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 1500 2000
F 0 "J?" H 1528 2026 50 0001 L CNN
F 1 "Electrode 2" H 1528 1980 50 0000 L CNN
F 2 "" H 1500 2000 50 0001 C CNN
F 3 "~" H 1500 2000 50 0001 C CNN
1 1500 2000
-1 0 0 1
$EndComp
$Comp
L Device:C C?
U 1 1 6095A525
P 2150 2000
F 0 "C?" H 2265 2046 50 0001 L CNN
F 1 "100pF" V 2265 2000 50 0000 C TNN
F 2 "" H 2188 1850 50 0001 C CNN
F 3 "~" H 2150 2000 50 0001 C CNN
1 2150 2000
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 1600 2550 0 50 ~ 0
Capacitors\nto remove\nvoltage offset\nbetween\nelectrodes
Text Notes 4750 3800 2 50 ~ 0
https://psylink.me/c5
$Comp
L Device:R R?
U 1 1 6095A52B
P 2350 2150
F 0 "R?" H 2420 2196 50 0001 L CNN
F 1 "1M/5%" V 2420 2150 50 0000 C TNN
F 2 "" V 2280 2150 50 0001 C CNN
F 3 "~" H 2350 2150 50 0001 C CNN
1 2350 2150
1 0 0 -1
$EndComp
$Comp
L Device:R R?
U 1 1 60941D1F
P 2350 1450
F 0 "R?" H 2420 1496 50 0001 L CNN
F 1 "1M/5%" V 2420 1450 50 0000 C TNN
F 2 "" V 2280 1450 50 0001 C CNN
F 3 "~" H 2350 1450 50 0001 C CNN
1 2350 1450
1 0 0 -1
$EndComp
$Comp
L Connector:Conn_01x01_Female J?
U 1 1 6093A0A6
P 1500 1600
F 0 "J?" H 1528 1626 50 0001 L CNN
F 1 "Electrode 1" H 1528 1580 50 0000 L CNN
F 2 "" H 1500 1600 50 0001 C CNN
F 3 "~" H 1500 1600 50 0001 C CNN
1 1500 1600
-1 0 0 1
$EndComp
$Comp
L Device:C C?
U 1 1 6093EE1D
P 2150 1600
F 0 "C?" H 2265 1646 50 0001 L CNN
F 1 "100pF" V 2265 1600 50 0000 C TNN
F 2 "" H 2188 1450 50 0001 C CNN
F 3 "~" H 2150 1600 50 0001 C CNN
1 2150 1600
0 -1 -1 0
$EndComp
Wire Wire Line
2600 1600 2350 1600
Connection ~ 2350 1600
Wire Wire Line
2350 1600 2300 1600
Wire Wire Line
2300 2000 2350 2000
Connection ~ 2350 2000
Wire Wire Line
2350 2000 2600 2000
$Comp
L Device:R R?
U 1 1 608BC652
P 2450 1900
F 0 "R?" H 2520 1946 50 0001 L CNN
F 1 "1K/1%" V 2520 1900 50 0000 C TNN
F 2 "" V 2380 1900 50 0001 C CNN
F 3 "~" H 2450 1900 50 0001 C CNN
1 2450 1900
0 -1 -1 0
$EndComp
Wire Wire Line
2300 1900 2300 1700
Wire Wire Line
2300 1700 2600 1700
$Comp
L Device:R R?
U 1 1 608C1CF5
P 1850 1600
F 0 "R?" H 1920 1646 50 0001 L CNN
F 1 "1K/1%" V 1920 1600 50 0000 C TNN
F 2 "" V 1780 1600 50 0001 C CNN
F 3 "~" H 1850 1600 50 0001 C CNN
1 1850 1600
0 -1 -1 0
$EndComp
$Comp
L Device:R R?
U 1 1 608C21DA
P 1850 2000
F 0 "R?" H 1920 2046 50 0001 L CNN
F 1 "1K/1%" V 1920 2000 50 0000 C TNN
F 2 "" V 1780 2000 50 0001 C CNN
F 3 "~" H 1850 2000 50 0001 C CNN
1 1850 2000
0 -1 -1 0
$EndComp
$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 2750 1300
F 0 "C?" H 2865 1346 50 0001 L CNN
F 1 "100nF" V 2865 1300 50 0000 C TNN
F 2 "" H 2788 1150 50 0001 C CNN
F 3 "~" H 2750 1300 50 0001 C CNN
1 2750 1300
0 1 1 0
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 608D13B5
P 2600 1300
F 0 "#PWR?" H 2600 1050 50 0001 C CNN
F 1 "Earth" H 2600 1150 50 0001 C CNN
F 2 "" H 2600 1300 50 0001 C CNN
F 3 "~" H 2600 1300 50 0001 C CNN
1 2600 1300
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 2900 1300
F 0 "#PWR?" H 2900 1150 50 0001 C CNN
F 1 "+BATT" H 2915 1473 50 0000 C CNN
F 2 "" H 2900 1300 50 0001 C CNN
F 3 "" H 2900 1300 50 0001 C CNN
1 2900 1300
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 Amplifier_Instrumentation:INA128 U?
U 1 1 6089F0CF
P 2900 1800
F 0 "U?" H 3344 1846 50 0001 L CNN
F 1 "INA128" H 3344 1755 50 0000 C TNN
F 2 "" H 3000 1800 50 0001 C CNN
F 3 "http://www.ti.com/lit/ds/symlink/ina128.pdf" H 3000 1800 50 0001 C CNN
1 2900 1800
1 0 0 -1
$EndComp
$Comp
L power:GNDS #PWR?
U 1 1 608F6785
P 2350 1300
F 0 "#PWR?" H 2350 1050 50 0001 C CNN
F 1 "GNDS" H 2355 1127 50 0000 C CNN
F 2 "" H 2350 1300 50 0001 C CNN
F 3 "" H 2350 1300 50 0001 C CNN
1 2350 1300
-1 0 0 1
$EndComp
$Comp
L power:GNDS #PWR?
U 1 1 608F7294
P 2350 2300
F 0 "#PWR?" H 2350 2050 50 0001 C CNN
F 1 "GNDS" H 2355 2127 50 0000 C CNN
F 2 "" H 2350 2300 50 0001 C CNN
F 3 "" H 2350 2300 50 0001 C CNN
1 2350 2300
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
3600 1800 3300 1800
Wire Wire Line
2100 2850 2000 2850
Wire Wire Line
2800 3300 2650 3300
Wire Wire Line
3600 1800 3600 2150
Wire Wire Line
3600 2150 3750 2150
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 2950 1600 0 50 ~ 0
Instrumentational\namplifier,\ngain = 50 (34dB)
$Comp
L power:GNDS #PWR?
U 1 1 608F17B2
P 3000 2200
F 0 "#PWR?" H 3000 1950 50 0001 C CNN
F 1 "GNDS" H 3005 2027 50 0000 C CNN
F 2 "" H 3000 2200 50 0001 C CNN
F 3 "" H 3000 2200 50 0001 C CNN
1 3000 2200
1 0 0 -1
$EndComp
$Comp
L Device:C C?
U 1 1 608D7F46
P 3150 2150
F 0 "C?" H 3265 2196 50 0001 L CNN
F 1 "100nF" V 3265 2150 50 0000 C TNN
F 2 "" H 3188 2000 50 0001 C CNN
F 3 "~" H 3150 2150 50 0001 C CNN
1 3150 2150
0 -1 -1 0
$EndComp
$Comp
L power:Earth #PWR?
U 1 1 608D7F4C
P 2900 2100
F 0 "#PWR?" H 2900 1850 50 0001 C CNN
F 1 "Earth" H 2900 1950 50 0001 C CNN
F 2 "" H 2900 2100 50 0001 C CNN
F 3 "~" H 2900 2100 50 0001 C CNN
1 2900 2100
-1 0 0 -1
$EndComp
Wire Wire Line
3000 2100 3000 2150
Connection ~ 3000 2150
Wire Wire Line
3000 2150 3000 2200
$Comp
L power:Earth #PWR?
U 1 1 608B0EA2
P 3300 2200
F 0 "#PWR?" H 3300 1950 50 0001 C CNN
F 1 "Earth" H 3300 2050 50 0001 C CNN
F 2 "" H 3300 2200 50 0001 C CNN
F 3 "~" H 3300 2200 50 0001 C CNN
1 3300 2200
-1 0 0 -1
$EndComp
Wire Wire Line
3300 2200 3300 2150
Connection ~ 2900 1300
Wire Wire Line
2900 1300 2900 1500
$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
$EndSCHEMATC