Makeshift Neural Interface https://psylink.me
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16 KiB

EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
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Title ""
Date ""
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L Device:R R1
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F 0 "R1" H 1220 3396 50 0001 L CNN
F 1 "560k/5%" V 1220 3350 50 0000 C TNN
F 2 "" V 1080 3350 50 0001 C CNN
F 3 "~" H 1150 3350 50 0001 C CNN
1 1150 3350
0 1 1 0
$EndComp
$Comp
L Amplifier_Operational:LM324 U?
U 5 1 60856203
P 2200 3450
F 0 "U?" H 2158 3496 50 0001 L CNN
F 1 "LM324" H 2158 3405 50 0001 L CNN
F 2 "" H 2150 3550 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 2250 3650 50 0001 C CNN
5 2200 3450
1 0 0 -1
$EndComp
$Comp
L MCU_Module:Arduino_Nano_v3.x A?
U 1 1 60849281
P 4350 2900
F 0 "A?" H 4350 1811 50 0001 C CNN
F 1 "Arduino_Nano_v3.x" H 4350 1720 50 0001 C CNN
F 2 "Module:Arduino_Nano" H 4350 2900 50 0001 C CIN
F 3 "http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf" H 4350 2900 50 0001 C CNN
1 4350 2900
-1 0 0 1
$EndComp
$Comp
L Device:R R?
U 1 1 60853C24
P 1450 3500
F 0 "R?" H 1520 3546 50 0001 L CNN
F 1 "560k/5%" H 1520 3500 50 0000 L CNN
F 2 "" V 1380 3500 50 0001 C CNN
F 3 "~" H 1450 3500 50 0001 C CNN
1 1450 3500
1 0 0 -1
$EndComp
$Comp
L power:+5V #PWR?
U 1 1 6086178C
P 3700 3800
F 0 "#PWR?" H 3700 3650 50 0001 C CNN
F 1 "+5V" H 3715 3973 50 0000 C CNN
F 2 "" H 3700 3800 50 0001 C CNN
F 3 "" H 3700 3800 50 0001 C CNN
1 3700 3800
1 0 0 -1
$EndComp
$Comp
L power:+5V #PWR?
U 1 1 60862309
P 2100 3150
F 0 "#PWR?" H 2100 3000 50 0001 C CNN
F 1 "+5V" H 2115 3323 50 0000 C TNN
F 2 "" H 2100 3150 50 0001 C CNN
F 3 "" H 2100 3150 50 0001 C CNN
1 2100 3150
1 0 0 -1
$EndComp
Connection ~ 1450 3350
$Comp
L power:+5V #PWR?
U 1 1 6086442E
P 1000 3350
F 0 "#PWR?" H 1000 3200 50 0001 C CNN
F 1 "+5V" H 1015 3523 50 0000 C CNN
F 2 "" H 1000 3350 50 0001 C CNN
F 3 "" H 1000 3350 50 0001 C CNN
1 1000 3350
0 -1 -1 0
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 60864F96
P 1450 3650
F 0 "#PWR?" H 1450 3400 50 0001 C CNN
F 1 "Earth" H 1450 3500 50 0001 C CNN
F 2 "" H 1450 3650 50 0001 C CNN
F 3 "~" H 1450 3650 50 0001 C CNN
1 1450 3650
1 0 0 -1
$EndComp
$Comp
L Device:CP C?
U 1 1 6086BD5C
P 2700 4050
F 0 "C?" H 2815 4096 50 0001 L CNN
F 1 "220uF" V 2818 4050 50 0000 C TNN
F 2 "" H 2738 3900 50 0001 C CNN
F 3 "~" H 2700 4050 50 0001 C CNN
1 2700 4050
1 0 0 -1
$EndComp
$Comp
L Device:C C?
U 1 1 6086D8F2
P 2100 4050
F 0 "C?" H 2215 4096 50 0001 L CNN
F 1 "47nF" V 2215 4050 50 0000 C TNN
F 2 "" H 2138 3900 50 0001 C CNN
F 3 "~" H 2100 4050 50 0001 C CNN
1 2100 4050
1 0 0 -1
$EndComp
$Comp
L Device:C C?
U 1 1 6086DC96
P 1800 4050
F 0 "C?" H 1915 4096 50 0001 L CNN
F 1 "100pF" V 1915 4050 50 0000 C TNN
F 2 "" H 1838 3900 50 0001 C CNN
F 3 "~" H 1800 4050 50 0001 C CNN
1 1800 4050
1 0 0 -1
$EndComp
$Comp
L Device:C C?
U 1 1 6086B37B
P 2400 4050
F 0 "C?" H 2515 4096 50 0001 L CNN
F 1 "220nF" V 2515 4050 50 0000 C TNN
F 2 "" H 2438 3900 50 0001 C CNN
F 3 "~" H 2400 4050 50 0001 C CNN
1 2400 4050
1 0 0 -1
$EndComp
Wire Wire Line
2700 3450 2900 3450
$Comp
L Device:R R?
U 1 1 608772AE
P 3050 3450
F 0 "R?" V 2843 3450 50 0001 C CNN
F 1 "100k/5%" V 2935 3450 50 0000 C CNN
F 2 "" V 2980 3450 50 0001 C CNN
F 3 "~" H 3050 3450 50 0001 C CNN
1 3050 3450
0 1 1 0
$EndComp
$Comp
L Connector:Conn_01x01_Female J?
U 1 1 6088CF1C
P 3350 3650
F 0 "J?" H 3378 3676 50 0001 L CNN
F 1 "Electrode GND" H 3378 3630 50 0000 L CNN
F 2 "" H 3350 3650 50 0001 C CNN
F 3 "~" H 3350 3650 50 0001 C CNN
1 3350 3650
0 1 1 0
$EndComp
Wire Wire Line
2500 3450 2700 3450
Wire Wire Line
2700 3450 2700 3650
Connection ~ 2700 3450
Wire Wire Line
3000 3650 2700 3650
$Comp
L Connector:Conn_01x01_Female J?
U 1 1 6093A7BF
P 1150 2600
F 0 "J?" H 1178 2626 50 0001 L CNN
F 1 "Electrode 2" H 1178 2580 50 0000 L CNN
F 2 "" H 1150 2600 50 0001 C CNN
F 3 "~" H 1150 2600 50 0001 C CNN
1 1150 2600
-1 0 0 1
$EndComp
$Comp
L Device:C C?
U 1 1 6093EE1D
P 1500 1500
F 0 "C?" H 1615 1546 50 0001 L CNN
F 1 "100pF" V 1615 1500 50 0000 C TNN
F 2 "" H 1538 1350 50 0001 C CNN
F 3 "~" H 1500 1500 50 0001 C CNN
1 1500 1500
0 -1 -1 0
$EndComp
$Comp
L Device:R R?
U 1 1 60941D1F
P 1650 1650
F 0 "R?" H 1720 1696 50 0001 L CNN
F 1 "1M/5%" V 1720 1650 50 0000 C TNN
F 2 "" V 1580 1650 50 0001 C CNN
F 3 "~" H 1650 1650 50 0001 C CNN
1 1650 1650
1 0 0 -1
$EndComp
Wire Wire Line
1650 1500 1900 1500
Connection ~ 1650 1500
Wire Wire Line
2150 1850 1900 1850
Wire Wire Line
1900 1850 1900 1700
Wire Wire Line
2450 1850 2500 1850
Wire Wire Line
2500 1850 2500 1600
$Comp
L Device:R R?
U 1 1 60945E35
P 1900 2050
F 0 "R?" H 1970 2096 50 0001 L CNN
F 1 "1M/5%" V 1970 2050 50 0000 C TNN
F 2 "" V 1830 2050 50 0001 C CNN
F 3 "~" H 1900 2050 50 0001 C CNN
1 1900 2050
1 0 0 -1
$EndComp
$Comp
L Device:R R?
U 1 1 60951A71
P 2300 2250
F 0 "R?" H 2370 2296 50 0001 L CNN
F 1 "1M/5%" V 2370 2250 50 0000 C TNN
F 2 "" V 2230 2250 50 0001 C CNN
F 3 "~" H 2300 2250 50 0001 C CNN
1 2300 2250
0 -1 -1 0
$EndComp
Wire Wire Line
2150 2250 1900 2250
Wire Wire Line
2450 2250 2500 2250
Wire Wire Line
1900 2250 1900 2400
Wire Wire Line
1900 1900 1900 1850
Connection ~ 1900 1850
Wire Wire Line
1900 2250 1900 2200
Connection ~ 1900 2250
$Comp
L Device:C C?
U 1 1 6095A525
P 1500 2600
F 0 "C?" H 1615 2646 50 0001 L CNN
F 1 "100pF" V 1615 2600 50 0000 C TNN
F 2 "" H 1538 2450 50 0001 C CNN
F 3 "~" H 1500 2600 50 0001 C CNN
1 1500 2600
0 1 1 0
$EndComp
$Comp
L Device:R R?
U 1 1 6095A52B
P 1650 2450
F 0 "R?" H 1720 2496 50 0001 L CNN
F 1 "1M/5%" V 1720 2450 50 0000 C TNN
F 2 "" V 1580 2450 50 0001 C CNN
F 3 "~" H 1650 2450 50 0001 C CNN
1 1650 2450
1 0 0 -1
$EndComp
Wire Wire Line
1650 2600 1900 2600
$Comp
L Device:R R?
U 1 1 609441DE
P 2300 1850
F 0 "R?" H 2370 1896 50 0001 L CNN
F 1 "1M/5%" V 2370 1850 50 0000 C TNN
F 2 "" V 2230 1850 50 0001 C CNN
F 3 "~" H 2300 1850 50 0001 C CNN
1 2300 1850
0 1 1 0
$EndComp
$Comp
L Amplifier_Operational:LM324 U1
U 2 1 6092B3CA
P 2200 1600
F 0 "U1" H 2200 1967 50 0000 C TNN
F 1 "LM324" H 2200 1876 50 0000 C TNN
F 2 "" H 2150 1700 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 2250 1800 50 0001 C CNN
2 2200 1600
1 0 0 -1
$EndComp
$Comp
L Device:R R?
U 1 1 609606DE
P 2650 1850
F 0 "R?" H 2720 1896 50 0001 L CNN
F 1 "1K/5%" V 2720 1850 50 0000 C TNN
F 2 "" V 2580 1850 50 0001 C CNN
F 3 "~" H 2650 1850 50 0001 C CNN
1 2650 1850
0 1 1 0
$EndComp
$Comp
L Device:R R?
U 1 1 60960FB6
P 2650 2250
F 0 "R?" H 2720 2296 50 0001 L CNN
F 1 "1K/5%" V 2720 2250 50 0000 C TNN
F 2 "" V 2580 2250 50 0001 C CNN
F 3 "~" H 2650 2250 50 0001 C CNN
1 2650 2250
0 1 1 0
$EndComp
Connection ~ 2500 1850
Wire Wire Line
2800 1850 2900 1850
Wire Wire Line
2900 1850 2900 1950
Wire Wire Line
2800 2250 2900 2250
Wire Wire Line
2900 2250 2900 2150
$Comp
L Device:R R?
U 1 1 6096B20E
P 3350 1600
F 0 "R?" H 3420 1646 50 0001 L CNN
F 1 "22K/5%" V 3420 1600 50 0000 C TNN
F 2 "" V 3280 1600 50 0001 C CNN
F 3 "~" H 3350 1600 50 0001 C CNN
1 3350 1600
0 -1 -1 0
$EndComp
Wire Wire Line
2950 1950 2900 1950
Wire Wire Line
2900 2150 2950 2150
Connection ~ 1650 2600
$Comp
L Connector:Conn_01x01_Female J?
U 1 1 6093A0A6
P 1150 1500
F 0 "J?" H 1178 1526 50 0001 L CNN
F 1 "Electrode 1" H 1178 1480 50 0000 L CNN
F 2 "" H 1150 1500 50 0001 C CNN
F 3 "~" H 1150 1500 50 0001 C CNN
1 1150 1500
-1 0 0 1
$EndComp
Wire Wire Line
1800 3550 1900 3550
$Comp
L Device:C C?
U 1 1 60865BD7
P 2400 3650
F 0 "C?" H 2515 3696 50 0001 L CNN
F 1 "10pF" V 2515 3650 50 0000 C TNN
F 2 "" H 2438 3500 50 0001 C CNN
F 3 "~" H 2400 3650 50 0001 C CNN
1 2400 3650
0 1 1 0
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 608629D5
P 2550 3650
F 0 "#PWR?" H 2550 3400 50 0001 C CNN
F 1 "Earth" H 2550 3500 50 0001 C CNN
F 2 "" H 2550 3650 50 0001 C CNN
F 3 "~" H 2550 3650 50 0001 C CNN
1 2550 3650
1 0 0 -1
$EndComp
$Comp
L Amplifier_Operational:LM324 U1
U 4 1 609A852B
P 3250 2050
F 0 "U1" H 3250 2417 50 0000 C TNN
F 1 "LM324" H 3250 2326 50 0000 C TNN
F 2 "" H 3200 2150 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 3300 2250 50 0001 C CNN
4 3250 2050
1 0 0 -1
$EndComp
Wire Wire Line
2500 2250 2500 2500
$Comp
L Device:R R?
U 1 1 609B32C1
P 3350 2500
F 0 "R?" H 3420 2546 50 0001 L CNN
F 1 "22K/5%" V 3420 2500 50 0000 C TNN
F 2 "" V 3280 2500 50 0001 C CNN
F 3 "~" H 3350 2500 50 0001 C CNN
1 3350 2500
0 1 1 0
$EndComp
Wire Wire Line
3200 1600 2900 1600
Wire Wire Line
2900 1600 2900 1850
Connection ~ 2900 1850
Wire Wire Line
3200 2500 2900 2500
Wire Wire Line
2900 2500 2900 2250
Connection ~ 2900 2250
Wire Wire Line
3550 2050 3650 2050
Wire Wire Line
3650 2050 3650 2500
Wire Wire Line
3650 2500 3500 2500
$Comp
L Device:R R?
U 1 1 60920C09
P 2950 1000
F 0 "R?" H 3020 1046 50 0001 L CNN
F 1 "560k/5%" V 3020 1000 50 0000 C TNN
F 2 "" V 2880 1000 50 0001 C CNN
F 3 "~" H 2950 1000 50 0001 C CNN
1 2950 1000
0 1 1 0
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 6091F63D
P 3200 1300
F 0 "#PWR?" H 3200 1050 50 0001 C CNN
F 1 "Earth" H 3200 1150 50 0001 C CNN
F 2 "" H 3200 1300 50 0001 C CNN
F 3 "~" H 3200 1300 50 0001 C CNN
1 3200 1300
1 0 0 -1
$EndComp
$Comp
L power:+5V #PWR?
U 1 1 6091F637
P 2400 1000
F 0 "#PWR?" H 2400 850 50 0001 C CNN
F 1 "+5V" V 2415 1173 50 0000 C CNN
F 2 "" H 2400 1000 50 0001 C CNN
F 3 "" H 2400 1000 50 0001 C CNN
1 2400 1000
0 -1 -1 0
$EndComp
$Comp
L Device:R R?
U 1 1 6091F630
P 3200 1150
F 0 "R?" H 3270 1196 50 0001 L CNN
F 1 "560k/5%" H 3270 1150 50 0000 L CNN
F 2 "" V 3130 1150 50 0001 C CNN
F 3 "~" H 3200 1150 50 0001 C CNN
1 3200 1150
1 0 0 -1
$EndComp
$Comp
L Amplifier_Operational:LM324 U2
U 5 1 608C0B19
P 4100 1100
F 0 "U2" H 4058 1146 50 0001 L CNN
F 1 "LM324" H 4058 1100 50 0001 L CNN
F 2 "" H 4050 1200 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 4150 1300 50 0001 C CNN
5 4100 1100
1 0 0 -1
$EndComp
$Comp
L Amplifier_Operational:LM324 U2
U 1 1 60877ADA
P 4100 1100
F 0 "U2" H 4100 1467 50 0000 L CNN
F 1 "LM324" H 4100 1376 50 0000 L CNN
F 2 "" H 4050 1200 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 4150 1300 50 0001 C CNN
1 4100 1100
1 0 0 -1
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 608C33C7
P 4000 1400
F 0 "#PWR?" H 4000 1150 50 0001 C CNN
F 1 "Earth" H 4000 1250 50 0001 C CNN
F 2 "" H 4000 1400 50 0001 C CNN
F 3 "~" H 4000 1400 50 0001 C CNN
1 4000 1400
1 0 0 -1
$EndComp
$Comp
L Device:R R?
U 1 1 6091F628
P 2550 1000
F 0 "R?" H 2620 1046 50 0001 L CNN
F 1 "560k/5%" V 2620 1000 50 0000 C TNN
F 2 "" V 2480 1000 50 0001 C CNN
F 3 "~" H 2550 1000 50 0001 C CNN
1 2550 1000
0 1 1 0
$EndComp
$Comp
L power:+5V #PWR?
U 1 1 608C2D73
P 4000 800
F 0 "#PWR?" H 4000 650 50 0001 C CNN
F 1 "+5V" H 4015 973 50 0000 C CNN
F 2 "" H 4000 800 50 0001 C CNN
F 3 "" H 4000 800 50 0001 C CNN
1 4000 800
1 0 0 -1
$EndComp
Wire Wire Line
3200 1000 3100 1000
Wire Wire Line
4150 3900 4150 3950
Wire Wire Line
4150 3950 3700 3950
Wire Wire Line
3700 3950 3700 3800
$Comp
L power:Earth #PWR?
U 1 1 609F64A2
P 3850 1900
F 0 "#PWR?" H 3850 1650 50 0001 C CNN
F 1 "Earth" H 3850 1750 50 0001 C CNN
F 2 "" H 3850 1900 50 0001 C CNN
F 3 "~" H 3850 1900 50 0001 C CNN
1 3850 1900
1 0 0 -1
$EndComp
Wire Wire Line
2700 1000 2800 1000
Connection ~ 3800 1000
Wire Wire Line
3800 1000 3850 1000
Wire Wire Line
3800 1200 3800 1600
Wire Wire Line
4400 1100 4500 1100
Wire Wire Line
3350 3450 3200 3450
Wire Wire Line
1300 3350 1450 3350
$Comp
L Amplifier_Operational:LM324 U1
U 1 1 609A41F2
P 2200 3450
F 0 "U1" H 2200 3817 50 0000 L TNN
F 1 "LM324" H 2200 3726 50 0000 L TNN
F 2 "" H 2150 3550 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 2250 3650 50 0001 C CNN
1 2200 3450
1 0 0 -1
$EndComp
$Comp
L Connector:TestPoint_Probe TP?
U 1 1 60A4A307
P 4500 1100
F 0 "TP?" H 4653 1201 50 0001 L CNN
F 1 "1.66V" H 4652 1155 50 0000 L CNN
F 2 "" H 4700 1100 50 0001 C CNN
F 3 "~" H 4700 1100 50 0001 C CNN
1 4500 1100
1 0 0 -1
$EndComp
$Comp
L Connector:TestPoint_Probe TP?
U 1 1 60A4C531
P 2500 3350
F 0 "TP?" H 2653 3451 50 0001 L CNN
F 1 "2.5V" H 2652 3405 50 0000 L CNN
F 2 "" H 2700 3350 50 0001 C CNN
F 3 "~" H 2700 3350 50 0001 C CNN
1 2500 3350
1 0 0 -1
$EndComp
Wire Wire Line
2500 3350 2500 3450
Connection ~ 2500 3450
Wire Wire Line
1450 3350 1900 3350
$Comp
L power:Earth #PWR?
U 1 1 60A56E8A
P 2700 4200
F 0 "#PWR?" H 2700 3950 50 0001 C CNN
F 1 "Earth" H 2700 4050 50 0001 C CNN
F 2 "" H 2700 4200 50 0001 C CNN
F 3 "~" H 2700 4200 50 0001 C CNN
1 2700 4200
1 0 0 -1
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 60A59887
P 2400 4200
F 0 "#PWR?" H 2400 3950 50 0001 C CNN
F 1 "Earth" H 2400 4050 50 0001 C CNN
F 2 "" H 2400 4200 50 0001 C CNN
F 3 "~" H 2400 4200 50 0001 C CNN
1 2400 4200
1 0 0 -1
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 60A5A486
P 2100 4200
F 0 "#PWR?" H 2100 3950 50 0001 C CNN
F 1 "Earth" H 2100 4050 50 0001 C CNN
F 2 "" H 2100 4200 50 0001 C CNN
F 3 "~" H 2100 4200 50 0001 C CNN
1 2100 4200
1 0 0 -1
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 60A5B0E8
P 1800 4200
F 0 "#PWR?" H 1800 3950 50 0001 C CNN
F 1 "Earth" H 1800 4050 50 0001 C CNN
F 2 "" H 1800 4200 50 0001 C CNN
F 3 "~" H 1800 4200 50 0001 C CNN
1 1800 4200
1 0 0 -1
$EndComp
Wire Wire Line
2250 3650 2250 3750
Wire Wire Line
2250 3750 2100 3750
Wire Wire Line
1800 3550 1800 3900
Wire Wire Line
2700 3900 2700 3650
Connection ~ 2700 3650
Wire Wire Line
1800 3900 2100 3900
Connection ~ 1800 3900
Wire Wire Line
2400 3900 2100 3900
Connection ~ 2100 3900
Wire Wire Line
2400 3900 2700 3900
Connection ~ 2400 3900
Connection ~ 2700 3900
$Comp
L Amplifier_Operational:LM324 U1
U 3 1 60854854
P 2200 2500
F 0 "U1" H 2200 2867 50 0000 C TNN
F 1 "LM324" H 2200 2776 50 0000 C TNN
F 2 "" H 2150 2600 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 2250 2700 50 0001 C CNN
3 2200 2500
1 0 0 1
$EndComp
Wire Notes Line
1800 1200 1800 2900
Wire Notes Line
2500 1450 2500 1200
Wire Notes Line
2500 1200 1800 1200
Text Notes 2600 2900 0 50 ~ 0
Instrumentational Amplifier\nGain = 66 (36.4dB)
Wire Wire Line
3200 1000 3800 1000
Connection ~ 3200 1000
Wire Wire Line
3500 1600 3800 1600
Wire Wire Line
3650 2500 3750 2500
Wire Wire Line
3750 2500 3750 2900
Wire Wire Line
3750 2900 3850 2900
Connection ~ 3650 2500
Wire Notes Line
1800 2900 3700 2900
Wire Notes Line
2500 1450 3700 1450
Wire Notes Line
3700 1450 3700 2900
Text Notes 2600 3200 0 50 ~ 0
Fake a "ground" between\n+5V and Arduino's GND
Text Notes 950 3100 0 50 ~ 0
Capacitors\nto remove\nVoltage offset\nbetween\nElectrodes
Connection ~ 4400 1100
Text Notes 1850 850 0 50 ~ 0
Output voltage of LM324 OpAmp cuts off at 3.6V.\nTo capture most of the signal, we need a\nreference voltage near the middle of that. (1.66V)
Wire Wire Line
4400 1100 4400 1600
Connection ~ 3800 1600
Wire Wire Line
3800 1600 4050 1600
$Comp
L Device:CP C?
U 1 1 60ABD0B3
P 4050 1750
F 0 "C?" H 4165 1796 50 0001 L CNN
F 1 "220uF" V 4168 1750 50 0000 C TNN
F 2 "" H 4088 1600 50 0001 C CNN
F 3 "~" H 4050 1750 50 0001 C CNN
1 4050 1750
1 0 0 -1
$EndComp
Connection ~ 4050 1600
Wire Wire Line
4050 1600 4400 1600
Wire Wire Line
3850 1900 4050 1900
Connection ~ 4050 1900
Wire Wire Line
4050 1900 4250 1900
$Comp
L power:+2V5 #PWR?
U 1 1 60850F16
P 3000 3650
F 0 "#PWR?" H 3000 3500 50 0001 C CNN
F 1 "+2V5" H 3015 3823 50 0000 C CNN
F 2 "" H 3000 3650 50 0001 C CNN
F 3 "" H 3000 3650 50 0001 C CNN
1 3000 3650
-1 0 0 1
$EndComp
$Comp
L power:+2V5 #PWR?
U 1 1 608538B9
P 1650 2300
F 0 "#PWR?" H 1650 2150 50 0001 C CNN
F 1 "+2V5" H 1665 2473 50 0000 C CNN
F 2 "" H 1650 2300 50 0001 C CNN
F 3 "" H 1650 2300 50 0001 C CNN
1 1650 2300
1 0 0 -1
$EndComp
$Comp
L power:+2V5 #PWR?
U 1 1 608547EC
P 1650 1800
F 0 "#PWR?" H 1650 1650 50 0001 C CNN
F 1 "+2V5" H 1665 1973 50 0000 C CNN
F 2 "" H 1650 1800 50 0001 C CNN
F 3 "" H 1650 1800 50 0001 C CNN
1 1650 1800
-1 0 0 1
$EndComp
Connection ~ 2500 2250
Text Notes 4850 4300 2 50 ~ 0
https://psylink.me/c4
$EndSCHEMATC