hardware/icE1usb: Initial import of the production hardware design files
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/hardware/icE1usb/fpga.sch b/hardware/icE1usb/fpga.sch
new file mode 100644
index 0000000..e302c6a
--- /dev/null
+++ b/hardware/icE1usb/fpga.sch
@@ -0,0 +1,1406 @@
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 2 7
+Title "icE1usb - FPGA and related digital"
+Date "2020-08-26"
+Rev "1.0"
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+Comment1 "CERN-OHL-S"
+Comment2 "(C) 2020 Sylvain Munaut"
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+F 3 "~" H 8700 3800 50 0001 C CNN
+ 1 8700 3800
+ 1 0 0 -1
+$EndComp
+Text Label 3800 2500 2 50 ~ 0
+clk_30m72
+$Comp
+L Device:R_Small R12
+U 1 1 5F3CCC5E
+P 10400 1700
+F 0 "R12" V 10204 1700 50 0000 C CNN
+F 1 "27R" V 10295 1700 50 0000 C CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" H 10400 1700 50 0001 C CNN
+F 3 "~" H 10400 1700 50 0001 C CNN
+ 1 10400 1700
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 10300 1700 10200 1700
+Text Label 7900 4300 0 50 ~ 0
+flash_mosi
+Text Label 7900 4400 0 50 ~ 0
+flash_miso
+Text Label 7900 4700 0 50 ~ 0
+flash_sck
+$Comp
+L power:+3V3 #PWR029
+U 1 1 5F3F147C
+P 9300 3400
+F 0 "#PWR029" H 9300 3250 50 0001 C CNN
+F 1 "+3V3" H 9315 3573 50 0000 C CNN
+F 2 "" H 9300 3400 50 0001 C CNN
+F 3 "" H 9300 3400 50 0001 C CNN
+ 1 9300 3400
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 9300 4600 9400 4600
+Wire Wire Line
+ 9400 4500 9300 4500
+Connection ~ 9300 4500
+Wire Wire Line
+ 9300 4500 9300 4600
+Text Label 7900 4800 0 50 ~ 0
+~flash_cs
+Wire Wire Line
+ 9400 5600 9100 5600
+Wire Wire Line
+ 9100 5600 9100 4300
+Wire Wire Line
+ 9100 4300 7900 4300
+Wire Wire Line
+ 9400 5700 9000 5700
+Wire Wire Line
+ 9000 5700 9000 4400
+Connection ~ 9000 4400
+Wire Wire Line
+ 9000 4400 7900 4400
+Wire Wire Line
+ 9400 5800 8900 5800
+Wire Wire Line
+ 8900 5800 8900 4700
+Connection ~ 8900 4700
+Wire Wire Line
+ 8900 4700 7900 4700
+Wire Wire Line
+ 9400 5900 8800 5900
+Wire Wire Line
+ 8800 5900 8800 4800
+Connection ~ 8800 4800
+Wire Wire Line
+ 8800 4800 7900 4800
+Wire Wire Line
+ 8800 4000 8800 4800
+Wire Wire Line
+ 8500 3600 8500 3500
+Wire Wire Line
+ 8500 3500 8600 3500
+Wire Wire Line
+ 8800 3500 8800 3600
+Wire Wire Line
+ 8700 3500 8700 3600
+Connection ~ 8700 3500
+Wire Wire Line
+ 8700 3500 8800 3500
+Wire Wire Line
+ 8600 3500 8600 3600
+Connection ~ 8600 3500
+Wire Wire Line
+ 8600 3500 8700 3500
+$Comp
+L power:+3V3 #PWR026
+U 1 1 5F4108CD
+P 8800 3400
+F 0 "#PWR026" H 8800 3250 50 0001 C CNN
+F 1 "+3V3" H 8815 3573 50 0000 C CNN
+F 2 "" H 8800 3400 50 0001 C CNN
+F 3 "" H 8800 3400 50 0001 C CNN
+ 1 8800 3400
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 8800 3400 8800 3500
+Connection ~ 8800 3500
+Wire Wire Line
+ 10300 3400 10300 4300
+Wire Wire Line
+ 9300 3400 9300 4500
+Wire Wire Line
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+Wire Wire Line
+ 8600 5100 8600 6000
+Wire Wire Line
+ 8600 6000 10100 6000
+Wire Wire Line
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+Wire Wire Line
+ 10100 5800 9900 5800
+Wire Wire Line
+ 7900 5200 8500 5200
+Wire Wire Line
+ 8500 5200 8500 6100
+Wire Wire Line
+ 8500 6100 10200 6100
+Wire Wire Line
+ 10200 6100 10200 5700
+Wire Wire Line
+ 10200 5700 9900 5700
+Text Label 7900 5100 0 50 ~ 0
+cdone
+Text Label 7900 5200 0 50 ~ 0
+~creset
+Wire Wire Line
+ 3200 3300 3800 3300
+Wire Wire Line
+ 3200 3400 3800 3400
+Text Label 3800 3300 2 50 ~ 0
+cdone
+Text Label 3800 3400 2 50 ~ 0
+~creset
+$Comp
+L Device:LED_Small D2
+U 1 1 5F442B7A
+P 10400 6000
+F 0 "D2" V 10446 5932 50 0000 R CNN
+F 1 "DONE" V 10355 5932 50 0000 R CNN
+F 2 "LED_SMD:LED_0603_1608Metric" V 10400 6000 50 0001 C CNN
+F 3 "~" V 10400 6000 50 0001 C CNN
+ 1 10400 6000
+ 0 -1 -1 0
+$EndComp
+Wire Wire Line
+ 8500 4000 8500 5200
+Connection ~ 8500 5200
+Wire Wire Line
+ 8600 4000 8600 4100
+Connection ~ 8600 5100
+Connection ~ 9100 4300
+Wire Wire Line
+ 8700 4000 8700 4100
+Wire Wire Line
+ 8700 4100 8600 4100
+Connection ~ 8600 4100
+Wire Wire Line
+ 8600 4100 8600 5100
+$Comp
+L power:GND #PWR036
+U 1 1 5F4ADE15
+P 10400 6200
+F 0 "#PWR036" H 10400 5950 50 0001 C CNN
+F 1 "GND" H 10405 6027 50 0000 C CNN
+F 2 "" H 10400 6200 50 0001 C CNN
+F 3 "" H 10400 6200 50 0001 C CNN
+ 1 10400 6200
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 10400 5900 10400 5800
+Wire Wire Line
+ 10400 5800 10100 5800
+Connection ~ 10100 5800
+Wire Wire Line
+ 10400 6100 10400 6200
+$Comp
+L power:GND #PWR024
+U 1 1 5F4E85E7
+P 7100 5900
+F 0 "#PWR024" H 7100 5650 50 0001 C CNN
+F 1 "GND" H 7105 5727 50 0000 C CNN
+F 2 "" H 7100 5900 50 0001 C CNN
+F 3 "" H 7100 5900 50 0001 C CNN
+ 1 7100 5900
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 7000 5800 7100 5800
+Wire Wire Line
+ 7100 5800 7100 5900
+Text Label 6100 5800 0 50 ~ 0
+~boot_sw
+$Comp
+L power:GND #PWR018
+U 1 1 5F516168
+P 5600 2100
+F 0 "#PWR018" H 5600 1850 50 0001 C CNN
+F 1 "GND" H 5605 1927 50 0000 C CNN
+F 2 "" H 5600 2100 50 0001 C CNN
+F 3 "" H 5600 2100 50 0001 C CNN
+ 1 5600 2100
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 5600 1800 5600 2100
+$Comp
+L power:+5V #PWR017
+U 1 1 5F51C59B
+P 5600 1000
+F 0 "#PWR017" H 5600 850 50 0001 C CNN
+F 1 "+5V" H 5615 1173 50 0000 C CNN
+F 2 "" H 5600 1000 50 0001 C CNN
+F 3 "" H 5600 1000 50 0001 C CNN
+ 1 5600 1000
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 5600 1000 5600 1400
+$Comp
+L Device:R_Pack04 RN3
+U 1 1 5F522437
+P 6600 1600
+F 0 "RN3" V 6183 1600 50 0000 C CNN
+F 1 "33R" V 6274 1600 50 0000 C CNN
+F 2 "Resistor_SMD:R_Array_Convex_4x0603" V 6875 1600 50 0001 C CNN
+F 3 "~" H 6600 1600 50 0001 C CNN
+ 1 6600 1600
+ 0 -1 -1 0
+$EndComp
+$Comp
+L Device:R_Small R5
+U 1 1 5F5242F9
+P 5100 1000
+F 0 "R5" V 4904 1000 50 0000 C CNN
+F 1 "1k5" V 4995 1000 50 0000 C CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" H 5100 1000 50 0001 C CNN
+F 3 "~" H 5100 1000 50 0001 C CNN
+ 1 5100 1000
+ 0 1 1 0
+$EndComp
+Text HLabel 7000 1700 2 50 Output ~ 0
+dbg_tx
+Text HLabel 7000 1800 2 50 Input ~ 0
+dbg_rx
+Text HLabel 7000 1500 2 50 BiDi ~ 0
+usb_dp
+Text HLabel 7000 1600 2 50 BiDi ~ 0
+usb_dn
+Text HLabel 7300 3500 2 50 Output ~ 0
+e1_led[0..7]
+Text HLabel 3800 2800 2 50 Input ~ 0
+gps_pps
+Text HLabel 3800 3000 2 50 BiDi ~ 0
+i2c_sda
+Text HLabel 3800 2900 2 50 BiDi ~ 0
+i2c_scl
+Text HLabel 3800 2400 2 50 Input ~ 0
+gps_rx
+Text HLabel 3800 2300 2 50 Output ~ 0
+gps_tx
+Text HLabel 3800 3600 2 50 3State ~ 0
+~gps_reset
+Wire Wire Line
+ 3800 2500 3200 2500
+Wire Wire Line
+ 3200 5300 3800 5300
+Wire Wire Line
+ 3800 5200 3200 5200
+Wire Wire Line
+ 3800 5400 3200 5400
+Wire Wire Line
+ 3800 5500 3200 5500
+Wire Wire Line
+ 3800 5700 3200 5700
+Wire Wire Line
+ 3800 5800 3200 5800
+Wire Wire Line
+ 3800 6400 3200 6400
+Wire Wire Line
+ 3800 6500 3200 6500
+Text HLabel 4400 4600 2 50 BiDi ~ 0
+gpio[0..2]
+Text Label 3800 4200 2 50 ~ 0
+gpio0
+Text Label 3800 4300 2 50 ~ 0
+gpio1
+Text Label 3800 4400 2 50 ~ 0
+gpio2
+Text Label 7000 3700 2 50 ~ 0
+e1_led0
+Text Label 7000 3800 2 50 ~ 0
+e1_led1
+Text Label 7000 3900 2 50 ~ 0
+e1_led2
+Wire Wire Line
+ 7000 1500 6800 1500
+Wire Wire Line
+ 7000 1600 6800 1600
+Wire Wire Line
+ 7000 1700 6800 1700
+Wire Wire Line
+ 6800 1800 7000 1800
+Wire Wire Line
+ 6200 1300 6200 1600
+Wire Wire Line
+ 6200 1600 6400 1600
+Wire Wire Line
+ 6400 1500 6300 1500
+Wire Wire Line
+ 6300 1500 6300 1200
+Wire Wire Line
+ 6300 1200 5700 1200
+Wire Wire Line
+ 5500 1400 5500 1300
+Connection ~ 5500 1300
+Wire Wire Line
+ 5500 1300 6200 1300
+Wire Wire Line
+ 5700 1400 5700 1200
+Connection ~ 5700 1200
+Wire Wire Line
+ 6200 1900 6200 1700
+Wire Wire Line
+ 6200 1700 6400 1700
+Wire Wire Line
+ 6400 1800 6300 1800
+Wire Wire Line
+ 6300 1800 6300 2000
+Wire Wire Line
+ 6300 2000 5700 2000
+Wire Wire Line
+ 5500 1800 5500 1900
+Connection ~ 5500 1900
+Wire Wire Line
+ 5500 1900 6200 1900
+Wire Wire Line
+ 5700 1800 5700 2000
+Connection ~ 5700 2000
+Wire Wire Line
+ 5200 1000 5300 1000
+Wire Wire Line
+ 5000 1000 4600 1000
+Wire Wire Line
+ 4600 1900 5500 1900
+Wire Wire Line
+ 4600 2000 5700 2000
+Text Label 4600 1000 0 50 ~ 0
+usb_pu_i
+Text Label 4600 1200 0 50 ~ 0
+usb_dp_i
+Text Label 4600 1300 0 50 ~ 0
+usb_dn_i
+Text Label 4600 1900 0 50 ~ 0
+dbg_tx_i
+Text Label 4600 2000 0 50 ~ 0
+dbg_rx_i
+Text Label 3800 4100 2 50 ~ 0
+dbg_rx_i
+Text Label 3800 4000 2 50 ~ 0
+dbg_tx_i
+Text Label 3800 3700 2 50 ~ 0
+usb_dn_i
+Text Label 3800 3800 2 50 ~ 0
+usb_dp_i
+Text Label 3800 3900 2 50 ~ 0
+usb_pu_i
+Wire Wire Line
+ 3200 5600 3800 5600
+Wire Wire Line
+ 3200 5900 3800 5900
+Wire Wire Line
+ 3200 6000 3800 6000
+Wire Wire Line
+ 3200 6100 3800 6100
+Wire Wire Line
+ 3200 6200 3800 6200
+Wire Wire Line
+ 3200 6300 3800 6300
+Wire Wire Line
+ 3200 3600 3800 3600
+Wire Wire Line
+ 3200 3700 3800 3700
+Wire Wire Line
+ 3200 3800 3800 3800
+Wire Wire Line
+ 3200 3900 3800 3900
+Wire Wire Line
+ 3200 4000 3800 4000
+Wire Wire Line
+ 3200 4100 3800 4100
+Wire Wire Line
+ 3200 4500 3800 4500
+Wire Wire Line
+ 3200 3000 3800 3000
+Wire Wire Line
+ 3200 2900 3800 2900
+Wire Wire Line
+ 3200 2800 3800 2800
+Wire Wire Line
+ 3200 2700 3800 2700
+Wire Wire Line
+ 3200 2600 3800 2600
+Wire Wire Line
+ 3200 2400 3800 2400
+Wire Wire Line
+ 3200 2300 3800 2300
+$Comp
+L 74xx:74HC595 U3
+U 1 1 5F7CC4CA
+P 6200 4100
+F 0 "U3" H 6500 4800 50 0000 C CNN
+F 1 "74HC595" H 6500 4700 50 0000 C CNN
+F 2 "Package_SO:TSSOP-16_4.4x5mm_P0.65mm" H 6200 4100 50 0001 C CNN
+F 3 "http://www.ti.com/lit/ds/symlink/sn74hc595.pdf" H 6200 4100 50 0001 C CNN
+ 1 6200 4100
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 6600 3700 7000 3700
+Wire Wire Line
+ 6600 3800 7000 3800
+Wire Wire Line
+ 6600 3900 7000 3900
+Wire Wire Line
+ 6600 4000 7000 4000
+Wire Wire Line
+ 6600 4100 7000 4100
+Wire Wire Line
+ 6600 4200 7000 4200
+Wire Wire Line
+ 6600 4300 7000 4300
+Wire Wire Line
+ 6600 4400 7000 4400
+NoConn ~ 6600 4600
+Text Label 7000 4000 2 50 ~ 0
+e1_led3
+Text Label 7000 4100 2 50 ~ 0
+e1_led4
+Text Label 7000 4200 2 50 ~ 0
+e1_led5
+Text Label 7000 4300 2 50 ~ 0
+e1_led6
+Text Label 7000 4400 2 50 ~ 0
+e1_led7
+Entry Wire Line
+ 7000 3800 7100 3700
+Entry Wire Line
+ 7000 4000 7100 3900
+Entry Wire Line
+ 7000 4100 7100 4000
+Entry Wire Line
+ 7000 4200 7100 4100
+Entry Wire Line
+ 7000 4300 7100 4200
+Entry Wire Line
+ 7000 4400 7100 4300
+Entry Wire Line
+ 7000 3900 7100 3800
+Entry Wire Line
+ 7000 3700 7100 3600
+Wire Bus Line
+ 7100 3500 7300 3500
+$Comp
+L power:GND #PWR023
+U 1 1 5F89F281
+P 6200 4900
+F 0 "#PWR023" H 6200 4650 50 0001 C CNN
+F 1 "GND" H 6205 4727 50 0000 C CNN
+F 2 "" H 6200 4900 50 0001 C CNN
+F 3 "" H 6200 4900 50 0001 C CNN
+ 1 6200 4900
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 6200 4800 6200 4900
+$Comp
+L power:+3V3 #PWR022
+U 1 1 5F8ACC60
+P 6200 2900
+F 0 "#PWR022" H 6200 2750 50 0001 C CNN
+F 1 "+3V3" H 6215 3073 50 0000 C CNN
+F 2 "" H 6200 2900 50 0001 C CNN
+F 3 "" H 6200 2900 50 0001 C CNN
+ 1 6200 2900
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:C_Small C9
+U 1 1 5F90011B
+P 6000 3200
+F 0 "C9" H 5908 3246 50 0000 R CNN
+F 1 "100n" H 5908 3155 50 0000 R CNN
+F 2 "Capacitor_SMD:C_0603_1608Metric" H 6000 3200 50 0001 C CNN
+F 3 "~" H 6000 3200 50 0001 C CNN
+ 1 6000 3200
+ 1 0 0 -1
+$EndComp
+$Comp
+L power:GND #PWR021
+U 1 1 5F901B54
+P 6000 3400
+F 0 "#PWR021" H 6000 3150 50 0001 C CNN
+F 1 "GND" H 5900 3300 50 0000 C CNN
+F 2 "" H 6000 3400 50 0001 C CNN
+F 3 "" H 6000 3400 50 0001 C CNN
+ 1 6000 3400
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 6200 2900 6200 3000
+Wire Wire Line
+ 6000 3300 6000 3400
+Wire Wire Line
+ 6000 3100 6000 3000
+Wire Wire Line
+ 6000 3000 6200 3000
+Connection ~ 6200 3000
+Wire Wire Line
+ 6200 3000 6200 3500
+Wire Wire Line
+ 5800 3700 5300 3700
+Wire Wire Line
+ 5800 3900 5300 3900
+Wire Wire Line
+ 5800 4000 5300 4000
+Wire Wire Line
+ 5800 4200 5300 4200
+$Comp
+L power:GND #PWR019
+U 1 1 5F98FC74
+P 5700 4900
+F 0 "#PWR019" H 5700 4650 50 0001 C CNN
+F 1 "GND" H 5705 4727 50 0000 C CNN
+F 2 "" H 5700 4900 50 0001 C CNN
+F 3 "" H 5700 4900 50 0001 C CNN
+ 1 5700 4900
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 5700 4900 5700 4300
+Wire Wire Line
+ 5700 4300 5800 4300
+Text Label 5300 4000 0 50 ~ 0
+cdone
+Text Label 5300 3700 0 50 ~ 0
+flash_mosi
+Text Notes 10600 6300 0 50 ~ 0
+Must be Blue !\nNeed High Vf !
+Text Label 5300 3900 0 50 ~ 0
+flash_sck
+Text Label 5300 4200 0 50 ~ 0
+e1_led_rclk
+Text Label 3800 4500 2 50 ~ 0
+e1_led_rclk
+Wire Wire Line
+ 4600 1200 5300 1200
+Wire Wire Line
+ 4600 1300 5500 1300
+Wire Wire Line
+ 5300 1000 5300 1200
+Connection ~ 5300 1200
+Wire Wire Line
+ 5300 1200 5700 1200
+$Comp
+L Device:R_Small R6
+U 1 1 5F39DC9A
+P 5800 7100
+F 0 "R6" H 5742 7054 50 0000 R CNN
+F 1 "5k1" H 5742 7145 50 0000 R CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" H 5800 7100 50 0001 C CNN
+F 3 "~" H 5800 7100 50 0001 C CNN
+ 1 5800 7100
+ 1 0 0 1
+$EndComp
+$Comp
+L Device:R_Small R8
+U 1 1 5F39E0B2
+P 5900 7100
+F 0 "R8" H 5959 7054 50 0000 L CNN
+F 1 "5k1" H 5959 7145 50 0000 L CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" H 5900 7100 50 0001 C CNN
+F 3 "~" H 5900 7100 50 0001 C CNN
+ 1 5900 7100
+ 1 0 0 1
+$EndComp
+$Comp
+L power:+3V3 #PWR020
+U 1 1 5F39E1C8
+P 5800 6800
+F 0 "#PWR020" H 5800 6650 50 0001 C CNN
+F 1 "+3V3" H 5815 6973 50 0000 C CNN
+F 2 "" H 5800 6800 50 0001 C CNN
+F 3 "" H 5800 6800 50 0001 C CNN
+ 1 5800 6800
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 5800 6800 5800 6900
+Wire Wire Line
+ 5800 6900 5900 6900
+Wire Wire Line
+ 5900 6900 5900 7000
+Connection ~ 5800 6900
+Wire Wire Line
+ 5800 6900 5800 7000
+Wire Wire Line
+ 5400 7300 5800 7300
+Wire Wire Line
+ 5800 7300 5800 7200
+Wire Wire Line
+ 5400 7400 5900 7400
+Wire Wire Line
+ 5900 7400 5900 7200
+Text Label 5400 7300 0 50 ~ 0
+i2c_sda
+Text Label 5400 7400 0 50 ~ 0
+i2c_scl
+Text Label 3800 3000 2 50 ~ 0
+i2c_sda
+Text Label 3800 2900 2 50 ~ 0
+i2c_scl
+$Comp
+L power:PWR_FLAG #FLG01
+U 1 1 5F39C045
+P 1900 1300
+F 0 "#FLG01" H 1900 1375 50 0001 C CNN
+F 1 "PWR_FLAG" H 1900 1473 50 0001 C CNN
+F 2 "" H 1900 1300 50 0001 C CNN
+F 3 "~" H 1900 1300 50 0001 C CNN
+ 1 1900 1300
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
+ 1900 1300 1900 1400
+Wire Wire Line
+ 1900 1400 2200 1400
+Text Label 3800 2700 2 50 ~ 0
+clk_tune_lo
+Text Label 3800 2600 2 50 ~ 0
+clk_tune_hi
+Text Label 5300 5800 0 50 ~ 0
+e1_led_rclk
+$Comp
+L Device:R_Small R7
+U 1 1 5F4EADE8
+P 5900 5800
+F 0 "R7" V 5704 5800 50 0000 C CNN
+F 1 "1k5" V 5795 5800 50 0000 C CNN
+F 2 "Resistor_SMD:R_0603_1608Metric" H 5900 5800 50 0001 C CNN
+F 3 "~" H 5900 5800 50 0001 C CNN
+ 1 5900 5800
+ 0 -1 1 0
+$EndComp
+Wire Wire Line
+ 6000 5800 6600 5800
+Wire Wire Line
+ 5800 5800 5300 5800
+Entry Wire Line
+ 4100 4300 4200 4400
+Entry Wire Line
+ 4100 4200 4200 4300
+Entry Wire Line
+ 4100 4400 4200 4500
+Wire Bus Line
+ 4200 4600 4400 4600
+Wire Wire Line
+ 3200 4200 4100 4200
+Wire Wire Line
+ 3200 4300 4100 4300
+Wire Wire Line
+ 3200 4400 4100 4400
+Text Notes 7800 1000 0 50 ~ 0
+f_c_lo = 13.6 Hz\nf_c_hi = 106 Hz\n\n(Dual pole RC with different first resistor)
+Wire Bus Line
+ 4200 4300 4200 4600
+Wire Bus Line
+ 7100 3500 7100 4300
+$EndSCHEMATC