Makeshift Neural Interface https://psylink.me
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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 Device:R R1
U 1 1 6084FC80
P 2500 2950
F 0 "R1" H 2570 2996 50 0001 L CNN
F 1 "1M/5%" V 2570 2950 50 0000 C TNN
F 2 "" V 2430 2950 50 0001 C CNN
F 3 "~" H 2500 2950 50 0001 C CNN
1 2500 2950
-1 0 0 1
$EndComp
$Comp
L Amplifier_Operational:LM324 U?
U 5 1 60856203
P 3100 3200
F 0 "U?" H 3058 3246 50 0001 L CNN
F 1 "LM324" H 3058 3155 50 0001 L CNN
F 2 "" H 3050 3300 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 3150 3400 50 0001 C CNN
5 3100 3200
1 0 0 -1
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 60864F96
P 2500 3400
F 0 "#PWR?" H 2500 3150 50 0001 C CNN
F 1 "Earth" H 2500 3250 50 0001 C CNN
F 2 "" H 2500 3400 50 0001 C CNN
F 3 "~" H 2500 3400 50 0001 C CNN
1 2500 3400
1 0 0 -1
$EndComp
$Comp
L Device:R R?
U 1 1 608772AE
P 1850 2850
F 0 "R?" V 1643 2850 50 0001 C CNN
F 1 "100k/5%" V 1735 2850 50 0000 C CNN
F 2 "" V 1780 2850 50 0001 C CNN
F 3 "~" H 1850 2850 50 0001 C CNN
1 1850 2850
0 1 1 0
$EndComp
$Comp
L Connector:Conn_01x01_Female J?
U 1 1 6088CF1C
P 1500 2850
F 0 "J?" H 1528 2876 50 0001 L CNN
F 1 "Electrode GND" H 1528 2830 50 0000 L CNN
F 2 "" H 1500 2850 50 0001 C CNN
F 3 "~" H 1500 2850 50 0001 C CNN
1 1500 2850
-1 0 0 1
$EndComp
$Comp
L Connector:Conn_01x01_Female J?
U 1 1 6093A7BF
P 1450 1900
F 0 "J?" H 1478 1926 50 0001 L CNN
F 1 "Electrode 2" H 1478 1880 50 0000 L CNN
F 2 "" H 1450 1900 50 0001 C CNN
F 3 "~" H 1450 1900 50 0001 C CNN
1 1450 1900
-1 0 0 1
$EndComp
$Comp
L Device:C C?
U 1 1 6095A525
P 1800 1900
F 0 "C?" H 1915 1946 50 0001 L CNN
F 1 "100pF" V 1915 1900 50 0000 C TNN
F 2 "" H 1838 1750 50 0001 C CNN
F 3 "~" H 1800 1900 50 0001 C CNN
1 1800 1900
0 1 1 0
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 608629D5
P 3000 3500
F 0 "#PWR?" H 3000 3250 50 0001 C CNN
F 1 "Earth" H 3000 3350 50 0001 C CNN
F 2 "" H 3000 3500 50 0001 C CNN
F 3 "~" H 3000 3500 50 0001 C CNN
1 3000 3500
1 0 0 -1
$EndComp
$Comp
L Amplifier_Operational:LM324 U1
U 1 1 609A41F2
P 3100 3200
F 0 "U1" H 3100 3567 50 0000 L TNN
F 1 "LM324" H 3100 3476 50 0000 L TNN
F 2 "" H 3050 3300 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/lm2902-n.pdf" H 3150 3400 50 0001 C CNN
1 3100 3200
1 0 0 -1
$EndComp
$Comp
L Connector:TestPoint_Probe TP?
U 1 1 60A4C531
P 3450 3200
F 0 "TP?" H 3603 3301 50 0001 L CNN
F 1 "3V" H 3602 3255 50 0000 L CNN
F 2 "" H 3650 3200 50 0001 C CNN
F 3 "~" H 3650 3200 50 0001 C CNN
1 3450 3200
1 0 0 -1
$EndComp
Text Notes 2450 3800 0 50 ~ 0
Fake a "ground" between\nthe batteries' 6V and 0V
Text Notes 1250 2450 0 50 ~ 0
Capacitors\nto remove\nvoltage offset\nbetween\nelectrodes
$Comp
L Device:R R?
U 1 1 6095A52B
P 2000 2050
F 0 "R?" H 2070 2096 50 0001 L CNN
F 1 "1M/5%" V 2070 2050 50 0000 C TNN
F 2 "" V 1930 2050 50 0001 C CNN
F 3 "~" H 2000 2050 50 0001 C CNN
1 2000 2050
1 0 0 -1
$EndComp
$Comp
L Device:R R?
U 1 1 60941D1F
P 2000 1350
F 0 "R?" H 2070 1396 50 0001 L CNN
F 1 "1M/5%" V 2070 1350 50 0000 C TNN
F 2 "" V 1930 1350 50 0001 C CNN
F 3 "~" H 2000 1350 50 0001 C CNN
1 2000 1350
1 0 0 -1
$EndComp
$Comp
L Connector:Conn_01x01_Female J?
U 1 1 6093A0A6
P 1450 1500
F 0 "J?" H 1478 1526 50 0001 L CNN
F 1 "Electrode 1" H 1478 1480 50 0000 L CNN
F 2 "" H 1450 1500 50 0001 C CNN
F 3 "~" H 1450 1500 50 0001 C CNN
1 1450 1500
-1 0 0 1
$EndComp
$Comp
L Device:C C?
U 1 1 6093EE1D
P 1800 1500
F 0 "C?" H 1915 1546 50 0001 L CNN
F 1 "100pF" V 1915 1500 50 0000 C TNN
F 2 "" H 1838 1350 50 0001 C CNN
F 3 "~" H 1800 1500 50 0001 C CNN
1 1800 1500
0 -1 -1 0
$EndComp
Wire Wire Line
2250 1500 2000 1500
Connection ~ 2000 1500
Wire Wire Line
2000 1500 1950 1500
Wire Wire Line
1950 1900 2000 1900
Connection ~ 2000 1900
Wire Wire Line
2000 1900 2250 1900
$Comp
L Device:R R?
U 1 1 608BC652
P 2100 1800
F 0 "R?" H 2170 1846 50 0001 L CNN
F 1 "1K/1%" V 2170 1800 50 0000 C TNN
F 2 "" V 2030 1800 50 0001 C CNN
F 3 "~" H 2100 1800 50 0001 C CNN
1 2100 1800
0 -1 -1 0
$EndComp
Wire Wire Line
1950 1800 1950 1600
Wire Wire Line
1950 1600 2250 1600
$Comp
L power:Earth #PWR?
U 1 1 60A5B0E8
P 2650 3300
F 0 "#PWR?" H 2650 3050 50 0001 C CNN
F 1 "Earth" H 2650 3150 50 0001 C CNN
F 2 "" H 2650 3300 50 0001 C CNN
F 3 "~" H 2650 3300 50 0001 C CNN
1 2650 3300
1 0 0 -1
$EndComp
$Comp
L Device:C C?
U 1 1 608CA25E
P 2400 1200
F 0 "C?" H 2515 1246 50 0001 L CNN
F 1 "100nF" V 2515 1200 50 0000 C TNN
F 2 "" H 2438 1050 50 0001 C CNN
F 3 "~" H 2400 1200 50 0001 C CNN
1 2400 1200
0 1 1 0
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 608D13B5
P 2250 1200
F 0 "#PWR?" H 2250 950 50 0001 C CNN
F 1 "Earth" H 2250 1050 50 0001 C CNN
F 2 "" H 2250 1200 50 0001 C CNN
F 3 "~" H 2250 1200 50 0001 C CNN
1 2250 1200
1 0 0 -1
$EndComp
$Comp
L Device:CP C?
U 1 1 608DD1DD
P 2800 2900
F 0 "C?" V 2545 2900 50 0001 C CNN
F 1 "220uF" V 2637 2900 50 0000 C CNN
F 2 "" H 2838 2750 50 0001 C CNN
F 3 "~" H 2800 2900 50 0001 C CNN
1 2800 2900
0 1 1 0
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 608E21E1
P 2650 2900
F 0 "#PWR?" H 2650 2650 50 0001 C CNN
F 1 "Earth" H 2650 2750 50 0001 C CNN
F 2 "" H 2650 2900 50 0001 C CNN
F 3 "~" H 2650 2900 50 0001 C CNN
1 2650 2900
1 0 0 -1
$EndComp
$Comp
L Device:R R?
U 1 1 608E42F4
P 2500 3250
F 0 "R?" H 2570 3296 50 0001 L CNN
F 1 "1M/5%" V 2570 3250 50 0000 C TNN
F 2 "" V 2430 3250 50 0001 C CNN
F 3 "~" H 2500 3250 50 0001 C CNN
1 2500 3250
-1 0 0 1
$EndComp
Connection ~ 2500 3100
Wire Wire Line
2500 3100 2800 3100
$Comp
L power:+BATT #PWR?
U 1 1 608E87CC
P 2500 2800
F 0 "#PWR?" H 2500 2650 50 0001 C CNN
F 1 "+BATT" H 2515 2973 50 0000 C CNN
F 2 "" H 2500 2800 50 0001 C CNN
F 3 "" H 2500 2800 50 0001 C CNN
1 2500 2800
1 0 0 -1
$EndComp
$Comp
L power:+BATT #PWR?
U 1 1 608EA8CA
P 2550 1200
F 0 "#PWR?" H 2550 1050 50 0001 C CNN
F 1 "+BATT" H 2565 1373 50 0000 C CNN
F 2 "" H 2550 1200 50 0001 C CNN
F 3 "" H 2550 1200 50 0001 C CNN
1 2550 1200
1 0 0 -1
$EndComp
$Comp
L power:+BATT #PWR?
U 1 1 608EB130
P 3000 2800
F 0 "#PWR?" H 3000 2650 50 0001 C CNN
F 1 "+BATT" H 3015 2973 50 0000 C CNN
F 2 "" H 3000 2800 50 0001 C CNN
F 3 "" H 3000 2800 50 0001 C CNN
1 3000 2800
1 0 0 -1
$EndComp
Wire Wire Line
3000 2800 3000 2900
Wire Wire Line
2950 2900 3000 2900
Connection ~ 3000 2900
$Comp
L power:GNDS #PWR?
U 1 1 608F6785
P 2000 1200
F 0 "#PWR?" H 2000 950 50 0001 C CNN
F 1 "GNDS" H 2005 1027 50 0000 C CNN
F 2 "" H 2000 1200 50 0001 C CNN
F 3 "" H 2000 1200 50 0001 C CNN
1 2000 1200
-1 0 0 1
$EndComp
$Comp
L power:GNDS #PWR?
U 1 1 608F7294
P 2000 2200
F 0 "#PWR?" H 2000 1950 50 0001 C CNN
F 1 "GNDS" H 2005 2027 50 0000 C CNN
F 2 "" H 2000 2200 50 0001 C CNN
F 3 "" H 2000 2200 50 0001 C CNN
1 2000 2200
1 0 0 -1
$EndComp
$Comp
L power:GNDS #PWR?
U 1 1 608F7B0A
P 3450 3250
F 0 "#PWR?" H 3450 3000 50 0001 C CNN
F 1 "GNDS" H 3455 3077 50 0000 C CNN
F 2 "" H 3450 3250 50 0001 C CNN
F 3 "" H 3450 3250 50 0001 C CNN
1 3450 3250
1 0 0 -1
$EndComp
Wire Wire Line
3450 3250 3450 3200
Wire Wire Line
3400 3200 3450 3200
Connection ~ 3450 3200
$Comp
L MCU_Module:Arduino_Nano_v3.x A?
U 1 1 60849281
P 4250 2250
F 0 "A?" H 4250 1161 50 0001 C CNN
F 1 "Arduino_Nano_v3.x" H 4250 1070 50 0001 C CNN
F 2 "Module:Arduino_Nano" H 4250 2250 50 0001 C CIN
F 3 "http://www.mouser.com/pdfdocs/Gravitech_Arduino_Nano3_0.pdf" H 4250 2250 50 0001 C CNN
1 4250 2250
-1 0 0 1
$EndComp
$Comp
L Device:Battery BT?
U 1 1 6090704F
P 1250 3400
F 0 "BT?" H 1358 3446 50 0001 L CNN
F 1 "6V" H 1358 3400 50 0000 L CNN
F 2 "" V 1250 3460 50 0001 C CNN
F 3 "~" V 1250 3460 50 0001 C CNN
1 1250 3400
1 0 0 -1
$EndComp
$Comp
L Switch:SW_DPST_x2 SW?
U 1 1 6090AB67
P 1450 3200
F 0 "SW?" H 1450 3435 50 0001 C CNN
F 1 "SW_DPST_x2" H 1450 3344 50 0001 C CNN
F 2 "" H 1450 3200 50 0001 C CNN
F 3 "~" H 1450 3200 50 0001 C CNN
1 1450 3200
1 0 0 -1
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 6090DEAB
P 1250 3600
F 0 "#PWR?" H 1250 3350 50 0001 C CNN
F 1 "Earth" H 1250 3450 50 0001 C CNN
F 2 "" H 1250 3600 50 0001 C CNN
F 3 "~" H 1250 3600 50 0001 C CNN
1 1250 3600
1 0 0 -1
$EndComp
Wire Wire Line
1700 3250 1700 3200
Wire Wire Line
1700 3200 1650 3200
$Comp
L power:Earth #PWR?
U 1 1 609157E7
P 1700 3600
F 0 "#PWR?" H 1700 3350 50 0001 C CNN
F 1 "Earth" H 1700 3450 50 0001 C CNN
F 2 "" H 1700 3600 50 0001 C CNN
F 3 "~" H 1700 3600 50 0001 C CNN
1 1700 3600
1 0 0 -1
$EndComp
Wire Wire Line
1700 3550 1700 3600
$Comp
L power:Earth #PWR?
U 1 1 6091D90C
P 4000 1150
F 0 "#PWR?" H 4000 900 50 0001 C CNN
F 1 "Earth" H 4000 1000 50 0001 C CNN
F 2 "" H 4000 1150 50 0001 C CNN
F 3 "~" H 4000 1150 50 0001 C CNN
1 4000 1150
1 0 0 -1
$EndComp
Wire Wire Line
4000 1150 4150 1150
Wire Wire Line
4150 1150 4150 1250
$Comp
L power:+BATT #PWR?
U 1 1 6091E947
P 4150 3250
F 0 "#PWR?" H 4150 3100 50 0001 C CNN
F 1 "+BATT" H 4165 3423 50 0000 C CNN
F 2 "" H 4150 3250 50 0001 C CNN
F 3 "" H 4150 3250 50 0001 C CNN
1 4150 3250
-1 0 0 1
$EndComp
Wire Wire Line
2100 2850 2000 2850
Wire Wire Line
2800 3300 2650 3300
Connection ~ 1700 3200
Wire Wire Line
1750 3200 1700 3200
$Comp
L power:+BATT #PWR?
U 1 1 609113AC
P 1750 3200
F 0 "#PWR?" H 1750 3050 50 0001 C CNN
F 1 "+BATT" V 1765 3373 50 0000 C CNN
F 2 "" H 1750 3200 50 0001 C CNN
F 3 "" H 1750 3200 50 0001 C CNN
1 1750 3200
0 1 1 0
$EndComp
$Comp
L Device:CP C?
U 1 1 609131A6
P 1700 3400
F 0 "C?" V 1445 3400 50 0001 C CNN
F 1 "2.2mF" V 1818 3400 50 0000 C TNN
F 2 "" H 1738 3250 50 0001 C CNN
F 3 "~" H 1700 3400 50 0001 C CNN
1 1700 3400
1 0 0 -1
$EndComp
Text Notes 2600 1500 0 50 ~ 0
Instrumentational\namplifier,\ngain = 50 (34dB)
$Comp
L power:Earth #PWR?
U 1 1 608D7F4C
P 2550 2000
F 0 "#PWR?" H 2550 1750 50 0001 C CNN
F 1 "Earth" H 2550 1850 50 0001 C CNN
F 2 "" H 2550 2000 50 0001 C CNN
F 3 "~" H 2550 2000 50 0001 C CNN
1 2550 2000
-1 0 0 -1
$EndComp
Connection ~ 2550 1200
Wire Wire Line
2550 1200 2550 1400
$Comp
L power:GNDS #PWR?
U 1 1 608FD740
P 2100 2850
F 0 "#PWR?" H 2100 2600 50 0001 C CNN
F 1 "GNDS" H 2105 2677 50 0000 C CNN
F 2 "" H 2100 2850 50 0001 C CNN
F 3 "" H 2100 2850 50 0001 C CNN
1 2100 2850
1 0 0 -1
$EndComp
$Comp
L Amplifier_Instrumentation:INA128 U?
U 1 1 6089F0CF
P 2550 1700
F 0 "U?" H 2994 1746 50 0001 L CNN
F 1 "INA128" H 2994 1655 50 0000 C TNN
F 2 "" H 2650 1700 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/ina128.pdf" H 2650 1700 50 0001 C CNN
1 2550 1700
1 0 0 -1
$EndComp
$Comp
L power:GNDS #PWR?
U 1 1 608F17B2
P 2650 2050
F 0 "#PWR?" H 2650 1800 50 0001 C CNN
F 1 "GNDS" H 2655 1877 50 0000 C CNN
F 2 "" H 2650 2050 50 0001 C CNN
F 3 "" H 2650 2050 50 0001 C CNN
1 2650 2050
1 0 0 -1
$EndComp
Wire Wire Line
2650 2000 2650 2050
Wire Wire Line
3750 2250 3600 2250
Wire Wire Line
3600 2250 3600 1700
Wire Wire Line
2950 1700 3600 1700
Wire Notes Line
950 950 950 2500
Wire Notes Line
950 2500 3350 2500
Wire Notes Line
3350 2500 3350 950
Wire Notes Line
3350 950 950 950
Text Notes 1000 1150 0 50 ~ 0
One of these\nper electrode pair
Text Notes 4750 3800 2 50 ~ 0
https://psylink.me/c5.1
$EndSCHEMATC