EESchema Schematic File Version 2
LIBS:adc-dac
LIBS:memory
LIBS:xilinx
LIBS:microcontrollers
LIBS:dsp
LIBS:microchip
LIBS:analog_switches
LIBS:motorola
LIBS:texas
LIBS:intel
LIBS:audio
LIBS:interface
LIBS:digital-audio
LIBS:philips
LIBS:display
LIBS:cypress
LIBS:siliconi
LIBS:opto
LIBS:atmel
LIBS:contrib
LIBS:power
LIBS:eSim_Plot
LIBS:transistors
LIBS:conn
LIBS:eSim_User
LIBS:regul
LIBS:74xx
LIBS:cmos4000
LIBS:eSim_Analog
LIBS:eSim_Devices
LIBS:eSim_Digital
LIBS:eSim_Hybrid
LIBS:eSim_Miscellaneous
LIBS:eSim_Power
LIBS:eSim_Sources
LIBS:eSim_Subckt
LIBS:eSim_Nghdl
LIBS:eSim_Ngveri
LIBS:eSim_SKY130
LIBS:eSim_SKY130_Subckts
LIBS:LM341-cache
EELAYER 25 0
EELAYER END
$Descr User 17000 15748
encoding utf-8
Sheet 1 1
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L resistor R1
U 1 1 666AF137
P 2750 5650
F 0 "R1" H 2800 5780 50  0000 C CNN
F 1 "80k" H 2800 5600 50  0000 C CNN
F 2 "" H 2800 5630 30  0000 C CNN
F 3 "" V 2800 5700 30  0000 C CNN
	1    2750 5650
	0    -1   -1   0   
$EndComp
$Comp
L eSim_NPN Q1
U 1 1 666AF138
P 3200 6500
F 0 "Q1" H 3100 6550 50  0000 R CNN
F 1 "eSim_NPN" H 3150 6650 50  0000 R CNN
F 2 "" H 3400 6600 29  0000 C CNN
F 3 "" H 3200 6500 60  0000 C CNN
	1    3200 6500
	1    0    0    -1  
$EndComp
$Comp
L resistor R2
U 1 1 666AF139
P 3350 8350
F 0 "R2" H 3400 8480 50  0000 C CNN
F 1 "7k" H 3400 8300 50  0000 C CNN
F 2 "" H 3400 8330 30  0000 C CNN
F 3 "" V 3400 8400 30  0000 C CNN
	1    3350 8350
	0    -1   -1   0   
$EndComp
$Comp
L resistor R3
U 1 1 666AF13A
P 3350 10450
F 0 "R3" H 3400 10580 50  0000 C CNN
F 1 "4.97k" H 3400 10400 50  0000 C CNN
F 2 "" H 3400 10430 30  0000 C CNN
F 3 "" V 3400 10500 30  0000 C CNN
	1    3350 10450
	0    -1   -1   0   
$EndComp
$Comp
L resistor R4
U 1 1 666AF13B
P 3350 12200
F 0 "R4" H 3400 12330 50  0000 C CNN
F 1 "830" H 3400 12150 50  0000 C CNN
F 2 "" H 3400 12180 30  0000 C CNN
F 3 "" V 3400 12250 30  0000 C CNN
	1    3350 12200
	0    -1   -1   0   
$EndComp
$Comp
L resistor R6
U 1 1 666AF13C
P 5950 12200
F 0 "R6" H 6000 12330 50  0000 C CNN
F 1 "1.2k" H 6000 12150 50  0000 C CNN
F 2 "" H 6000 12180 30  0000 C CNN
F 3 "" V 6000 12250 30  0000 C CNN
	1    5950 12200
	0    -1   -1   0   
$EndComp
$Comp
L resistor R9
U 1 1 666AF13D
P 7950 12200
F 0 "R9" H 8000 12330 50  0000 C CNN
F 1 "12.1k" H 8000 12150 50  0000 C CNN
F 2 "" H 8000 12180 30  0000 C CNN
F 3 "" V 8000 12250 30  0000 C CNN
	1    7950 12200
	0    -1   -1   0   
$EndComp
$Comp
L resistor R12
U 1 1 666AF13E
P 8850 12200
F 0 "R12" H 8900 12330 50  0000 C CNN
F 1 "1k" H 8900 12150 50  0000 C CNN
F 2 "" H 8900 12180 30  0000 C CNN
F 3 "" V 8900 12250 30  0000 C CNN
	1    8850 12200
	0    -1   -1   0   
$EndComp
$Comp
L resistor R15
U 1 1 666AF13F
P 9750 12200
F 0 "R15" H 9800 12330 50  0000 C CNN
F 1 "4k" H 9800 12150 50  0000 C CNN
F 2 "" H 9800 12180 30  0000 C CNN
F 3 "" V 9800 12250 30  0000 C CNN
	1    9750 12200
	0    -1   -1   0   
$EndComp
$Comp
L eSim_NPN Q2
U 1 1 666AF140
P 3900 11650
F 0 "Q2" H 3800 11700 50  0000 R CNN
F 1 "eSim_NPN" H 3850 11800 50  0000 R CNN
F 2 "" H 4100 11750 29  0000 C CNN
F 3 "" H 3900 11650 60  0000 C CNN
	1    3900 11650
	1    0    0    -1  
$EndComp
$Comp
L eSim_NPN Q9
U 1 1 666AF141
P 6400 11650
F 0 "Q9" H 6300 11700 50  0000 R CNN
F 1 "eSim_NPN" H 6350 11800 50  0000 R CNN
F 2 "" H 6600 11750 29  0000 C CNN
F 3 "" H 6400 11650 60  0000 C CNN
	1    6400 11650
	1    0    0    -1  
$EndComp
$Comp
L eSim_NPN Q10
U 1 1 666AF142
P 7800 11150
F 0 "Q10" H 7700 11200 50  0000 R CNN
F 1 "eSim_NPN" H 7750 11300 50  0000 R CNN
F 2 "" H 8000 11250 29  0000 C CNN
F 3 "" H 7800 11150 60  0000 C CNN
	1    7800 11150
	1    0    0    -1  
$EndComp
$Comp
L eSim_NPN Q11
U 1 1 666AF143
P 8700 11650
F 0 "Q11" H 8600 11700 50  0000 R CNN
F 1 "eSim_NPN" H 8650 11800 50  0000 R CNN
F 2 "" H 8900 11750 29  0000 C CNN
F 3 "" H 8700 11650 60  0000 C CNN
	1    8700 11650
	1    0    0    -1  
$EndComp
$Comp
L eSim_NPN Q15
U 1 1 666AF144
P 9800 11650
F 0 "Q15" H 9700 11700 50  0000 R CNN
F 1 "eSim_NPN" H 9750 11800 50  0000 R CNN
F 2 "" H 10000 11750 29  0000 C CNN
F 3 "" H 9800 11650 60  0000 C CNN
	1    9800 11650
	-1   0    0    -1  
$EndComp
$Comp
L capacitor C1
U 1 1 666AF145
P 6150 11150
F 0 "C1" H 6175 11250 50  0000 L CNN
F 1 "4pF" H 6175 11050 50  0000 L CNN
F 2 "" H 6188 11000 30  0000 C CNN
F 3 "" H 6150 11150 60  0000 C CNN
	1    6150 11150
	0    -1   -1   0   
$EndComp
$Comp
L eSim_NPN Q7
U 1 1 666AF146
P 6000 10400
F 0 "Q7" H 5900 10450 50  0000 R CNN
F 1 "eSim_NPN" H 5950 10550 50  0000 R CNN
F 2 "" H 6200 10500 29  0000 C CNN
F 3 "" H 6000 10400 60  0000 C CNN
	1    6000 10400
	-1   0    0    -1  
$EndComp
$Comp
L eSim_NPN Q14
U 1 1 666AF147
P 9600 10400
F 0 "Q14" H 9500 10450 50  0000 R CNN
F 1 "eSim_NPN" H 9550 10550 50  0000 R CNN
F 2 "" H 9800 10500 29  0000 C CNN
F 3 "" H 9600 10400 60  0000 C CNN
	1    9600 10400
	1    0    0    -1  
$EndComp
$Comp
L eSim_NPN Q16
U 1 1 666AF148
P 10300 10800
F 0 "Q16" H 10200 10850 50  0000 R CNN
F 1 "eSim_NPN" H 10250 10950 50  0000 R CNN
F 2 "" H 10500 10900 29  0000 C CNN
F 3 "" H 10300 10800 60  0000 C CNN
	1    10300 10800
	1    0    0    -1  
$EndComp
$Comp
L capacitor C2
U 1 1 666AF149
P 9250 10000
F 0 "C2" H 9275 10100 50  0000 L CNN
F 1 "20pF" H 9275 9900 50  0000 L CNN
F 2 "" H 9288 9850 30  0000 C CNN
F 3 "" H 9250 10000 60  0000 C CNN
	1    9250 10000
	0    -1   -1   0   
$EndComp
$Comp
L resistor R8
U 1 1 666AF14A
P 6550 10850
F 0 "R8" H 6600 10980 50  0000 C CNN
F 1 "26" H 6600 10800 50  0000 C CNN
F 2 "" H 6600 10830 30  0000 C CNN
F 3 "" V 6600 10900 30  0000 C CNN
	1    6550 10850
	0    -1   -1   0   
$EndComp
$Comp
L resistor R7
U 1 1 666AF14B
P 6550 10000
F 0 "R7" H 6600 10130 50  0000 C CNN
F 1 "1.9k" H 6600 9950 50  0000 C CNN
F 2 "" H 6600 9980 30  0000 C CNN
F 3 "" V 6600 10050 30  0000 C CNN
	1    6550 10000
	0    -1   -1   0   
$EndComp
$Comp
L resistor R11
U 1 1 666AF14C
P 8850 9700
F 0 "R11" H 8900 9830 50  0000 C CNN
F 1 "16.5k" H 8900 9650 50  0000 C CNN
F 2 "" H 8900 9680 30  0000 C CNN
F 3 "" V 8900 9750 30  0000 C CNN
	1    8850 9700
	0    -1   -1   0   
$EndComp
$Comp
L eSim_PNP Q18
U 1 1 666AF14D
P 10900 10000
F 0 "Q18" H 10800 10050 50  0000 R CNN
F 1 "eSim_PNP" H 10850 10150 50  0000 R CNN
F 2 "" H 11100 10100 29  0000 C CNN
F 3 "" H 10900 10000 60  0000 C CNN
	1    10900 10000
	1    0    0    1   
$EndComp
$Comp
L resistor R17
U 1 1 666AF14E
P 10450 9700
F 0 "R17" H 10500 9830 50  0000 C CNN
F 1 "4k" H 10500 9650 50  0000 C CNN
F 2 "" H 10500 9680 30  0000 C CNN
F 3 "" V 10500 9750 30  0000 C CNN
	1    10450 9700
	0    -1   -1   0   
$EndComp
$Comp
L resistor R16
U 1 1 666AF14F
P 10450 9050
F 0 "R16" H 10500 9180 50  0000 C CNN
F 1 "850" H 10500 9000 50  0000 C CNN
F 2 "" H 10500 9030 30  0000 C CNN
F 3 "" V 10500 9100 30  0000 C CNN
	1    10450 9050
	0    -1   -1   0   
$EndComp
$Comp
L resistor R21
U 1 1 666AF150
P 12000 10550
F 0 "R21" H 12050 10680 50  0000 C CNN
F 1 "2.67k" H 12050 10500 50  0000 C CNN
F 2 "" H 12050 10530 30  0000 C CNN
F 3 "" V 12050 10600 30  0000 C CNN
	1    12000 10550
	0    -1   -1   0   
$EndComp
$Comp
L eSim_NPN Q13
U 1 1 666AF151
P 8900 8650
F 0 "Q13" H 8800 8700 50  0000 R CNN
F 1 "eSim_NPN" H 8850 8800 50  0000 R CNN
F 2 "" H 9100 8750 29  0000 C CNN
F 3 "" H 8900 8650 60  0000 C CNN
	1    8900 8650
	-1   0    0    -1  
$EndComp
$Comp
L eSim_NPN Q3
U 1 1 666AF152
P 5100 8650
F 0 "Q3" H 5000 8700 50  0000 R CNN
F 1 "eSim_NPN" H 5050 8800 50  0000 R CNN
F 2 "" H 5300 8750 29  0000 C CNN
F 3 "" H 5100 8650 60  0000 C CNN
	1    5100 8650
	1    0    0    -1  
$EndComp
$Comp
L eSim_NPN Q6
U 1 1 666AF153
P 6000 8650
F 0 "Q6" H 5900 8700 50  0000 R CNN
F 1 "eSim_NPN" H 5950 8800 50  0000 R CNN
F 2 "" H 6200 8750 29  0000 C CNN
F 3 "" H 6000 8650 60  0000 C CNN
	1    6000 8650
	-1   0    0    -1  
$EndComp
$Comp
L resistor R5
U 1 1 666AF154
P 5250 9250
F 0 "R5" H 5300 9380 50  0000 C CNN
F 1 "500" H 5300 9200 50  0000 C CNN
F 2 "" H 5300 9230 30  0000 C CNN
F 3 "" V 5300 9300 30  0000 C CNN
	1    5250 9250
	0    -1   -1   0   
$EndComp
$Comp
L eSim_NPN Q5
U 1 1 666AF155
P 5800 8050
F 0 "Q5" H 5700 8100 50  0000 R CNN
F 1 "eSim_NPN" H 5750 8200 50  0000 R CNN
F 2 "" H 6000 8150 29  0000 C CNN
F 3 "" H 5800 8050 60  0000 C CNN
	1    5800 8050
	1    0    0    -1  
$EndComp
$Comp
L resistor R20
U 1 1 666AF156
P 12000 8400
F 0 "R20" H 12050 8530 50  0000 C CNN
F 1 "1.43k" H 12050 8350 50  0000 C CNN
F 2 "" H 12050 8380 30  0000 C CNN
F 3 "" V 12050 8450 30  0000 C CNN
	1    12000 8400
	0    -1   -1   0   
$EndComp
$Comp
L resistor R19
U 1 1 666AF157
P 12000 7500
F 0 "R19" H 12050 7630 50  0000 C CNN
F 1 "0.25" H 12050 7450 50  0000 C CNN
F 2 "" H 12050 7480 30  0000 C CNN
F 3 "" V 12050 7550 30  0000 C CNN
	1    12000 7500
	0    -1   -1   0   
$EndComp
$Comp
L resistor R10
U 1 1 666AF158
P 8850 7500
F 0 "R10" H 8900 7630 50  0000 C CNN
F 1 "100" H 8900 7450 50  0000 C CNN
F 2 "" H 8900 7480 30  0000 C CNN
F 3 "" V 8900 7550 30  0000 C CNN
	1    8850 7500
	0    -1   -1   0   
$EndComp
$Comp
L resistor R18
U 1 1 666AF159
P 11150 6000
F 0 "R18" H 11200 6130 50  0000 C CNN
F 1 "1.62k" H 11200 5950 50  0000 C CNN
F 2 "" H 11200 5980 30  0000 C CNN
F 3 "" V 11200 6050 30  0000 C CNN
	1    11150 6000
	0    -1   -1   0   
$EndComp
$Comp
L eSim_NPN Q12
U 1 1 666AF15A
P 8900 6950
F 0 "Q12" H 8800 7000 50  0000 R CNN
F 1 "eSim_NPN" H 8850 7100 50  0000 R CNN
F 2 "" H 9100 7050 29  0000 C CNN
F 3 "" H 8900 6950 60  0000 C CNN
	1    8900 6950
	-1   0    0    -1  
$EndComp
$Comp
L resistor R14
U 1 1 666AF15B
P 9750 7000
F 0 "R14" H 9800 7130 50  0000 C CNN
F 1 "380" H 9800 6950 50  0000 C CNN
F 2 "" H 9800 6980 30  0000 C CNN
F 3 "" V 9800 7050 30  0000 C CNN
	1    9750 7000
	1    0    0    -1  
$EndComp
$Comp
L zener U3
U 1 1 666AF15C
P 9400 6350
F 0 "U3" H 9350 6250 60  0000 C CNN
F 1 "zener" H 9400 6450 60  0000 C CNN
F 2 "" H 9450 6350 60  0000 C CNN
F 3 "" H 9450 6350 60  0000 C CNN
	1    9400 6350
	0    1    -1   0   
$EndComp
$Comp
L resistor R13
U 1 1 666AF15D
P 9450 5750
F 0 "R13" H 9500 5880 50  0000 C CNN
F 1 "16k" H 9500 5700 50  0000 C CNN
F 2 "" H 9500 5730 30  0000 C CNN
F 3 "" V 9500 5800 30  0000 C CNN
	1    9450 5750
	0    -1   -1   0   
$EndComp
$Comp
L eSim_NPN Q19
U 1 1 666AF15E
P 11850 5300
F 0 "Q19" H 11750 5350 50  0000 R CNN
F 1 "eSim_NPN" H 11800 5450 50  0000 R CNN
F 2 "" H 12050 5400 29  0000 C CNN
F 3 "" H 11850 5300 60  0000 C CNN
	1    11850 5300
	1    0    0    -1  
$EndComp
$Comp
L eSim_NPN Q17
U 1 1 666AF15F
P 10700 5050
F 0 "Q17" H 10600 5100 50  0000 R CNN
F 1 "eSim_NPN" H 10650 5200 50  0000 R CNN
F 2 "" H 10900 5150 29  0000 C CNN
F 3 "" H 10700 5050 60  0000 C CNN
	1    10700 5050
	1    0    0    -1  
$EndComp
$Comp
L eSim_PNP Q4
U 1 1 666AF160
P 5650 4850
F 0 "Q4" H 5550 4900 50  0000 R CNN
F 1 "eSim_PNP" H 5600 5000 50  0000 R CNN
F 2 "" H 5850 4950 29  0000 C CNN
F 3 "" H 5650 4850 60  0000 C CNN
	1    5650 4850
	1    0    0    1   
$EndComp
$Comp
L eSim_PNP Q8
U 1 1 666AF161
P 6150 4850
F 0 "Q8" H 6050 4900 50  0000 R CNN
F 1 "eSim_PNP" H 6100 5000 50  0000 R CNN
F 2 "" H 6350 4950 29  0000 C CNN
F 3 "" H 6150 4850 60  0000 C CNN
	1    6150 4850
	1    0    0    1   
$EndComp
Wire Wire Line
	3300 12300 3300 12600
Wire Wire Line
	2700 12600 13050 12600
Wire Wire Line
	9700 12600 9700 12300
Wire Wire Line
	8800 12300 8800 12600
Connection ~ 8800 12600
Wire Wire Line
	7900 12300 7900 12600
Connection ~ 7900 12600
Wire Wire Line
	5900 12300 5900 12600
Connection ~ 5900 12600
Wire Wire Line
	9700 11850 9700 12000
Wire Wire Line
	8800 11850 8800 12000
Wire Wire Line
	7900 11350 7900 12000
Wire Wire Line
	5900 11650 6200 11650
Wire Wire Line
	5900 10600 5900 12000
Wire Wire Line
	6500 11850 6500 12600
Connection ~ 6500 12600
Wire Wire Line
	6300 11150 7600 11150
Wire Wire Line
	6500 10950 6500 11450
Connection ~ 6500 11150
Wire Wire Line
	6000 11150 5900 11150
Connection ~ 5900 11650
Wire Wire Line
	3700 11650 3300 11650
Wire Wire Line
	3300 10550 3300 12000
Wire Wire Line
	4000 11850 4000 12600
Connection ~ 4000 12600
Connection ~ 9700 12600
Wire Wire Line
	8500 11650 7900 11650
Connection ~ 7900 11650
Wire Wire Line
	8800 9800 8800 11450
Wire Wire Line
	6500 10100 6500 10650
Wire Wire Line
	6200 10400 6500 10400
Connection ~ 6500 10400
Connection ~ 5900 11150
Wire Wire Line
	5900 8850 5900 10200
Wire Wire Line
	5200 9600 6500 9600
Wire Wire Line
	6500 9600 6500 9800
Wire Wire Line
	7900 10950 7900 9300
Wire Wire Line
	7900 9300 8800 9300
Wire Wire Line
	8800 8850 8800 9500
Wire Wire Line
	9100 10000 8800 10000
Connection ~ 8800 10000
Wire Wire Line
	9400 10000 10700 10000
Wire Wire Line
	9700 10000 9700 10200
Wire Wire Line
	9400 10400 8800 10400
Connection ~ 8800 10400
Wire Wire Line
	9700 10600 9700 11450
Wire Wire Line
	10100 10800 9700 10800
Connection ~ 9700 10800
Wire Wire Line
	10400 11000 10400 12600
Connection ~ 10400 12600
Wire Wire Line
	10000 11650 10050 11650
Wire Wire Line
	10050 11650 10050 11200
Wire Wire Line
	10050 11200 9700 11200
Connection ~ 9700 11200
Wire Wire Line
	11000 10200 11000 12600
Connection ~ 11000 12600
Connection ~ 9700 10000
Wire Wire Line
	10400 9800 10400 10600
Connection ~ 10400 10000
Wire Wire Line
	10400 9150 10400 9500
Wire Wire Line
	10400 9350 11000 9350
Wire Wire Line
	11000 9350 11000 9800
Connection ~ 10400 9350
Wire Wire Line
	5200 9350 5200 9600
Connection ~ 5900 9600
Wire Wire Line
	5200 8850 5200 9050
Wire Wire Line
	5900 8250 5900 8450
Connection ~ 9100 8650
Connection ~ 8800 9300
Wire Wire Line
	5200 8450 5200 7650
Wire Wire Line
	5200 7650 5900 7650
Wire Wire Line
	5900 7450 5900 7850
Wire Wire Line
	5600 8050 3300 8050
Wire Wire Line
	3300 6700 3300 8150
Wire Wire Line
	4900 8650 3300 8650
Wire Wire Line
	3300 8450 3300 10250
Connection ~ 3300 8650
Connection ~ 3300 11650
Wire Wire Line
	11950 10650 11950 12600
Connection ~ 11950 12600
Wire Wire Line
	11950 8500 11950 10350
Wire Wire Line
	6200 8650 11950 8650
Connection ~ 3300 8050
Connection ~ 11950 8650
Wire Wire Line
	11950 7600 11950 8200
Wire Wire Line
	11950 5500 11950 7300
Wire Wire Line
	10800 5300 11650 5300
Wire Wire Line
	10800 5300 10800 5250
Wire Wire Line
	8800 8300 8800 8450
Wire Wire Line
	8800 8300 11550 8300
Wire Wire Line
	11550 8300 11550 5300
Connection ~ 11550 5300
Wire Wire Line
	11100 5800 11100 5300
Connection ~ 11100 5300
Wire Wire Line
	11100 6100 11100 6650
Wire Wire Line
	11100 6650 9400 6650
Wire Wire Line
	9400 6550 9400 6950
Wire Wire Line
	9100 6950 9650 6950
Connection ~ 9400 6650
Connection ~ 9400 6950
Wire Wire Line
	9950 6950 11950 6950
Connection ~ 11950 6950
Wire Wire Line
	9400 6050 9400 5850
Wire Wire Line
	10400 5050 10400 8850
Wire Wire Line
	6250 5050 10500 5050
Wire Wire Line
	8800 5050 8800 6750
Connection ~ 10400 5050
Wire Wire Line
	8800 7150 8800 7300
Wire Wire Line
	8800 7600 8800 7900
Connection ~ 11950 7900
Connection ~ 8800 5050
Wire Wire Line
	5750 5050 5750 7450
Wire Wire Line
	5750 7450 5900 7450
Connection ~ 5900 7650
Wire Wire Line
	5750 4650 6250 4650
Wire Wire Line
	6000 4450 6000 4650
Wire Wire Line
	2700 4450 12350 4450
Wire Wire Line
	10800 4450 10800 4850
Connection ~ 6000 4650
Wire Wire Line
	11950 4450 11950 5100
Connection ~ 10800 4450
Connection ~ 9400 4450
Wire Wire Line
	5250 4850 5950 4850
Wire Wire Line
	5250 4850 5250 5400
Wire Wire Line
	5250 5400 5750 5400
Connection ~ 5750 5400
Connection ~ 5450 4850
Wire Wire Line
	6500 6150 6500 5050
Wire Wire Line
	4000 6150 6500 6150
Wire Wire Line
	4000 6150 4000 11450
Connection ~ 6500 5050
Wire Wire Line
	3300 6300 3300 4450
Connection ~ 6000 4450
Wire Wire Line
	2700 4450 2700 5450
Connection ~ 3300 4450
Wire Wire Line
	2700 5750 2700 9000
Wire Wire Line
	2700 6500 3000 6500
$Comp
L zener U1
U 1 1 666AF162
P 2700 9300
F 0 "U1" H 2650 9200 60  0000 C CNN
F 1 "zener" H 2700 9400 60  0000 C CNN
F 2 "" H 2750 9300 60  0000 C CNN
F 3 "" H 2750 9300 60  0000 C CNN
	1    2700 9300
	0    1    -1   0   
$EndComp
Connection ~ 2700 6500
Wire Wire Line
	2700 9500 2700 12600
Connection ~ 3300 12600
Connection ~ 11950 4450
$Comp
L zener U2
U 1 1 666AF16B
P 9400 4800
F 0 "U2" H 9350 4700 60  0000 C CNN
F 1 "zener" H 9400 4900 60  0000 C CNN
F 2 "" H 9450 4800 60  0000 C CNN
F 3 "" H 9450 4800 60  0000 C CNN
	1    9400 4800
	0    1    -1   0   
$EndComp
Wire Wire Line
	9400 4500 9400 4450
Wire Wire Line
	9400 5000 9400 5550
Wire Wire Line
	8800 7900 12850 7900
$Comp
L PORT U4
U 3 1 666B2EC3
P 13100 7900
F 0 "U4" H 13150 8000 30  0000 C CNN
F 1 "PORT" H 13100 7900 30  0000 C CNN
F 2 "" H 13100 7900 60  0000 C CNN
F 3 "" H 13100 7900 60  0000 C CNN
	3    13100 7900
	-1   0    0    -1  
$EndComp
$Comp
L PORT U4
U 2 1 666B2F6C
P 13300 12600
F 0 "U4" H 13350 12700 30  0000 C CNN
F 1 "PORT" H 13300 12600 30  0000 C CNN
F 2 "" H 13300 12600 60  0000 C CNN
F 3 "" H 13300 12600 60  0000 C CNN
	2    13300 12600
	-1   0    0    -1  
$EndComp
$Comp
L PORT U4
U 1 1 666B3005
P 12600 4450
F 0 "U4" H 12650 4550 30  0000 C CNN
F 1 "PORT" H 12600 4450 30  0000 C CNN
F 2 "" H 12600 4450 60  0000 C CNN
F 3 "" H 12600 4450 60  0000 C CNN
	1    12600 4450
	-1   0    0    -1  
$EndComp
$EndSCHEMATC