Remove INA126 because it doesn't work in this configuration. Replace by old subtractor circuit

2020-01-11 20:22:02 +01:00 · 2020-01-11 20:22:02 +01:00 · dda1209659
commit dda1209659
parent f895e84418
2 changed files with 465 additions and 154 deletions
--- a/frontend.sch
+++ b/frontend.sch
@ -19,7 +19,7 @@ U 1 1 5D8C684C
 P 3450 1400
 F 0 "U204" H 3350 1400 50  0000 L CNN
 F 1 "MCP6V31U" H 3450 1200 50  0000 L CNN
-F 2 "Package_TO_SOT_SMD:SOT-23-5_HandSoldering" H 3450 1400 50  0001 L CNN
+F 2 "Package_TO_SOT_SMD:SOT-353_SC-70-5" H 3450 1400 50  0001 L CNN
 F 3 "http://ww1.microchip.com/downloads/en/devicedoc/22229d.pdf" H 3450 1400 50  0001 C CNN
 	1    3450 1400
 	1    0    0    -1  
@ -366,75 +366,73 @@ VREF
 Text Label 9150 1050 0    50   ~ 0
 VREF
 Wire Wire Line
-	2650 3500 2650 3550
+	1700 3200 1700 3250
 Wire Wire Line
-	2650 3550 2800 3550
-Connection ~ 2650 3550
+	1700 3250 1850 3250
+Connection ~ 1700 3250
 Wire Wire Line
-	2650 3550 2650 3600
+	1700 3250 1700 3300
 $Comp
 L Device:C C205
 U 1 1 5DA18039
-P 2950 3550
-F 0 "C205" V 2698 3550 50  0000 C CNN
-F 1 "100n" V 2789 3550 50  0000 C CNN
-F 2 "Capacitor_SMD:C_0603_1608Metric" H 2988 3400 50  0001 C CNN
-F 3 "~" H 2950 3550 50  0001 C CNN
-	1    2950 3550
+P 2000 3250
+F 0 "C205" V 1748 3250 50  0000 C CNN
+F 1 "100n" V 1839 3250 50  0000 C CNN
+F 2 "Capacitor_SMD:C_0603_1608Metric" H 2038 3100 50  0001 C CNN
+F 3 "~" H 2000 3250 50  0001 C CNN
+	1    2000 3250
 	0    1    1    0   
 $EndComp
 Wire Wire Line
-	3100 3550 3250 3550
+	2150 3250 2300 3250
 Wire Wire Line
-	3250 3550 3250 3600
-Text Label 1600 3700 0    50   ~ 0
+	2300 3250 2300 3300
+Text Label 750  3500 0    50   ~ 0
 S+
-Text Label 1600 4100 0    50   ~ 0
-S-
 Wire Wire Line
-	4250 3900 4250 3650
+	6250 3900 6250 3650
 $Comp
 L power:+3V3 #PWR0214
 U 1 1 5DB05D58
-P 4250 3300
-F 0 "#PWR0214" H 4250 3150 50  0001 C CNN
-F 1 "+3V3" H 4265 3473 50  0000 C CNN
-F 2 "" H 4250 3300 50  0001 C CNN
-F 3 "" H 4250 3300 50  0001 C CNN
-	1    4250 3300
+P 6250 3300
+F 0 "#PWR0214" H 6250 3150 50  0001 C CNN
+F 1 "+3V3" H 6265 3473 50  0000 C CNN
+F 2 "" H 6250 3300 50  0001 C CNN
+F 3 "" H 6250 3300 50  0001 C CNN
+	1    6250 3300
 	1    0    0    -1  
 $EndComp
 $Comp
 L Diode:1N4448W D201
 U 1 1 5DB075CB
-P 4250 3500
-F 0 "D201" V 4204 3580 50  0000 L CNN
-F 1 "1N4448W" V 4295 3580 50  0000 L CNN
-F 2 "Diode_SMD:D_SOD-123" H 4250 3325 50  0001 C CNN
-F 3 "https://www.vishay.com/docs/85722/1n4448w.pdf" H 4250 3500 50  0001 C CNN
-	1    4250 3500
+P 6250 3500
+F 0 "D201" V 6204 3580 50  0000 L CNN
+F 1 "1N4448W" V 6295 3580 50  0000 L CNN
+F 2 "Diode_SMD:D_SOD-123" H 6250 3325 50  0001 C CNN
+F 3 "https://www.vishay.com/docs/85722/1n4448w.pdf" H 6250 3500 50  0001 C CNN
+	1    6250 3500
 	0    1    1    0   
 $EndComp
 Wire Wire Line
-	4250 3350 4250 3300
+	6250 3350 6250 3300
 $Comp
 L Device:R R206
 U 1 1 5DB0C2DA
-P 4050 3900
-F 0 "R206" V 3843 3900 50  0000 C CNN
-F 1 "10" V 3934 3900 50  0000 C CNN
-F 2 "Resistor_SMD:R_0603_1608Metric" V 3980 3900 50  0001 C CNN
-F 3 "~" H 4050 3900 50  0001 C CNN
-	1    4050 3900
+P 6050 3900
+F 0 "R206" V 5843 3900 50  0000 C CNN
+F 1 "10" V 5934 3900 50  0000 C CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 5980 3900 50  0001 C CNN
+F 3 "~" H 6050 3900 50  0001 C CNN
+	1    6050 3900
 	0    1    1    0   
 $EndComp
-Text HLabel 4900 3900 2    50   Output ~ 0
+Text HLabel 6900 3900 2    50   Output ~ 0
 TEMP_OUT
 Wire Wire Line
-	4200 3900 4250 3900
-Connection ~ 4250 3900
+	6200 3900 6250 3900
+Connection ~ 6250 3900
 Wire Wire Line
-	4250 3900 4900 3900
+	6250 3900 6900 3900
 $Comp
 L power:+5VA #PWR0201
 U 1 1 5D89CDE5
@ -460,12 +458,12 @@ $EndComp
 $Comp
 L power:+5VA #PWR0207
 U 1 1 5D8A308A
-P 2650 3500
-F 0 "#PWR0207" H 2650 3350 50  0001 C CNN
-F 1 "+5VA" H 2665 3673 50  0000 C CNN
-F 2 "" H 2650 3500 50  0001 C CNN
-F 3 "" H 2650 3500 50  0001 C CNN
-	1    2650 3500
+P 1700 3200
+F 0 "#PWR0207" H 1700 3050 50  0001 C CNN
+F 1 "+5VA" H 1715 3373 50  0000 C CNN
+F 2 "" H 1700 3200 50  0001 C CNN
+F 3 "" H 1700 3200 50  0001 C CNN
+	1    1700 3200
 	1    0    0    -1  
 $EndComp
 $Comp
@ -878,109 +876,49 @@ Wire Wire Line
 Wire Wire Line
 	8000 5100 8350 5100
 Connection ~ 8350 5100
-$Comp
-L Amplifier_Instrumentation:INA128 U203
-U 1 1 5E153C60
-P 2650 3900
-F 0 "U203" H 3094 3946 50  0000 L CNN
-F 1 "INA126" H 3094 3855 50  0000 L CNN
-F 2 "Package_SO:SO-8_3.9x4.9mm_P1.27mm" H 2750 3900 50  0001 C CNN
-F 3 "http://www.ti.com/lit/ds/symlink/ina128.pdf" H 2750 3900 50  0001 C CNN
-	1    2650 3900
-	1    0    0    -1  
-$EndComp
 Wire Wire Line
-	3050 3900 3900 3900
-$Comp
-L Device:R R202
-U 1 1 5E17F6CD
-P 2000 3900
-F 0 "R202" H 2070 3946 50  0000 L CNN
-F 1 "16k" H 2070 3855 50  0000 L CNN
-F 2 "Resistor_SMD:R_0603_1608Metric" V 1930 3900 50  0001 C CNN
-F 3 "~" H 2000 3900 50  0001 C CNN
-	1    2000 3900
-	1    0    0    -1  
-$EndComp
-Wire Wire Line
-	1600 3700 2350 3700
-Wire Wire Line
-	2350 4100 1600 4100
-Wire Wire Line
-	2000 4050 2300 4050
-Wire Wire Line
-	2300 4050 2300 4000
-Wire Wire Line
-	2300 4000 2350 4000
-Wire Wire Line
-	2350 3800 2300 3800
-Wire Wire Line
-	2300 3800 2300 3750
-Wire Wire Line
-	2300 3750 2000 3750
-Wire Wire Line
-	2650 4200 2650 4250
-Wire Wire Line
-	2650 4250 2700 4250
-Wire Wire Line
-	2750 4250 2750 4200
-Wire Wire Line
-	2700 4250 2700 4350
-Connection ~ 2700 4250
-Wire Wire Line
-	2700 4250 2750 4250
-$Comp
-L power:GND #PWR0208
-U 1 1 5E1B0C0A
-P 2700 4350
-F 0 "#PWR0208" H 2700 4100 50  0001 C CNN
-F 1 "GND" H 2705 4177 50  0000 C CNN
-F 2 "" H 2700 4350 50  0001 C CNN
-F 3 "" H 2700 4350 50  0001 C CNN
-	1    2700 4350
-	1    0    0    -1  
-$EndComp
+	750  3500 1500 3500
 $Comp
 L power:GND #PWR0210
 U 1 1 5E1B21BD
-P 3250 3600
-F 0 "#PWR0210" H 3250 3350 50  0001 C CNN
-F 1 "GND" H 3255 3427 50  0000 C CNN
-F 2 "" H 3250 3600 50  0001 C CNN
-F 3 "" H 3250 3600 50  0001 C CNN
-	1    3250 3600
+P 2300 3300
+F 0 "#PWR0210" H 2300 3050 50  0001 C CNN
+F 1 "GND" H 2305 3127 50  0000 C CNN
+F 2 "" H 2300 3300 50  0001 C CNN
+F 3 "" H 2300 3300 50  0001 C CNN
+	1    2300 3300
 	1    0    0    -1  
 $EndComp
-Text Label 4400 3900 0    50   ~ 0
+Text Label 6400 3900 0    50   ~ 0
 TEMP_OUT
 Text Label 9550 5750 2    50   ~ 0
 TEMP_OUT
 $Comp
 L Device:C C208
 U 1 1 5E2394E4
-P 4250 4100
-F 0 "C208" V 4502 4100 50  0000 C CNN
-F 1 "1u" V 4411 4100 50  0000 C CNN
-F 2 "Capacitor_SMD:C_0603_1608Metric" H 4288 3950 50  0001 C CNN
-F 3 "~" H 4250 4100 50  0001 C CNN
-	1    4250 4100
+P 6250 4100
+F 0 "C208" V 6502 4100 50  0000 C CNN
+F 1 "1u" V 6411 4100 50  0000 C CNN
+F 2 "Capacitor_SMD:C_0603_1608Metric" H 6288 3950 50  0001 C CNN
+F 3 "~" H 6250 4100 50  0001 C CNN
+	1    6250 4100
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	4250 4250 4250 4350
+	6250 4250 6250 4350
 $Comp
 L power:GND #PWR0215
 U 1 1 5E241AC0
-P 4250 4350
-F 0 "#PWR0215" H 4250 4100 50  0001 C CNN
-F 1 "GND" H 4255 4177 50  0000 C CNN
-F 2 "" H 4250 4350 50  0001 C CNN
-F 3 "" H 4250 4350 50  0001 C CNN
-	1    4250 4350
+P 6250 4350
+F 0 "#PWR0215" H 6250 4100 50  0001 C CNN
+F 1 "GND" H 6255 4177 50  0000 C CNN
+F 2 "" H 6250 4350 50  0001 C CNN
+F 3 "" H 6250 4350 50  0001 C CNN
+	1    6250 4350
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	4250 3950 4250 3900
+	6250 3950 6250 3900
 Wire Notes Line
 	3800 5750 6500 5750
 Wire Notes Line
@ -1009,7 +947,7 @@ U 1 1 5E115D94
 P 1600 1300
 F 0 "U202" H 1500 1300 50  0000 L CNN
 F 1 "MCP6V31U" H 1600 1100 50  0000 L CNN
-F 2 "Package_TO_SOT_SMD:SOT-23-5_HandSoldering" H 1600 1300 50  0001 L CNN
+F 2 "Package_TO_SOT_SMD:SOT-353_SC-70-5" H 1600 1300 50  0001 L CNN
 F 3 "http://ww1.microchip.com/downloads/en/devicedoc/22229d.pdf" H 1600 1300 50  0001 C CNN
 	1    1600 1300
 	1    0    0    -1  
@ -1129,4 +1067,402 @@ Wire Wire Line
 Connection ~ 8700 4700
 Wire Wire Line
 	9050 4700 9700 4700
+$Comp
+L Amplifier_Operational:MCP6401UT-xOT U208
+U 1 1 5E224826
+P 1800 3600
+F 0 "U208" H 1700 3600 50  0000 L CNN
+F 1 "MCP6V31U" H 1800 3400 50  0000 L CNN
+F 2 "Package_TO_SOT_SMD:SOT-353_SC-70-5" H 1800 3600 50  0001 L CNN
+F 3 "http://ww1.microchip.com/downloads/en/devicedoc/22229d.pdf" H 1800 3600 50  0001 C CNN
+	1    1800 3600
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1500 3700 1300 3700
+Wire Wire Line
+	1300 3700 1300 4100
+Wire Wire Line
+	1300 4100 2450 4100
+Wire Wire Line
+	2450 4100 2450 4000
+$Comp
+L Device:C C218
+U 1 1 5E232923
+P 2450 3850
+F 0 "C218" H 2565 3896 50  0000 L CNN
+F 1 "100n" H 2565 3805 50  0000 L CNN
+F 2 "Capacitor_SMD:C_0603_1608Metric" H 2488 3700 50  0001 C CNN
+F 3 "~" H 2450 3850 50  0001 C CNN
+	1    2450 3850
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2450 4100 2950 4100
+Wire Wire Line
+	2950 4100 2950 4000
+Connection ~ 2450 4100
+Wire Wire Line
+	2100 3600 2450 3600
+Wire Wire Line
+	2450 3700 2450 3600
+Connection ~ 2450 3600
+Wire Wire Line
+	2450 3600 2950 3600
+Wire Wire Line
+	2950 3700 2950 3600
+Connection ~ 2950 3600
+$Comp
+L Device:R R214
+U 1 1 5E255618
+P 2950 3850
+F 0 "R214" H 3020 3896 50  0000 L CNN
+F 1 "1k 0.1%" H 3020 3805 50  0000 L CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 2880 3850 50  0001 C CNN
+F 3 "~" H 2950 3850 50  0001 C CNN
+	1    2950 3850
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R R212
+U 1 1 5E25723A
+P 1300 4350
+F 0 "R212" H 1370 4396 50  0000 L CNN
+F 1 "1k 0.1%" H 1370 4305 50  0000 L CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 1230 4350 50  0001 C CNN
+F 3 "~" H 1300 4350 50  0001 C CNN
+	1    1300 4350
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1300 4200 1300 4100
+Connection ~ 1300 4100
+Wire Wire Line
+	1300 4500 1300 4600
+$Comp
+L power:GND #PWR0134
+U 1 1 5E26828E
+P 1300 4600
+F 0 "#PWR0134" H 1300 4350 50  0001 C CNN
+F 1 "GND" H 1305 4427 50  0000 C CNN
+F 2 "" H 1300 4600 50  0001 C CNN
+F 3 "" H 1300 4600 50  0001 C CNN
+	1    1300 4600
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR0135
+U 1 1 5E27DDA3
+P 1700 4600
+F 0 "#PWR0135" H 1700 4350 50  0001 C CNN
+F 1 "GND" H 1705 4427 50  0000 C CNN
+F 2 "" H 1700 4600 50  0001 C CNN
+F 3 "" H 1700 4600 50  0001 C CNN
+	1    1700 4600
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1700 4600 1700 3900
+Wire Wire Line
+	1650 5150 1650 5200
+Wire Wire Line
+	1650 5200 1800 5200
+Connection ~ 1650 5200
+Wire Wire Line
+	1650 5200 1650 5250
+$Comp
+L Device:C C216
+U 1 1 5E292BA1
+P 1950 5200
+F 0 "C216" V 1698 5200 50  0000 C CNN
+F 1 "100n" V 1789 5200 50  0000 C CNN
+F 2 "Capacitor_SMD:C_0603_1608Metric" H 1988 5050 50  0001 C CNN
+F 3 "~" H 1950 5200 50  0001 C CNN
+	1    1950 5200
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	2100 5200 2250 5200
+Wire Wire Line
+	2250 5200 2250 5250
+Text Label 700  5450 0    50   ~ 0
+S-
+$Comp
+L power:+5VA #PWR0136
+U 1 1 5E292BAA
+P 1650 5150
+F 0 "#PWR0136" H 1650 5000 50  0001 C CNN
+F 1 "+5VA" H 1665 5323 50  0000 C CNN
+F 2 "" H 1650 5150 50  0001 C CNN
+F 3 "" H 1650 5150 50  0001 C CNN
+	1    1650 5150
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	700  5450 1450 5450
+$Comp
+L power:GND #PWR0137
+U 1 1 5E292BB1
+P 2250 5250
+F 0 "#PWR0137" H 2250 5000 50  0001 C CNN
+F 1 "GND" H 2255 5077 50  0000 C CNN
+F 2 "" H 2250 5250 50  0001 C CNN
+F 3 "" H 2250 5250 50  0001 C CNN
+	1    2250 5250
+	1    0    0    -1  
+$EndComp
+$Comp
+L Amplifier_Operational:MCP6401UT-xOT U203
+U 1 1 5E292BB7
+P 1750 5550
+F 0 "U203" H 1650 5550 50  0000 L CNN
+F 1 "MCP6V31U" H 1750 5350 50  0000 L CNN
+F 2 "Package_TO_SOT_SMD:SOT-353_SC-70-5" H 1750 5550 50  0001 L CNN
+F 3 "http://ww1.microchip.com/downloads/en/devicedoc/22229d.pdf" H 1750 5550 50  0001 C CNN
+	1    1750 5550
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1450 5650 1250 5650
+Wire Wire Line
+	1250 5650 1250 6050
+Wire Wire Line
+	1250 6050 2400 6050
+Wire Wire Line
+	2400 6050 2400 5950
+$Comp
+L Device:C C217
+U 1 1 5E292BC1
+P 2400 5800
+F 0 "C217" H 2515 5846 50  0000 L CNN
+F 1 "100n" H 2515 5755 50  0000 L CNN
+F 2 "Capacitor_SMD:C_0603_1608Metric" H 2438 5650 50  0001 C CNN
+F 3 "~" H 2400 5800 50  0001 C CNN
+	1    2400 5800
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2400 6050 2900 6050
+Wire Wire Line
+	2900 6050 2900 5950
+Connection ~ 2400 6050
+Wire Wire Line
+	2050 5550 2400 5550
+Wire Wire Line
+	2400 5650 2400 5550
+Connection ~ 2400 5550
+Wire Wire Line
+	2400 5550 2900 5550
+Wire Wire Line
+	2900 5650 2900 5550
+Connection ~ 2900 5550
+$Comp
+L Device:R R213
+U 1 1 5E292BD1
+P 2900 5800
+F 0 "R213" H 2970 5846 50  0000 L CNN
+F 1 "1k 0.1%" H 2970 5755 50  0000 L CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 2830 5800 50  0001 C CNN
+F 3 "~" H 2900 5800 50  0001 C CNN
+	1    2900 5800
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R R202
+U 1 1 5E292BD7
+P 1250 6300
+F 0 "R202" H 1320 6346 50  0000 L CNN
+F 1 "1k 0.1%" H 1320 6255 50  0000 L CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 1180 6300 50  0001 C CNN
+F 3 "~" H 1250 6300 50  0001 C CNN
+	1    1250 6300
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1250 6150 1250 6050
+Connection ~ 1250 6050
+Wire Wire Line
+	1250 6450 1250 6550
+$Comp
+L power:GND #PWR0138
+U 1 1 5E292BE0
+P 1250 6550
+F 0 "#PWR0138" H 1250 6300 50  0001 C CNN
+F 1 "GND" H 1255 6377 50  0000 C CNN
+F 2 "" H 1250 6550 50  0001 C CNN
+F 3 "" H 1250 6550 50  0001 C CNN
+	1    1250 6550
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR0139
+U 1 1 5E292BE6
+P 1650 6550
+F 0 "#PWR0139" H 1650 6300 50  0001 C CNN
+F 1 "GND" H 1655 6377 50  0000 C CNN
+F 2 "" H 1650 6550 50  0001 C CNN
+F 3 "" H 1650 6550 50  0001 C CNN
+	1    1650 6550
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1650 6550 1650 5850
+Wire Wire Line
+	4850 3500 4850 3550
+Wire Wire Line
+	4850 3550 5000 3550
+Connection ~ 4850 3550
+Wire Wire Line
+	4850 3550 4850 3600
+$Comp
+L Device:C C219
+U 1 1 5E2E5D32
+P 5150 3550
+F 0 "C219" V 4898 3550 50  0000 C CNN
+F 1 "100n" V 4989 3550 50  0000 C CNN
+F 2 "Capacitor_SMD:C_0603_1608Metric" H 5188 3400 50  0001 C CNN
+F 3 "~" H 5150 3550 50  0001 C CNN
+	1    5150 3550
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	5300 3550 5450 3550
+Wire Wire Line
+	5450 3550 5450 3600
+$Comp
+L power:+5VA #PWR0140
+U 1 1 5E2E5D3E
+P 4850 3500
+F 0 "#PWR0140" H 4850 3350 50  0001 C CNN
+F 1 "+5VA" H 4865 3673 50  0000 C CNN
+F 2 "" H 4850 3500 50  0001 C CNN
+F 3 "" H 4850 3500 50  0001 C CNN
+	1    4850 3500
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR0141
+U 1 1 5E2E5D48
+P 5450 3600
+F 0 "#PWR0141" H 5450 3350 50  0001 C CNN
+F 1 "GND" H 5455 3427 50  0000 C CNN
+F 2 "" H 5450 3600 50  0001 C CNN
+F 3 "" H 5450 3600 50  0001 C CNN
+	1    5450 3600
+	1    0    0    -1  
+$EndComp
+$Comp
+L Amplifier_Operational:MCP6401UT-xOT U209
+U 1 1 5E2E5D52
+P 4950 3900
+F 0 "U209" H 4850 3900 50  0000 L CNN
+F 1 "MCP6V31U" H 4950 3700 50  0000 L CNN
+F 2 "Package_TO_SOT_SMD:SOT-353_SC-70-5" H 4950 3900 50  0001 L CNN
+F 3 "http://ww1.microchip.com/downloads/en/devicedoc/22229d.pdf" H 4950 3900 50  0001 C CNN
+	1    4950 3900
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	5250 3900 5600 3900
+Wire Wire Line
+	4850 4200 4850 4550
+$Comp
+L power:GND #PWR0142
+U 1 1 5E3229FE
+P 4850 4550
+F 0 "#PWR0142" H 4850 4300 50  0001 C CNN
+F 1 "GND" H 4855 4377 50  0000 C CNN
+F 2 "" H 4850 4550 50  0001 C CNN
+F 3 "" H 4850 4550 50  0001 C CNN
+	1    4850 4550
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R R215
+U 1 1 5E333B2A
+P 3600 3600
+F 0 "R215" H 3670 3646 50  0000 L CNN
+F 1 "1k 0.1%" H 3670 3555 50  0000 L CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 3530 3600 50  0001 C CNN
+F 3 "~" H 3600 3600 50  0001 C CNN
+	1    3600 3600
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	2950 3600 3450 3600
+Wire Wire Line
+	3750 3600 4000 3600
+Wire Wire Line
+	4000 3600 4000 3800
+Wire Wire Line
+	4000 3800 4650 3800
+Wire Wire Line
+	4000 3800 4000 4200
+Connection ~ 4000 3800
+$Comp
+L Device:R R216
+U 1 1 5E352DB6
+P 4000 4350
+F 0 "R216" H 4070 4396 50  0000 L CNN
+F 1 "5k 0.1%" H 4070 4305 50  0000 L CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 3930 4350 50  0001 C CNN
+F 3 "~" H 4000 4350 50  0001 C CNN
+	1    4000 4350
+	-1   0    0    1   
+$EndComp
+Wire Wire Line
+	4000 4500 4000 4550
+$Comp
+L power:GND #PWR0143
+U 1 1 5E35E6EA
+P 4000 4550
+F 0 "#PWR0143" H 4000 4300 50  0001 C CNN
+F 1 "GND" H 4005 4377 50  0000 C CNN
+F 2 "" H 4000 4550 50  0001 C CNN
+F 3 "" H 4000 4550 50  0001 C CNN
+	1    4000 4550
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	4350 5550 4350 5400
+Wire Wire Line
+	2900 5550 4350 5550
+$Comp
+L Device:R R217
+U 1 1 5E381FD9
+P 4350 5250
+F 0 "R217" H 4200 5300 50  0000 L CNN
+F 1 "1k 0.1%" H 4000 5200 50  0000 L CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 4280 5250 50  0001 C CNN
+F 3 "~" H 4350 5250 50  0001 C CNN
+	1    4350 5250
+	-1   0    0    1   
+$EndComp
+Wire Wire Line
+	4350 5100 4350 4350
+Wire Wire Line
+	4350 4000 4650 4000
+Wire Wire Line
+	4350 4350 5600 4350
+Wire Wire Line
+	5600 4350 5600 4250
+Connection ~ 4350 4350
+Wire Wire Line
+	4350 4350 4350 4000
+$Comp
+L Device:R R218
+U 1 1 5E3A5DAA
+P 5600 4100
+F 0 "R218" H 5670 4146 50  0000 L CNN
+F 1 "5k 0.1%" H 5670 4055 50  0000 L CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" V 5530 4100 50  0001 C CNN
+F 3 "~" H 5600 4100 50  0001 C CNN
+	1    5600 4100
+	-1   0    0    1   
+$EndComp
+Wire Wire Line
+	5600 3950 5600 3900
+Connection ~ 5600 3900
+Wire Wire Line
+	5600 3900 5900 3900
 $EndSCHEMATC
--- a/reflow-oven-control-pcb-cache.lib
+++ b/reflow-oven-control-pcb-cache.lib
@ -39,31 +39,6 @@ X 2Y3 9 500 -200 200 L 50 50 1 0 T
 ENDDRAW
 ENDDEF
 #
-# Amplifier_Instrumentation_INA128
-#
-DEF Amplifier_Instrumentation_INA128 U 0 5 Y Y 1 F N
-F0 "U" 150 125 50 H V L CNN
-F1 "Amplifier_Instrumentation_INA128" 150 -125 50 H V L CNN
-F2 "" 100 0 50 H I C CNN
-F3 "" 100 0 50 H I C CNN
-ALIAS INA129
-$FPLIST
- DIP*W7.62mm*
- SOIC*P1.27mm*
-$ENDFPLIST
-DRAW
-P 4 0 1 10 300 0 -200 250 -200 -250 300 0 f
-X Rg 1 -300 100 100 R 50 50 1 1 P
-X - 2 -300 -200 100 R 50 50 1 1 I
-X + 3 -300 200 100 R 50 50 1 1 I
-X V- 4 0 -300 150 U 50 50 1 1 W
-X Ref 5 100 -300 200 U 50 50 1 1 I
-X ~ 6 400 0 100 L 50 50 1 1 O
-X V+ 7 0 300 150 D 50 50 1 1 W
-X Rg 8 -300 -100 100 R 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
 # Amplifier_Operational_MCP6401UT-xOT
 #
 DEF Amplifier_Operational_MCP6401UT-xOT U 0 5 Y Y 1 F N