EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 2 4
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Amplifier_Operational:LM13700 U3
U 1 1 5FF0E3A8
P 4350 1550
F 0 "U3" H 4350 1917 50  0000 C CNN
F 1 "LM13700" H 4350 1826 50  0000 C CNN
F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 4050 1575 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm13700.pdf" H 4050 1575 50  0001 C CNN
	1    4350 1550
	1    0    0    -1  
$EndComp
$Comp
L Amplifier_Operational:LM13700 U3
U 3 1 5FF0EB11
P 4350 5050
F 0 "U3" H 4350 5417 50  0000 C CNN
F 1 "LM13700" H 4350 5326 50  0000 C CNN
F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 4050 5075 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm13700.pdf" H 4050 5075 50  0001 C CNN
	3    4350 5050
	1    0    0    -1  
$EndComp
$Comp
L Amplifier_Operational:LM13700 U3
U 2 1 5FF0F002
P 10250 1100
F 0 "U3" H 10150 1450 50  0000 C CNN
F 1 "LM13700" H 10150 1350 50  0000 C CNN
F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 9950 1125 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm13700.pdf" H 9950 1125 50  0001 C CNN
	2    10250 1100
	1    0    0    -1  
$EndComp
$Comp
L Amplifier_Operational:LM13700 U3
U 4 1 5FF0F602
P 10800 1100
F 0 "U3" H 10700 1448 50  0000 C CNN
F 1 "LM13700" H 10700 1357 50  0000 C CNN
F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 10500 1125 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm13700.pdf" H 10500 1125 50  0001 C CNN
	4    10800 1100
	1    0    0    -1  
$EndComp
$Comp
L Amplifier_Operational:LM13700 U3
U 5 1 5FF10492
P 9750 3550
F 0 "U3" H 9708 3596 50  0000 L CNN
F 1 "LM13700" H 9708 3505 50  0000 L CNN
F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 9450 3575 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm13700.pdf" H 9450 3575 50  0001 C CNN
	5    9750 3550
	1    0    0    -1  
$EndComp
$Comp
L Device:R R13
U 1 1 5FF168F2
P 3700 1050
F 0 "R13" H 3630 1004 50  0000 R CNN
F 1 "11k" H 3630 1095 50  0000 R CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3630 1050 50  0001 C CNN
F 3 "~" H 3700 1050 50  0001 C CNN
	1    3700 1050
	-1   0    0    1   
$EndComp
$Comp
L Device:C C9
U 1 1 5FF1784B
P 9150 3550
F 0 "C9" H 9265 3596 50  0000 L CNN
F 1 "0.1u" H 9265 3505 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 9188 3400 50  0001 C CNN
F 3 "~" H 9150 3550 50  0001 C CNN
	1    9150 3550
	1    0    0    -1  
$EndComp
Wire Wire Line
	9150 3400 9150 3250
Wire Wire Line
	9150 3250 9400 3250
Wire Wire Line
	9150 3700 9150 3850
Wire Wire Line
	9150 3850 9400 3850
$Comp
L power:+12V #PWR019
U 1 1 5FF197AC
P 3700 800
F 0 "#PWR019" H 3700 650 50  0001 C CNN
F 1 "+12V" H 3715 973 50  0000 C CNN
F 2 "" H 3700 800 50  0001 C CNN
F 3 "" H 3700 800 50  0001 C CNN
	1    3700 800 
	1    0    0    -1  
$EndComp
$Comp
L power:-12V #PWR030
U 1 1 5FF19F68
P 9400 3850
F 0 "#PWR030" H 9400 3950 50  0001 C CNN
F 1 "-12V" H 9415 4023 50  0000 C CNN
F 2 "" H 9400 3850 50  0001 C CNN
F 3 "" H 9400 3850 50  0001 C CNN
	1    9400 3850
	-1   0    0    1   
$EndComp
$Comp
L power:GND #PWR017
U 1 1 5FF1A3A4
P 3050 1800
F 0 "#PWR017" H 3050 1550 50  0001 C CNN
F 1 "GND" H 3055 1627 50  0000 C CNN
F 2 "" H 3050 1800 50  0001 C CNN
F 3 "" H 3050 1800 50  0001 C CNN
	1    3050 1800
	1    0    0    -1  
$EndComp
Wire Wire Line
	3700 900  3700 800 
Wire Wire Line
	3700 1200 3700 1550
Wire Wire Line
	3700 1550 4050 1550
$Comp
L Device:R R9
U 1 1 5FF1C4D8
P 3400 1450
F 0 "R9" V 3193 1450 50  0000 C CNN
F 1 "510R" V 3284 1450 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3330 1450 50  0001 C CNN
F 3 "~" H 3400 1450 50  0001 C CNN
	1    3400 1450
	0    1    1    0   
$EndComp
$Comp
L Device:R R10
U 1 1 5FF1D173
P 3400 1650
F 0 "R10" V 3500 1650 50  0000 C CNN
F 1 "510R" V 3600 1650 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3330 1650 50  0001 C CNN
F 3 "~" H 3400 1650 50  0001 C CNN
	1    3400 1650
	0    1    1    0   
$EndComp
Wire Wire Line
	3550 1450 4050 1450
Wire Wire Line
	3250 1650 3050 1650
Wire Wire Line
	3050 1650 3050 1450
Wire Wire Line
	3050 1450 3250 1450
Wire Wire Line
	3050 1800 3050 1650
Connection ~ 3050 1650
Connection ~ 9400 3850
Wire Wire Line
	9400 3850 9650 3850
$Comp
L power:+12V #PWR029
U 1 1 5FF20699
P 9400 3250
F 0 "#PWR029" H 9400 3100 50  0001 C CNN
F 1 "+12V" H 9415 3423 50  0000 C CNN
F 2 "" H 9400 3250 50  0001 C CNN
F 3 "" H 9400 3250 50  0001 C CNN
	1    9400 3250
	1    0    0    -1  
$EndComp
Connection ~ 9400 3250
Wire Wire Line
	9400 3250 9650 3250
Text HLabel 1950 1450 0    50   Input ~ 0
V_SIG_IN_1
$Comp
L Device:R R5
U 1 1 5FF21944
P 2800 1450
F 0 "R5" V 2900 1450 50  0000 C CNN
F 1 "300k" V 3000 1450 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2730 1450 50  0001 C CNN
F 3 "~" H 2800 1450 50  0001 C CNN
	1    2800 1450
	0    1    1    0   
$EndComp
Wire Wire Line
	1950 1450 2250 1450
Text HLabel 6550 1650 2    50   Output ~ 0
V_SIG_OUT_1
Text HLabel 1800 3300 0    50   Input ~ 0
CV_1
Text HLabel 1950 4950 0    50   Input ~ 0
V_SIG_IN_2
Text HLabel 6550 5150 2    50   Output ~ 0
V_SIG_OUT_2
Text HLabel 1800 6800 0    50   Input ~ 0
CV_2
$Comp
L Amplifier_Operational:TL082 U1
U 1 1 60007691
P 2900 3400
F 0 "U1" H 3000 3150 50  0000 C CNN
F 1 "TL082" H 3050 3250 50  0000 C CNN
F 2 "Package_SO:TSSOP-8_4.4x3mm_P0.65mm" H 2900 3400 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl081.pdf" H 2900 3400 50  0001 C CNN
	1    2900 3400
	1    0    0    1   
$EndComp
$Comp
L Amplifier_Operational:TL082 U1
U 2 1 6000962D
P 5350 1650
F 0 "U1" H 5350 1283 50  0000 C CNN
F 1 "TL082" H 5350 1374 50  0000 C CNN
F 2 "Package_SO:TSSOP-8_4.4x3mm_P0.65mm" H 5350 1650 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl081.pdf" H 5350 1650 50  0001 C CNN
	2    5350 1650
	1    0    0    1   
$EndComp
$Comp
L Amplifier_Operational:TL082 U2
U 3 1 6000BB57
P 8700 3550
F 0 "U2" H 8658 3596 50  0000 L CNN
F 1 "TL082" H 8658 3505 50  0000 L CNN
F 2 "Package_SO:TSSOP-8_4.4x3mm_P0.65mm" H 8700 3550 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl081.pdf" H 8700 3550 50  0001 C CNN
	3    8700 3550
	1    0    0    -1  
$EndComp
Wire Wire Line
	3550 1650 4050 1650
$Comp
L Device:C C3
U 1 1 60010066
P 2400 1450
F 0 "C3" V 2550 1400 50  0000 L CNN
F 1 "470n" V 2650 1400 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 2438 1300 50  0001 C CNN
F 3 "~" H 2400 1450 50  0001 C CNN
	1    2400 1450
	0    1    1    0   
$EndComp
Wire Wire Line
	2550 1450 2650 1450
Wire Wire Line
	2950 1450 3050 1450
Connection ~ 3050 1450
$Comp
L Device:R R19
U 1 1 6001E9C6
P 5350 1050
F 0 "R19" V 5143 1050 50  0000 C CNN
F 1 "18k" V 5234 1050 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5280 1050 50  0001 C CNN
F 3 "~" H 5350 1050 50  0001 C CNN
	1    5350 1050
	0    1    1    0   
$EndComp
Wire Wire Line
	5500 1050 5850 1050
Wire Wire Line
	5850 1050 5850 1650
Wire Wire Line
	5850 1650 5650 1650
Wire Wire Line
	5200 1050 4850 1050
Wire Wire Line
	4850 1050 4850 1550
Wire Wire Line
	4850 1550 4650 1550
Wire Wire Line
	4850 1550 5050 1550
Connection ~ 4850 1550
$Comp
L Device:R R21
U 1 1 60024A92
P 6200 1650
F 0 "R21" V 5993 1650 50  0000 C CNN
F 1 "1k" V 6084 1650 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 6130 1650 50  0001 C CNN
F 3 "~" H 6200 1650 50  0001 C CNN
	1    6200 1650
	0    1    1    0   
$EndComp
Wire Wire Line
	5850 1650 6050 1650
Connection ~ 5850 1650
Wire Wire Line
	6350 1650 6550 1650
$Comp
L power:GND #PWR023
U 1 1 60028999
P 5000 1800
F 0 "#PWR023" H 5000 1550 50  0001 C CNN
F 1 "GND" H 5005 1627 50  0000 C CNN
F 2 "" H 5000 1800 50  0001 C CNN
F 3 "" H 5000 1800 50  0001 C CNN
	1    5000 1800
	1    0    0    -1  
$EndComp
Wire Wire Line
	5000 1800 5000 1750
Wire Wire Line
	5000 1750 5050 1750
Wire Wire Line
	4650 1950 4650 1650
$Comp
L Transistor_BJT:BC856 Q1
U 1 1 6002E3DE
P 3550 3400
F 0 "Q1" H 3741 3354 50  0000 L CNN
F 1 "BC856" H 3741 3445 50  0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 3750 3325 50  0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/BC860-D.pdf" H 3550 3400 50  0001 L CNN
	1    3550 3400
	1    0    0    1   
$EndComp
Wire Wire Line
	3200 3400 3250 3400
$Comp
L Device:R R6
U 1 1 60036D6E
P 2800 2100
F 0 "R6" V 2593 2100 50  0000 C CNN
F 1 "100k" V 2684 2100 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2730 2100 50  0001 C CNN
F 3 "~" H 2800 2100 50  0001 C CNN
	1    2800 2100
	0    1    1    0   
$EndComp
$Comp
L Device:R R15
U 1 1 6003ACD8
P 3900 2900
F 0 "R15" V 3693 2900 50  0000 C CNN
F 1 "24.9k" V 3784 2900 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3830 2900 50  0001 C CNN
F 3 "~" H 3900 2900 50  0001 C CNN
	1    3900 2900
	0    1    1    0   
$EndComp
Wire Wire Line
	2450 3300 2600 3300
Wire Wire Line
	3650 2900 3650 3200
Wire Wire Line
	3650 2900 3750 2900
$Comp
L power:GND #PWR021
U 1 1 600413F2
P 4150 2950
F 0 "#PWR021" H 4150 2700 50  0001 C CNN
F 1 "GND" H 4155 2777 50  0000 C CNN
F 2 "" H 4150 2950 50  0001 C CNN
F 3 "" H 4150 2950 50  0001 C CNN
	1    4150 2950
	1    0    0    -1  
$EndComp
Wire Wire Line
	4150 2950 4150 2900
Wire Wire Line
	4150 2900 4050 2900
$Comp
L Diode:1N4148WS D?
U 1 1 60051393
P 2800 2450
AR Path="/5FFB63E2/60051393" Ref="D?"  Part="1" 
AR Path="/5FF0DFBC/60051393" Ref="D1"  Part="1" 
F 0 "D1" H 2800 2350 50  0000 L CNN
F 1 "1N4148WS" H 2600 2550 50  0000 L CNN
F 2 "Diode_SMD:D_SOD-323" H 2800 2275 50  0001 C CNN
F 3 "https://www.vishay.com/docs/85751/1n4148ws.pdf" H 2800 2450 50  0001 C CNN
	1    2800 2450
	1    0    0    -1  
$EndComp
Wire Wire Line
	3650 3600 3650 3700
$Comp
L Device:R R17
U 1 1 5FF304E8
P 4650 2100
F 0 "R17" H 4850 2050 50  0000 C CNN
F 1 "6k8" H 4850 2150 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4580 2100 50  0001 C CNN
F 3 "~" H 4650 2100 50  0001 C CNN
	1    4650 2100
	-1   0    0    1   
$EndComp
Wire Wire Line
	2650 2100 2450 2100
Wire Wire Line
	2450 2100 2450 2450
Wire Wire Line
	2950 2100 3650 2100
Wire Wire Line
	3650 2100 3650 2900
Connection ~ 3650 2900
$Comp
L Device:C C5
U 1 1 6008A530
P 2700 2700
F 0 "C5" V 2850 2650 50  0000 L CNN
F 1 "1n" V 2950 2650 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 2738 2550 50  0001 C CNN
F 3 "~" H 2700 2700 50  0001 C CNN
	1    2700 2700
	0    1    1    0   
$EndComp
Wire Wire Line
	2550 2700 2450 2700
Connection ~ 2450 2700
Wire Wire Line
	2450 2700 2450 3300
Wire Wire Line
	2650 2450 2450 2450
Connection ~ 2450 2450
Wire Wire Line
	2450 2450 2450 2700
Wire Wire Line
	2950 2450 3250 2450
Wire Wire Line
	3250 2450 3250 2700
Connection ~ 3250 3400
Wire Wire Line
	3250 3400 3350 3400
Wire Wire Line
	2850 2700 3250 2700
Connection ~ 3250 2700
Wire Wire Line
	3250 2700 3250 3400
Wire Wire Line
	3650 3700 4650 3700
Wire Wire Line
	4650 2250 4650 3700
$Comp
L Device:R R3
U 1 1 6009C5E5
P 2150 3300
F 0 "R3" V 1943 3300 50  0000 C CNN
F 1 "100k" V 2034 3300 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2080 3300 50  0001 C CNN
F 3 "~" H 2150 3300 50  0001 C CNN
	1    2150 3300
	0    1    1    0   
$EndComp
Wire Wire Line
	2300 3300 2450 3300
Connection ~ 2450 3300
Wire Wire Line
	1800 3300 2000 3300
$Comp
L power:GND #PWR015
U 1 1 600A3705
P 2500 3550
F 0 "#PWR015" H 2500 3300 50  0001 C CNN
F 1 "GND" H 2505 3377 50  0000 C CNN
F 2 "" H 2500 3550 50  0001 C CNN
F 3 "" H 2500 3550 50  0001 C CNN
	1    2500 3550
	1    0    0    -1  
$EndComp
Wire Wire Line
	2500 3550 2500 3500
Wire Wire Line
	2500 3500 2600 3500
$Comp
L Device:C C8
U 1 1 600A989B
P 8100 3550
F 0 "C8" H 8215 3596 50  0000 L CNN
F 1 "0.1u" H 8215 3505 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 8138 3400 50  0001 C CNN
F 3 "~" H 8100 3550 50  0001 C CNN
	1    8100 3550
	1    0    0    -1  
$EndComp
$Comp
L power:+12V #PWR027
U 1 1 600AA32F
P 8350 3250
F 0 "#PWR027" H 8350 3100 50  0001 C CNN
F 1 "+12V" H 8365 3423 50  0000 C CNN
F 2 "" H 8350 3250 50  0001 C CNN
F 3 "" H 8350 3250 50  0001 C CNN
	1    8350 3250
	1    0    0    -1  
$EndComp
$Comp
L power:-12V #PWR028
U 1 1 600AA86E
P 8350 3850
F 0 "#PWR028" H 8350 3950 50  0001 C CNN
F 1 "-12V" H 8365 4023 50  0000 C CNN
F 2 "" H 8350 3850 50  0001 C CNN
F 3 "" H 8350 3850 50  0001 C CNN
	1    8350 3850
	-1   0    0    1   
$EndComp
$Comp
L Device:R R14
U 1 1 600E3247
P 3700 4550
F 0 "R14" H 3630 4504 50  0000 R CNN
F 1 "11k" H 3630 4595 50  0000 R CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3630 4550 50  0001 C CNN
F 3 "~" H 3700 4550 50  0001 C CNN
	1    3700 4550
	-1   0    0    1   
$EndComp
$Comp
L power:+12V #PWR020
U 1 1 600E324D
P 3700 4300
F 0 "#PWR020" H 3700 4150 50  0001 C CNN
F 1 "+12V" H 3715 4473 50  0000 C CNN
F 2 "" H 3700 4300 50  0001 C CNN
F 3 "" H 3700 4300 50  0001 C CNN
	1    3700 4300
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR018
U 1 1 600E3253
P 3050 5300
F 0 "#PWR018" H 3050 5050 50  0001 C CNN
F 1 "GND" H 3055 5127 50  0000 C CNN
F 2 "" H 3050 5300 50  0001 C CNN
F 3 "" H 3050 5300 50  0001 C CNN
	1    3050 5300
	1    0    0    -1  
$EndComp
Wire Wire Line
	3700 4400 3700 4300
Wire Wire Line
	3700 4700 3700 5050
Wire Wire Line
	3700 5050 4050 5050
$Comp
L Device:R R11
U 1 1 600E325C
P 3400 4950
F 0 "R11" V 3193 4950 50  0000 C CNN
F 1 "510R" V 3284 4950 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3330 4950 50  0001 C CNN
F 3 "~" H 3400 4950 50  0001 C CNN
	1    3400 4950
	0    1    1    0   
$EndComp
$Comp
L Device:R R12
U 1 1 600E3262
P 3400 5150
F 0 "R12" V 3500 5150 50  0000 C CNN
F 1 "510R" V 3600 5150 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3330 5150 50  0001 C CNN
F 3 "~" H 3400 5150 50  0001 C CNN
	1    3400 5150
	0    1    1    0   
$EndComp
Wire Wire Line
	3550 4950 4050 4950
Wire Wire Line
	3250 5150 3050 5150
Wire Wire Line
	3050 5150 3050 4950
Wire Wire Line
	3050 4950 3250 4950
Wire Wire Line
	3050 5300 3050 5150
Connection ~ 3050 5150
$Comp
L Device:R R7
U 1 1 600E326F
P 2800 4950
F 0 "R7" V 2900 4950 50  0000 C CNN
F 1 "300k" V 3000 4950 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2730 4950 50  0001 C CNN
F 3 "~" H 2800 4950 50  0001 C CNN
	1    2800 4950
	0    1    1    0   
$EndComp
Wire Wire Line
	1950 4950 2250 4950
$Comp
L Amplifier_Operational:TL082 U2
U 1 1 600E3278
P 2900 6900
F 0 "U2" H 3000 6650 50  0000 C CNN
F 1 "TL082" H 3050 6750 50  0000 C CNN
F 2 "Package_SO:TSSOP-8_4.4x3mm_P0.65mm" H 2900 6900 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl081.pdf" H 2900 6900 50  0001 C CNN
	1    2900 6900
	1    0    0    1   
$EndComp
$Comp
L Amplifier_Operational:TL082 U2
U 2 1 600E327E
P 5350 5150
F 0 "U2" H 5350 4783 50  0000 C CNN
F 1 "TL082" H 5350 4874 50  0000 C CNN
F 2 "Package_SO:TSSOP-8_4.4x3mm_P0.65mm" H 5350 5150 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl081.pdf" H 5350 5150 50  0001 C CNN
	2    5350 5150
	1    0    0    1   
$EndComp
$Comp
L Amplifier_Operational:TL082 U1
U 3 1 600E3284
P 7700 3550
F 0 "U1" H 7658 3596 50  0000 L CNN
F 1 "TL082" H 7658 3505 50  0000 L CNN
F 2 "Package_SO:TSSOP-8_4.4x3mm_P0.65mm" H 7700 3550 50  0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/tl081.pdf" H 7700 3550 50  0001 C CNN
	3    7700 3550
	1    0    0    -1  
$EndComp
Wire Wire Line
	3550 5150 4050 5150
$Comp
L Device:C C4
U 1 1 600E328B
P 2400 4950
F 0 "C4" V 2550 4900 50  0000 L CNN
F 1 "470n" V 2650 4900 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 2438 4800 50  0001 C CNN
F 3 "~" H 2400 4950 50  0001 C CNN
	1    2400 4950
	0    1    1    0   
$EndComp
Wire Wire Line
	2550 4950 2650 4950
Wire Wire Line
	2950 4950 3050 4950
Connection ~ 3050 4950
$Comp
L Device:R R20
U 1 1 600E3294
P 5350 4550
F 0 "R20" V 5143 4550 50  0000 C CNN
F 1 "18k" V 5234 4550 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 5280 4550 50  0001 C CNN
F 3 "~" H 5350 4550 50  0001 C CNN
	1    5350 4550
	0    1    1    0   
$EndComp
Wire Wire Line
	5500 4550 5850 4550
Wire Wire Line
	5850 4550 5850 5150
Wire Wire Line
	5850 5150 5650 5150
Wire Wire Line
	5200 4550 4850 4550
Wire Wire Line
	4850 4550 4850 5050
Wire Wire Line
	4850 5050 4650 5050
Wire Wire Line
	4850 5050 5050 5050
Connection ~ 4850 5050
$Comp
L Device:R R22
U 1 1 600E32A2
P 6200 5150
F 0 "R22" V 5993 5150 50  0000 C CNN
F 1 "1k" V 6084 5150 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 6130 5150 50  0001 C CNN
F 3 "~" H 6200 5150 50  0001 C CNN
	1    6200 5150
	0    1    1    0   
$EndComp
Wire Wire Line
	5850 5150 6050 5150
Connection ~ 5850 5150
Wire Wire Line
	6350 5150 6550 5150
$Comp
L power:GND #PWR024
U 1 1 600E32AB
P 5000 5300
F 0 "#PWR024" H 5000 5050 50  0001 C CNN
F 1 "GND" H 5005 5127 50  0000 C CNN
F 2 "" H 5000 5300 50  0001 C CNN
F 3 "" H 5000 5300 50  0001 C CNN
	1    5000 5300
	1    0    0    -1  
$EndComp
Wire Wire Line
	5000 5300 5000 5250
Wire Wire Line
	5000 5250 5050 5250
Wire Wire Line
	4650 5450 4650 5150
$Comp
L Transistor_BJT:BC856 Q2
U 1 1 600E32B4
P 3550 6900
F 0 "Q2" H 3741 6854 50  0000 L CNN
F 1 "BC856" H 3741 6945 50  0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-23" H 3750 6825 50  0001 L CIN
F 3 "https://www.onsemi.com/pub/Collateral/BC860-D.pdf" H 3550 6900 50  0001 L CNN
	1    3550 6900
	1    0    0    1   
$EndComp
Wire Wire Line
	3200 6900 3250 6900
$Comp
L Device:R R8
U 1 1 600E32BB
P 2800 5600
F 0 "R8" V 2593 5600 50  0000 C CNN
F 1 "100k" V 2684 5600 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2730 5600 50  0001 C CNN
F 3 "~" H 2800 5600 50  0001 C CNN
	1    2800 5600
	0    1    1    0   
$EndComp
$Comp
L Device:R R16
U 1 1 600E32C1
P 3900 6400
F 0 "R16" V 3693 6400 50  0000 C CNN
F 1 "24.9k" V 3784 6400 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 3830 6400 50  0001 C CNN
F 3 "~" H 3900 6400 50  0001 C CNN
	1    3900 6400
	0    1    1    0   
$EndComp
Wire Wire Line
	2450 6800 2600 6800
Wire Wire Line
	3650 6400 3650 6700
Wire Wire Line
	3650 6400 3750 6400
$Comp
L power:GND #PWR022
U 1 1 600E32CA
P 4150 6450
F 0 "#PWR022" H 4150 6200 50  0001 C CNN
F 1 "GND" H 4155 6277 50  0000 C CNN
F 2 "" H 4150 6450 50  0001 C CNN
F 3 "" H 4150 6450 50  0001 C CNN
	1    4150 6450
	1    0    0    -1  
$EndComp
Wire Wire Line
	4150 6450 4150 6400
Wire Wire Line
	4150 6400 4050 6400
$Comp
L Diode:1N4148WS D?
U 1 1 600E32D2
P 2800 5950
AR Path="/5FFB63E2/600E32D2" Ref="D?"  Part="1" 
AR Path="/5FF0DFBC/600E32D2" Ref="D2"  Part="1" 
F 0 "D2" H 2800 5850 50  0000 L CNN
F 1 "1N4148WS" H 2600 6050 50  0000 L CNN
F 2 "Diode_SMD:D_SOD-323" H 2800 5775 50  0001 C CNN
F 3 "https://www.vishay.com/docs/85751/1n4148ws.pdf" H 2800 5950 50  0001 C CNN
	1    2800 5950
	1    0    0    -1  
$EndComp
Wire Wire Line
	3650 7100 3650 7200
$Comp
L Device:R R18
U 1 1 600E32D9
P 4650 5600
F 0 "R18" H 4850 5550 50  0000 C CNN
F 1 "6k8" H 4850 5650 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 4580 5600 50  0001 C CNN
F 3 "~" H 4650 5600 50  0001 C CNN
	1    4650 5600
	-1   0    0    1   
$EndComp
Wire Wire Line
	2650 5600 2450 5600
Wire Wire Line
	2450 5600 2450 5950
Wire Wire Line
	2950 5600 3650 5600
Wire Wire Line
	3650 5600 3650 6400
Connection ~ 3650 6400
$Comp
L Device:C C6
U 1 1 600E32E4
P 2700 6200
F 0 "C6" V 2850 6150 50  0000 L CNN
F 1 "1n" V 2950 6150 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 2738 6050 50  0001 C CNN
F 3 "~" H 2700 6200 50  0001 C CNN
	1    2700 6200
	0    1    1    0   
$EndComp
Wire Wire Line
	2550 6200 2450 6200
Connection ~ 2450 6200
Wire Wire Line
	2450 6200 2450 6800
Wire Wire Line
	2650 5950 2450 5950
Connection ~ 2450 5950
Wire Wire Line
	2450 5950 2450 6200
Wire Wire Line
	2950 5950 3250 5950
Wire Wire Line
	3250 5950 3250 6200
Connection ~ 3250 6900
Wire Wire Line
	3250 6900 3350 6900
Wire Wire Line
	2850 6200 3250 6200
Connection ~ 3250 6200
Wire Wire Line
	3250 6200 3250 6900
Wire Wire Line
	3650 7200 4650 7200
Wire Wire Line
	4650 5750 4650 7200
$Comp
L Device:R R4
U 1 1 600E32F9
P 2150 6800
F 0 "R4" V 1943 6800 50  0000 C CNN
F 1 "100k" V 2034 6800 50  0000 C CNN
F 2 "Resistor_SMD:R_0603_1608Metric" V 2080 6800 50  0001 C CNN
F 3 "~" H 2150 6800 50  0001 C CNN
	1    2150 6800
	0    1    1    0   
$EndComp
Wire Wire Line
	2300 6800 2450 6800
Connection ~ 2450 6800
Wire Wire Line
	1800 6800 2000 6800
$Comp
L power:GND #PWR016
U 1 1 600E3302
P 2500 7050
F 0 "#PWR016" H 2500 6800 50  0001 C CNN
F 1 "GND" H 2505 6877 50  0000 C CNN
F 2 "" H 2500 7050 50  0001 C CNN
F 3 "" H 2500 7050 50  0001 C CNN
	1    2500 7050
	1    0    0    -1  
$EndComp
Wire Wire Line
	2500 7050 2500 7000
Wire Wire Line
	2500 7000 2600 7000
$Comp
L Device:C C7
U 1 1 600E330A
P 7100 3550
F 0 "C7" H 7215 3596 50  0000 L CNN
F 1 "0.1u" H 7215 3505 50  0000 L CNN
F 2 "Capacitor_SMD:C_0603_1608Metric" H 7138 3400 50  0001 C CNN
F 3 "~" H 7100 3550 50  0001 C CNN
	1    7100 3550
	1    0    0    -1  
$EndComp
$Comp
L power:+12V #PWR025
U 1 1 600E3310
P 7350 3250
F 0 "#PWR025" H 7350 3100 50  0001 C CNN
F 1 "+12V" H 7365 3423 50  0000 C CNN
F 2 "" H 7350 3250 50  0001 C CNN
F 3 "" H 7350 3250 50  0001 C CNN
	1    7350 3250
	1    0    0    -1  
$EndComp
$Comp
L power:-12V #PWR026
U 1 1 600E3316
P 7350 3850
F 0 "#PWR026" H 7350 3950 50  0001 C CNN
F 1 "-12V" H 7365 4023 50  0000 C CNN
F 2 "" H 7350 3850 50  0001 C CNN
F 3 "" H 7350 3850 50  0001 C CNN
	1    7350 3850
	-1   0    0    1   
$EndComp
Connection ~ 8350 3250
Connection ~ 8350 3850
Wire Wire Line
	8350 3850 8600 3850
Wire Wire Line
	8350 3250 8600 3250
Wire Wire Line
	8100 3250 8100 3400
Wire Wire Line
	8100 3250 8350 3250
Wire Wire Line
	8100 3700 8100 3850
Wire Wire Line
	8100 3850 8350 3850
Wire Wire Line
	7600 3250 7350 3250
Wire Wire Line
	7100 3250 7100 3400
Connection ~ 7350 3250
Wire Wire Line
	7350 3250 7100 3250
Wire Wire Line
	7600 3850 7350 3850
Wire Wire Line
	7100 3850 7100 3700
Connection ~ 7350 3850
Wire Wire Line
	7350 3850 7100 3850
$EndSCHEMATC