diff --git a/electronics/led_driver.bak b/electronics/led_driver.bak
deleted file mode 100644
index 17c0c82..0000000
--- a/electronics/led_driver.bak
+++ /dev/null
@@ -1,58 +0,0 @@
-EESchema Schematic File Version 2
-LIBS:power
-LIBS:device
-LIBS:transistors
-LIBS:conn
-LIBS:linear
-LIBS:regul
-LIBS:74xx
-LIBS:cmos4000
-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:valves
-LIBS:myOpAmps
-EELAYER 25 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 1
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Comp
-L LM324DT U?
-U 1 1 59466506
-P 5600 3025
-F 0 "U?" H 6050 2225 60  0000 C CNN
-F 1 "LM324DT" H 5250 2225 60  0000 C CNN
-F 2 "SMD_Packages:SOIC-14_N" H 5600 3025 60  0001 C CNN
-F 3 "http://www.farnell.com/datasheets/1834360.pdf" H 5600 3025 60  0001 C CNN
-F 4 "2382609" H 5600 3025 60  0001 C CNN "Franell"
-	1    5600 3025
-	1    0    0    -1  
-$EndComp
-$EndSCHEMATC
diff --git a/electronics/led_driver.sch b/electronics/led_driver.sch
deleted file mode 100644
index d45ccc1..0000000
--- a/electronics/led_driver.sch
+++ /dev/null
@@ -1,69 +0,0 @@
-EESchema Schematic File Version 2
-LIBS:power
-LIBS:device
-LIBS:transistors
-LIBS:conn
-LIBS:linear
-LIBS:regul
-LIBS:74xx
-LIBS:cmos4000
-LIBS:adc-dac
-LIBS:memory
-LIBS:xilinx
-LIBS:microcontrollers
-LIBS:dsp
-LIBS:microchip
-LIBS:analog_switches
-LIBS:motorola
-LIBS:texas
-LIBS:intel
-LIBS:audio
-LIBS:interface
-LIBS:digital-audio
-LIBS:philips
-LIBS:display
-LIBS:cypress
-LIBS:siliconi
-LIBS:opto
-LIBS:atmel
-LIBS:contrib
-LIBS:valves
-LIBS:myOpAmps
-EELAYER 25 0
-EELAYER END
-$Descr A4 11693 8268
-encoding utf-8
-Sheet 1 1
-Title ""
-Date ""
-Rev ""
-Comp ""
-Comment1 ""
-Comment2 ""
-Comment3 ""
-Comment4 ""
-$EndDescr
-$Comp
-L LM324DT U?
-U 1 1 59466506
-P 5600 3025
-F 0 "U?" H 6050 2225 60  0000 C CNN
-F 1 "LM324DT" H 5250 2225 60  0000 C CNN
-F 2 "SMD_Packages:SOIC-14_N" H 5600 3025 60  0001 C CNN
-F 3 "http://www.farnell.com/datasheets/1834360.pdf" H 5600 3025 60  0001 C CNN
-F 4 "2382609" H 5600 3025 60  0001 C CNN "Franell"
-	1    5600 3025
-	1    0    0    -1  
-$EndComp
-$Comp
-L MMBT3904 Q?
-U 1 1 59466917
-P 7100 3575
-F 0 "Q?" H 7300 3650 50  0000 L CNN
-F 1 "MMBT3904" H 7300 3575 50  0000 L CNN
-F 2 "SOT-23" H 7300 3500 50  0000 L CIN
-F 3 "" H 7100 3575 50  0000 L CNN
-	1    7100 3575
-	1    0    0    -1  
-$EndComp
-$EndSCHEMATC
diff --git a/electronics/schematicLibs/myOpAmps.bak b/electronics/schematicLibs/myOpAmps.bak
deleted file mode 100644
index 245a2fd..0000000
--- a/electronics/schematicLibs/myOpAmps.bak
+++ /dev/null
@@ -1,58 +0,0 @@
-EESchema-LIBRARY Version 2.3
-#encoding utf-8
-#
-# LM324QT
-#
-DEF LM324QT U 0 40 Y N 1 F N
-F0 "U" 450 -800 60 H V C CNN
-F1 "LM324QT" -350 -800 60 H V C CNN
-F2 "" 0 0 60 H V C CNN
-F3 "" 0 0 60 H V C CNN
-DRAW
-T 0 -300 -250 60 0 0 0 + Normal 0 C C
-T 0 -300 250 60 0 0 0 + Normal 0 C C
-T 0 300 -250 60 0 0 0 + Normal 0 C C
-T 0 300 250 60 0 0 0 + Normal 0 C C
-T 0 -300 -350 60 0 0 0 - Normal 0 C C
-T 0 -300 350 60 0 0 0 - Normal 0 C C
-T 0 300 -350 60 0 0 0 - Normal 0 C C
-T 0 300 350 60 0 0 0 - Normal 0 C C
-T 0 -350 0 60 0 0 0 Vcc+ Normal 0 C C
-T 0 350 0 60 0 0 0 Vcc- Normal 0 C C
-S -500 700 500 -700 1 0 0 N
-P 2 0 1 0 -500 -400 -350 -400 N
-P 2 0 1 0 -500 -200 -350 -200 N
-P 2 0 1 0 -500 200 -350 200 N
-P 2 0 1 0 -500 400 -350 400 N
-P 2 0 1 0 350 -400 500 -400 N
-P 2 0 1 0 350 -200 500 -200 N
-P 2 0 1 0 350 200 500 200 N
-P 2 0 1 0 350 400 500 400 N
-P 4 0 1 0 -350 -150 -350 -450 -100 -300 -350 -150 N
-P 4 0 1 0 -350 450 -350 150 -100 300 -350 450 N
-P 4 0 1 0 -100 -300 -50 -300 -50 -600 -500 -600 N
-P 4 0 1 0 -100 300 -50 300 -50 600 -500 600 N
-P 4 0 1 0 100 -300 50 -300 50 -600 500 -600 N
-P 4 0 1 0 100 300 50 300 50 600 500 600 N
-P 4 0 1 0 350 -150 350 -450 100 -300 350 -150 N
-P 4 0 1 0 350 450 350 150 100 300 350 450 N
-X P_1 1 -700 200 200 R 50 50 1 1 I
-X Vcc+ 2 -700 0 200 R 50 50 1 1 W
-X NC 3 0 -900 200 U 50 50 1 1 N
-X P_2 4 -700 -200 200 R 50 50 1 1 I
-X N_2 5 -700 -400 200 R 50 50 1 1 I
-X O_2 6 -700 -600 200 R 50 50 1 1 O
-X O_3 7 700 -600 200 L 50 50 1 1 O
-X N_3 8 700 -400 200 L 50 50 1 1 I
-X P_3 9 700 -200 200 L 50 50 1 1 I
-X NC 10 150 -900 200 U 50 50 1 1 N N
-X Vcc- 11 700 0 200 L 50 50 1 1 W
-X P_4 12 700 200 200 L 50 50 1 1 I
-X N_4 13 700 400 200 L 50 50 1 1 I
-X O_4 14 700 600 200 L 50 50 1 1 O
-X O_1 15 -700 600 200 R 50 50 1 1 O
-X N_1 16 -700 400 200 R 50 50 1 1 I
-ENDDRAW
-ENDDEF
-#
-#End Library
diff --git a/ltspice/uv_led_driver/driver_option1.asc b/ltspice/uv_led_driver/driver_option1.asc
index 3d99b40..ff6c6c2 100644
--- a/ltspice/uv_led_driver/driver_option1.asc
+++ b/ltspice/uv_led_driver/driver_option1.asc
@@ -1,33 +1,64 @@
 Version 4
 SHEET 1 1136 680
+WIRE 144 -416 144 -448
+WIRE 272 -416 272 -448
+WIRE 400 -416 400 -448
 WIRE 400 -320 400 -352
-WIRE 704 -240 704 -272
-WIRE 832 -240 832 -272
+WIRE 144 -304 144 -336
+WIRE 272 -304 272 -336
 WIRE 400 -224 400 -256
 WIRE 400 -128 400 -160
-WIRE 704 -128 704 -160
-WIRE 832 -128 832 -160
 WIRE 400 -16 400 -64
-WIRE 160 16 16 16
+WIRE -336 16 -336 -16
+WIRE 96 16 96 -48
+WIRE 160 16 96 16
 WIRE 336 32 224 32
-WIRE 16 112 16 16
+WIRE 16 48 -48 48
+WIRE 128 48 96 48
+WIRE 160 48 128 48
+WIRE 128 96 128 48
 WIRE 400 112 400 80
-WIRE 400 112 16 112
+WIRE 400 112 368 112
+WIRE -336 128 -336 96
+WIRE -208 128 -336 128
 WIRE 400 128 400 112
+WIRE -112 144 -144 144
+WIRE -80 144 -112 144
+WIRE 64 144 0 144
+WIRE -336 160 -336 128
+WIRE 128 240 128 192
 WIRE 400 240 400 208
-FLAG 704 -128 0
-FLAG 704 -272 V+
+WIRE -336 288 -336 240
+WIRE 128 320 64 320
+WIRE 128 368 128 320
+WIRE -112 416 -112 144
+WIRE -80 416 -112 416
+WIRE 64 416 0 416
+WIRE 128 496 128 464
+WIRE 128 608 128 576
+FLAG 144 -304 0
+FLAG 144 -448 V+
 FLAG 192 0 V+
 FLAG 192 64 0
-FLAG 832 -272 VSIG
-FLAG 832 -128 0
-FLAG 160 48 VSIG
-FLAG 400 -352 V+
+FLAG 272 -448 VSIG
+FLAG 272 -304 0
+FLAG 400 -448 V+
 FLAG 400 240 0
+FLAG -48 48 VSIG
+FLAG -208 160 VSIG
+FLAG -176 112 V+
+FLAG -176 176 0
+FLAG 128 240 0
+FLAG 0 320 V+
+FLAG 128 608 0
+FLAG 368 112 VSENSE
+FLAG 96 -48 VSENSE
+FLAG -336 288 0
+FLAG -336 -16 V+
 SYMBOL Opamps\\opamp2 192 -32 R0
 SYMATTR InstName U1
 SYMATTR Value LM324
-SYMBOL voltage 704 -256 R0
+SYMBOL voltage 144 -432 R0
 WINDOW 123 0 0 Left 2
 WINDOW 39 0 0 Left 2
 SYMATTR InstName V1
@@ -35,12 +66,12 @@ SYMATTR Value 18V
 SYMBOL npn 336 -16 R0
 SYMATTR InstName Q1
 SYMATTR Value 2N3904
-SYMBOL voltage 832 -256 R0
+SYMBOL voltage 272 -432 R0
 WINDOW 3 24 44 Left 2
 WINDOW 123 0 0 Left 2
-WINDOW 39 0 0 Left 2
-SYMATTR InstName V2
+WINDOW 39 24 44 Left 2
 SYMATTR Value ""
+SYMATTR InstName V2
 SYMBOL LED 384 -128 R0
 SYMATTR InstName D1
 SYMATTR Value LXHL-BW02
@@ -53,5 +84,46 @@ SYMATTR Value LXHL-BW02
 SYMBOL LED 384 -320 R0
 SYMATTR InstName D3
 SYMATTR Value LXHL-BW02
-TEXT 688 -16 Left 2 !.include LM324.txt
-TEXT 14 264 Left 2 !.dc V2 0mV 500mV
+SYMBOL LED 384 -416 R0
+SYMATTR InstName D4
+SYMATTR Value LXHL-BW02
+SYMBOL Opamps\\opamp2 -176 80 R0
+SYMATTR InstName U2
+SYMATTR Value LM324
+SYMBOL npn 64 96 R0
+SYMATTR InstName Q2
+SYMATTR Value 2N3904
+SYMBOL res 112 32 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R2
+SYMATTR Value 10k
+SYMBOL res 16 128 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R3
+SYMATTR Value 4.7k
+SYMBOL res 16 400 R90
+WINDOW 0 0 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+SYMATTR InstName R4
+SYMATTR Value 4.7k
+SYMBOL npn 64 368 R0
+SYMATTR InstName Q3
+SYMATTR Value 2N3904
+SYMBOL LED 0 336 R270
+WINDOW 0 72 32 VTop 2
+WINDOW 3 0 32 VBottom 2
+SYMATTR InstName D5
+SYMATTR Value LXHL-BW02
+SYMBOL res 112 480 R0
+SYMATTR InstName R5
+SYMATTR Value 2.7k
+SYMBOL res -352 0 R0
+SYMATTR InstName R6
+SYMATTR Value 330k
+SYMBOL res -352 144 R0
+SYMATTR InstName R7
+SYMATTR Value 5.6k
+TEXT 312 344 Left 2 !.include LM324.txt
+TEXT 312 392 Left 2 !.dc V2 0mV 400mV
diff --git a/ltspice/uv_led_driver/driver_option1.log b/ltspice/uv_led_driver/driver_option1.log
deleted file mode 100644
index f5e2b58..0000000
--- a/ltspice/uv_led_driver/driver_option1.log
+++ /dev/null
@@ -1,42 +0,0 @@
-Circuit: * Z:\home\maximilian\Etching\ltspice\uv_led_driver\driver_option1.asc
-
-V2: Missing value, assumed 0V @ DC
-Direct Newton iteration failed to find .op point.  (Use ".option noopiter" to skip.)
-Starting Gmin stepping
-Increasing initial diagonal Gmin to 100
-Gmin = 100
-vernier = 0.5
-vernier = 0.25
-vernier = 0.125
-Gmin = 49.6485
-vernier = 0.0625
-vernier = 0.03125
-vernier = 0.015625
-vernier = 0.0078125
-vernier = 0.00390625
-Gmin = 50.8031
-vernier = 0.00195313
-vernier = 0.000976563
-vernier = 0.000488281
-Gmin = 0
-Gmin = 0
-Gmin stepping succeeded in finding the operating point.
-
-
-Date: Sun Jun 18 13:47:21 2017
-Total elapsed time: 0.158 seconds.
-
-tnom = 27
-temp = 27
-method = trap
-totiter = 3546
-traniter = 0
-tranpoints = 0
-accept = 0
-rejected = 0
-matrix size = 40
-fillins = 74
-solver = Normal
-Matrix Compiler1:     285 opcodes  1.5/0.7/[0.5]
-Matrix Compiler2: 4.48 KB object code size  0.6/0.7/[0.4]
-
diff --git a/ltspice/uv_led_driver/driver_option1.net b/ltspice/uv_led_driver/driver_option1.net
deleted file mode 100644
index 09c453b..0000000
--- a/ltspice/uv_led_driver/driver_option1.net
+++ /dev/null
@@ -1,19 +0,0 @@
-* Z:\home\maximilian\Etching\ltspice\uv_led_driver\driver_option1.asc
-XU1 VSIG N005 V+ 0 N006 LM324
-V1 V+ 0 18V
-Q1 N004 N006 N005 0 2N3904
-V2 VSIG 0
-D1 N003 N004 LXHL-BW02
-R1 N005 0 10R
-D2 N002 N003 LXHL-BW02
-D3 N001 N002 LXHL-BW02
-D4 V+ N001 LXHL-BW02
-.model D D
-.lib C:\users\maximilian\My Documents\LTspiceXVII\lib\cmp\standard.dio
-.model NPN NPN
-.model PNP PNP
-.lib C:\users\maximilian\My Documents\LTspiceXVII\lib\cmp\standard.bjt
-.include LM324.txt
-.dc V2 0mV 300mV
-.backanno
-.end
diff --git a/ltspice/uv_led_driver/driver_option1.raw b/ltspice/uv_led_driver/driver_option1.raw
deleted file mode 100644
index 07593c4..0000000
Binary files a/ltspice/uv_led_driver/driver_option1.raw and /dev/null differ
diff --git a/ltspice/uv_led_driver/driver_option2.log b/ltspice/uv_led_driver/driver_option2.log
deleted file mode 100644
index 9b7ebd3..0000000
--- a/ltspice/uv_led_driver/driver_option2.log
+++ /dev/null
@@ -1,60 +0,0 @@
-Circuit: * Z:\home\maximilian\UppSense\ltspice\uv_led_driver\driver_option2.asc
-
-Early termination of direct N-R iteration.
-Direct Newton iteration failed to find .op point.  (Use ".option noopiter" to skip.)
-Starting Gmin stepping
-Gmin = 10
-vernier = 0.5
-vernier = 0.25
-Gmin = 2.62144
-vernier = 0.125
-vernier = 0.0625
-vernier = 0.03125
-Gmin = 2.39176
-vernier = 0.015625
-vernier = 0.0078125
-vernier = 0.00390625
-Gmin = 2.38938
-vernier = 0.00520833
-vernier = 0.00260417
-vernier = 0.00130208
-Gmin = 2.37466
-vernier = 0.00173611
-vernier = 0.00231481
-Gmin = 2.3642
-vernier = 0.00115741
-vernier = 0.000578703
-vernier = 0.000771604
-Gmin = 2.36158
-vernier = 0.00102881
-Gmin = 2.35612
-vernier = 0.00137174
-vernier = 0.00068587
-vernier = 0.000514403
-vernier = 0.00068587
-Gmin = 2.3538
-vernier = 0.000914493
-Gmin = 2.34896
-vernier = 0.00121932
-vernier = 0.000609662
-vernier = 0.000457246
-vernier = 0.000609662
-Gmin = 2.34691
-vernier = 0.000812882
-vernier = 0.000406441
-Singular matrix:  Check node v:u2:ln#branch
-   Iteration No. 2
-Gmin = 0
-Singular matrix:  Check node v:u2:ln#branch
-   Iteration No. 1
-Gmin stepping failed
-
-Starting source stepping with srcstepmethod=0
-Source Step = 3.0303%
-Source Step = 33.3333%
-Source Step = 63.6364%
-Source Step = 93.9394%
-Source stepping succeeded in finding the operating point.
-
-.step duty_cycle=1e-006
-.step duty_cycle=2e-006
diff --git a/ltspice/uv_led_driver/driver_option2.op.raw b/ltspice/uv_led_driver/driver_option2.op.raw
deleted file mode 100644
index 40a71d4..0000000
Binary files a/ltspice/uv_led_driver/driver_option2.op.raw and /dev/null differ
diff --git a/ltspice/uv_led_driver/driver_option2.raw b/ltspice/uv_led_driver/driver_option2.raw
deleted file mode 100644
index 1f16d8d..0000000
Binary files a/ltspice/uv_led_driver/driver_option2.raw and /dev/null differ
diff --git a/pcbs/.gitignore b/pcbs/.gitignore
new file mode 100644
index 0000000..e2930ba
--- /dev/null
+++ b/pcbs/.gitignore
@@ -0,0 +1,26 @@
+# Created by https://www.gitignore.io/api/kicad
+
+### KiCad ###
+# For PCBs designed using KiCad: http://www.kicad-pcb.org/
+
+# Temporary files
+*.000
+*.bak
+*.bck
+*.kicad_pcb-bak
+*~
+_autosave-*
+*.tmp
+
+# Netlist files (exported from Eeschema)
+*.net
+
+# Autorouter files (exported from Pcbnew)
+*.dsn
+*.ses
+
+# Exported BOM files
+*.xml
+*.csv
+
+# End of https://www.gitignore.io/api/kicad
diff --git a/pcbs/fourStages.sch b/pcbs/fourStages.sch
new file mode 100644
index 0000000..bf8993d
--- /dev/null
+++ b/pcbs/fourStages.sch
@@ -0,0 +1,340 @@
+EESchema Schematic File Version 2
+LIBS:power
+LIBS:device
+LIBS:transistors
+LIBS:conn
+LIBS:linear
+LIBS:regul
+LIBS:74xx
+LIBS:cmos4000
+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:valves
+LIBS:myOpAmps
+EELAYER 25 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 2 2
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L LM324DT U?
+U 1 1 5946A8EE
+P 5650 3325
+F 0 "U?" H 6100 2525 60  0000 C CNN
+F 1 "LM324DT" H 5300 2525 60  0000 C CNN
+F 2 "SMD_Packages:SOIC-14_N" H 5650 3325 60  0001 C CNN
+F 3 "http://www.farnell.com/datasheets/1834360.pdf" H 5650 3325 60  0001 C CNN
+F 4 "2382609" H 5650 3325 60  0001 C CNN "Franell"
+	1    5650 3325
+	1    0    0    -1  
+$EndComp
+$Comp
+L MMBT3904 Q?
+U 1 1 5946A8F6
+P 7675 4000
+F 0 "Q?" H 7875 4075 50  0000 L CNN
+F 1 "MMBT3904" H 7875 4000 50  0000 L CNN
+F 2 "SOT-23" H 7875 3925 50  0001 L CIN
+F 3 "http://www.nxp.com/packings/SOT23_215.html" H 7675 4000 50  0001 L CNN
+F 4 "1757936" H 7675 4000 60  0001 C CNN "Farnell"
+	1    7675 4000
+	1    0    0    1   
+$EndComp
+Text HLabel 7900 4300 2    60   Input ~ 0
+LED_NEG_3
+Wire Wire Line
+	7775 4200 7775 4300
+Wire Wire Line
+	7775 4300 7900 4300
+Text GLabel 6775 3525 2    60   Input ~ 0
+V_SIG
+Wire Wire Line
+	7775 3675 7775 3800
+Wire Wire Line
+	6350 3725 7775 3725
+Connection ~ 7775 3725
+Wire Wire Line
+	6350 3925 7475 3925
+Wire Wire Line
+	7475 3925 7475 4000
+Wire Wire Line
+	6350 3525 6775 3525
+$Comp
+L MMBT3904 Q?
+U 1 1 5946A90F
+P 3625 4000
+F 0 "Q?" H 3825 4075 50  0000 L CNN
+F 1 "MMBT3904" H 3825 4000 50  0000 L CNN
+F 2 "SOT-23" H 3825 3925 50  0001 L CIN
+F 3 "http://www.nxp.com/packings/SOT23_215.html" H 3625 4000 50  0001 L CNN
+F 4 "1757936" H 3625 4000 60  0001 C CNN "Farnell"
+	1    3625 4000
+	-1   0    0    1   
+$EndComp
+Text HLabel 3400 4300 0    60   Input ~ 0
+LED_NEG_2
+Wire Wire Line
+	3525 4200 3525 4300
+Wire Wire Line
+	3525 4300 3400 4300
+Text GLabel 4525 3525 0    60   Input ~ 0
+V_SIG
+Wire Wire Line
+	3525 3675 3525 3800
+Wire Wire Line
+	4950 3725 3525 3725
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+Wire Wire Line
+	4950 3925 3825 3925
+Wire Wire Line
+	3825 3925 3825 4000
+Wire Wire Line
+	4950 3525 4525 3525
+$Comp
+L MMBT3904 Q?
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+F 1 "MMBT3904" H 3825 2650 50  0000 L CNN
+F 2 "SOT-23" H 3825 2575 50  0001 L CIN
+F 3 "http://www.nxp.com/packings/SOT23_215.html" H 3625 2650 50  0001 L CNN
+F 4 "1757936" H 3625 2650 60  0001 C CNN "Farnell"
+	1    3625 2650
+	-1   0    0    -1  
+$EndComp
+Text HLabel 3400 2350 0    60   Input ~ 0
+LED_NEG_1
+Wire Wire Line
+	3525 2450 3525 2350
+Wire Wire Line
+	3525 2350 3400 2350
+Text GLabel 4525 3125 0    60   Input ~ 0
+V_SIG
+Wire Wire Line
+	3525 2850 3525 2975
+Wire Wire Line
+	4950 2925 3525 2925
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+Wire Wire Line
+	4950 2725 3825 2725
+Wire Wire Line
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+Wire Wire Line
+	4950 3125 4525 3125
+$Comp
+L MMBT3904 Q?
+U 1 1 5946A941
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+F 0 "Q?" H 7875 2725 50  0000 L CNN
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+F 3 "http://www.nxp.com/packings/SOT23_215.html" H 7675 2650 50  0001 L CNN
+F 4 "1757936" H 7675 2650 60  0001 C CNN "Farnell"
+	1    7675 2650
+	1    0    0    -1  
+$EndComp
+$Comp
+L R R?
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+F 3 "" H 7775 3125 50  0000 C CNN
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+	1    7775 3125
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+$EndComp
+Text HLabel 7900 2350 2    60   Input ~ 0
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diff --git a/pcbs/fourStages1.sch b/pcbs/fourStages1.sch
new file mode 100644
index 0000000..475c1df
--- /dev/null
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+LIBS:texas
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+LIBS:audio
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+LIBS:siliconi
+LIBS:opto
+LIBS:atmel
+LIBS:contrib
+LIBS:valves
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diff --git a/pcbs/fourStages2.sch b/pcbs/fourStages2.sch
new file mode 100644
index 0000000..c1b0ceb
--- /dev/null
+++ b/pcbs/fourStages2.sch
@@ -0,0 +1,372 @@
+EESchema Schematic File Version 2
+LIBS:power
+LIBS:device
+LIBS:transistors
+LIBS:conn
+LIBS:linear
+LIBS:regul
+LIBS:74xx
+LIBS:cmos4000
+LIBS:adc-dac
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+LIBS:analog_switches
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+LIBS:texas
+LIBS:intel
+LIBS:audio
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+LIBS:siliconi
+LIBS:opto
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+LIBS:contrib
+LIBS:valves
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+Text HLabel 3400 4300 0    60   Input ~ 0
+LED_NEG_2
+Wire Wire Line
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+Wire Wire Line
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+V_SIG
+Wire Wire Line
+	3525 3675 3525 3800
+Wire Wire Line
+	4950 3725 3525 3725
+Connection ~ 3525 3725
+Wire Wire Line
+	4950 3925 3825 3925
+Wire Wire Line
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+Wire Wire Line
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+$Comp
+L MMBT3904 Q1
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+AR Path="/5946A580/5946A928" Ref="Q1"  Part="1" 
+AR Path="/5946CB4D/5946A928" Ref="Q5"  Part="1" 
+F 0 "Q5" H 3825 2725 50  0000 L CNN
+F 1 "MMBT3904" H 3825 2650 50  0000 L CNN
+F 2 "SOT-23" H 3825 2575 50  0001 L CIN
+F 3 "http://www.nxp.com/packings/SOT23_215.html" H 3625 2650 50  0001 L CNN
+F 4 "1757936" H 3625 2650 60  0001 C CNN "Farnell"
+	1    3625 2650
+	-1   0    0    -1  
+$EndComp
+Text HLabel 3400 2350 0    60   Input ~ 0
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+Wire Wire Line
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+Wire Wire Line
+	4950 2925 3525 2925
+Connection ~ 3525 2925
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+Wire Wire Line
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+Wire Wire Line
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+L MMBT3904 Q3
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+AR Path="/5946CB4D/5946A941" Ref="Q7"  Part="1" 
+F 0 "Q7" H 7875 2725 50  0000 L CNN
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+F 2 "SOT-23" H 7875 2575 50  0001 L CIN
+F 3 "http://www.nxp.com/packings/SOT23_215.html" H 7675 2650 50  0001 L CNN
+F 4 "1757936" H 7675 2650 60  0001 C CNN "Farnell"
+	1    7675 2650
+	1    0    0    -1  
+$EndComp
+$Comp
+L R R3
+U 1 1 5946A948
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+AR Path="/5946A580/5946A948" Ref="R3"  Part="1" 
+AR Path="/5946CB4D/5946A948" Ref="R7"  Part="1" 
+F 0 "R7" V 7855 3125 50  0000 C CNN
+F 1 "10R" V 7775 3125 50  0000 C CNN
+F 2 "Resistors_SMD:R_0603" V 7705 3125 50  0001 C CNN
+F 3 "" H 7775 3125 50  0000 C CNN
+F 4 "2447233" V 7775 3125 60  0001 C CNN "Farnell"
+	1    7775 3125
+	-1   0    0    1   
+$EndComp
+Text HLabel 7900 2350 2    60   Input ~ 0
+LED_NEG_4
+Wire Wire Line
+	7775 2450 7775 2350
+Wire Wire Line
+	7775 2350 7900 2350
+Text GLabel 6775 3125 2    60   Input ~ 0
+V_SIG
+Wire Wire Line
+	7775 2850 7775 2975
+Wire Wire Line
+	6350 2925 7775 2925
+Connection ~ 7775 2925
+Wire Wire Line
+	6350 2725 7475 2725
+Wire Wire Line
+	7475 2725 7475 2650
+Wire Wire Line
+	6350 3125 6775 3125
+$Comp
+L GND #PWR01
+U 1 1 5946A959
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+AR Path="/5946A580/5946A959" Ref="#PWR01"  Part="1" 
+AR Path="/5946CB4D/5946A959" Ref="#PWR05"  Part="1" 
+F 0 "#PWR05" H 8025 3075 50  0001 C CNN
+F 1 "GND" H 8025 3175 50  0000 C CNN
+F 2 "" H 8025 3325 50  0000 C CNN
+F 3 "" H 8025 3325 50  0000 C CNN
+	1    8025 3325
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 7775 3325
+$Comp
+L GND #PWR02
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+AR Path="/5946A580/5946A962" Ref="#PWR02"  Part="1" 
+AR Path="/5946CB4D/5946A962" Ref="#PWR06"  Part="1" 
+F 0 "#PWR06" H 3275 3075 50  0001 C CNN
+F 1 "GND" H 3275 3175 50  0000 C CNN
+F 2 "" H 3275 3325 50  0000 C CNN
+F 3 "" H 3275 3325 50  0000 C CNN
+	1    3275 3325
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	3525 3275 3525 3375
+Wire Wire Line
+	3275 3325 3525 3325
+Connection ~ 3525 3325
+$Comp
+L GND #PWR03
+U 1 1 5946A96B
+P 6425 3325
+AR Path="/5946A580/5946A96B" Ref="#PWR03"  Part="1" 
+AR Path="/5946CB4D/5946A96B" Ref="#PWR07"  Part="1" 
+F 0 "#PWR07" H 6425 3075 50  0001 C CNN
+F 1 "GND" H 6425 3175 50  0000 C CNN
+F 2 "" H 6425 3325 50  0000 C CNN
+F 3 "" H 6425 3325 50  0000 C CNN
+	1    6425 3325
+	1    0    0    -1  
+$EndComp
+Text GLabel 4875 3325 0    60   Input ~ 0
+Vcc
+Wire Wire Line
+	4875 3325 4950 3325
+Wire Wire Line
+	6350 3325 6425 3325
+$Comp
+L R R4
+U 1 1 5946AF96
+P 7775 3525
+AR Path="/5946A580/5946AF96" Ref="R4"  Part="1" 
+AR Path="/5946CB4D/5946AF96" Ref="R8"  Part="1" 
+F 0 "R8" V 7855 3525 50  0000 C CNN
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+F 3 "" H 7775 3525 50  0000 C CNN
+F 4 "2447233" V 7775 3525 60  0001 C CNN "Farnell"
+	1    7775 3525
+	-1   0    0    1   
+$EndComp
+$Comp
+L R R1
+U 1 1 5946B03F
+P 3525 3125
+AR Path="/5946A580/5946B03F" Ref="R1"  Part="1" 
+AR Path="/5946CB4D/5946B03F" Ref="R5"  Part="1" 
+F 0 "R5" V 3605 3125 50  0000 C CNN
+F 1 "10R" V 3525 3125 50  0000 C CNN
+F 2 "Resistors_SMD:R_0603" V 3455 3125 50  0001 C CNN
+F 3 "" H 3525 3125 50  0000 C CNN
+F 4 "2447233" V 3525 3125 60  0001 C CNN "Farnell"
+	1    3525 3125
+	-1   0    0    1   
+$EndComp
+$Comp
+L R R2
+U 1 1 5946B10D
+P 3525 3525
+AR Path="/5946A580/5946B10D" Ref="R2"  Part="1" 
+AR Path="/5946CB4D/5946B10D" Ref="R6"  Part="1" 
+F 0 "R6" V 3605 3525 50  0000 C CNN
+F 1 "10R" V 3525 3525 50  0000 C CNN
+F 2 "Resistors_SMD:R_0603" V 3455 3525 50  0001 C CNN
+F 3 "" H 3525 3525 50  0000 C CNN
+F 4 "2447233" V 3525 3525 60  0001 C CNN "Farnell"
+	1    3525 3525
+	-1   0    0    1   
+$EndComp
+$Comp
+L C C1
+U 1 1 5946B2F2
+P 3450 1350
+AR Path="/5946A580/5946B2F2" Ref="C1"  Part="1" 
+AR Path="/5946CB4D/5946B2F2" Ref="C4"  Part="1" 
+F 0 "C4" H 3475 1450 50  0000 L CNN
+F 1 "1u" H 3475 1250 50  0000 L CNN
+F 2 "Resistors_SMD:R_0603" H 3488 1200 50  0001 C CNN
+F 3 "" H 3450 1350 50  0000 C CNN
+F 4 "2496916" H 3450 1350 60  0001 C CNN "Farnell"
+	1    3450 1350
+	1    0    0    -1  
+$EndComp
+$Comp
+L C C2
+U 1 1 5946B377
+P 3775 1350
+AR Path="/5946A580/5946B377" Ref="C2"  Part="1" 
+AR Path="/5946CB4D/5946B377" Ref="C5"  Part="1" 
+F 0 "C5" H 3800 1450 50  0000 L CNN
+F 1 "100n" H 3800 1250 50  0000 L CNN
+F 2 "Resistors_SMD:R_0603" H 3813 1200 50  0001 C CNN
+F 3 "" H 3775 1350 50  0000 C CNN
+F 4 "2496834" H 3775 1350 60  0001 C CNN "Farnell"
+	1    3775 1350
+	1    0    0    -1  
+$EndComp
+$Comp
+L C C3
+U 1 1 5946B3BE
+P 4075 1350
+AR Path="/5946A580/5946B3BE" Ref="C3"  Part="1" 
+AR Path="/5946CB4D/5946B3BE" Ref="C6"  Part="1" 
+F 0 "C6" H 4100 1450 50  0000 L CNN
+F 1 "10n" H 4100 1250 50  0000 L CNN
+F 2 "Resistors_SMD:R_0603" H 4113 1200 50  0001 C CNN
+F 3 "" H 4075 1350 50  0000 C CNN
+F 4 "1414609" H 4075 1350 60  0001 C CNN "Farnell"
+	1    4075 1350
+	1    0    0    -1  
+$EndComp
+$Comp
+L GND #PWR04
+U 1 1 5946B480
+P 4075 1575
+AR Path="/5946A580/5946B480" Ref="#PWR04"  Part="1" 
+AR Path="/5946CB4D/5946B480" Ref="#PWR08"  Part="1" 
+F 0 "#PWR08" H 4075 1325 50  0001 C CNN
+F 1 "GND" H 4075 1425 50  0000 C CNN
+F 2 "" H 4075 1575 50  0000 C CNN
+F 3 "" H 4075 1575 50  0000 C CNN
+	1    4075 1575
+	1    0    0    -1  
+$EndComp
+Text GLabel 3075 1200 0    60   Input ~ 0
+Vcc
+Wire Wire Line
+	3075 1200 4075 1200
+Connection ~ 3450 1200
+Connection ~ 3775 1200
+Wire Wire Line
+	3450 1500 4075 1500
+Connection ~ 3775 1500
+Connection ~ 4075 1500
+Wire Wire Line
+	4075 1500 4075 1575
+Text Notes 2850 975  0    60   ~ 0
+Place decoupling capacitors close to IC.
+$EndSCHEMATC
diff --git a/electronics/led_driver-cache.lib b/pcbs/led_driver-cache.lib
similarity index 51%
rename from electronics/led_driver-cache.lib
rename to pcbs/led_driver-cache.lib
index d87d98f..e7f0d03 100644
--- a/electronics/led_driver-cache.lib
+++ b/pcbs/led_driver-cache.lib
@@ -1,6 +1,86 @@
 EESchema-LIBRARY Version 2.3
 #encoding utf-8
 #
+# BARREL_JACK
+#
+DEF BARREL_JACK CON 0 40 Y Y 1 F N
+F0 "CON" 0 250 50 H V C CNN
+F1 "BARREL_JACK" 0 -200 50 H V C CNN
+F2 "" 0 0 50 H V C CNN
+F3 "" 0 0 50 H V C CNN
+DRAW
+A -300 99 49 -900 1788 0 1 0 N -300 50 -350 100
+A -300 101 49 900 -1788 0 1 0 N -300 150 -350 100
+S 100 150 0 50 0 1 0 N
+P 2 0 1 0 -300 50 0 50 N
+P 2 0 1 0 0 150 -300 150 N
+P 3 0 1 0 100 0 -50 0 -50 -100 N
+P 5 0 1 0 100 -100 -150 -100 -200 -50 -250 -100 -350 -100 N
+X ~ 1 300 100 200 L 50 50 1 1 P
+X ~ 2 300 -100 200 L 50 50 1 1 P
+X ~ 3 300 0 200 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# C
+#
+DEF C C 0 10 N Y 1 F N
+F0 "C" 25 100 50 H V L CNN
+F1 "C" 25 -100 50 H V L CNN
+F2 "" 38 -150 50 H V C CNN
+F3 "" 0 0 50 H V C CNN
+$FPLIST
+ C?
+ C_????_*
+ C_????
+ SMD*_c
+ Capacitor*
+$ENDFPLIST
+DRAW
+P 2 0 1 20 -80 -30 80 -30 N
+P 2 0 1 20 -80 30 80 30 N
+X ~ 1 0 150 110 D 50 50 1 1 P
+X ~ 2 0 -150 110 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# CONN_01X03
+#
+DEF CONN_01X03 P 0 40 Y N 1 F N
+F0 "P" 0 200 50 H V C CNN
+F1 "CONN_01X03" 100 0 50 V V C CNN
+F2 "" 0 0 50 H V C CNN
+F3 "" 0 0 50 H V C CNN
+$FPLIST
+ Pin_Header_Straight_1X03
+ Pin_Header_Angled_1X03
+ Socket_Strip_Straight_1X03
+ Socket_Strip_Angled_1X03
+$ENDFPLIST
+DRAW
+S -50 -95 10 -105 0 1 0 N
+S -50 5 10 -5 0 1 0 N
+S -50 105 10 95 0 1 0 N
+S -50 150 50 -150 0 1 0 N
+X P1 1 -200 100 150 R 50 50 1 1 P
+X P2 2 -200 0 150 R 50 50 1 1 P
+X P3 3 -200 -100 150 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# GND
+#
+DEF GND #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "GND" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H V C CNN
+F3 "" 0 0 50 H V C CNN
+DRAW
+P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
+X GND 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
 # LM324DT
 #
 DEF LM324DT U 0 40 Y N 1 F N
@@ -76,4 +156,35 @@ X C 3 100 200 100 D 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
+# PWR_FLAG
+#
+DEF PWR_FLAG #FLG 0 0 N N 1 F P
+F0 "#FLG" 0 95 50 H I C CNN
+F1 "PWR_FLAG" 0 180 50 H V C CNN
+F2 "" 0 0 50 H V C CNN
+F3 "" 0 0 50 H V C CNN
+DRAW
+X pwr 1 0 0 0 U 50 50 0 0 w
+P 6 0 1 0 0 0 0 50 -75 100 0 150 75 100 0 50 N
+ENDDRAW
+ENDDEF
+#
+# R
+#
+DEF R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V V C CNN
+F3 "" 0 0 50 H V C CNN
+$FPLIST
+ R_*
+ Resistor_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 #End Library
diff --git a/electronics/led_driver.kicad_pcb b/pcbs/led_driver.kicad_pcb
similarity index 100%
rename from electronics/led_driver.kicad_pcb
rename to pcbs/led_driver.kicad_pcb
diff --git a/electronics/led_driver.pro b/pcbs/led_driver.pro
similarity index 100%
rename from electronics/led_driver.pro
rename to pcbs/led_driver.pro
diff --git a/pcbs/led_driver.sch b/pcbs/led_driver.sch
new file mode 100644
index 0000000..1c3e68d
--- /dev/null
+++ b/pcbs/led_driver.sch
@@ -0,0 +1,171 @@
+EESchema Schematic File Version 2
+LIBS:power
+LIBS:device
+LIBS:transistors
+LIBS:conn
+LIBS:linear
+LIBS:regul
+LIBS:74xx
+LIBS:cmos4000
+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:valves
+LIBS:myOpAmps
+EELAYER 25 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 2
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Sheet
+S 3600 2375 1200 1125
+U 5946A580
+F0 "fourStages1" 60
+F1 "fourStages1.sch" 60
+F2 "LED_NEG_3" I L 3600 3000 60 
+F3 "LED_NEG_1" I L 3600 2600 60 
+F4 "LED_NEG_4" I L 3600 3200 60 
+F5 "LED_NEG_2" I L 3600 2800 60 
+$EndSheet
+$Comp
+L BARREL_JACK CON?
+U 1 1 59468F94
+P 1900 1400
+F 0 "CON?" H 1900 1650 50  0000 C CNN
+F 1 "BARREL_JACK" H 1900 1200 50  0000 C CNN
+F 2 "" H 1900 1400 50  0000 C CNN
+F 3 "" H 1900 1400 50  0000 C CNN
+	1    1900 1400
+	1    0    0    -1  
+$EndComp
+Text GLabel 2725 1300 2    60   Output ~ 0
+Vcc
+Wire Wire Line
+	2200 1300 2725 1300
+$Comp
+L PWR_FLAG #FLG?
+U 1 1 5946963E
+P 2350 1175
+F 0 "#FLG?" H 2350 1270 50  0001 C CNN
+F 1 "PWR_FLAG" H 2350 1355 50  0000 C CNN
+F 2 "" H 2350 1175 50  0000 C CNN
+F 3 "" H 2350 1175 50  0000 C CNN
+	1    2350 1175
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2350 1175 2350 1300
+Connection ~ 2350 1300
+$Comp
+L GND #PWR?
+U 1 1 594697AB
+P 2700 1625
+F 0 "#PWR?" H 2700 1375 50  0001 C CNN
+F 1 "GND" H 2700 1475 50  0000 C CNN
+F 2 "" H 2700 1625 50  0000 C CNN
+F 3 "" H 2700 1625 50  0000 C CNN
+	1    2700 1625
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2200 1500 2700 1500
+Wire Wire Line
+	2700 1500 2700 1625
+Wire Wire Line
+	2200 1400 2350 1400
+Wire Wire Line
+	2350 1400 2350 1600
+Connection ~ 2350 1500
+$Comp
+L PWR_FLAG #FLG?
+U 1 1 59469875
+P 2350 1600
+F 0 "#FLG?" H 2350 1695 50  0001 C CNN
+F 1 "PWR_FLAG" H 2350 1780 50  0000 C CNN
+F 2 "" H 2350 1600 50  0000 C CNN
+F 3 "" H 2350 1600 50  0000 C CNN
+	1    2350 1600
+	-1   0    0    1   
+$EndComp
+$Comp
+L R R?
+U 1 1 5946A551
+P 6425 1150
+F 0 "R?" V 6505 1150 50  0000 C CNN
+F 1 "160k" V 6425 1150 50  0000 C CNN
+F 2 "" V 6355 1150 50  0000 C CNN
+F 3 "" H 6425 1150 50  0000 C CNN
+	1    6425 1150
+	1    0    0    -1  
+$EndComp
+$Comp
+L CONN_01X03 P?
+U 1 1 5946AAD6
+P 7900 1250
+F 0 "P?" H 7900 1450 50  0000 C CNN
+F 1 "CONN_01X03" V 8000 1250 50  0000 C CNN
+F 2 "" H 7900 1250 50  0000 C CNN
+F 3 "" H 7900 1250 50  0000 C CNN
+	1    7900 1250
+	1    0    0    -1  
+$EndComp
+$Comp
+L R R?
+U 1 1 5946AB9F
+P 6425 1575
+F 0 "R?" V 6505 1575 50  0000 C CNN
+F 1 "1.8k" V 6425 1575 50  0000 C CNN
+F 2 "" V 6355 1575 50  0000 C CNN
+F 3 "" H 6425 1575 50  0000 C CNN
+	1    6425 1575
+	1    0    0    -1  
+$EndComp
+$Comp
+L CONN_01X03 P?
+U 1 1 5946AC97
+P 8250 1250
+F 0 "P?" H 8250 1450 50  0000 C CNN
+F 1 "CONN_01X03" V 8350 1250 50  0000 C CNN
+F 2 "" H 8250 1250 50  0000 C CNN
+F 3 "" H 8250 1250 50  0000 C CNN
+	1    8250 1250
+	-1   0    0    -1  
+$EndComp
+Text GLabel 8725 1250 2    60   Output ~ 0
+VSIG
+Wire Wire Line
+	8725 1250 8450 1250
+Wire Wire Line
+	8450 1150 8575 1150
+Wire Wire Line
+	8575 1150 8575 1350
+Connection ~ 8575 1250
+Wire Wire Line
+	8575 1350 8450 1350
+$EndSCHEMATC
diff --git a/electronics/schematicLibs/myOpAmps.dcm b/pcbs/schematicLibs/myOpAmps.dcm
similarity index 100%
rename from electronics/schematicLibs/myOpAmps.dcm
rename to pcbs/schematicLibs/myOpAmps.dcm
diff --git a/electronics/schematicLibs/myOpAmps.lib b/pcbs/schematicLibs/myOpAmps.lib
similarity index 100%
rename from electronics/schematicLibs/myOpAmps.lib
rename to pcbs/schematicLibs/myOpAmps.lib