EESchema Schematic File Version 2
LIBS:power
LIBS:device
LIBS:transistors
LIBS:conn
LIBS:linear
LIBS:regul
LIBS:74xx
LIBS:cmos4000
LIBS:adc-dac
LIBS:memory
LIBS:xilinx
LIBS:special
LIBS:microcontrollers
LIBS:dsp
LIBS:microchip
LIBS:analog_switches
LIBS:motorola
LIBS:texas
LIBS:intel
LIBS:audio
LIBS:interface
LIBS:digital-audio
LIBS:philips
LIBS:display
LIBS:cypress
LIBS:siliconi
LIBS:opto
LIBS:atmel
LIBS:contrib
LIBS:valves
LIBS:MLAB_IO
LIBS:MLAB_T
LIBS:Jumpers
LIBS:PCRD01A-cache
EELAYER 24 0
EELAYER END
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encoding utf-8
Sheet 1 1
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L R R?
U 1 1 547633B6
P 1550 3500
F 0 "R?" V 1630 3500 40 0000 C CNN
F 1 "4k7" V 1557 3501 40 0000 C CNN
F 2 "" V 1480 3500 30 0000 C CNN
F 3 "" H 1550 3500 30 0000 C CNN
1 1550 3500
0 1 1 0
$EndComp
$Comp
L R R?
U 1 1 547634EB
P 1550 4000
F 0 "R?" V 1630 4000 40 0000 C CNN
F 1 "4k7" V 1557 4001 40 0000 C CNN
F 2 "" V 1480 4000 30 0000 C CNN
F 3 "" H 1550 4000 30 0000 C CNN
1 1550 4000
0 1 1 0
$EndComp
$Comp
L C C?
U 1 1 5476354E
P 2000 3750
F 0 "C?" H 2000 3850 40 0000 L CNN
F 1 "4M7" H 2006 3665 40 0000 L CNN
F 2 "" H 2038 3600 30 0000 C CNN
F 3 "" H 2000 3750 60 0000 C CNN
1 2000 3750
1 0 0 -1
$EndComp
$Comp
L MAX4475 U?
U 1 1 547635BB
P 3450 4100
F 0 "U?" H 3600 4400 70 0000 C CNN
F 1 "MAX4475" H 3600 4300 70 0000 C CNN
F 2 "" H 3450 4100 60 0000 C CNN
F 3 "" H 3450 4100 60 0000 C CNN
1 3450 4100
1 0 0 -1
$EndComp
$Comp
L AD8692 U?
U 1 1 54763644
P 5850 4200
F 0 "U?" H 6000 4500 70 0000 C CNN
F 1 "AD8692" H 6000 4400 70 0000 C CNN
F 2 "" H 5850 4200 60 0000 C CNN
F 3 "" H 5850 4200 60 0000 C CNN
1 5850 4200
1 0 0 -1
$EndComp
$Comp
L DIODE D?
U 1 1 547637AA
P 2500 4000
F 0 "D?" H 2500 4100 40 0000 C CNN
F 1 "DIODE" H 2500 3900 40 0000 C CNN
F 2 "" H 2500 4000 60 0000 C CNN
F 3 "" H 2500 4000 60 0000 C CNN
1 2500 4000
-1 0 0 1
$EndComp
$Comp
L JFET_N Q?
U 1 1 54763801
P 2150 3050
F 0 "Q?" H 2053 3300 70 0000 C CNN
F 1 "BF862" H 2003 2803 60 0000 C CNN
F 2 "" H 2150 3050 60 0000 C CNN
F 3 "" H 2150 3050 60 0000 C CNN
1 2150 3050
-1 0 0 -1
$EndComp
$Comp
L R R?
U 1 1 54763891
P 3350 3050
F 0 "R?" V 3430 3050 40 0000 C CNN
F 1 "2M" V 3357 3051 40 0000 C CNN
F 2 "" V 3280 3050 30 0000 C CNN
F 3 "" H 3350 3050 30 0000 C CNN
1 3350 3050
0 1 1 0
$EndComp
$Comp
L C C?
U 1 1 547638F8
P 3300 2800
F 0 "C?" H 3300 2900 40 0000 L CNN
F 1 "2" H 3306 2715 40 0000 L CNN
F 2 "" H 3338 2650 30 0000 C CNN
F 3 "" H 3300 2800 60 0000 C CNN
1 3300 2800
0 1 1 0
$EndComp
$Comp
L C C?
U 1 1 54763980
P 4450 4100
F 0 "C?" H 4450 4200 40 0000 L CNN
F 1 "330k" H 4456 4015 40 0000 L CNN
F 2 "" H 4488 3950 30 0000 C CNN
F 3 "" H 4450 4100 60 0000 C CNN
1 4450 4100
0 1 1 0
$EndComp
$Comp
L R R?
U 1 1 54763A05
P 4850 4450
F 0 "R?" V 4930 4450 40 0000 C CNN
F 1 "3k3" V 4857 4451 40 0000 C CNN
F 2 "" V 4780 4450 30 0000 C CNN
F 3 "" H 4850 4450 30 0000 C CNN
1 4850 4450
-1 0 0 1
$EndComp
$Comp
L R R?
U 1 1 54763AA3
P 6650 4450
F 0 "R?" V 6730 4450 40 0000 C CNN
F 1 "10k" V 6657 4451 40 0000 C CNN
F 2 "" V 6580 4450 30 0000 C CNN
F 3 "" H 6650 4450 30 0000 C CNN
1 6650 4450
-1 0 0 1
$EndComp
$Comp
L R R?
U 1 1 54763AF2
P 6650 5150
F 0 "R?" V 6730 5150 40 0000 C CNN
F 1 "1k5" V 6657 5151 40 0000 C CNN
F 2 "" V 6580 5150 30 0000 C CNN
F 3 "" H 6650 5150 30 0000 C CNN
1 6650 5150
-1 0 0 1
$EndComp
$Comp
L C C?
U 1 1 54763B36
P 7000 4450
F 0 "C?" H 7000 4550 40 0000 L CNN
F 1 "510" H 7006 4365 40 0000 L CNN
F 2 "" H 7038 4300 30 0000 C CNN
F 3 "" H 7000 4450 60 0000 C CNN
1 7000 4450
-1 0 0 1
$EndComp
$Comp
L R R?
U 1 1 54763C78
P 7450 4200
F 0 "R?" V 7530 4200 40 0000 C CNN
F 1 "2k4" V 7457 4201 40 0000 C CNN
F 2 "" V 7380 4200 30 0000 C CNN
F 3 "" H 7450 4200 30 0000 C CNN
1 7450 4200
0 -1 -1 0
$EndComp
$Comp
L R R?
U 1 1 54763CCA
P 8150 4200
F 0 "R?" V 8230 4200 40 0000 C CNN
F 1 "2k2" V 8157 4201 40 0000 C CNN
F 2 "" V 8080 4200 30 0000 C CNN
F 3 "" H 8150 4200 30 0000 C CNN
1 8150 4200
0 -1 -1 0
$EndComp
$Comp
L C C?
U 1 1 54763D3A
P 7800 4450
F 0 "C?" H 7800 4550 40 0000 L CNN
F 1 "620" H 7806 4365 40 0000 L CNN
F 2 "" H 7838 4300 30 0000 C CNN
F 3 "" H 7800 4450 60 0000 C CNN
1 7800 4450
-1 0 0 1
$EndComp
$Comp
L C C?
U 1 1 54763DBA
P 9000 3300
F 0 "C?" H 9000 3400 40 0000 L CNN
F 1 "100" H 9006 3215 40 0000 L CNN
F 2 "" H 9038 3150 30 0000 C CNN
F 3 "" H 9000 3300 60 0000 C CNN
1 9000 3300
0 -1 -1 0
$EndComp
$Comp
L R R?
U 1 1 54763E8E
P 8600 3050
F 0 "R?" V 8680 3050 40 0000 C CNN
F 1 "4k7" V 8607 3051 40 0000 C CNN
F 2 "" V 8530 3050 30 0000 C CNN
F 3 "" H 8600 3050 30 0000 C CNN
1 8600 3050
0 -1 -1 0
$EndComp
Wire Wire Line
1800 3500 2000 3500
Wire Wire Line
2000 3150 2000 3550
Wire Wire Line
1800 4000 2300 4000
Wire Wire Line
2000 4000 2000 3950
Connection ~ 2000 3500
$Comp
L V- #PWR?
U 1 1 547641F4
P 3350 3550
F 0 "#PWR?" H 3350 3650 30 0001 C CNN
F 1 "V-" H 3350 3660 30 0000 C CNN
F 2 "" H 3350 3550 60 0000 C CNN
F 3 "" H 3350 3550 60 0000 C CNN
1 3350 3550
1 0 0 -1
$EndComp
Connection ~ 2000 4000
Wire Wire Line
2700 4000 2950 4000
Wire Wire Line
2850 2800 2850 4000
Connection ~ 2850 4000
Wire Wire Line
2400 3050 3100 3050
Connection ~ 2850 3050
Wire Wire Line
2850 2800 3100 2800
Wire Wire Line
3600 3050 4050 3050
Wire Wire Line
4050 2800 4050 4100
Wire Wire Line
3950 4100 4250 4100
Wire Wire Line
3500 2800 4050 2800
Connection ~ 4050 3050
$Comp
L R R?
U 1 1 5476469E
P 2650 4700
F 0 "R?" V 2730 4700 40 0000 C CNN
F 1 "2M" V 2657 4701 40 0000 C CNN
F 2 "" V 2580 4700 30 0000 C CNN
F 3 "" H 2650 4700 30 0000 C CNN
1 2650 4700
-1 0 0 1
$EndComp
$Comp
L C C?
U 1 1 5476470D
P 2950 4700
F 0 "C?" H 2950 4800 40 0000 L CNN
F 1 "12p" H 2956 4615 40 0000 L CNN
F 2 "" H 2988 4550 30 0000 C CNN
F 3 "" H 2950 4700 60 0000 C CNN
1 2950 4700
1 0 0 -1
$EndComp
Wire Wire Line
2950 4150 2650 4150
Wire Wire Line
2650 4150 2650 4450
Wire Wire Line
2950 4500 2950 4150
Connection ~ 2950 4150
$Comp
L GND #PWR?
U 1 1 54764791
P 2650 5050
F 0 "#PWR?" H 2650 5050 30 0001 C CNN
F 1 "GND" H 2650 4980 30 0001 C CNN
F 2 "" H 2650 5050 60 0000 C CNN
F 3 "" H 2650 5050 60 0000 C CNN
1 2650 5050
1 0 0 -1
$EndComp
$Comp
L GND #PWR?
U 1 1 547647A5
P 2950 5050
F 0 "#PWR?" H 2950 5050 30 0001 C CNN
F 1 "GND" H 2950 4980 30 0001 C CNN
F 2 "" H 2950 5050 60 0000 C CNN
F 3 "" H 2950 5050 60 0000 C CNN
1 2950 5050
1 0 0 -1
$EndComp
Wire Wire Line
2650 5050 2650 4950
Wire Wire Line
2950 5050 2950 4900
Wire Wire Line
3350 3550 3350 3700
Wire Wire Line
3350 4500 3350 4600
$Comp
L V+ #PWR?
U 1 1 54764B7E
P 3350 4600
F 0 "#PWR?" H 3350 4700 30 0001 C CNN
F 1 "V+" H 3350 4710 30 0000 C CNN
F 2 "" H 3350 4600 60 0000 C CNN
F 3 "" H 3350 4600 60 0000 C CNN
1 3350 4600
-1 0 0 1
$EndComp
$Comp
L V+ #PWR?
U 1 1 54764D10
P 2000 2650
F 0 "#PWR?" H 2000 2750 30 0001 C CNN
F 1 "V+" H 2000 2760 30 0000 C CNN
F 2 "" H 2000 2650 60 0000 C CNN
F 3 "" H 2000 2650 60 0000 C CNN
1 2000 2650
1 0 0 -1
$EndComp
Wire Wire Line
2000 2700 2000 2650
Wire Wire Line
5350 4300 5350 4800
Wire Wire Line
5350 4800 7000 4800
Wire Wire Line
6650 4700 6650 4900
Connection ~ 6650 4800
Wire Wire Line
6350 4200 7200 4200
Wire Wire Line
7000 4200 7000 4250
Connection ~ 6650 4200
Wire Wire Line
7000 4800 7000 4650
Connection ~ 4050 4100
Wire Wire Line
4650 4100 5350 4100
Wire Wire Line
4850 4200 4850 4100
Connection ~ 4850 4100
$Comp
L GND #PWR?
U 1 1 547653E5
P 4850 4750
F 0 "#PWR?" H 4850 4750 30 0001 C CNN
F 1 "GND" H 4850 4680 30 0001 C CNN
F 2 "" H 4850 4750 60 0000 C CNN
F 3 "" H 4850 4750 60 0000 C CNN
1 4850 4750
1 0 0 -1
$EndComp
Wire Wire Line
4850 4750 4850 4700
$Comp
L GND #PWR?
U 1 1 547654DE
P 6650 5450
F 0 "#PWR?" H 6650 5450 30 0001 C CNN
F 1 "GND" H 6650 5380 30 0001 C CNN
F 2 "" H 6650 5450 60 0000 C CNN
F 3 "" H 6650 5450 60 0000 C CNN
1 6650 5450
1 0 0 -1
$EndComp
Wire Wire Line
6650 5450 6650 5400
$Comp
L V- #PWR?
U 1 1 54765630
P 5750 3750
F 0 "#PWR?" H 5750 3850 30 0001 C CNN
F 1 "V-" H 5750 3860 30 0000 C CNN
F 2 "" H 5750 3750 60 0000 C CNN
F 3 "" H 5750 3750 60 0000 C CNN
1 5750 3750
1 0 0 -1
$EndComp
$Comp
L V+ #PWR?
U 1 1 54765667
P 5750 4650
F 0 "#PWR?" H 5750 4750 30 0001 C CNN
F 1 "V+" H 5750 4760 30 0000 C CNN
F 2 "" H 5750 4650 60 0000 C CNN
F 3 "" H 5750 4650 60 0000 C CNN
1 5750 4650
-1 0 0 1
$EndComp
Wire Wire Line
5750 4650 5750 4600
Wire Wire Line
5750 3800 5750 3750
Connection ~ 7000 4200
Wire Wire Line
7700 4200 7900 4200
Wire Wire Line
7800 3050 7800 4250
Connection ~ 7800 4200
$Comp
L GND #PWR?
U 1 1 54765C64
P 7800 4750
F 0 "#PWR?" H 7800 4750 30 0001 C CNN
F 1 "GND" H 7800 4680 30 0001 C CNN
F 2 "" H 7800 4750 60 0000 C CNN
F 3 "" H 7800 4750 60 0000 C CNN
1 7800 4750
1 0 0 -1
$EndComp
$Comp
L GND #PWR?
U 1 1 54765C85
P 8600 4100
F 0 "#PWR?" H 8600 4100 30 0001 C CNN
F 1 "GND" H 8600 4030 30 0001 C CNN
F 2 "" H 8600 4100 60 0000 C CNN
F 3 "" H 8600 4100 60 0000 C CNN
1 8600 4100
1 0 0 -1
$EndComp
$Comp
L GND #PWR?
U 1 1 54765CA6
P 10150 4700
F 0 "#PWR?" H 10150 4700 30 0001 C CNN
F 1 "GND" H 10150 4630 30 0001 C CNN
F 2 "" H 10150 4700 60 0000 C CNN
F 3 "" H 10150 4700 60 0000 C CNN
1 10150 4700
1 0 0 -1
$EndComp
Wire Wire Line
7800 4750 7800 4650
Wire Wire Line
9600 3050 9600 4100
Wire Wire Line
9600 3300 9200 3300
Wire Wire Line
8850 3050 9600 3050
Connection ~ 9600 3300
Wire Wire Line
8800 3300 8500 3300
$Comp
L V+ #PWR?
U 1 1 5476619B
P 9000 3650
F 0 "#PWR?" H 9000 3750 30 0001 C CNN
F 1 "V+" H 9000 3760 30 0000 C CNN
F 2 "" H 9000 3650 60 0000 C CNN
F 3 "" H 9000 3650 60 0000 C CNN
1 9000 3650
1 0 0 -1
$EndComp
$Comp
L V- #PWR?
U 1 1 547662DA
P 9000 4550
F 0 "#PWR?" H 9000 4650 30 0001 C CNN
F 1 "V-" H 9000 4660 30 0000 C CNN
F 2 "" H 9000 4550 60 0000 C CNN
F 3 "" H 9000 4550 60 0000 C CNN
1 9000 4550
-1 0 0 1
$EndComp
Wire Wire Line
9000 4550 9000 4500
Wire Wire Line
9000 3700 9000 3650
$Comp
L C C?
U 1 1 54766490
P 9850 4100
F 0 "C?" H 9850 4200 40 0000 L CNN
F 1 "330k" H 9856 4015 40 0000 L CNN
F 2 "" H 9888 3950 30 0000 C CNN
F 3 "" H 9850 4100 60 0000 C CNN
1 9850 4100
0 -1 -1 0
$EndComp
$Comp
L R R?
U 1 1 547664D3
P 10150 4400
F 0 "R?" V 10230 4400 40 0000 C CNN
F 1 "10k" V 10157 4401 40 0000 C CNN
F 2 "" V 10080 4400 30 0000 C CNN
F 3 "" H 10150 4400 30 0000 C CNN
1 10150 4400
1 0 0 -1
$EndComp
$Comp
L CONN1_1 J?
U 1 1 54766579
P 10550 4150
F 0 "J?" H 10600 4200 50 0000 C CNN
F 1 "OUT" H 10650 4100 40 0000 C CNN
F 2 "" H 10600 4100 60 0000 C CNN
F 3 "" H 10600 4100 60 0000 C CNN
1 10550 4150
1 0 0 -1
$EndComp
Wire Wire Line
10050 4100 10250 4100
Wire Wire Line
10150 4150 10150 4100
Connection ~ 10150 4100
Wire Wire Line
9600 4100 9650 4100
Connection ~ 9600 4100
Wire Wire Line
10150 4700 10150 4650
$Comp
L V- #PWR?
U 1 1 54766B71
P 1200 3500
F 0 "#PWR?" H 1200 3600 30 0001 C CNN
F 1 "V-" H 1200 3610 30 0000 C CNN
F 2 "" H 1200 3500 60 0000 C CNN
F 3 "" H 1200 3500 60 0000 C CNN
1 1200 3500
0 -1 -1 0
$EndComp
$Comp
L CONN1_1 J?
U 1 1 54766BD9
P 950 3950
F 0 "J?" H 1000 4000 50 0000 C CNN
F 1 "+Ubias" H 1050 3900 40 0000 C CNN
F 2 "" H 1000 3900 60 0000 C CNN
F 3 "" H 1000 3900 60 0000 C CNN
1 950 3950
-1 0 0 1
$EndComp
Wire Wire Line
1250 4000 1300 4000
Wire Wire Line
1300 3500 1200 3500
Wire Wire Line
8600 4100 8600 4000
Wire Wire Line
8400 4200 8600 4200
Wire Wire Line
7800 3050 8350 3050
Wire Wire Line
8500 3300 8500 4200
Connection ~ 8500 4200
$Comp
L AD8692 U?
U 1 1 5476E2B8
P 9100 4100
F 0 "U?" H 9250 4400 70 0000 C CNN
F 1 "AD8692" H 9250 4300 70 0000 C CNN
F 2 "" H 9100 4100 60 0000 C CNN
F 3 "" H 9100 4100 60 0000 C CNN
1 9100 4100
1 0 0 -1
$EndComp
Text Notes 2200 2350 0 60 ~ 0
low noise charge sensitive amplifier
Text Notes 4450 3850 0 60 ~ 0
highpass\n1 kHz
Text Notes 5500 3450 0 60 ~ 0
amplifier 7,7x
Text Notes 8200 2800 0 60 ~ 0
2nd lowpass 200 kHz\nwith gain 2x
Text Notes 9900 3750 0 60 ~ 0
highpass\n300 Hz
$Comp
L JUMP_5X2 J?
U 1 1 5476EF1F
P 1250 6650
F 0 "J?" H 900 6900 50 0000 C CNN
F 1 "JUMP_5X2" V 1200 6600 40 0000 C CNN
F 2 "" H 1250 6650 60 0000 C CNN
F 3 "" H 1250 6650 60 0000 C CNN
1 1250 6650
-1 0 0 1
$EndComp
$Comp
L V- #PWR?
U 1 1 5476F198
P 2000 6300
F 0 "#PWR?" H 2000 6400 30 0001 C CNN
F 1 "V-" H 2000 6410 30 0000 C CNN
F 2 "" H 2000 6300 60 0000 C CNN
F 3 "" H 2000 6300 60 0000 C CNN
1 2000 6300
1 0 0 -1
$EndComp
$Comp
L V+ #PWR?
U 1 1 5476F410
P 1800 6300
F 0 "#PWR?" H 1800 6400 30 0001 C CNN
F 1 "V+" H 1800 6410 30 0000 C CNN
F 2 "" H 1800 6300 60 0000 C CNN
F 3 "" H 1800 6300 60 0000 C CNN
1 1800 6300
1 0 0 -1
$EndComp
$Comp
L GND #PWR?
U 1 1 5476F692
P 1750 6900
F 0 "#PWR?" H 1750 6900 30 0001 C CNN
F 1 "GND" H 1750 6830 30 0001 C CNN
F 2 "" H 1750 6900 60 0000 C CNN
F 3 "" H 1750 6900 60 0000 C CNN
1 1750 6900
1 0 0 -1
$EndComp
Wire Wire Line
1650 6600 1800 6600
Wire Wire Line
1800 6600 1800 6300
Wire Wire Line
1650 6500 1700 6500
Wire Wire Line
1700 6500 1700 6700
Wire Wire Line
1650 6700 2000 6700
Wire Wire Line
2000 6700 2000 6300
Connection ~ 1700 6700
Wire Wire Line
1650 6400 1750 6400
Wire Wire Line
1750 6400 1750 6900
Wire Wire Line
1750 6800 1650 6800
Connection ~ 1750 6800
Text Notes 1500 6100 0 60 ~ 0
+/- 2,4V
$Comp
L _ P?
U 1 1 5476FB64
P 9950 800
F 0 "P?" H 10000 900 50 0000 C CNN
F 1 "_" H 9950 850 40 0000 C CNN
F 2 "" H 10200 650 60 0000 C CNN
F 3 "" H 10200 650 60 0000 C CNN
1 9950 800
-1 0 0 1
$EndComp
$Comp
L _ P?
U 1 1 5476FD65
P 9950 1000
F 0 "P?" H 10000 1100 50 0000 C CNN
F 1 "_" H 9950 1050 40 0000 C CNN
F 2 "" H 10200 850 60 0000 C CNN
F 3 "" H 10200 850 60 0000 C CNN
1 9950 1000
-1 0 0 1
$EndComp
$Comp
L _ P?
U 1 1 5476FD9A
P 10500 800
F 0 "P?" H 10550 900 50 0000 C CNN
F 1 "_" H 10500 850 40 0000 C CNN
F 2 "" H 10750 650 60 0000 C CNN
F 3 "" H 10750 650 60 0000 C CNN
1 10500 800
-1 0 0 1
$EndComp
$Comp
L _ P?
U 1 1 5476FDEC
P 10500 1000
F 0 "P?" H 10550 1100 50 0000 C CNN
F 1 "_" H 10500 1050 40 0000 C CNN
F 2 "" H 10750 850 60 0000 C CNN
F 3 "" H 10750 850 60 0000 C CNN
1 10500 1000
-1 0 0 1
$EndComp
$Comp
L GND #PWR?
U 1 1 5476FFB6
P 10300 1200
F 0 "#PWR?" H 10300 1200 30 0001 C CNN
F 1 "GND" H 10300 1130 30 0001 C CNN
F 2 "" H 10300 1200 60 0000 C CNN
F 3 "" H 10300 1200 60 0000 C CNN
1 10300 1200
1 0 0 -1
$EndComp
$Comp
L GND #PWR?
U 1 1 54770192
P 10850 1200
F 0 "#PWR?" H 10850 1200 30 0001 C CNN
F 1 "GND" H 10850 1130 30 0001 C CNN
F 2 "" H 10850 1200 60 0000 C CNN
F 3 "" H 10850 1200 60 0000 C CNN
1 10850 1200
1 0 0 -1
$EndComp
Wire Wire Line
10250 850 10300 850
Wire Wire Line
10300 850 10300 1200
Wire Wire Line
10250 1050 10300 1050
Connection ~ 10300 1050
Wire Wire Line
10800 850 10850 850
Wire Wire Line
10850 850 10850 1200
Wire Wire Line
10800 1050 10850 1050
Connection ~ 10850 1050
$EndSCHEMATC