Move vias to better locations: These vias have proven unfortunately placed for hand soldering

* Remove voltage buffer Opamp after TL431PK because it may oscillate
* Replace TL431PK with TL431LI. Stabilized by very large capacitance (> 10uF)
* Add panic passives to differential amplifier in order to avoid oscillaton. Values as they are now should work.
* Remove external ADC. Tests with version v1.1 show that the precision of the STM's ADC is sufficient, (once all oscillations are damped by modifying the circuit)
* Power whole OpAmp circuit with 3.3 volts in order to eliminate the need for the clamping diode at the ADC pin. This diode showed a high reverse current over temperature, which affected the measurement.

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
@@ -86,30 +61,6 @@ X ~ 4 300 0 100 L 50 50 1 1 O
 ENDDRAW
 ENDDEF
 #
-# Analog_ADC_MCP3551-EMS
-#
-DEF Analog_ADC_MCP3551-EMS U 0 40 Y Y 1 F N
-F0 "U" -450 300 50 H V L CNN
-F1 "Analog_ADC_MCP3551-EMS" 200 300 50 H V L CNN
-F2 "" 0 0 50 H I C CIN
-F3 "" 0 0 50 H I C CNN
-ALIAS MCP3551-EMS
-$FPLIST
- MSOP*
-$ENDFPLIST
-DRAW
-P 7 0 1 10 -200 250 350 250 350 0 350 -250 -200 -250 -450 0 -200 250 f
-X Vref 1 -100 -400 150 U 50 50 1 1 I
-X Vin+ 2 -500 100 150 R 50 50 1 1 P
-X Vin- 3 -500 -100 150 R 50 50 1 1 P
-X Vss 4 100 -400 150 U 50 50 1 1 W
-X SCK 5 500 100 150 L 50 50 1 1 I
-X SDO/~RDY~ 6 500 0 150 L 50 50 1 1 O
-X ~CS~ 7 500 -100 150 L 50 50 1 1 I
-X Vdd 8 100 400 150 D 50 50 1 1 W
-ENDDRAW
-ENDDEF
-#
 # Connector_Generic_Conn_01x02
 #
 DEF Connector_Generic_Conn_01x02 J 0 40 Y N 1 F N
@@ -520,26 +471,6 @@ X SB 4 400 200 300 L 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
-# Diode_1N4448W
-#
-DEF Diode_1N4448W D 0 40 N N 1 F N
-F0 "D" 0 100 50 H V C CNN
-F1 "Diode_1N4448W" 0 -100 50 H V C CNN
-F2 "Diode_SMD:D_SOD-123" 0 -175 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-ALIAS 1N4148W BAV16W 1N4448W MMSD4148
-$FPLIST
- D*SOD?123*
-$ENDFPLIST
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-P 2 0 1 10 -50 50 -50 -50 N
-P 2 0 1 0 50 0 -50 0 N
-P 4 0 1 8 50 50 50 -50 -50 0 50 50 N
-X K 1 -150 0 100 R 50 50 1 1 P
-X A 2 150 0 100 L 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
 # Jumper_SolderJumper_2_Open
 #
 DEF Jumper_SolderJumper_2_Open JP 0 0 Y N 1 F N
@@ -562,6 +493,33 @@ X B 2 150 0 100 L 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
+# Jumper_SolderJumper_3_Open
+#
+DEF Jumper_SolderJumper_3_Open JP 0 0 Y N 1 F N
+F0 "JP" -100 -100 50 H V C CNN
+F1 "Jumper_SolderJumper_3_Open" 0 110 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ SolderJumper*Open*
+$ENDFPLIST
+DRAW
+A -40 0 40 901 -901 0 1 0 N -40 40 -40 -40
+A -40 0 40 901 -901 0 1 0 F -40 40 -40 -40
+A 40 0 40 -899 899 0 1 0 N 40 -40 40 40
+A 40 0 40 -899 899 0 1 0 F 40 -40 40 40
+S -20 40 20 -40 0 1 0 F
+P 2 0 1 0 -100 0 -80 0 N
+P 2 0 1 0 -40 40 -40 -40 N
+P 2 0 1 0 0 -50 0 -40 N
+P 2 0 1 0 40 40 40 -40 N
+P 2 0 1 0 100 0 80 0 N
+X A 1 -200 0 100 R 50 50 1 1 P
+X C 2 0 -150 100 U 50 50 1 1 I
+X B 3 200 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
 # MCU_ST_STM32F4_STM32F407VETx
 #
 DEF MCU_ST_STM32F4_STM32F407VETx U 0 20 Y Y 1 F N
@@ -759,23 +717,23 @@ X IO1 6 -500 100 200 R 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
-# Reference_Voltage_TL431PK
+# Reference_Voltage_TL431DBZ
 #
-DEF Reference_Voltage_TL431PK U 0 20 N N 1 F N
+DEF Reference_Voltage_TL431DBZ U 0 20 N N 1 F N
 F0 "U" -100 100 50 H V C CNN
-F1 "Reference_Voltage_TL431PK" 0 -100 50 H V C CNN
-F2 "Package_TO_SOT_SMD:SOT-89-3" 0 -150 50 H I C CIN
+F1 "Reference_Voltage_TL431DBZ" 0 -100 50 H V C CNN
+F2 "Package_TO_SOT_SMD:SOT-23" 0 -150 50 H I C CIN
 F3 "" 0 0 50 H I C CIN
 $FPLIST
- SOT*89*
+ SOT?23*
 $ENDFPLIST
 DRAW
 P 3 0 1 0 -50 0 0 0 50 0 N
 P 3 0 1 0 -30 30 30 0 -30 -30 F
 P 4 0 1 10 20 -40 30 -30 30 30 30 30 N
-X REF 1 0 100 100 D 50 50 1 1 P
-X A 2 -100 0 50 R 50 50 1 1 P
-X K 3 100 0 50 L 50 50 1 1 P
+X K 1 100 0 100 L 50 50 1 1 P
+X REF 2 0 100 100 D 50 50 1 1 P
+X A 3 -100 0 100 R 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
@@ -904,6 +862,21 @@ X D 3 100 200 100 D 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
+# power_+3.3VA
+#
+DEF power_+3.3VA #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power_+3.3VA" 0 140 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 2 0 1 0 -30 50 0 100 N
+P 2 0 1 0 0 0 0 100 N
+P 2 0 1 0 0 100 30 50 N
+X +3.3VA 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
 # power_+3V3
 #
 DEF power_+3V3 #PWR 0 0 Y Y 1 F P
@@ -935,21 +908,6 @@ X +5V 1 0 0 0 U 50 50 1 1 W N
 ENDDRAW
 ENDDEF
 #
-# power_+5VA
-#
-DEF power_+5VA #PWR 0 0 Y Y 1 F P
-F0 "#PWR" 0 -150 50 H I C CNN
-F1 "power_+5VA" 0 140 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-DRAW
-P 2 0 1 0 -30 50 0 100 N
-P 2 0 1 0 0 0 0 100 N
-P 2 0 1 0 0 100 30 50 N
-X +5VA 1 0 0 0 U 50 50 1 1 W N
-ENDDRAW
-ENDDEF
-#
 # power_+5VL
 #
 DEF power_+5VL #PWR 0 0 Y Y 1 F P

reflow-oven-control-pcb.sch

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@@ -136,10 +136,10 @@ F 3 "" H 10800 6200 50  0001 C CNN
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 F 2 "Capacitor_SMD:C_1206_3216Metric" H 10588 5550 50  0001 C CNN
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-F8 "FRONTEND_TEMP" B L 7500 3650 50 
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-	1    9550 1800
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-F 0 "JP101" V 8954 1868 50  0000 L CNN
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-F 3 "~" H 9000 1800 50  0001 C CNN
-	1    9000 1800
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sym-lib-table

@@ -1,3 +1,3 @@
 (sym_lib_table
-  (lib (name shimatta_connectors)(type Legacy)(uri /home/mari/projects/pcb/libs/shimattapcblibs/schematics/shimatta_connectors.lib)(options "")(descr ""))
+  (lib (name shimatta_connectors)(type Legacy)(uri ${SHIMATTA_DIR}/schematics/shimatta_connectors.lib)(options "")(descr ""))
 )