 C CNN
F 1 "47u/25V" V 2836 3050 50  0000 C CNN
F 2 "Capacitor_THT:CP_Radial_D6.3mm_P2.50mm" H 3038 2900 50  0001 C CNN
F 3 "~" H 3000 3050 50  0001 C CNN
	1    3000 3050
	0    1    1    0   
$EndComp
$Comp
L Device:R R2
U 1 1 60D87000
P 3250 3300
F 0 "R2" H 3320 3346 50  0000 L CNN
F 1 "102k" H 3320 3255 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 3180 3300 50  0001 C CNN
F 3 "~" H 3250 3300 50  0001 C CNN
	1    3250 3300
	1    0    0    -1  
$EndComp
$Comp
L Device:R R3
U 1 1 60D87628
P 3250 3800
F 0 "R3" H 3320 3846 50  0000 L CNN
F 1 "120k" H 3320 3755 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 3180 3800 50  0001 C CNN
F 3 "~" H 3250 3800 50  0001 C CNN
	1    3250 3800
	1    0    0    -1  
$EndComp
Wire Wire Line
	5400 2050 5400 3000
Wire Wire Line
	5050 2375 5050 2550
Connection ~ 5050 2550
Wire Wire Line
	4550 2375 4550 2400
Connection ~ 4550 2375
Wire Wire Line
	4550 2050 4550 2075
Wire Wire Line
	5050 2050 5050 2075
Wire Wire Line
	5400 3550 5400 4600
Wire Wire Line
	5050 4550 5050 4600
Wire Wire Line
	4550 4550 4550 4600
Wire Wire Line
	3900 4550 3900 4600
Wire Wire Line
	3250 2050 3250 2100
Wire Wire Line
	3400 2050 3400 2250
Wire Wire Line
	3250 2400 3250 2600
Wire Wire Line
	3250 2900 3250 3050
Wire Wire Line
	3150 3050 3250 3050
Connection ~ 3250 3050
Wire Wire Line
	3250 3050 3250 3150
Wire Wire Line
	3250 3450 3250 3550
Wire Wire Line
	3025 3550 3250 3550
Connection ~ 3250 3550
Wire Wire Line
	3250 3550 3250 3650
$Comp
L Device:R R4
U 1 1 60DA2B65
P 3250 4400
F 0 "R4" H 3320 4446 50  0000 L CNN
F 1 "220" H 3320 4355 50  0000 L CNN
F 2 "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal" V 3180 4400 50  0001 C CNN
F 3 "~" H 3250 4400 50  0001 C CNN
	1    3250 4400
	1    0    0    -1  
$EndComp
Wire Wire Line
	3250 3950 3250 4125
Wire Wire Line
	3500 3200 3500 4125
Wire Wire Line
	3500 4125 3250 4125
Connection ~ 3250 4125
Wire Wire Line
	3250 4125 3250 4250
Wire Wire Line
	3600 3550 3250 3550
$Comp
L Device:CP C7
U 1 1 60DA6B97
P 6400 3250
F 0 "C7" V 6655 3250 50  0000 C CNN
F 1 "2200u/25V" V 6564 3250 50  0000 C CNN
F 2 "Capacitor_THT:CP_Radial_D12.5mm_P5.00mm" H 6438 3100 50  0001 C CNN
F 3 "~" H 6400 3250 50  0001 C CNN
	1    6400 3250
	0    -1   -1   0   
$EndComp
$Comp
L Device:Earphone LS1
U 1 1 60DA89A9
P 6750 3900
F 0 "LS1" H 6672 3904 50  0000 R CNN
F 1 "Earphone" H 6672 3995 50  0000 R CNN
F 2 "TerminalBlock:TerminalBlock_bornier-2_P5.08mm" V 6750 4000 50  0001 C CNN
F 3 "~" V 6750 4000 50  0001 C CNN
	1    6750 3900
	1    0    0    1   
$EndComp
$Comp
L Device:C C6
U 1 1 60DAA636
P 6150 4400
F 0 "C6" H 6265 4446 50  0000 L CNN
F 1 "0.1u/63V" H 6265 4355 50  0000 L CNN
F 2 "Capacitor_THT:C_Rect_L10.0mm_W5.0mm_P5.00mm_P7.50mm" H 6188 4250 50  0001 C CNN
F 3 "~" H 6150 4400 50  0001 C CNN
	1    6150 4400
	1    0    0    -1  
$EndComp
Wire Wire Line
	6150 4550 6150 4600
Wire Wire Line
	6150 3650 6150 4250
Wire Wire Line
	6150 3250 6250 3250
Connection ~ 6150 3250
Wire Wire Line
	6550 3250 6750 3250
Wire Wire Line
	6750 3250 6750 3800
Wire Wire Line
	5700 3250 4250 3250
Wire Wire Line
	2850 3050 2550 3050
Wire Wire Line
	2550 3050 2550 4600
Wire Wire Line
	3250 4550 3250 4600
Wire Wire Line
	5700 4150 5700 4600
Wire Wire Line
	5700 2050 5700 2350
Wire Wire Line
	7350 3450 7350 4600
Wire Wire Line
	7350 2050 7350 3150
$Comp
L Device:CP C8
U 1 1 60DE0292
P 7350 3300
F 0 "C8" H 7468 3346 50  0000 L CNN
F 1 "2200u/25V" H 7468 3255 50  0000 L CNN
F 2 "Capacitor_THT:CP_Radial_D12.5mm_P5.00mm" H 7388 3150 50  0001 C CNN
F 3 "~" H 7350 3300 50  0001 C CNN
	1    7350 3300
	1    0    0    -1  
$EndComp
$Comp
L Device:C C2
U 1 1 60D87D7F
P 2875 3550
F 0 "C2" V 2623 3550 50  0000 C CNN
F 1 "470n/63V" V 2714 3550 50  0000 C CNN
F 2 "Capacitor_THT:C_Rect_L10.0mm_W5.0mm_P5.00mm_P7.50mm" H 2913 3400 50  0001 C CNN
F 3 "~" H 2875 3550 50  0001 C CNN
	1    2875 3550
	0    1    1    0   
$EndComp
Wire Wire Line
	5050 3950 5050 4250
Connection ~ 5050 3950
$Comp
L power:GND #PWR0101
U 1 1 60E03A63
P 6150 4850
F 0 "#PWR0101" H 6150 4600 50  0001 C CNN
F 1 "GND" H 6155 4677 50  0000 C CNN
F 2 "" H 6150 4850 50  0001 C CNN
F 3 "" H 6150 4850 50  0001 C CNN
	1    6150 4850
	1    0    0    -1  
$EndComp
$Comp
L Connector:Screw_Terminal_01x02 J1
U 1 1 60E059F3
P 2075 3550
F 0 "J1" H 1993 3767 50  0000 C CNN
F 1 "Screw_Terminal_01x02" H 1993 3676 50  0000 C CNN
F 2 "TerminalBlock:TerminalBlock_bornier-2_P5.08mm" H 2075 3550 50  0001 C CNN
F 3 "~" H 2075 3550 50  0001 C CNN
	1    2075 3550
	-1   0    0    -1  
$EndComp
Wire Wire Line
	2725 3550 2275 3550
Wire Wire Line
	2275 3650 2275 4600
Wire Wire Line
	6750 4100 6750 4600
Text Notes 7400 7500 0    50   ~ 0
Amplifier for headphones - Anish Kulkarni
Text Notes 10580 7640 0    50   ~ 0
1.0
Text Notes 8130 7640 0    50   ~ 0
25/06/2021
Text Notes 7290 7240 0    50   ~ 0
1
Text Notes 7380 7240 0    50   ~ 0
1
$Comp
L Connector:Screw_Terminal_01x02 J2
U 1 1 60D6A9B6
P 8250 3250
F 0 "J2" H 8168 3467 50  0000 C CNN
F 1 "Screw_Terminal_01x02" H 8168 3376 50  0000 C CNN
F 2 "TerminalBlock:TerminalBlock_bornier-2_P5.08mm" H 8250 3250 50  0001 C CNN
F 3 "~" H 8250 3250 50  0001 C CNN
	1    8250 3250
	1    0    0    -1  
$EndComp
Wire Wire Line
	8050 3350 7950 3350
Wire Wire Line
	7950 3350 7950 3450
Wire Wire Line
	7950 3450 7800 3450
Wire Wire Line
	7800 3450 7800 4600
Wire Wire Line
	8050 3250 7800 3250
Wire Wire Line
	7800 3250 7800 2050
Wire Wire Line
	7800 4600 7350 4600
Wire Wire Line
	7350 4600 6750 4600
Connection ~ 7350 4600
Wire Wire Line
	6750 4600 6150 4600
Connection ~ 6750 4600
Wire Wire Line
	6150 4600 5700 4600
Connection ~ 6150 4600
Wire Wire Line
	5700 4600 5400 4600
Wire Wire Line
	5400 4600 5050 4600
Connection ~ 5700 4600
Connection ~ 5400 4600
Wire Wire Line
	5050 4600 4550 4600
Wire Wire Line
	4550 4600 3900 4600
Wire Wire Line
	3900 4600 3250 4600
Wire Wire Line
	2550 4600 2275 4600
Wire Wire Line
	3250 4600 2550 4600
Connection ~ 5050 4600
Connection ~ 2550 4600
Connection ~ 3250 4600
Connection ~ 3900 4600
Connection ~ 4550 4600
Wire Wire Line
	6150 4600 6150 4850
Wire Wire Line
	7800 2050 7350 2050
Wire Wire Line
	5400 2050 5050 2050
Wire Wire Line
	4550 2050 3400 2050
Wire Wire Line
	5050 2050 4550 2050
Wire Wire Line
	3400 2050 3250 2050
Wire Wire Line
	5700 2050 5400 2050
Wire Wire Line
	7350 2050 5700 2050
Connection ~ 3400 2050
Connection ~ 4550 2050
Connection ~ 5050 2050
Connection ~ 5400 2050
Connection ~ 5700 2050
Connection ~ 7350 2050
Text Label 5700 2800 0    50   ~ 0
Vss1
Text Label 5850 3250 0    50   ~ 0
Vload1
Text Label 6750 3500 0    50   ~ 0
Vload2
Text Label 6750 4300 0    50   ~ 0
Vload3
Text Label 5700 4400 0    50   ~ 0
Vss2
Text Label 5700 3700 0    50   ~ 0
Vdd2
Text GLabel 7800 4600 2    50   Input ~ 0
GND
Text GLabel 7800 2050 2    50   Input ~ 0
Vcc
$EndSCHEMATC