diff --git a/simulation/NernstSenseModel.asc b/simulation/NernstSenseModel.asc
index 1ab9f4d..2ed5a0c 100644
--- a/simulation/NernstSenseModel.asc
+++ b/simulation/NernstSenseModel.asc
@@ -66,7 +66,8 @@ WIRE 112 160 48 160
 WIRE 144 160 112 160
 WIRE 240 160 144 160
 WIRE 368 160 320 160
-WIRE 1616 160 368 160
+WIRE 496 160 368 160
+WIRE 1616 160 496 160
 WIRE 1824 160 1824 112
 WIRE 1824 160 1696 160
 WIRE -128 176 -128 160
@@ -104,6 +105,7 @@ FLAG 144 160 Vm
 FLAG 368 256 0
 FLAG 16 192 0
 FLAG 16 128 vcc
+FLAG 496 160 Vm_ext
 SYMBOL voltage -160 160 R90
 WINDOW 0 -32 56 VBottom 2
 WINDOW 3 32 56 VTop 2
@@ -118,7 +120,7 @@ SYMBOL voltage 1824 16 R0
 WINDOW 123 0 0 Left 0
 WINDOW 39 0 0 Left 0
 SYMATTR InstName V2
-SYMATTR Value SINE(0.5 0.5 100)
+SYMATTR Value 0.45
 SYMBOL res 1808 -96 R0
 SYMATTR InstName R2
 SYMATTR Value 300
@@ -127,14 +129,14 @@ SYMATTR InstName C1
 SYMATTR Value 100n
 SYMBOL res 1264 -432 R0
 SYMATTR InstName R3
-SYMATTR Value 23k
+SYMATTR Value 22k
 SYMBOL voltage 1280 -432 R180
 WINDOW 0 24 96 Left 2
 WINDOW 3 -471 57 Left 2
 WINDOW 123 0 0 Left 0
 WINDOW 39 0 0 Left 0
 SYMATTR InstName V4
-SYMATTR Value PULSE(0 3.3 10m 30n 30n 250u 500u)
+SYMATTR Value PULSE(0 3.3 10m 100n 100n 250u 500u)
 SYMBOL res 1808 544 R0
 SYMATTR InstName R5
 SYMATTR Value 95
diff --git a/simulation/PumpDriverModel.asc b/simulation/PumpDriverModel.asc
index 06286f3..26c10a4 100644
--- a/simulation/PumpDriverModel.asc
+++ b/simulation/PumpDriverModel.asc
@@ -1,7 +1,6 @@
 Version 4
 SHEET 1 1588 912
 WIRE -640 -192 -848 -192
-WIRE -368 -192 -400 -192
 WIRE -400 -176 -400 -192
 WIRE -400 -176 -576 -176
 WIRE -368 -176 -368 -192
@@ -36,6 +35,7 @@ WIRE 16 272 16 176
 WIRE 112 272 16 272
 WIRE 352 272 352 256
 WIRE 352 272 192 272
+WIRE -368 304 -400 304
 WIRE 992 304 928 304
 WIRE 1152 304 1072 304
 WIRE -912 320 -976 320
@@ -55,7 +55,6 @@ WIRE 608 400 608 384
 WIRE 880 416 880 384
 WIRE 928 416 928 304
 WIRE 928 416 880 416
-WIRE 1008 416 928 416
 WIRE 1152 432 1152 304
 WIRE 1152 432 1072 432
 WIRE 1200 432 1152 432
@@ -133,10 +132,10 @@ SYMATTR InstName V1
 SYMATTR Value 1.65
 SYMBOL voltage -816 320 R90
 WINDOW 0 -16 56 Left 2
-WINDOW 3 96 -151 VRight 2
+WINDOW 3 -16 84 Left 2
 WINDOW 39 0 0 Left 0
 SYMATTR InstName V2
-SYMATTR Value ""
+SYMATTR Value 0
 SYMATTR Value2 AC 1
 SYMBOL voltage -864 608 R0
 WINDOW 123 0 0 Left 0
@@ -185,8 +184,8 @@ SYMBOL voltage -848 -80 R0
 WINDOW 3 24 44 Left 2
 WINDOW 123 0 0 Left 0
 WINDOW 39 0 0 Left 0
-SYMATTR InstName V4
 SYMATTR Value PULSE(-0.3 0.3 5m 30n 30n 5m 10m)
+SYMATTR InstName V4
 SYMBOL voltage -832 -192 R90
 WINDOW 0 -32 56 VBottom 2
 WINDOW 3 32 56 VTop 2
@@ -202,10 +201,17 @@ SYMATTR Value 3.3k
 SYMBOL cap 1312 432 R0
 SYMATTR InstName C4
 SYMATTR Value 100n
-TEXT -712 364 Left 2 !;.ac dec 400 10 1e7
+SYMBOL voltage 1024 416 R90
+WINDOW 0 -32 56 VBottom 2
+WINDOW 3 32 56 VTop 2
+WINDOW 123 0 0 Left 0
+WINDOW 39 0 0 Left 0
+SYMATTR InstName V6
+SYMATTR Value 1m
+TEXT -712 368 Left 2 !;.ac dec 400 10 1e7
 TEXT -824 -272 Left 2 ;PWM modulator - transient analysis
 TEXT -960 232 Left 2 ;AC analysis
-TEXT -642 -12 Left 2 !.tran 50m
+TEXT -640 -16 Left 2 !.dc V6 -5m 5m
 TEXT -856 552 Left 2 ;Power Supply
 TEXT 1320 256 Left 2 ;Pump Current Sense
 TEXT 160 -176 Left 2 ;Pump Current Source