diff -r a70499980c1d -r ac54b4966d64 hp34970.sch
--- a/hp34970.sch	Sat Sep 19 21:03:39 2020 +0200
+++ b/hp34970.sch	Sat Oct 09 16:17:26 2021 +0200
@@ -4,9 +4,9 @@
 $Descr A4 11693 8268
 encoding utf-8
 Sheet 1 1
-Title ""
+Title "HP 34970A replacement front panel"
 Date ""
-Rev ""
+Rev "2"
 Comp ""
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-F 1 "100n" H 2190 6605 50  0000 L CNN
-F 2 "Capacitor_SMD:C_1206_3216Metric" H 2113 6500 50  0001 C CNN
-F 3 "~" H 2075 6650 50  0001 C CNN
-	1    2075 6650
+P 2475 7025
+F 0 "C5" H 2590 7071 50  0000 L CNN
+F 1 "100n" H 2590 6980 50  0000 L CNN
+F 2 "Capacitor_SMD:C_1206_3216Metric" H 2513 6875 50  0001 C CNN
+F 3 "~" H 2475 7025 50  0001 C CNN
+	1    2475 7025
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 $EndComp
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 Wire Wire Line
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+Connection ~ 2150 6750
 Wire Wire Line
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+	2150 7325 2475 7325
 Wire Wire Line
-	2075 6950 2075 6800
-Connection ~ 1750 6950
+	2475 7325 2475 7175
+Connection ~ 2150 7325
 NoConn ~ 4350 5000
 NoConn ~ 4350 5500
 NoConn ~ 4350 5800
 NoConn ~ 4350 5900
 NoConn ~ 4350 6000
-NoConn ~ 4350 6200
-NoConn ~ 4350 6300
 NoConn ~ 4350 6400
 NoConn ~ 4350 6500
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 F 0 "R14" H 6750 1625 50  0000 L CNN
-F 1 "412k" H 6750 1550 50  0000 L CNN
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 F 2 "Resistor_SMD:R_1206_3216Metric" V 6630 1575 50  0001 C CNN
 F 3 "~" H 6700 1575 50  0001 C CNN
 	1    6700 1575
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 L Device:R R15
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-P 2000 1075
-F 0 "R15" V 1793 1075 50  0000 C CNN
-F 1 "100k" V 1884 1075 50  0000 C CNN
-F 2 "Resistor_SMD:R_1206_3216Metric" V 1930 1075 50  0001 C CNN
-F 3 "~" H 2000 1075 50  0001 C CNN
-	1    2000 1075
+P 2025 3125
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+F 1 "100k" V 1909 3125 50  0000 C CNN
+F 2 "Resistor_SMD:R_1206_3216Metric" V 1955 3125 50  0001 C CNN
+F 3 "~" H 2025 3125 50  0001 C CNN
+	1    2025 3125
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 Wire Wire Line
-	2225 1075 2225 775 
+	2250 3125 2250 2825
 Wire Wire Line
-	2225 775  1875 775 
+	2250 2825 1800 2825
 $Comp
 L Device:R R16
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 P 6700 1950
 F 0 "R16" H 6775 2025 50  0000 L CNN
-F 1 "200k" H 6775 1950 50  0000 L CNN
+F 1 "294k" H 6775 1950 50  0000 L CNN
 F 2 "Resistor_SMD:R_1206_3216Metric" V 6630 1950 50  0001 C CNN
 F 3 "~" H 6700 1950 50  0001 C CNN
 	1    6700 1950
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 Wire Wire Line
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 Wire Wire Line
 	7450 2125 7075 2125
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 P 4100 4750
 F 0 "Y1" V 4054 4838 50  0000 L CNN
-F 1 "16MHz" V 4145 4838 50  0000 L CNN
+F 1 "8MHz" V 4145 4838 50  0000 L CNN
 F 2 "Crystal:Crystal_SMD_Abracon_ABM3B-4Pin_5.0x3.2mm" H 4100 4750 50  0001 C CNN
 F 3 "~" H 4100 4750 50  0001 C CNN
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 NoConn ~ 6075 5300
 Wire Wire Line
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-Wire Wire Line
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-Text Label 9250 1325 0    50   ~ 0
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 VDD
-Text Label 9100 1700 3    50   ~ 0
-VSS
-Text Label 8725 2125 3    50   ~ 0
-VSS
 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
 	8725 1725 8500 1725
 Wire Wire Line
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 F 0 "C11" H 9218 1596 50  0000 L CNN
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 F 2 "Capacitor_SMD:C_1206_3216Metric" H 9138 1400 50  0001 C CNN
 F 3 "~" H 9100 1550 50  0001 C CNN
 	1    9100 1550
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-F 1 "51k" H 8795 1430 50  0000 L CNN
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 F 2 "Resistor_SMD:R_1206_3216Metric" V 8655 1475 50  0001 C CNN
 F 3 "~" H 8725 1475 50  0001 C CNN
 	1    8725 1475
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 Wire Wire Line
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-F 0 "SW21" V 3746 3852 50  0000 R CNN
-F 1 "RESET" V 3655 3852 50  0000 R CNN
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+F 1 "RESET" V 3775 4225 50  0000 R CNN
 F 2 "Button_Switch_THT:SW_PUSH_6mm_H5mm" H 3700 4100 50  0001 C CNN
 F 3 "~" H 3700 4100 50  0001 C CNN
 	1    3700 3900
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-F 0 "C17" H 3990 3946 50  0000 L CNN
-F 1 "100n" H 3990 3855 50  0000 L CNN
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+F 1 "100n" H 3900 3800 50  0000 L CNN
 F 2 "Capacitor_SMD:C_1206_3216Metric" H 3913 3750 50  0001 C CNN
 F 3 "~" H 3875 3900 50  0001 C CNN
 	1    3875 3900
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
-	2400 6950 2075 6950
-Connection ~ 2075 6950
+	2800 7325 2475 7325
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 $Comp
 L Device:CP C16
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-P 2400 6650
-F 0 "C16" H 2518 6696 50  0000 L CNN
-F 1 "10u" H 2518 6605 50  0000 L CNN
-F 2 "Capacitor_SMD:C_1206_3216Metric" H 2438 6500 50  0001 C CNN
-F 3 "~" H 2400 6650 50  0001 C CNN
-	1    2400 6650
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+F 2 "Capacitor_SMD:C_1206_3216Metric" H 2838 6875 50  0001 C CNN
+F 3 "~" H 2800 7025 50  0001 C CNN
+	1    2800 7025
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 $EndComp
 Wire Wire Line
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 L Device:R R19
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-P 7700 2800
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-F 2 "Resistor_SMD:R_1206_3216Metric" V 7630 2800 50  0001 C CNN
-F 3 "~" H 7700 2800 50  0001 C CNN
-	1    7700 2800
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+F 2 "Resistor_SMD:R_1206_3216Metric" V 8105 2975 50  0001 C CNN
+F 3 "~" H 8175 2975 50  0001 C CNN
+	1    8175 2975
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 $EndComp
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 L Device:R R20
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-F 2 "Resistor_SMD:R_1206_3216Metric" V 7630 3000 50  0001 C CNN
-F 3 "~" H 7700 3000 50  0001 C CNN
-	1    7700 3000
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+F 3 "~" H 8175 3175 50  0001 C CNN
+	1    8175 3175
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 $EndComp
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 L Device:R R21
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-F 2 "Resistor_SMD:R_1206_3216Metric" V 7630 3100 50  0001 C CNN
-F 3 "~" H 7700 3100 50  0001 C CNN
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+	1    8175 3275
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 $EndComp
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-F 2 "Resistor_SMD:R_1206_3216Metric" V 7630 3200 50  0001 C CNN
-F 3 "~" H 7700 3200 50  0001 C CNN
-	1    7700 3200
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+F 2 "Resistor_SMD:R_1206_3216Metric" V 8105 3375 50  0001 C CNN
+F 3 "~" H 8175 3375 50  0001 C CNN
+	1    8175 3375
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 $EndComp
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 Wire Wire Line
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-Wire Wire Line
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 Wire Wire Line
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-Text Label 8075 2900 0    50   ~ 0
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 SWDIO
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 NRST
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 SWO
 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
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 Wire Wire Line
-	7400 2900 8075 2900
-Text Label 8075 2700 0    50   ~ 0
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 Wire Wire Line
-	7400 2700 8075 2700
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-F 0 "J4" H 7308 3281 50  0000 C CNN
-F 1 "SWD" H 7308 3190 50  0000 C CNN
-F 2 "Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal" H 7200 2900 50  0001 C CNN
-F 3 "~" H 7200 2900 50  0001 C CNN
-	1    7200 2900
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+F 0 "J4" H 7783 3456 50  0000 C CNN
+F 1 "SWD" H 7783 3365 50  0000 C CNN
+F 2 "Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal" H 7675 3075 50  0001 C CNN
+F 3 "~" H 7675 3075 50  0001 C CNN
+	1    7675 3075
+	1    0    0    -1  
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+	1725 2750 1800 2750
+Wire Wire Line
+	1800 2750 1800 2825
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+F 3 "" H 1175 5900 50  0001 C CNN
+	1    1175 5900
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+	1    0    0    -1  
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+F 1 "MCP1811AT-033_OT" H 9975 1676 50  0000 C CNN
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+	1    9975 1425
+	1    0    0    -1  
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+	1    10625 1575
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+Wire Wire Line
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+Wire Wire Line
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+F 2 "" H 9825 2825 50  0001 C CNN
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+	1    9825 2825
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+	1    9925 2425
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 Wire Wire Line
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+Text Label 825  1625 2    50   ~ 0
+BFPDO
+Text Label 3175 1625 0    50   ~ 0
+BFPRST
+Text Label 3175 1325 0    50   ~ 0
+RST
+Wire Wire Line
+	1325 1525 950  1525
+Wire Wire Line
+	1325 1625 1050 1625
+$Comp
+L Device:R R1
+U 1 1 5FB82B7D
+P 950 825
+F 0 "R1" H 800 950 50  0000 L CNN
+F 1 "1k" H 800 825 50  0000 L CNN
+F 2 "Resistor_SMD:R_1206_3216Metric" V 880 825 50  0001 C CNN
+F 3 "~" H 950 825 50  0001 C CNN
+	1    950  825 
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	950  625  1050 625 
+$Comp
+L Device:R R3
+U 1 1 5FB83AE6
+P 1050 825
+F 0 "R3" H 1100 975 50  0000 L CNN
+F 1 "1k" H 1100 850 50  0000 L CNN
+F 2 "Resistor_SMD:R_1206_3216Metric" V 980 825 50  0001 C CNN
+F 3 "~" H 1050 825 50  0001 C CNN
+	1    1050 825 
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1050 625  1050 675 
+Wire Wire Line
+	850  1325 1050 1325
+Text Label 1325 925  2    50   ~ 0
++3.3V
+Connection ~ 1050 1325
+Wire Wire Line
+	1050 1325 1325 1325
+Wire Wire Line
+	850  1225 950  1225
+Text Label 1125 625  0    50   ~ 0
++3.3V
+Wire Wire Line
+	950  625  950  675 
+Wire Wire Line
+	950  975  950  1225
+Connection ~ 950  1225
+Wire Wire Line
+	950  1225 1325 1225
+Wire Wire Line
+	1050 975  1050 1325
 Wire Wire Line
-	1775 700  1775 775 
-Connection ~ 1775 775 
+	1325 825  1325 925 
+$Comp
+L Device:R R4
+U 1 1 5FC2BBCE
+P 950 1900
+F 0 "R4" H 800 1975 50  0000 L CNN
+F 1 "1k5" H 750 1900 50  0000 L CNN
+F 2 "Resistor_SMD:R_1206_3216Metric" V 880 1900 50  0001 C CNN
+F 3 "~" H 950 1900 50  0001 C CNN
+	1    950  1900
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R R2
+U 1 1 5FC2C29F
+P 1050 1900
+F 0 "R2" H 1100 1975 50  0000 L CNN
+F 1 "1k5" H 1100 1900 50  0000 L CNN
+F 2 "Resistor_SMD:R_1206_3216Metric" V 980 1900 50  0001 C CNN
+F 3 "~" H 1050 1900 50  0001 C CNN
+	1    1050 1900
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	950  1750 950  1525
+Connection ~ 950  1525
+Wire Wire Line
+	950  1525 825  1525
+Wire Wire Line
+	1050 1750 1050 1625
+Connection ~ 1050 1625
+Wire Wire Line
+	1050 1625 825  1625
+Wire Wire Line
+	950  2050 950  2125
+Wire Wire Line
+	950  2125 1050 2125
+Wire Wire Line
+	1050 2125 1050 2050
+Wire Wire Line
+	1050 2125 1125 2125
+Connection ~ 1050 2125
+Text Label 1125 2125 0    50   ~ 0
++5V
 Wire Wire Line
-	1775 775  1875 775 
+	1050 625  1125 625 
+Connection ~ 1050 625 
+Wire Wire Line
+	2725 1325 2925 1325
+Wire Wire Line
+	2725 1625 2950 1625
+$Comp
+L Device:R R5
+U 1 1 5FCCD2CA
+P 2925 900
+F 0 "R5" H 2775 1025 50  0000 L CNN
+F 1 "1k" H 2775 900 50  0000 L CNN
+F 2 "Resistor_SMD:R_1206_3216Metric" V 2855 900 50  0001 C CNN
+F 3 "~" H 2925 900 50  0001 C CNN
+	1    2925 900 
+	1    0    0    -1  
+$EndComp
+Text Label 3000 675  0    50   ~ 0
++3.3V
+$Comp
+L Device:R R6
+U 1 1 5FCCD96D
+P 2950 1825
+F 0 "R6" H 3000 1900 50  0000 L CNN
+F 1 "1k5" H 3000 1825 50  0000 L CNN
+F 2 "Resistor_SMD:R_1206_3216Metric" V 2880 1825 50  0001 C CNN
+F 3 "~" H 2950 1825 50  0001 C CNN
+	1    2950 1825
+	1    0    0    -1  
+$EndComp
+Text Label 3025 2025 0    50   ~ 0
++5V
+Wire Wire Line
+	3000 675  2925 675 
+Wire Wire Line
+	2925 675  2925 750 
+Wire Wire Line
+	2925 1050 2925 1325
+Connection ~ 2925 1325
+Wire Wire Line
+	2925 1325 3175 1325
+Wire Wire Line
+	2950 1625 2950 1675
+Connection ~ 2950 1625
 Wire Wire Line
-	10300 1600 10300 1750
+	2950 1625 3175 1625
+Wire Wire Line
+	2950 1975 2950 2025
+Wire Wire Line
+	2950 2025 3025 2025
+Wire Notes Line
+	3650 2375 475  2375
+Wire Wire Line
+	1050 5800 1175 5800
+Wire Wire Line
+	1175 5800 1175 5900
+NoConn ~ 1050 5200
+NoConn ~ 1050 5400
+NoConn ~ 1050 4800
+NoConn ~ 1050 4700
+Wire Wire Line
+	2725 1725 2800 1725
+Wire Wire Line
+	2800 1725 2800 1825
+Connection ~ 2800 1825
+Wire Wire Line
+	2725 1425 2800 1425
 Wire Wire Line
-	9800 1600 9800 1775
-Text Label 9800 1775 0    50   ~ 0
-GND_FLT
+	2800 1425 2800 1725
+Connection ~ 2800 1725
+Wire Notes Line
+	500  6375 4025 6375
+Wire Notes Line
+	4025 6375 4025 7800
+Wire Notes Line
+	1800 4100 1800 6375
+Wire Notes Line
+	2725 4100 2725 2375
+Wire Notes Line
+	475  4100 2725 4100
+Wire Notes Line
+	6975 6525 6975 3700
+Wire Notes Line
+	6975 3700 11225 3700
+Wire Notes Line
+	7375 3725 7375 2625
+Wire Notes Line
+	9125 2050 11225 2050
+Wire Notes Line
+	9125 2050 9125 3700
+Wire Notes Line
+	3650 525  3650 2625
+Wire Notes Line
+	3650 2625 9125 2625
+Text Notes 4425 725  2    50   ~ 0
+Power supplies
+Text Notes 7625 1150 2    50   ~ 0
+18V -> 5V (500mA)
+Text Notes 10650 975  2    50   ~ 0
+5V -> 3.3V (150mA)
+Text Notes 10925 3375 2    50   ~ 0
+OLED display (SSD1322, 256x64, SPI)
+Text Notes 8700 3575 2    50   ~ 0
+SWD port
+Text Notes 2450 3900 2    50   ~ 0
+USB port (DFU, UART)
+Text Notes 3500 2250 2    50   ~ 0
+Level converter (5V <-> 3.3V)
+Text Notes 1475 4325 2    50   ~ 0
+Main unit connector
+Text Notes 7825 1525 2    50   ~ 0
+18V (in)
+$Comp
+L Device:R_Small R7
+U 1 1 615C5C6C
+P 1975 3425
+F 0 "R7" V 1900 3425 50  0000 C CNN
+F 1 "430k" V 2050 3300 50  0000 C CNN
+F 2 "" H 1975 3425 50  0001 C CNN
+F 3 "~" H 1975 3425 50  0001 C CNN
+	1    1975 3425
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:R_Small R8
+U 1 1 615C6F11
+P 2275 3425
+F 0 "R8" V 2200 3425 50  0000 C CNN
+F 1 "620k" V 2350 3450 50  0000 C CNN
+F 2 "" H 2275 3425 50  0001 C CNN
+F 3 "~" H 2275 3425 50  0001 C CNN
+	1    2275 3425
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	1725 3425 1875 3425
+Wire Wire Line
+	2075 3425 2125 3425
+Wire Wire Line
+	2375 3425 2525 3425
+Wire Wire Line
+	2525 3425 2525 3125
+Wire Wire Line
+	2525 3125 2250 3125
+Connection ~ 2525 3425
+Wire Wire Line
+	2125 3425 2125 3600
+Connection ~ 2125 3425
+Wire Wire Line
+	2125 3425 2175 3425
+Text Label 1900 3700 0    50   ~ 0
+USB_DETECT
+Wire Wire Line
+	4350 6300 4100 6300
+Wire Wire Line
+	4100 6300 4100 6150
+Wire Wire Line
+	4350 6200 4175 6200
+Wire Wire Line
+	4175 6200 4175 6100
+Wire Wire Line
+	4175 6100 3800 6100
+$Comp
+L Connector:Conn_01x03_Female J5
+U 1 1 61675DD6
+P 3100 6000
+F 0 "J5" H 2992 5675 50  0000 C CNN
+F 1 "Serial_Console" H 2992 5766 50  0000 C CNN
+F 2 "" H 3100 6000 50  0001 C CNN
+F 3 "~" H 3100 6000 50  0001 C CNN
+	1    3100 6000
+	-1   0    0    1   
+$EndComp
+Wire Wire Line
+	3800 6100 3800 5900
+Wire Wire Line
+	3800 5900 3300 5900
+Wire Wire Line
+	3750 6150 3750 6000
+Wire Wire Line
+	3750 6000 3300 6000
+Wire Wire Line
+	3750 6150 4100 6150
+$Comp
+L power:GND #PWR01
+U 1 1 616A818A
+P 3375 6175
+F 0 "#PWR01" H 3375 5925 50  0001 C CNN
+F 1 "GND" H 3380 6002 50  0000 C CNN
+F 2 "" H 3375 6175 50  0001 C CNN
+F 3 "" H 3375 6175 50  0001 C CNN
+	1    3375 6175
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	3375 6175 3375 6100
+Wire Wire Line
+	3375 6100 3300 6100
+NoConn ~ 4350 6100
 $EndSCHEMATC