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:2.4GHZ_2450FB15L0001
LIBS:6multi
LIBS:25q40b
LIBS:1206network
LIBS:4427
LIBS:5050RGB
LIBS:7805
LIBS:7805to220
LIBS:a4447sljtr
LIBS:adc-ltc2450
LIBS:ap1117
LIBS:atmega48_88_168_328_tqfp32
LIBS:atmega1284rfr2
LIBS:atmegax8pb
LIBS:atmegaxu2
LIBS:atmel_kk
LIBS:attiny441
LIBS:attiny441-qfn
LIBS:attinyx4
LIBS:attinyx5
LIBS:avr6pin
LIBS:avr_usb_3v3-cache
LIBS:BELFuse_Ethernet
LIBS:bluetoothedpa
LIBS:bmp085
LIBS:bridge-MB2S-TP
LIBS:crystal-4p
LIBS:dmp2240udm
LIBS:ds2438z
LIBS:enc424j600
LIBS:esp8266ex
LIBS:esp8266-wi07-6
LIBS:exb-a
LIBS:halleffect-tcs20dlr
LIBS:lm386
LIBS:lsm9ds0
LIBS:lsm9ds1
LIBS:lsm303c
LIBS:lsm303d
LIBS:lsm303dlhc
LIBS:ltc2471cms
LIBS:ltv-846s
LIBS:max31855
LIBS:mcp1824_ct
LIBS:mcp23008-qfn
LIBS:mcp23008-soic
LIBS:mfrc522
LIBS:microsd_1050270001
LIBS:mmpq2907a
LIBS:mosdriver_ncp5901bmntbg
LIBS:mosfet-lfpak56
LIBS:mosfetx2vdfn8
LIBS:mos_p_d2
LIBS:neon14
LIBS:network0606
LIBS:nor-nc7sz02p5x
LIBS:npn-2222
LIBS:opa832
LIBS:opto2-ltv-826s
LIBS:ov2640_ribbon
LIBS:pcbbom
LIBS:photomos
LIBS:resonator6smd
LIBS:rn-cay16-f4
LIBS:rs485-isl3170
LIBS:stm32f207
LIBS:stm32f301
LIBS:stm32f303
LIBS:tcs3x7x
LIBS:um5k1ntr
LIBS:ws2812b
LIBS:ws_switch
LIBS:zener-sot23-3
LIBS:mag3110
LIBS:stepcheck-cache
EELAYER 27 0
EELAYER END
$Descr USLetter 11000 8500
encoding utf-8
Sheet 1 1
Title "Stepcheck"
Date "6 jun 2015"
Rev "-"
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L LTV-846S U4
U 1 1 5562B144
P 7700 2150
F 0 "U4" H 7700 1700 60  0000 C CNN
F 1 "LTV-846S" H 7700 2600 60  0000 C CNN
F 2 "16-SMD" H 7800 1950 60  0000 C CNN
F 3 "" H 7800 1950 60  0000 C CNN
	1    7700 2150
	-1   0    0    1   
$EndComp
$Comp
L ATTINYX4 U1
U 1 1 5562B156
P 3900 2150
F 0 "U1" H 3900 2300 60  0000 C CNN
F 1 "ATTINY44A" H 3900 2200 60  0000 C CNN
F 2 "SO14E" H 3900 2150 60  0000 C CNN
F 3 "" H 3900 2150 60  0000 C CNN
	1    3900 2150
	1    0    0    -1  
$EndComp
$Comp
L MAG3110 U2
U 1 1 5562B396
P 4300 3850
F 0 "U2" H 4550 4150 60  0000 C CNN
F 1 "MAG3110" H 4250 4150 60  0000 C CNN
F 2 "DFN10x.4" H 4400 3550 60  0000 C CNN
F 3 "~" H 4500 3750 60  0000 C CNN
	1    4300 3850
	1    0    0    -1  
$EndComp
$Comp
L AVRISP6 J1
U 1 1 5562B3A5
P 4300 3100
F 0 "J1" H 4100 3350 60  0000 C CNN
F 1 "AVRISP6" H 4450 2800 60  0000 C CNN
F 2 "RIBBON6SMT" H 4500 3350 60  0000 C CNN
F 3 "~" H 4300 3100 60  0000 C CNN
	1    4300 3100
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR01
U 1 1 5562B3CD
P 4900 3250
F 0 "#PWR01" H 4900 3250 30  0001 C CNN
F 1 "GND" H 4900 3180 30  0001 C CNN
F 2 "" H 4900 3250 60  0000 C CNN
F 3 "" H 4900 3250 60  0000 C CNN
	1    4900 3250
	1    0    0    -1  
$EndComp
$Comp
L +5V #PWR02
U 1 1 5562B3F5
P 4900 2950
F 0 "#PWR02" H 4900 3040 20  0001 C CNN
F 1 "+5V" H 4900 3040 30  0000 C CNN
F 2 "" H 4900 2950 60  0000 C CNN
F 3 "" H 4900 2950 60  0000 C CNN
	1    4900 2950
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR03
U 1 1 5562B4B2
P 5900 1900
F 0 "#PWR03" H 5900 1900 30  0001 C CNN
F 1 "GND" H 5900 1830 30  0001 C CNN
F 2 "" H 5900 1900 60  0000 C CNN
F 3 "" H 5900 1900 60  0000 C CNN
	1    5900 1900
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR04
U 1 1 5562B6BA
P 7000 2550
F 0 "#PWR04" H 7000 2550 30  0001 C CNN
F 1 "GND" H 7000 2480 30  0001 C CNN
F 2 "" H 7000 2550 60  0000 C CNN
F 3 "" H 7000 2550 60  0000 C CNN
	1    7000 2550
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR05
U 1 1 5562B75E
P 3700 4100
F 0 "#PWR05" H 3700 4100 30  0001 C CNN
F 1 "GND" H 3700 4030 30  0001 C CNN
F 2 "" H 3700 4100 60  0000 C CNN
F 3 "" H 3700 4100 60  0000 C CNN
	1    3700 4100
	1    0    0    -1  
$EndComp
$Comp
L C C1
U 1 1 5562B7B1
P 3350 3650
F 0 "C1" H 3350 3750 40  0000 L CNN
F 1 ".1u" H 3356 3565 40  0000 L CNN
F 2 "SM0603" H 3388 3500 30  0000 C CNN
F 3 "~" H 3350 3650 60  0000 C CNN
	1    3350 3650
	0    -1   -1   0   
$EndComp
$Comp
L C C2
U 1 1 5562B853
P 3350 3950
F 0 "C2" H 3350 4050 40  0000 L CNN
F 1 ".1u" H 3356 3865 40  0000 L CNN
F 2 "SM0603" H 3388 3800 30  0000 C CNN
F 3 "~" H 3350 3950 60  0000 C CNN
	1    3350 3950
	0    -1   -1   0   
$EndComp
$Comp
L GND #PWR06
U 1 1 5562B8F6
P 3050 4100
F 0 "#PWR06" H 3050 4100 30  0001 C CNN
F 1 "GND" H 3050 4030 30  0001 C CNN
F 2 "" H 3050 4100 60  0000 C CNN
F 3 "" H 3050 4100 60  0000 C CNN
	1    3050 4100
	1    0    0    -1  
$EndComp
$Comp
L C C3
U 1 1 5562BBD5
P 5300 4150
F 0 "C3" H 5300 4250 40  0000 L CNN
F 1 ".1u" H 5306 4065 40  0000 L CNN
F 2 "SM0603" H 5338 4000 30  0000 C CNN
F 3 "~" H 5300 4150 60  0000 C CNN
	1    5300 4150
	-1   0    0    1   
$EndComp
$Comp
L C C4
U 1 1 5562BBDB
P 5550 4150
F 0 "C4" H 5550 4250 40  0000 L CNN
F 1 "10u" H 5556 4065 40  0000 L CNN
F 2 "SM0603" H 5588 4000 30  0000 C CNN
F 3 "~" H 5550 4150 60  0000 C CNN
	1    5550 4150
	-1   0    0    1   
$EndComp
$Comp
L GND #PWR07
U 1 1 5562BC5D
P 5400 4450
F 0 "#PWR07" H 5400 4450 30  0001 C CNN
F 1 "GND" H 5400 4380 30  0001 C CNN
F 2 "" H 5400 4450 60  0000 C CNN
F 3 "" H 5400 4450 60  0000 C CNN
	1    5400 4450
	1    0    0    -1  
$EndComp
$Comp
L R R2
U 1 1 5562BE70
P 4800 4500
F 0 "R2" V 4880 4500 40  0000 C CNN
F 1 "4.7k" V 4807 4501 40  0000 C CNN
F 2 "SM0603" V 4730 4500 30  0000 C CNN
F 3 "~" H 4800 4500 30  0000 C CNN
	1    4800 4500
	0    -1   -1   0   
$EndComp
$Comp
L R R1
U 1 1 5562BE7F
P 4700 4650
F 0 "R1" V 4780 4650 40  0000 C CNN
F 1 "4.7k" V 4707 4651 40  0000 C CNN
F 2 "SM0603" V 4630 4650 30  0000 C CNN
F 3 "~" H 4700 4650 30  0000 C CNN
	1    4700 4650
	0    -1   -1   0   
$EndComp
$Comp
L C C5
U 1 1 5562C05D
P 6650 1800
F 0 "C5" H 6650 1900 40  0000 L CNN
F 1 ".1u" H 6656 1715 40  0000 L CNN
F 2 "SM0603" H 6688 1650 30  0000 C CNN
F 3 "~" H 6650 1800 60  0000 C CNN
	1    6650 1800
	0    -1   -1   0   
$EndComp
$Comp
L C C6
U 1 1 5562C080
P 6650 2000
F 0 "C6" H 6650 2100 40  0000 L CNN
F 1 ".1u" H 6656 1915 40  0000 L CNN
F 2 "SM0603" H 6688 1850 30  0000 C CNN
F 3 "~" H 6650 2000 60  0000 C CNN
	1    6650 2000
	0    -1   -1   0   
$EndComp
$Comp
L C C7
U 1 1 5562C086
P 6650 2200
F 0 "C7" H 6650 2300 40  0000 L CNN
F 1 ".1u" H 6656 2115 40  0000 L CNN
F 2 "SM0603" H 6688 2050 30  0000 C CNN
F 3 "~" H 6650 2200 60  0000 C CNN
	1    6650 2200
	0    -1   -1   0   
$EndComp
$Comp
L C C8
U 1 1 5562C08C
P 6650 2400
F 0 "C8" H 6650 2500 40  0000 L CNN
F 1 ".1u" H 6656 2315 40  0000 L CNN
F 2 "SM0603" H 6688 2250 30  0000 C CNN
F 3 "~" H 6650 2400 60  0000 C CNN
	1    6650 2400
	0    -1   -1   0   
$EndComp
$Comp
L C C9
U 1 1 5562C852
P 7650 3300
F 0 "C9" H 7650 3400 40  0000 L CNN
F 1 "1u" H 7656 3215 40  0000 L CNN
F 2 "SM0603" H 7688 3150 30  0000 C CNN
F 3 "~" H 7650 3300 60  0000 C CNN
	1    7650 3300
	-1   0    0    1   
$EndComp
$Comp
L C C10
U 1 1 5562C864
P 7850 3300
F 0 "C10" H 7850 3400 40  0000 L CNN
F 1 "10u" H 7856 3215 40  0000 L CNN
F 2 "SM0603" H 7888 3150 30  0000 C CNN
F 3 "~" H 7850 3300 60  0000 C CNN
	1    7850 3300
	-1   0    0    1   
$EndComp
$Comp
L +5V #PWR08
U 1 1 5562C971
P 7750 3050
F 0 "#PWR08" H 7750 3140 20  0001 C CNN
F 1 "+5V" H 7750 3140 30  0000 C CNN
F 2 "" H 7750 3050 60  0000 C CNN
F 3 "" H 7750 3050 60  0000 C CNN
	1    7750 3050
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR09
U 1 1 5562C9F6
P 7750 3550
F 0 "#PWR09" H 7750 3550 30  0001 C CNN
F 1 "GND" H 7750 3480 30  0001 C CNN
F 2 "" H 7750 3550 60  0000 C CNN
F 3 "" H 7750 3550 60  0000 C CNN
	1    7750 3550
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR010
U 1 1 5562CBA1
P 5000 3450
F 0 "#PWR010" H 5000 3410 30  0001 C CNN
F 1 "+3.3V" H 5000 3560 30  0000 C CNN
F 2 "" H 5000 3450 60  0000 C CNN
F 3 "" H 5000 3450 60  0000 C CNN
	1    5000 3450
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR011
U 1 1 5562CBAE
P 2050 1800
F 0 "#PWR011" H 2050 1760 30  0001 C CNN
F 1 "+3.3V" H 2050 1910 30  0000 C CNN
F 2 "" H 2050 1800 60  0000 C CNN
F 3 "" H 2050 1800 60  0000 C CNN
	1    2050 1800
	1    0    0    -1  
$EndComp
$Comp
L MCP1824 U3
U 1 1 5562CC58
P 6350 3600
F 0 "U3" H 6100 3900 60  0000 C CNN
F 1 "MCP1824" H 6450 3300 60  0000 C CNN
F 2 "SOT23-5" H 6350 3600 60  0000 C CNN
F 3 "" H 6350 3600 60  0000 C CNN
	1    6350 3600
	-1   0    0    1   
$EndComp
$Comp
L +5V #PWR012
U 1 1 5562CCF1
P 7050 3450
F 0 "#PWR012" H 7050 3540 20  0001 C CNN
F 1 "+5V" H 7050 3540 30  0000 C CNN
F 2 "" H 7050 3450 60  0000 C CNN
F 3 "" H 7050 3450 60  0000 C CNN
	1    7050 3450
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR013
U 1 1 5562CE01
P 7000 3800
F 0 "#PWR013" H 7000 3800 30  0001 C CNN
F 1 "GND" H 7000 3730 30  0001 C CNN
F 2 "" H 7000 3800 60  0000 C CNN
F 3 "" H 7000 3800 60  0000 C CNN
	1    7000 3800
	1    0    0    -1  
$EndComp
$Comp
L R J2
U 1 1 5562D060
P 5700 4650
F 0 "J2" V 5780 4650 40  0000 C CNN
F 1 "0" V 5707 4651 40  0000 C CNN
F 2 "SM0603" V 5630 4650 30  0000 C CNN
F 3 "~" H 5700 4650 30  0000 C CNN
	1    5700 4650
	0    -1   -1   0   
$EndComp
$Comp
L CONN_4 P1
U 1 1 5562D1BE
P 9500 2150
F 0 "P1" V 9450 2150 50  0000 C CNN
F 1 "STEP" V 9550 2150 50  0000 C CNN
F 2 "PHOENIX1935187" H 9500 2150 60  0000 C CNN
F 3 "" H 9500 2150 60  0000 C CNN
	1    9500 2150
	1    0    0    1   
$EndComp
Wire Wire Line
	8250 1900 8250 2000
Wire Wire Line
	8400 2100 8250 2100
Wire Wire Line
	8400 1800 8400 2100
Wire Wire Line
	8400 1800 8250 1800
Wire Wire Line
	8250 2200 8400 2200
Wire Wire Line
	8400 2200 8400 2500
Wire Wire Line
	8400 2500 8250 2500
Wire Wire Line
	8250 2300 8250 2400
Connection ~ 8250 2350
Wire Wire Line
	8400 2300 8600 2300
Connection ~ 8400 2300
Wire Wire Line
	8250 1950 8600 1950
Connection ~ 8250 1950
Connection ~ 8400 1900
Wire Wire Line
	6850 1800 7150 1800
Wire Wire Line
	7000 1800 7000 2550
Wire Wire Line
	7150 2400 7000 2400
Connection ~ 7000 2400
Wire Wire Line
	7000 2200 7150 2200
Connection ~ 7000 2200
Wire Wire Line
	7150 2000 7000 2000
Connection ~ 7000 2000
Wire Wire Line
	4850 3200 4900 3200
Wire Wire Line
	4900 3200 4900 3250
Wire Wire Line
	4900 2950 4900 3000
Wire Wire Line
	4900 3000 4850 3000
Wire Wire Line
	3750 3000 3450 3000
Wire Wire Line
	3450 3000 3450 2700
Wire Wire Line
	3450 2700 5700 2700
Wire Wire Line
	5700 2700 5700 2450
Wire Wire Line
	5700 2350 5750 2350
Wire Wire Line
	5750 2350 5750 2650
Wire Wire Line
	5750 2650 3400 2650
Wire Wire Line
	3400 2650 3400 3100
Wire Wire Line
	3400 3100 3750 3100
Wire Wire Line
	3750 3200 1950 3200
Wire Wire Line
	1950 3200 1950 2150
Wire Wire Line
	1950 2150 2100 2150
Wire Wire Line
	4850 3100 5050 3100
Wire Wire Line
	5050 3100 5050 2750
Wire Wire Line
	5050 2750 2100 2750
Wire Wire Line
	2100 2750 2100 2450
Wire Wire Line
	5900 1900 5900 1850
Wire Wire Line
	5900 1850 5700 1850
Wire Wire Line
	2050 1800 2100 1800
Wire Wire Line
	2100 1800 2100 1850
Wire Wire Line
	1700 2050 1700 4200
Wire Wire Line
	1700 4200 4950 4200
Wire Wire Line
	4950 4200 4950 4050
Wire Wire Line
	4950 4050 4850 4050
Wire Wire Line
	4850 3950 5000 3950
Wire Wire Line
	5000 3950 5000 4300
Wire Wire Line
	5000 4300 1600 4300
Wire Wire Line
	1600 4300 1600 1950
Wire Wire Line
	6100 2500 7150 2500
Wire Wire Line
	6100 2500 6100 2250
Wire Wire Line
	6100 2250 5700 2250
Wire Wire Line
	5700 2150 6200 2150
Wire Wire Line
	6200 2150 6200 2300
Wire Wire Line
	6200 2300 7150 2300
Wire Wire Line
	6250 2100 7150 2100
Wire Wire Line
	6250 2100 6250 2050
Wire Wire Line
	6250 2050 5700 2050
Wire Wire Line
	5700 1950 6300 1950
Wire Wire Line
	6300 1950 6300 1900
Wire Wire Line
	6300 1900 7150 1900
Wire Wire Line
	4850 3650 4850 3600
Wire Wire Line
	4850 3600 4950 3600
Wire Wire Line
	4950 3600 4950 3800
Wire Wire Line
	3700 3750 3750 3750
Wire Wire Line
	3700 4100 3700 4050
Wire Wire Line
	3700 4050 3750 4050
Wire Wire Line
	3550 3650 3750 3650
Wire Wire Line
	3550 3950 3750 3950
Wire Wire Line
	3050 3650 3050 4100
Wire Wire Line
	3050 3650 3150 3650
Wire Wire Line
	3150 3950 3050 3950
Connection ~ 3050 3950
Wire Wire Line
	3700 3750 3700 3500
Wire Wire Line
	3700 3500 5100 3500
Wire Wire Line
	5100 3500 5100 3850
Wire Wire Line
	4850 3850 5550 3850
Wire Wire Line
	5100 3600 5250 3600
Connection ~ 5100 3600
Wire Wire Line
	5400 4450 5400 4350
Wire Wire Line
	5550 3850 5550 3950
Connection ~ 5100 3850
Wire Wire Line
	5300 3850 5300 3950
Connection ~ 5300 3850
Wire Wire Line
	4550 4500 4550 4300
Connection ~ 4550 4300
Wire Wire Line
	4450 4200 4450 4650
Connection ~ 4450 4200
Wire Wire Line
	5050 4650 4950 4650
Wire Wire Line
	5050 4500 5050 4650
Wire Wire Line
	5050 4550 5150 4550
Wire Wire Line
	5150 4550 5150 3850
Connection ~ 5150 3850
Connection ~ 5050 4550
Wire Wire Line
	6900 2400 6850 2400
Wire Wire Line
	6900 1800 6900 2400
Connection ~ 7000 1800
Connection ~ 6900 1800
Wire Wire Line
	6850 2200 6900 2200
Connection ~ 6900 2200
Wire Wire Line
	6850 2000 6900 2000
Connection ~ 6900 2000
Wire Wire Line
	6450 1800 6450 1900
Connection ~ 6450 1900
Wire Wire Line
	6450 2000 6450 2100
Connection ~ 6450 2100
Wire Wire Line
	6450 2200 6450 2300
Connection ~ 6450 2300
Wire Wire Line
	6450 2400 6450 2500
Connection ~ 6450 2500
Wire Wire Line
	1700 2050 2100 2050
Wire Wire Line
	1600 1950 2100 1950
Wire Wire Line
	7650 3100 7850 3100
Wire Wire Line
	7650 3500 7850 3500
Wire Wire Line
	7750 3050 7750 3100
Connection ~ 7750 3100
Wire Wire Line
	7750 3500 7750 3550
Connection ~ 7750 3500
Wire Wire Line
	5000 3450 5000 3500
Connection ~ 5000 3500
Wire Wire Line
	5750 3700 5250 3700
Wire Wire Line
	5250 3700 5250 3600
Wire Wire Line
	6950 3500 7050 3500
Wire Wire Line
	7050 3450 7050 3700
Wire Wire Line
	7050 3700 6950 3700
Connection ~ 7050 3500
Wire Wire Line
	7000 3800 7000 3600
Wire Wire Line
	7000 3600 6950 3600
Wire Wire Line
	5300 4350 5450 4350
Wire Wire Line
	4950 3800 5700 3800
Wire Wire Line
	5700 3800 5700 4350
Wire Wire Line
	5550 4350 5950 4350
Wire Wire Line
	5450 4350 5450 4650
Connection ~ 5400 4350
Wire Wire Line
	5950 4350 5950 4650
Connection ~ 5700 4350
Wire Wire Line
	9150 2100 8600 2100
Wire Wire Line
	8600 2100 8600 1950
Wire Wire Line
	9150 1900 9150 2000
Wire Wire Line
	8600 2300 8600 2200
Wire Wire Line
	8600 2200 9150 2200
Wire Wire Line
	9150 2350 9150 2300
$Comp
L 5050RGB D1
U 1 1 5562D617
P 1150 2950
F 0 "D1" H 1300 3150 60  0000 C CNN
F 1 "5050RGB" H 950 3150 60  0000 C CNN
F 2 "5050RGB" H 1150 2950 60  0000 C CNN
F 3 "~" H 1150 2950 60  0000 C CNN
	1    1150 2950
	0    1    1    0   
$EndComp
Wire Wire Line
	1150 2450 1150 2350
Wire Wire Line
	1150 2350 2100 2350
Wire Wire Line
	2100 2250 1050 2250
Wire Wire Line
	1050 2250 1050 2450
$Comp
L R R3
U 1 1 5562D7E8
P 1050 3800
F 0 "R3" V 1130 3800 40  0000 C CNN
F 1 "4.7k" V 1057 3801 40  0000 C CNN
F 2 "SM0603" V 980 3800 30  0000 C CNN
F 3 "~" H 1050 3800 30  0000 C CNN
	1    1050 3800
	-1   0    0    1   
$EndComp
$Comp
L R R4
U 1 1 5562D7EE
P 1150 3800
F 0 "R4" V 1230 3800 40  0000 C CNN
F 1 "4.7k" V 1157 3801 40  0000 C CNN
F 2 "SM0603" V 1080 3800 30  0000 C CNN
F 3 "~" H 1150 3800 30  0000 C CNN
	1    1150 3800
	-1   0    0    1   
$EndComp
Wire Wire Line
	1150 3550 1150 3450
Wire Wire Line
	1050 3450 1050 3550
$Comp
L GND #PWR014
U 1 1 5562D929
P 1100 4100
F 0 "#PWR014" H 1100 4100 30  0001 C CNN
F 1 "GND" H 1100 4030 30  0001 C CNN
F 2 "" H 1100 4100 60  0000 C CNN
F 3 "" H 1100 4100 60  0000 C CNN
	1    1100 4100
	1    0    0    -1  
$EndComp
Wire Wire Line
	1100 4100 1100 4050
Wire Wire Line
	1050 4050 1150 4050
Connection ~ 1100 4050
$Comp
L R R?
U 1 1 55726C02
P 8850 2350
F 0 "R?" V 8930 2350 40  0000 C CNN
F 1 "4.7k" V 8857 2351 40  0000 C CNN
F 2 "SM0603" V 8780 2350 30  0000 C CNN
F 3 "~" H 8850 2350 30  0000 C CNN
	1    8850 2350
	0    1    1    0   
$EndComp
$Comp
L R R?
U 1 1 55726C08
P 8850 1900
F 0 "R?" V 8930 1900 40  0000 C CNN
F 1 "4.7k" V 8857 1901 40  0000 C CNN
F 2 "SM0603" V 8780 1900 30  0000 C CNN
F 3 "~" H 8850 1900 30  0000 C CNN
	1    8850 1900
	0    1    1    0   
$EndComp
Wire Wire Line
	9100 1900 9150 1900
Wire Wire Line
	8600 1900 8400 1900
Wire Wire Line
	8250 2350 8600 2350
Wire Wire Line
	9100 2350 9150 2350
$EndSCHEMATC