EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 4 6
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
Text HLabel 3750 6100 0    60   Input ~ 0
TriangleIn
$Comp
L Device:R R18
U 1 1 5B9BDC5E
P 4000 6400
F 0 "R18" V 4100 6400 50  0000 C CNN
F 1 "330R" V 4000 6400 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3930 6400 50  0001 C CNN
F 3 "" H 4000 6400 50  0001 C CNN
	1    4000 6400
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R17
U 1 1 5B9BDC93
P 4000 6100
F 0 "R17" V 4080 6100 50  0000 C CNN
F 1 "180k" V 4000 6100 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3930 6100 50  0001 C CNN
F 3 "" H 4000 6100 50  0001 C CNN
	1    4000 6100
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R23
U 1 1 5B9BDCD3
P 6000 6600
F 0 "R23" V 6080 6600 50  0000 C CNN
F 1 "10k" V 6000 6600 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5930 6600 50  0001 C CNN
F 3 "" H 6000 6600 50  0001 C CNN
	1    6000 6600
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R26
U 1 1 5B9BDCF2
P 7850 3900
F 0 "R26" V 7930 3900 50  0000 C CNN
F 1 "330R" V 7850 3900 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 7780 3900 50  0001 C CNN
F 3 "" H 7850 3900 50  0001 C CNN
	1    7850 3900
	0    -1   -1   0   
$EndComp
$Comp
L Device:R R25
U 1 1 5B9BDD38
P 7350 5250
F 0 "R25" V 7430 5250 50  0000 C CNN
F 1 "20k" V 7350 5250 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 7280 5250 50  0001 C CNN
F 3 "" H 7350 5250 50  0001 C CNN
	1    7350 5250
	1    0    0    -1  
$EndComp
$Comp
L Device:R R30
U 1 1 5B9BDD5B
P 8350 5250
F 0 "R30" V 8430 5250 50  0000 C CNN
F 1 "20k" V 8350 5250 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 8280 5250 50  0001 C CNN
F 3 "" H 8350 5250 50  0001 C CNN
	1    8350 5250
	1    0    0    -1  
$EndComp
$Comp
L Device:R R31
U 1 1 5B9BDD9E
P 9350 5100
F 0 "R31" V 9430 5100 50  0000 C CNN
F 1 "36k" V 9350 5100 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 9280 5100 50  0001 C CNN
F 3 "" H 9350 5100 50  0001 C CNN
	1    9350 5100
	1    0    0    -1  
$EndComp
$Comp
L Device:R R32
U 1 1 5B9BDDCB
P 9850 4100
F 0 "R32" V 9930 4100 50  0000 C CNN
F 1 "36k" V 9850 4100 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 9780 4100 50  0001 C CNN
F 3 "" H 9850 4100 50  0001 C CNN
	1    9850 4100
	0    1    1    0   
$EndComp
$Comp
L power:GND #PWR048
U 1 1 5B9BE5BF
P 9350 5300
F 0 "#PWR048" H 9350 5050 50  0001 C CNN
F 1 "GND" H 9350 5150 50  0000 C CNN
F 2 "" H 9350 5300 50  0001 C CNN
F 3 "" H 9350 5300 50  0001 C CNN
	1    9350 5300
	1    0    0    -1  
$EndComp
$Comp
L power:-VDC #PWR046
U 1 1 5B9BE689
P 7850 5650
F 0 "#PWR046" H 7850 5550 50  0001 C CNN
F 1 "-VDC" H 7850 5900 50  0000 C CNN
F 2 "" H 7850 5650 50  0001 C CNN
F 3 "" H 7850 5650 50  0001 C CNN
	1    7850 5650
	-1   0    0    1   
$EndComp
$Comp
L power:+VDC #PWR045
U 1 1 5B9BE73D
P 7850 1750
F 0 "#PWR045" H 7850 1650 50  0001 C CNN
F 1 "+VDC" H 7850 2000 50  0000 C CNN
F 2 "" H 7850 1750 50  0001 C CNN
F 3 "" H 7850 1750 50  0001 C CNN
	1    7850 1750
	1    0    0    -1  
$EndComp
Wire Wire Line
	9350 5300 9350 5250
Wire Wire Line
	8700 4300 8700 4250
Wire Wire Line
	8700 4250 8650 4250
Wire Wire Line
	7850 1750 7850 1800
Wire Wire Line
	10250 4800 10300 4800
Wire Wire Line
	10000 4100 10300 4100
Wire Wire Line
	9700 4100 9250 4100
Wire Wire Line
	9650 4900 9350 4900
Wire Wire Line
	9350 4950 9350 4900
Connection ~ 9350 4900
$Comp
L power:GND #PWR047
U 1 1 5B9BF35A
P 8700 4300
F 0 "#PWR047" H 8700 4050 50  0001 C CNN
F 1 "GND" H 8700 4150 50  0000 C CNN
F 2 "" H 8700 4300 50  0001 C CNN
F 3 "" H 8700 4300 50  0001 C CNN
	1    8700 4300
	1    0    0    -1  
$EndComp
Connection ~ 10300 4800
Text HLabel 10500 4800 2    60   Output ~ 0
Output
Text HLabel 1300 4450 0    60   Input ~ 0
Waveshape
Wire Wire Line
	9250 4100 9250 4700
Wire Wire Line
	10300 4100 10300 4800
$Comp
L Device:R_POT_TRIM RV4
U 1 1 5BA6529A
P 7850 3550
AR Path="/5BA6529A" Ref="RV4"  Part="1" 
AR Path="/5B94158D/5BA6529A" Ref="RV4"  Part="1" 
F 0 "RV4" V 7675 3550 50  0000 C CNN
F 1 "100k" V 7750 3550 50  0000 C CNN
F 2 "Potentiometer_SMD:Potentiometer_Bourns_3214W_Vertical" H 7850 3550 50  0001 C CNN
F 3 "" H 7850 3550 50  0001 C CNN
	1    7850 3550
	0    -1   -1   0   
$EndComp
Wire Wire Line
	9250 4700 9650 4700
Wire Wire Line
	10300 4800 10500 4800
Wire Wire Line
	7850 5650 7850 5600
$Comp
L power:GND #PWR041
U 1 1 5CA69AB8
P 5650 6150
F 0 "#PWR041" H 5650 5900 50  0001 C CNN
F 1 "GND" H 5655 5977 50  0000 C CNN
F 2 "" H 5650 6150 50  0001 C CNN
F 3 "" H 5650 6150 50  0001 C CNN
	1    5650 6150
	0    1    1    0   
$EndComp
$Comp
L Amplifier_Operational:LM13700 U2
U 3 1 5CA6BA6A
P 4750 6600
F 0 "U2" H 4750 6967 50  0000 C CNN
F 1 "LM13700" H 4750 6876 50  0000 C CNN
F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 4450 6625 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm13700.pdf" H 4450 6625 50  0001 C CNN
	3    4750 6600
	1    0    0    1   
$EndComp
$Comp
L Amplifier_Operational:LM13700 U2
U 4 1 5CA6BE3F
P 4250 1800
F 0 "U2" H 4150 2148 50  0000 C CNN
F 1 "LM13700" H 4150 2057 50  0000 C CNN
F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 3950 1825 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm13700.pdf" H 3950 1825 50  0001 C CNN
	4    4250 1800
	1    0    0    -1  
$EndComp
NoConn ~ 4350 1900
NoConn ~ 3950 1800
Wire Wire Line
	4450 6500 4200 6500
Wire Wire Line
	4450 6700 4200 6700
Wire Wire Line
	4200 6500 4200 6400
Wire Wire Line
	4200 6100 4150 6100
$Comp
L Device:R_POT_TRIM RV3
U 1 1 5CA827A8
P 3700 6600
F 0 "RV3" H 3630 6554 50  0000 R CNN
F 1 "100R" H 3630 6645 50  0000 R CNN
F 2 "Potentiometer_SMD:Potentiometer_Bourns_3214W_Vertical" H 3700 6600 50  0001 C CNN
F 3 "~" H 3700 6600 50  0001 C CNN
	1    3700 6600
	-1   0    0    1   
$EndComp
$Comp
L Device:R R19
U 1 1 5CA8283B
P 4000 6850
F 0 "R19" V 3900 6850 50  0000 C CNN
F 1 "330R" V 4000 6850 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3930 6850 50  0001 C CNN
F 3 "~" H 4000 6850 50  0001 C CNN
	1    4000 6850
	0    1    1    0   
$EndComp
Wire Wire Line
	4200 6700 4200 6850
Wire Wire Line
	4200 6850 4150 6850
Wire Wire Line
	4150 6400 4200 6400
Wire Wire Line
	3850 6400 3700 6400
Wire Wire Line
	3700 6400 3700 6450
Wire Wire Line
	3700 6750 3700 6850
Wire Wire Line
	3700 6850 3850 6850
Wire Wire Line
	3750 6100 3850 6100
$Comp
L power:GND #PWR037
U 1 1 5CA88B35
P 3450 6600
F 0 "#PWR037" H 3450 6350 50  0001 C CNN
F 1 "GND" V 3455 6472 50  0000 R CNN
F 2 "" H 3450 6600 50  0001 C CNN
F 3 "" H 3450 6600 50  0001 C CNN
	1    3450 6600
	0    1    1    0   
$EndComp
Wire Wire Line
	3450 6600 3550 6600
$Comp
L Device:R R21
U 1 1 5CA8AAE0
P 5050 6150
F 0 "R21" V 4950 6150 50  0000 C CNN
F 1 "33k" V 5050 6150 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4980 6150 50  0001 C CNN
F 3 "~" H 5050 6150 50  0001 C CNN
	1    5050 6150
	-1   0    0    1   
$EndComp
$Comp
L power:GND #PWR044
U 1 1 5CA8D92A
P 7500 3050
F 0 "#PWR044" H 7500 2800 50  0001 C CNN
F 1 "GND" H 7505 2877 50  0000 C CNN
F 2 "" H 7500 3050 50  0001 C CNN
F 3 "" H 7500 3050 50  0001 C CNN
	1    7500 3050
	1    0    0    -1  
$EndComp
Wire Wire Line
	7500 3050 7500 2900
$Comp
L Device:R R22
U 1 1 5CA90223
P 6650 2500
F 0 "R22" V 6550 2500 50  0000 C CNN
F 1 "12k" V 6650 2500 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 6580 2500 50  0001 C CNN
F 3 "~" H 6650 2500 50  0001 C CNN
	1    6650 2500
	0    1    1    0   
$EndComp
$Comp
L Device:R R24
U 1 1 5CA9029B
P 7500 2250
F 0 "R24" V 7600 2250 50  0000 C CNN
F 1 "2k" V 7500 2250 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 7430 2250 50  0001 C CNN
F 3 "~" H 7500 2250 50  0001 C CNN
	1    7500 2250
	-1   0    0    1   
$EndComp
Wire Wire Line
	7500 2400 7500 2500
Wire Wire Line
	7500 2100 7500 1750
$Comp
L Device:Opamp_Dual_Generic U4
U 1 1 5CA94C04
P 1850 4350
F 0 "U4" H 1850 4717 50  0000 C CNN
F 1 "OPA2180" H 1850 4626 50  0000 C CNN
F 2 "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm" H 1850 4350 50  0001 C CNN
F 3 "~" H 1850 4350 50  0001 C CNN
	1    1850 4350
	1    0    0    -1  
$EndComp
$Comp
L Device:R R20
U 1 1 5CAA0CE7
P 1900 4800
F 0 "R20" V 1800 4800 50  0000 C CNN
F 1 "240k" V 1900 4800 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 1830 4800 50  0001 C CNN
F 3 "~" H 1900 4800 50  0001 C CNN
	1    1900 4800
	0    1    1    0   
$EndComp
Wire Wire Line
	1450 4450 1550 4450
Wire Wire Line
	1450 4800 1750 4800
$Comp
L Amplifier_Operational:TL072 U6
U 2 1 5CA93327
P 9950 4800
F 0 "U6" H 9950 4433 50  0000 C CNN
F 1 "TL072" H 9950 4524 50  0000 C CNN
F 2 "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm" H 9950 4800 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl071.pdf" H 9950 4800 50  0001 C CNN
	2    9950 4800
	1    0    0    1   
$EndComp
Wire Wire Line
	5650 6150 5700 6150
$Comp
L Device:Opamp_Dual_Generic U4
U 3 1 5CC35633
P 2250 1450
F 0 "U4" H 2208 1496 50  0000 L CNN
F 1 "OPA2180" H 2208 1405 50  0000 L CNN
F 2 "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm" H 2250 1450 50  0001 C CNN
F 3 "~" H 2250 1450 50  0001 C CNN
	3    2250 1450
	1    0    0    -1  
$EndComp
$Comp
L power:+VDC #PWR039
U 1 1 5CC362DF
P 2150 1000
F 0 "#PWR039" H 2150 900 50  0001 C CNN
F 1 "+VDC" H 2150 1275 50  0000 C CNN
F 2 "" H 2150 1000 50  0001 C CNN
F 3 "" H 2150 1000 50  0001 C CNN
	1    2150 1000
	1    0    0    -1  
$EndComp
$Comp
L power:-VDC #PWR040
U 1 1 5CC36D32
P 2150 1900
F 0 "#PWR040" H 2150 1800 50  0001 C CNN
F 1 "-VDC" H 2150 2175 50  0000 C CNN
F 2 "" H 2150 1900 50  0001 C CNN
F 3 "" H 2150 1900 50  0001 C CNN
	1    2150 1900
	-1   0    0    1   
$EndComp
$Comp
L Device:Opamp_Dual_Generic U4
U 2 1 5CD2B7CE
P 4650 3850
F 0 "U4" H 4650 4217 50  0000 C CNN
F 1 "OPA2180" H 4650 4126 50  0000 C CNN
F 2 "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm" H 4650 3850 50  0001 C CNN
F 3 "~" H 4650 3850 50  0001 C CNN
	2    4650 3850
	1    0    0    -1  
$EndComp
Wire Wire Line
	4950 3850 5050 3850
$Comp
L Device:R R14
U 1 1 5CD3FE4A
P 3850 3750
F 0 "R14" V 3750 3750 50  0000 C CNN
F 1 "2k2" V 3850 3750 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3780 3750 50  0001 C CNN
F 3 "~" H 3850 3750 50  0001 C CNN
	1    3850 3750
	1    0    0    -1  
$EndComp
$Comp
L Device:R R15
U 1 1 5CD4141E
P 4650 4350
F 0 "R15" V 4550 4350 50  0000 C CNN
F 1 "10k" V 4650 4350 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4580 4350 50  0001 C CNN
F 3 "~" H 4650 4350 50  0001 C CNN
	1    4650 4350
	0    1    1    0   
$EndComp
Wire Wire Line
	4500 4350 4250 4350
Wire Wire Line
	3850 3900 3850 3950
Wire Wire Line
	3850 4350 3850 4250
Wire Wire Line
	4350 3950 4250 3950
Wire Wire Line
	4250 3950 4250 4350
Wire Wire Line
	3850 3600 3850 3550
$Comp
L power:+VDC #PWR036
U 1 1 5CD6ED5D
P 3850 3550
F 0 "#PWR036" H 3850 3450 50  0001 C CNN
F 1 "+VDC" H 3850 3825 50  0000 C CNN
F 2 "" H 3850 3550 50  0001 C CNN
F 3 "" H 3850 3550 50  0001 C CNN
	1    3850 3550
	1    0    0    -1  
$EndComp
Wire Wire Line
	1300 4450 1450 4450
$Comp
L Device:R R13
U 1 1 5FF2702E
P 3850 4100
F 0 "R13" V 3750 4100 50  0000 C CNN
F 1 "20k" V 3850 4100 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3780 4100 50  0001 C CNN
F 3 "~" H 3850 4100 50  0001 C CNN
	1    3850 4100
	1    0    0    -1  
$EndComp
$Comp
L Device:R R29
U 1 1 5FF2901E
P 7850 1950
F 0 "R29" V 7750 1950 50  0000 C CNN
F 1 "10k" V 7850 1950 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 7780 1950 50  0001 C CNN
F 3 "~" H 7850 1950 50  0001 C CNN
	1    7850 1950
	-1   0    0    1   
$EndComp
$Comp
L Device:Q_DUAL_PNP_PNP_C1B1B2C2E2E1 Q7
U 1 1 61D6DE07
P 7250 4250
AR Path="/61D6DE07" Ref="Q7"  Part="1" 
AR Path="/5B94158D/61D6DE07" Ref="Q7"  Part="1" 
F 0 "Q7" H 7441 4204 50  0000 L CNN
F 1 "DMMT5401" H 7441 4295 50  0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23-6" H 7450 4350 50  0001 C CNN
F 3 "" H 7250 4250 50  0001 C CNN
	1    7250 4250
	1    0    0    1   
$EndComp
$Comp
L Device:Q_DUAL_PNP_PNP_C1B1B2C2E2E1 Q7
U 2 1 61D6E52D
P 8450 4250
AR Path="/61D6E52D" Ref="Q7"  Part="2" 
AR Path="/5B94158D/61D6E52D" Ref="Q7"  Part="2" 
F 0 "Q7" H 8641 4204 50  0000 L CNN
F 1 "DMMT5401" H 8641 4295 50  0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23-6" H 8650 4350 50  0001 C CNN
F 3 "" H 8450 4250 50  0001 C CNN
	2    8450 4250
	-1   0    0    1   
$EndComp
Wire Wire Line
	7350 3900 7350 4050
Wire Wire Line
	7350 3900 7700 3900
Wire Wire Line
	8350 3900 8350 4050
Wire Wire Line
	8000 3900 8350 3900
Wire Wire Line
	8350 3900 8350 3550
Wire Wire Line
	8000 3550 8350 3550
Connection ~ 8350 3900
Wire Wire Line
	7350 3550 7350 3900
Wire Wire Line
	7350 3550 7700 3550
Connection ~ 7350 3900
Wire Wire Line
	9250 4700 8350 4700
Wire Wire Line
	8350 4700 8350 4450
Connection ~ 9250 4700
Wire Wire Line
	7350 4900 7350 4450
Wire Wire Line
	7350 4900 9350 4900
Wire Wire Line
	8350 5400 8350 5600
Wire Wire Line
	7350 5600 7350 5400
Wire Wire Line
	7350 5100 7350 4900
Connection ~ 7350 4900
Wire Wire Line
	8350 5100 8350 4700
Connection ~ 8350 4700
Connection ~ 7850 5600
Wire Wire Line
	7850 5600 7350 5600
Wire Wire Line
	7850 5600 8350 5600
Wire Wire Line
	5050 6300 5050 6500
$Comp
L Device:Q_PNP_BEC Q8
U 1 1 61E37995
P 7750 2500
F 0 "Q8" H 7941 2454 50  0000 L CNN
F 1 "MMBT5401" H 7941 2545 50  0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 7950 2600 50  0001 C CNN
F 3 "~" H 7750 2500 50  0001 C CNN
	1    7750 2500
	1    0    0    1   
$EndComp
$Comp
L power:+VDC #PWR0103
U 1 1 61E4E07D
P 7500 1750
F 0 "#PWR0103" H 7500 1650 50  0001 C CNN
F 1 "+VDC" H 7500 2025 50  0000 C CNN
F 2 "" H 7500 1750 50  0001 C CNN
F 3 "" H 7500 1750 50  0001 C CNN
	1    7500 1750
	1    0    0    -1  
$EndComp
Wire Wire Line
	2300 4350 2300 4800
Wire Wire Line
	2050 4800 2300 4800
Connection ~ 1450 4450
Wire Wire Line
	1450 4450 1450 4800
Wire Wire Line
	2150 4350 2300 4350
$Comp
L power:GND #PWR0104
U 1 1 61E47E1E
P 1450 4250
F 0 "#PWR0104" H 1450 4000 50  0001 C CNN
F 1 "GND" V 1455 4122 50  0000 R CNN
F 2 "" H 1450 4250 50  0001 C CNN
F 3 "" H 1450 4250 50  0001 C CNN
	1    1450 4250
	0    1    1    0   
$EndComp
Wire Wire Line
	1450 4250 1550 4250
Wire Wire Line
	4200 6400 4200 6100
Connection ~ 4200 6400
$Comp
L Device:R R38
U 1 1 61E66393
P 4350 6050
F 0 "R38" H 4420 6096 50  0000 L CNN
F 1 "100k" H 4420 6005 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4280 6050 50  0001 C CNN
F 3 "~" H 4350 6050 50  0001 C CNN
	1    4350 6050
	1    0    0    -1  
$EndComp
$Comp
L power:+VDC #PWR0105
U 1 1 61E66C5E
P 4350 5800
F 0 "#PWR0105" H 4350 5700 50  0001 C CNN
F 1 "+VDC" H 4350 6075 50  0000 C CNN
F 2 "" H 4350 5800 50  0001 C CNN
F 3 "" H 4350 5800 50  0001 C CNN
	1    4350 5800
	1    0    0    -1  
$EndComp
Wire Wire Line
	4350 5800 4350 5900
Wire Wire Line
	4350 6200 4350 6600
Wire Wire Line
	4350 6600 4450 6600
$Comp
L Amplifier_Operational:TL072 U6
U 1 1 61E86CE1
P 6000 6250
F 0 "U6" H 6000 6617 50  0000 C CNN
F 1 "TL072" H 6000 6526 50  0000 C CNN
F 2 "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm" H 6000 6250 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl071.pdf" H 6000 6250 50  0001 C CNN
	1    6000 6250
	1    0    0    -1  
$EndComp
Wire Wire Line
	5700 6350 5600 6350
Wire Wire Line
	5600 6350 5600 6600
Wire Wire Line
	5600 6600 5850 6600
Wire Wire Line
	6150 6600 6400 6600
Wire Wire Line
	6400 6600 6400 6250
Wire Wire Line
	6400 6250 6300 6250
Wire Wire Line
	5050 6600 5600 6600
Wire Wire Line
	7850 2100 7850 2300
Wire Wire Line
	7550 2500 7500 2500
Connection ~ 7500 2500
$Comp
L Device:R R45
U 1 1 61EC7EDC
P 7500 2750
F 0 "R45" H 7430 2704 50  0000 R CNN
F 1 "10k" H 7430 2795 50  0000 R CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 7430 2750 50  0001 C CNN
F 3 "~" H 7500 2750 50  0001 C CNN
	1    7500 2750
	-1   0    0    1   
$EndComp
Wire Wire Line
	7500 2600 7500 2500
$Comp
L Device:R R44
U 1 1 61ECE28C
P 6250 2500
F 0 "R44" V 6043 2500 50  0000 C CNN
F 1 "2k" V 6134 2500 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 6180 2500 50  0001 C CNN
F 3 "~" H 6250 2500 50  0001 C CNN
	1    6250 2500
	0    1    1    0   
$EndComp
Wire Wire Line
	6400 2500 6500 2500
$Comp
L Transistor_BJT:MMBT3904 Q4
U 1 1 61ED1BB8
P 5850 2800
F 0 "Q4" H 6041 2846 50  0000 L CNN
F 1 "MMBT3904" H 6041 2755 50  0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 6050 2725 50  0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/2N3903-D.PDF" H 5850 2800 50  0001 L CNN
	1    5850 2800
	1    0    0    -1  
$EndComp
$Comp
L Device:R R43
U 1 1 61ED9093
P 5950 3200
F 0 "R43" H 6020 3246 50  0000 L CNN
F 1 "100R" H 6020 3155 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5880 3200 50  0001 C CNN
F 3 "~" H 5950 3200 50  0001 C CNN
	1    5950 3200
	1    0    0    -1  
$EndComp
$Comp
L Device:R R42
U 1 1 61ED9BC6
P 5550 3050
F 0 "R42" H 5620 3096 50  0000 L CNN
F 1 "1k" H 5620 3005 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5480 3050 50  0001 C CNN
F 3 "~" H 5550 3050 50  0001 C CNN
	1    5550 3050
	1    0    0    -1  
$EndComp
$Comp
L Device:R R41
U 1 1 61EDADE4
P 5550 2550
F 0 "R41" H 5620 2596 50  0000 L CNN
F 1 "27k" H 5620 2505 50  0000 L CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5480 2550 50  0001 C CNN
F 3 "~" H 5550 2550 50  0001 C CNN
	1    5550 2550
	1    0    0    -1  
$EndComp
$Comp
L Device:R R40
U 1 1 61EDB635
P 5250 2800
F 0 "R40" V 5043 2800 50  0000 C CNN
F 1 "30k" V 5134 2800 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5180 2800 50  0001 C CNN
F 3 "~" H 5250 2800 50  0001 C CNN
	1    5250 2800
	0    1    1    0   
$EndComp
Wire Wire Line
	6100 2500 5950 2500
Wire Wire Line
	5950 2500 5950 2600
Wire Wire Line
	5950 3000 5950 3050
Wire Wire Line
	5950 3350 5950 3400
Wire Wire Line
	5550 3200 5550 3250
Wire Wire Line
	5550 2900 5550 2800
Wire Wire Line
	5550 2800 5650 2800
Wire Wire Line
	5550 2800 5550 2700
Connection ~ 5550 2800
Wire Wire Line
	5550 2800 5400 2800
Wire Wire Line
	5550 2350 5550 2400
$Comp
L power:+VDC #PWR0106
U 1 1 61EFC037
P 5550 2350
F 0 "#PWR0106" H 5550 2250 50  0001 C CNN
F 1 "+VDC" H 5550 2625 50  0000 C CNN
F 2 "" H 5550 2350 50  0001 C CNN
F 3 "" H 5550 2350 50  0001 C CNN
	1    5550 2350
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0109
U 1 1 61EFC6B6
P 5550 3250
F 0 "#PWR0109" H 5550 3000 50  0001 C CNN
F 1 "GND" H 5555 3077 50  0000 C CNN
F 2 "" H 5550 3250 50  0001 C CNN
F 3 "" H 5550 3250 50  0001 C CNN
	1    5550 3250
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0110
U 1 1 61EFCCFE
P 5950 3400
F 0 "#PWR0110" H 5950 3150 50  0001 C CNN
F 1 "GND" H 5955 3227 50  0000 C CNN
F 2 "" H 5950 3400 50  0001 C CNN
F 3 "" H 5950 3400 50  0001 C CNN
	1    5950 3400
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR0111
U 1 1 61F01F19
P 4250 3750
F 0 "#PWR0111" H 4250 3500 50  0001 C CNN
F 1 "GND" V 4255 3622 50  0000 R CNN
F 2 "" H 4250 3750 50  0001 C CNN
F 3 "" H 4250 3750 50  0001 C CNN
	1    4250 3750
	0    1    1    0   
$EndComp
Wire Wire Line
	4250 3750 4350 3750
Wire Wire Line
	5050 3850 5050 4350
Wire Wire Line
	4800 4350 5050 4350
Wire Wire Line
	4250 4350 3850 4350
Connection ~ 4250 4350
$Comp
L Device:R R28
U 1 1 61F452CB
P 3500 4350
F 0 "R28" V 3293 4350 50  0000 C CNN
F 1 "33k" V 3384 4350 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3430 4350 50  0001 C CNN
F 3 "~" H 3500 4350 50  0001 C CNN
	1    3500 4350
	0    1    1    0   
$EndComp
$Comp
L Device:R R27
U 1 1 61F46033
P 3150 4350
F 0 "R27" V 2943 4350 50  0000 C CNN
F 1 "1k" V 3034 4350 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3080 4350 50  0001 C CNN
F 3 "~" H 3150 4350 50  0001 C CNN
	1    3150 4350
	0    1    1    0   
$EndComp
$Comp
L Device:R R16
U 1 1 61F46B97
P 2850 4700
F 0 "R16" V 2643 4700 50  0000 C CNN
F 1 "8k2" V 2734 4700 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2780 4700 50  0001 C CNN
F 3 "~" H 2850 4700 50  0001 C CNN
	1    2850 4700
	0    1    1    0   
$EndComp
$Comp
L Transistor_BJT:MMBT3904 Q3
U 1 1 61F47376
P 3550 4800
F 0 "Q3" V 3878 4800 50  0000 C CNN
F 1 "MMBT3904" V 3787 4800 50  0000 C CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 3750 4725 50  0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/2N3903-D.PDF" H 3550 4800 50  0001 L CNN
	1    3550 4800
	0    1    -1   0   
$EndComp
$Comp
L power:GND #PWR0112
U 1 1 61F49879
P 3550 5150
F 0 "#PWR0112" H 3550 4900 50  0001 C CNN
F 1 "GND" H 3555 4977 50  0000 C CNN
F 2 "" H 3550 5150 50  0001 C CNN
F 3 "" H 3550 5150 50  0001 C CNN
	1    3550 5150
	1    0    0    -1  
$EndComp
Wire Wire Line
	3550 5150 3550 5050
Wire Wire Line
	3000 4700 3100 4700
Wire Wire Line
	3300 4350 3350 4350
Wire Wire Line
	3650 4350 3850 4350
Connection ~ 3850 4350
Wire Wire Line
	3850 4350 3850 4700
Wire Wire Line
	3850 4700 3750 4700
Wire Wire Line
	3000 4350 2600 4350
Wire Wire Line
	2600 4350 2600 4700
Wire Wire Line
	2700 4700 2600 4700
$Comp
L Device:R R39
U 1 1 61F7F933
P 4850 2800
F 0 "R39" V 4643 2800 50  0000 C CNN
F 1 "9k1" V 4734 2800 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4780 2800 50  0001 C CNN
F 3 "~" H 4850 2800 50  0001 C CNN
	1    4850 2800
	0    1    1    0   
$EndComp
Wire Wire Line
	5100 2800 5000 2800
$Comp
L Device:D D2
U 1 1 61F98022
P 3300 5050
F 0 "D2" H 3300 4833 50  0000 C CNN
F 1 "1N4148" H 3300 4924 50  0000 C CNN
F 2 "Diode_SMD:D_SOD-323_HandSoldering" H 3300 5050 50  0001 C CNN
F 3 "~" H 3300 5050 50  0001 C CNN
	1    3300 5050
	-1   0    0    1   
$EndComp
Wire Wire Line
	3450 5050 3550 5050
Connection ~ 3550 5050
Wire Wire Line
	3550 5050 3550 5000
Wire Wire Line
	3150 5050 3100 5050
Wire Wire Line
	3100 5050 3100 4700
Connection ~ 3100 4700
Wire Wire Line
	3100 4700 3350 4700
$Comp
L Amplifier_Operational:TL072 U6
U 3 1 61FB29DB
P 950 1450
F 0 "U6" H 908 1496 50  0000 L CNN
F 1 "TL072" H 908 1405 50  0000 L CNN
F 2 "Package_SO:SOIC-8_3.9x4.9mm_P1.27mm" H 950 1450 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl071.pdf" H 950 1450 50  0001 C CNN
	3    950  1450
	1    0    0    -1  
$EndComp
$Comp
L power:+VDC #PWR0113
U 1 1 61FB7247
P 850 1000
F 0 "#PWR0113" H 850 900 50  0001 C CNN
F 1 "+VDC" H 850 1275 50  0000 C CNN
F 2 "" H 850 1000 50  0001 C CNN
F 3 "" H 850 1000 50  0001 C CNN
	1    850  1000
	1    0    0    -1  
$EndComp
$Comp
L power:-VDC #PWR0114
U 1 1 61FB7A91
P 850 1900
F 0 "#PWR0114" H 850 1800 50  0001 C CNN
F 1 "-VDC" H 850 2175 50  0000 C CNN
F 2 "" H 850 1900 50  0001 C CNN
F 3 "" H 850 1900 50  0001 C CNN
	1    850  1900
	-1   0    0    1   
$EndComp
$Comp
L Connector:TestPoint TP2
U 1 1 61F19F39
P 10300 4950
F 0 "TP2" H 10242 4976 50  0000 R CNN
F 1 "TestPoint" H 10242 5067 50  0000 R CNN
F 2 "TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm" H 10500 4950 50  0001 C CNN
F 3 "~" H 10500 4950 50  0001 C CNN
	1    10300 4950
	-1   0    0    1   
$EndComp
$Comp
L Connector:TestPoint TP1
U 1 1 61F1B13A
P 6400 6700
F 0 "TP1" H 6342 6726 50  0000 R CNN
F 1 "TestPoint" H 6342 6817 50  0000 R CNN
F 2 "TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm" H 6600 6700 50  0001 C CNN
F 3 "~" H 6600 6700 50  0001 C CNN
	1    6400 6700
	-1   0    0    1   
$EndComp
Wire Wire Line
	6400 6700 6400 6600
Connection ~ 6400 6600
Wire Wire Line
	10300 4950 10300 4800
Wire Wire Line
	6800 2500 7500 2500
Wire Wire Line
	7850 2700 7850 3400
Wire Wire Line
	5050 4350 5050 6000
Connection ~ 5050 4350
Wire Wire Line
	2300 2800 2300 4350
Wire Wire Line
	2300 2800 4700 2800
Connection ~ 2300 4350
Wire Wire Line
	2300 4350 2600 4350
Connection ~ 2600 4350
Connection ~ 5600 6600
Wire Wire Line
	6400 6250 6400 4250
Wire Wire Line
	6400 4250 7050 4250
Connection ~ 6400 6250
$Comp
L Device:C C?
U 1 1 61FD9CA1
P 2650 1250
AR Path="/61FD9CA1" Ref="C?"  Part="1" 
AR Path="/5B94158D/61FD9CA1" Ref="C13"  Part="1" 
F 0 "C13" H 2675 1350 50  0000 L CNN
F 1 "100nF" H 2675 1150 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 2688 1100 50  0001 C CNN
F 3 "" H 2650 1250 50  0001 C CNN
	1    2650 1250
	1    0    0    -1  
$EndComp
$Comp
L Device:C C?
U 1 1 61FD9CA7
P 2650 1650
AR Path="/61FD9CA7" Ref="C?"  Part="1" 
AR Path="/5B94158D/61FD9CA7" Ref="C14"  Part="1" 
F 0 "C14" H 2675 1750 50  0000 L CNN
F 1 "100nF" H 2675 1550 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 2688 1500 50  0001 C CNN
F 3 "" H 2650 1650 50  0001 C CNN
	1    2650 1650
	1    0    0    -1  
$EndComp
Wire Wire Line
	2650 1850 2650 1800
Wire Wire Line
	2650 1050 2650 1100
Wire Wire Line
	1450 1850 1450 1800
Wire Wire Line
	1450 1050 1450 1100
$Comp
L Device:C C?
U 1 1 61FD9CBA
P 1450 1250
AR Path="/61FD9CBA" Ref="C?"  Part="1" 
AR Path="/5B94158D/61FD9CBA" Ref="C11"  Part="1" 
F 0 "C11" H 1475 1350 50  0000 L CNN
F 1 "100nF" H 1475 1150 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 1488 1100 50  0001 C CNN
F 3 "" H 1450 1250 50  0001 C CNN
	1    1450 1250
	1    0    0    -1  
$EndComp
$Comp
L Device:C C?
U 1 1 61FD9CC0
P 1450 1650
AR Path="/61FD9CC0" Ref="C?"  Part="1" 
AR Path="/5B94158D/61FD9CC0" Ref="C12"  Part="1" 
F 0 "C12" H 1475 1750 50  0000 L CNN
F 1 "100nF" H 1475 1550 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 1488 1500 50  0001 C CNN
F 3 "" H 1450 1650 50  0001 C CNN
	1    1450 1650
	1    0    0    -1  
$EndComp
Wire Wire Line
	2650 1400 2650 1450
Wire Wire Line
	1450 1400 1450 1450
Wire Wire Line
	1450 1450 1700 1450
Connection ~ 1450 1450
Wire Wire Line
	1450 1450 1450 1500
Wire Wire Line
	2650 1450 2900 1450
Connection ~ 2650 1450
Wire Wire Line
	2650 1450 2650 1500
Wire Wire Line
	2650 1050 2150 1050
Wire Wire Line
	2150 1050 2150 1150
Wire Wire Line
	2150 1050 2150 1000
Connection ~ 2150 1050
Wire Wire Line
	2150 1750 2150 1850
Wire Wire Line
	2150 1850 2650 1850
Connection ~ 2150 1850
Wire Wire Line
	2150 1850 2150 1900
Wire Wire Line
	850  1850 850  1900
Wire Wire Line
	850  1850 1450 1850
Wire Wire Line
	850  1750 850  1850
Connection ~ 850  1850
Wire Wire Line
	850  1050 850  1150
Wire Wire Line
	850  1050 1450 1050
Wire Wire Line
	850  1050 850  1000
Connection ~ 850  1050
$Comp
L power:GND #PWR0124
U 1 1 6204C74A
P 1700 1450
F 0 "#PWR0124" H 1700 1200 50  0001 C CNN
F 1 "GND" V 1705 1322 50  0000 R CNN
F 2 "" H 1700 1450 50  0001 C CNN
F 3 "" H 1700 1450 50  0001 C CNN
	1    1700 1450
	0    -1   -1   0   
$EndComp
$Comp
L power:GND #PWR0125
U 1 1 6204CE01
P 2900 1450
F 0 "#PWR0125" H 2900 1200 50  0001 C CNN
F 1 "GND" V 2905 1322 50  0000 R CNN
F 2 "" H 2900 1450 50  0001 C CNN
F 3 "" H 2900 1450 50  0001 C CNN
	1    2900 1450
	0    -1   -1   0   
$EndComp
Text Notes 4350 2450 0    50   ~ 0
BC848?\nR39 -> 18k\nR44 -> 3k3
$EndSCHEMATC