plasma_source.sch

EESchema Schematic File Version 2
LIBS:db9_shield
LIBS:74hct04
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:doors
LIBS:thc-cache
EELAYER 27 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 3 3
Title "Torch height controller board"
Date "2 mar 2014"
Rev "2"
Comp ""
Comment1 "License: GPL v3"
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L ISOL_PWR U8
U 1 1 52EEA3A5
P 8950 1550
F 0 "U8" H 9150 1250 60  0000 C CNN
F 1 "MCE12S12D" H 9000 1700 60  0000 C CNN
F 2 "~" H 8950 1550 60  0000 C CNN
F 3 "~" H 8950 1550 60  0000 C CNN
	1    8950 1550
	1    0    0    -1  
$EndComp
$Comp
L +12V #PWR41
U 1 1 52EEA3C5
P 5600 1850
F 0 "#PWR41" H 5600 1800 20  0001 C CNN
F 1 "+12V" H 5600 1950 30  0000 C CNN
F 2 "" H 5600 1850 60  0000 C CNN
F 3 "" H 5600 1850 60  0000 C CNN
	1    5600 1850
	1    0    0    -1  
$EndComp
Wire Wire Line
	8200 1550 8350 1550
Wire Wire Line
	8200 1150 8200 1550
Wire Wire Line
	8350 1700 8200 1700
Wire Wire Line
	8200 1700 8200 1950
$Comp
L GND #PWR44
U 1 1 52EEA3D9
P 8400 1200
F 0 "#PWR44" H 8400 1200 30  0001 C CNN
F 1 "GND" H 8400 1130 30  0001 C CNN
F 2 "" H 8400 1200 60  0000 C CNN
F 3 "" H 8400 1200 60  0000 C CNN
	1    8400 1200
	1    0    0    -1  
$EndComp
$Comp
L VSS #PWR49
U 1 1 52EEA3E8
P 9750 1250
F 0 "#PWR49" H 9750 1250 30  0001 C CNN
F 1 "VSS" H 9750 1180 30  0000 C CNN
F 2 "" H 9750 1250 60  0000 C CNN
F 3 "" H 9750 1250 60  0000 C CNN
	1    9750 1250
	1    0    0    -1  
$EndComp
Wire Wire Line
	9600 1700 9600 2050
$Comp
L +12C #PWR46
U 1 1 52EEA406
P 9350 2050
F 0 "#PWR46" H 9350 2020 30  0001 C CNN
F 1 "+12C" H 9350 2160 40  0000 C CNN
F 2 "" H 9350 2050 60  0000 C CNN
F 3 "" H 9350 2050 60  0000 C CNN
	1    9350 2050
	1    0    0    -1  
$EndComp
Wire Wire Line
	9600 1150 9600 1550
$Comp
L C C11
U 1 1 52EEA41B
P 9900 1600
F 0 "C11" H 9900 1700 40  0000 L CNN
F 1 "0.1uF" H 9906 1515 40  0000 L CNN
F 2 "~" H 9938 1450 30  0000 C CNN
F 3 "~" H 9900 1600 60  0000 C CNN
	1    9900 1600
	1    0    0    -1  
$EndComp
Wire Wire Line
	9600 1400 10200 1400
Connection ~ 9600 1400
Wire Wire Line
	9600 1800 10200 1800
Connection ~ 9600 1800
$Comp
L CP C12
U 1 1 52EEA446
P 10200 1600
F 0 "C12" H 10250 1700 40  0000 L CNN
F 1 "10uF" H 10250 1500 40  0000 L CNN
F 2 "~" H 10300 1450 30  0000 C CNN
F 3 "~" H 10200 1600 300 0000 C CNN
	1    10200 1600
	1    0    0    -1  
$EndComp
Wire Wire Line
	9900 1400 9850 1400
Connection ~ 9900 1800
$Comp
L C C10
U 1 1 52EEA483
P 8000 1550
F 0 "C10" H 8000 1650 40  0000 L CNN
F 1 "0.1uF" H 8006 1465 40  0000 L CNN
F 2 "~" H 8038 1400 30  0000 C CNN
F 3 "~" H 8000 1550 60  0000 C CNN
	1    8000 1550
	1    0    0    -1  
$EndComp
$Comp
L CP C9
U 1 1 52EEA489
P 7650 1550
F 0 "C9" H 7700 1650 40  0000 L CNN
F 1 "10uF" H 7700 1450 40  0000 L CNN
F 2 "~" H 7750 1400 30  0000 C CNN
F 3 "~" H 7650 1550 300 0000 C CNN
	1    7650 1550
	1    0    0    -1  
$EndComp
Wire Wire Line
	7650 1350 8200 1350
Connection ~ 8200 1350
Connection ~ 8000 1350
Wire Wire Line
	7650 1750 8200 1750
Connection ~ 8200 1750
Connection ~ 8000 1750
$Comp
L IL300 PH1
U 1 1 52EEA4CE
P 4100 2400
F 0 "PH1" H 4100 2750 50  0000 C CNN
F 1 "IL300" H 4100 2055 50  0000 C CNN
F 2 "~" H 4100 2400 60  0000 C CNN
F 3 "~" H 4100 2400 60  0000 C CNN
	1    4100 2400
	1    0    0    -1  
$EndComp
Wire Wire Line
	800  1950 1850 1950
Text Label 900  1950 0    60   ~ 0
ANALOG_IN
$Comp
L LM358 U1
U 1 1 52EEA505
P 2350 2050
F 0 "U1" H 2300 2250 60  0000 L CNN
F 1 "LM358" H 2300 1800 60  0000 L CNN
F 2 "" H 2350 2050 60  0000 C CNN
F 3 "" H 2350 2050 60  0000 C CNN
	1    2350 2050
	1    0    0    -1  
$EndComp
$Comp
L VSS #PWR28
U 1 1 52EEA526
P 2250 3350
F 0 "#PWR28" H 2250 3350 30  0001 C CNN
F 1 "VSS" H 2250 3280 30  0000 C CNN
F 2 "" H 2250 3350 60  0000 C CNN
F 3 "" H 2250 3350 60  0000 C CNN
	1    2250 3350
	1    0    0    -1  
$EndComp
$Comp
L R R22
U 1 1 52EEA52E
P 1550 2400
F 0 "R22" V 1630 2400 40  0000 C CNN
F 1 "47k" V 1557 2401 40  0000 C CNN
F 2 "~" V 1480 2400 30  0000 C CNN
F 3 "~" H 1550 2400 30  0000 C CNN
	1    1550 2400
	1    0    0    -1  
$EndComp
Wire Wire Line
	1550 2150 1850 2150
Wire Wire Line
	1550 2650 2250 2650
Wire Wire Line
	2250 2450 2250 3350
Connection ~ 2250 2650
Wire Wire Line
	1750 2500 1750 2150
Connection ~ 1750 2150
$Comp
L +12C #PWR27
U 1 1 52EEA5D9
P 2250 1500
F 0 "#PWR27" H 2250 1470 30  0001 C CNN
F 1 "+12C" H 2250 1610 40  0000 C CNN
F 2 "" H 2250 1500 60  0000 C CNN
F 3 "" H 2250 1500 60  0000 C CNN
	1    2250 1500
	1    0    0    -1  
$EndComp
Wire Wire Line
	2250 1500 2250 1650
$Comp
L VSS #PWR34
U 1 1 52EEA5FA
P 3600 2950
F 0 "#PWR34" H 3600 2950 30  0001 C CNN
F 1 "VSS" H 3600 2880 30  0000 C CNN
F 2 "" H 3600 2950 60  0000 C CNN
F 3 "" H 3600 2950 60  0000 C CNN
	1    3600 2950
	1    0    0    -1  
$EndComp
Wire Wire Line
	3750 2300 3600 2300
Wire Wire Line
	3600 2300 3600 2950
$Comp
L +12C #PWR31
U 1 1 52EEA628
P 2900 1650
F 0 "#PWR31" H 2900 1620 30  0001 C CNN
F 1 "+12C" H 2900 1760 40  0000 C CNN
F 2 "" H 2900 1650 60  0000 C CNN
F 3 "" H 2900 1650 60  0000 C CNN
	1    2900 1650
	1    0    0    -1  
$EndComp
$Comp
L R R26
U 1 1 52EEA62E
P 3250 2050
F 0 "R26" V 3330 2050 40  0000 C CNN
F 1 "400R" V 3257 2051 40  0000 C CNN
F 2 "~" V 3180 2050 30  0000 C CNN
F 3 "~" H 3250 2050 30  0000 C CNN
	1    3250 2050
	0    -1   -1   0   
$EndComp
Wire Wire Line
	2850 2050 3000 2050
Wire Wire Line
	3500 2050 3500 2150
Wire Wire Line
	3500 2150 3750 2150
Wire Wire Line
	3750 2650 2500 2650
Wire Wire Line
	2500 2650 2500 2500
Wire Wire Line
	2500 2500 1750 2500
Wire Wire Line
	2900 1650 2900 2500
Wire Wire Line
	2900 2500 3750 2500
$Comp
L +5V #PWR37
U 1 1 52EEA737
P 4550 2000
F 0 "#PWR37" H 4550 2090 20  0001 C CNN
F 1 "+5V" H 4550 2090 30  0000 C CNN
F 2 "" H 4550 2000 60  0000 C CNN
F 3 "" H 4550 2000 60  0000 C CNN
	1    4550 2000
	1    0    0    -1  
$EndComp
Wire Wire Line
	4550 2000 4550 2250
Wire Wire Line
	4550 2250 4450 2250
$Comp
L GND #PWR40
U 1 1 52EEA76F
P 4800 3150
F 0 "#PWR40" H 4800 3150 30  0001 C CNN
F 1 "GND" H 4800 3080 30  0001 C CNN
F 2 "" H 4800 3150 60  0000 C CNN
F 3 "" H 4800 3150 60  0000 C CNN
	1    4800 3150
	1    0    0    -1  
$EndComp
Wire Wire Line
	4800 2900 4800 3150
Wire Wire Line
	4450 2550 4800 2550
$Comp
L LM358 U9
U 1 1 52EEA7C4
P 5700 2350
F 0 "U9" H 5650 2550 60  0000 L CNN
F 1 "LM358" H 5650 2100 60  0000 L CNN
F 2 "" H 5700 2350 60  0000 C CNN
F 3 "" H 5700 2350 60  0000 C CNN
	1    5700 2350
	1    0    0    -1  
$EndComp
Wire Wire Line
	4800 2550 4800 2250
Wire Wire Line
	4800 2250 5200 2250
Wire Wire Line
	5200 2450 5100 2450
Wire Wire Line
	5100 2450 5100 2950
Wire Wire Line
	5100 2950 6200 2950
Wire Wire Line
	6200 2950 6200 2350
Wire Wire Line
	6200 2350 6600 2350
$Comp
L GND #PWR42
U 1 1 52EEA853
P 5600 3150
F 0 "#PWR42" H 5600 3150 30  0001 C CNN
F 1 "GND" H 5600 3080 30  0001 C CNN
F 2 "" H 5600 3150 60  0000 C CNN
F 3 "" H 5600 3150 60  0000 C CNN
	1    5600 3150
	1    0    0    -1  
$EndComp
Wire Wire Line
	5600 2750 5600 3150
Wire Wire Line
	5600 1850 5600 1950
$Comp
L C C8
U 1 1 52EEA8C2
P 6400 2850
F 0 "C8" H 6400 2950 40  0000 L CNN
F 1 "0.1uF" H 6406 2765 40  0000 L CNN
F 2 "~" H 6438 2700 30  0000 C CNN
F 3 "~" H 6400 2850 60  0000 C CNN
	1    6400 2850
	1    0    0    -1  
$EndComp
Wire Wire Line
	5600 3050 6400 3050
Connection ~ 5600 3050
Wire Wire Line
	6400 2650 6400 2600
$Comp
L C C1
U 1 1 52EEA936
P 2850 3050
F 0 "C1" H 2850 3150 40  0000 L CNN
F 1 "0.1uF" H 2856 2965 40  0000 L CNN
F 2 "~" H 2888 2900 30  0000 C CNN
F 3 "~" H 2850 3050 60  0000 C CNN
	1    2850 3050
	1    0    0    -1  
$EndComp
Wire Wire Line
	1200 3250 2850 3250
Connection ~ 2250 3250
$Comp
L +12C #PWR30
U 1 1 52EEA992
P 2850 2800
F 0 "#PWR30" H 2850 2770 30  0001 C CNN
F 1 "+12C" H 2850 2910 40  0000 C CNN
F 2 "" H 2850 2800 60  0000 C CNN
F 3 "" H 2850 2800 60  0000 C CNN
	1    2850 2800
	1    0    0    -1  
$EndComp
Wire Wire Line
	2850 2800 2850 2850
$Comp
L 4N25 IC2
U 1 1 52EEA9D2
P 3750 4850
F 0 "IC2" H 3536 5029 40  0000 C CNN
F 1 "4N25" H 3930 4665 40  0000 C CNN
F 2 "DIP6" H 3551 4670 29  0000 C CNN
F 3 "~" H 3750 4850 60  0000 C CNN
	1    3750 4850
	1    0    0    -1  
$EndComp
$Comp
L R R24
U 1 1 52EEA9E9
P 2700 4750
F 0 "R24" V 2780 4750 40  0000 C CNN
F 1 "400R" V 2707 4751 40  0000 C CNN
F 2 "~" V 2630 4750 30  0000 C CNN
F 3 "~" H 2700 4750 30  0000 C CNN
	1    2700 4750
	0    1    1    0   
$EndComp
Wire Wire Line
	2950 4750 3400 4750
Wire Wire Line
	3400 4950 3250 4950
Wire Wire Line
	3250 4950 3250 5200
$Comp
L VSS #PWR32
U 1 1 52EEAA9D
P 3250 5200
F 0 "#PWR32" H 3250 5200 30  0001 C CNN
F 1 "VSS" H 3250 5130 30  0000 C CNN
F 2 "" H 3250 5200 60  0000 C CNN
F 3 "" H 3250 5200 60  0000 C CNN
	1    3250 5200
	1    0    0    -1  
$EndComp
NoConn ~ 4100 4750
$Comp
L R R27
U 1 1 52EEAADF
P 4400 4550
F 0 "R27" V 4480 4550 40  0000 C CNN
F 1 "1K" V 4407 4551 40  0000 C CNN
F 2 "~" V 4330 4550 30  0000 C CNN
F 3 "~" H 4400 4550 30  0000 C CNN
	1    4400 4550
	-1   0    0    1   
$EndComp
Wire Wire Line
	4400 4800 4400 4850
Wire Wire Line
	4100 4850 5000 4850
$Comp
L +5V #PWR36
U 1 1 52EEAB27
P 4400 4250
F 0 "#PWR36" H 4400 4340 20  0001 C CNN
F 1 "+5V" H 4400 4340 30  0000 C CNN
F 2 "" H 4400 4250 60  0000 C CNN
F 3 "" H 4400 4250 60  0000 C CNN
	1    4400 4250
	1    0    0    -1  
$EndComp
Wire Wire Line
	4400 4250 4400 4300
Wire Wire Line
	4100 4950 4250 4950
Wire Wire Line
	4250 4950 4250 5200
$Comp
L GND #PWR35
U 1 1 52EEABF3
P 4250 5200
F 0 "#PWR35" H 4250 5200 30  0001 C CNN
F 1 "GND" H 4250 5130 30  0001 C CNN
F 2 "" H 4250 5200 60  0000 C CNN
F 3 "" H 4250 5200 60  0000 C CNN
	1    4250 5200
	1    0    0    -1  
$EndComp
Connection ~ 4400 4850
Wire Wire Line
	1700 4750 2450 4750
Text Label 1700 4750 0    60   ~ 0
ARC_OK
$Comp
L 4N25 IC3
U 1 1 52EEAD07
P 3750 6600
F 0 "IC3" H 3536 6779 40  0000 C CNN
F 1 "4N25" H 3930 6415 40  0000 C CNN
F 2 "DIP6" H 3551 6420 29  0000 C CNN
F 3 "~" H 3750 6600 60  0000 C CNN
	1    3750 6600
	1    0    0    -1  
$EndComp
$Comp
L R R25
U 1 1 52EEAD0D
P 3100 6500
F 0 "R25" V 3180 6500 40  0000 C CNN
F 1 "100R" V 3107 6501 40  0000 C CNN
F 2 "~" V 3030 6500 30  0000 C CNN
F 3 "~" H 3100 6500 30  0000 C CNN
	1    3100 6500
	0    1    1    0   
$EndComp
$Comp
L BC547 Q1
U 1 1 52EEAD15
P 2500 6300
F 0 "Q1" H 2500 6151 40  0000 R CNN
F 1 "BC547" H 2500 6450 40  0000 R CNN
F 2 "TO92" H 2400 6402 29  0000 C CNN
F 3 "~" H 2500 6300 60  0000 C CNN
	1    2500 6300
	1    0    0    -1  
$EndComp
Wire Wire Line
	2600 6500 2850 6500
Wire Wire Line
	3350 6500 3400 6500
Wire Wire Line
	3400 6700 3400 6900
$Comp
L GND #PWR33
U 1 1 52EEAE17
P 3400 6900
F 0 "#PWR33" H 3400 6900 30  0001 C CNN
F 1 "GND" H 3400 6830 30  0001 C CNN
F 2 "" H 3400 6900 60  0000 C CNN
F 3 "" H 3400 6900 60  0000 C CNN
	1    3400 6900
	1    0    0    -1  
$EndComp
$Comp
L +5V #PWR29
U 1 1 52EEAE63
P 2600 5700
F 0 "#PWR29" H 2600 5790 20  0001 C CNN
F 1 "+5V" H 2600 5790 30  0000 C CNN
F 2 "" H 2600 5700 60  0000 C CNN
F 3 "" H 2600 5700 60  0000 C CNN
	1    2600 5700
	1    0    0    -1  
$EndComp
Wire Wire Line
	2600 5700 2600 6100
$Comp
L R R23
U 1 1 52EEAEAF
P 1900 6050
F 0 "R23" V 1980 6050 40  0000 C CNN
F 1 "10K" V 1907 6051 40  0000 C CNN
F 2 "~" V 1830 6050 30  0000 C CNN
F 3 "~" H 1900 6050 30  0000 C CNN
	1    1900 6050
	-1   0    0    1   
$EndComp
Wire Wire Line
	1750 6300 2300 6300
$Comp
L R R21
U 1 1 52EEAF9F
P 1500 6300
F 0 "R21" V 1580 6300 40  0000 C CNN
F 1 "3K3" V 1507 6301 40  0000 C CNN
F 2 "~" V 1430 6300 30  0000 C CNN
F 3 "~" H 1500 6300 30  0000 C CNN
	1    1500 6300
	0    1    1    0   
$EndComp
Connection ~ 1900 6300
Wire Wire Line
	4100 6700 4550 6700
Wire Wire Line
	4100 6600 5300 6600
$Comp
L +12C #PWR38
U 1 1 52EEB189
P 4550 5850
F 0 "#PWR38" H 4550 5820 30  0001 C CNN
F 1 "+12C" H 4550 5960 40  0000 C CNN
F 2 "" H 4550 5850 60  0000 C CNN
F 3 "" H 4550 5850 60  0000 C CNN
	1    4550 5850
	1    0    0    -1  
$EndComp
Wire Wire Line
	4550 6700 4550 7250
$Comp
L VSS #PWR39
U 1 1 52EEB231
P 4550 7250
F 0 "#PWR39" H 4550 7250 30  0001 C CNN
F 1 "VSS" H 4550 7180 30  0000 C CNN
F 2 "" H 4550 7250 60  0000 C CNN
F 3 "" H 4550 7250 60  0000 C CNN
	1    4550 7250
	1    0    0    -1  
$EndComp
$Comp
L R R28
U 1 1 52EEB237
P 4550 6350
F 0 "R28" V 4630 6350 40  0000 C CNN
F 1 "1K" V 4557 6351 40  0000 C CNN
F 2 "~" V 4480 6350 30  0000 C CNN
F 3 "~" H 4550 6350 30  0000 C CNN
	1    4550 6350
	-1   0    0    1   
$EndComp
Wire Wire Line
	4550 5850 4550 6100
$Comp
L DB9 J3
U 1 1 52EEB657
P 8350 4100
F 0 "J3" H 8350 4650 70  0000 C CNN
F 1 "DB9" H 8350 3550 70  0000 C CNN
F 2 "~" H 8350 4100 60  0000 C CNN
F 3 "~" H 8350 4100 60  0000 C CNN
	1    8350 4100
	-1   0    0    1   
$EndComp
Wire Wire Line
	8800 4100 9300 4100
Text Label 8850 4100 0    60   ~ 0
ANALOG_IN
Text Label 8850 3700 0    60   ~ 0
TORCH_ON
Text Label 8850 4200 0    60   ~ 0
ARC_OK
Wire Wire Line
	9450 3900 8800 3900
Wire Wire Line
	9450 3300 9450 5150
Wire Wire Line
	8800 4000 9600 4000
Wire Wire Line
	9600 4000 9600 3200
Wire Wire Line
	8800 3700 9300 3700
Wire Wire Line
	8800 4200 9300 4200
Connection ~ 4550 6600
Text Label 5300 6600 2    60   ~ 0
TORCH_ON
$Comp
L +12C #PWR48
U 1 1 52EEB6E6
P 9600 3200
F 0 "#PWR48" H 9600 3170 30  0001 C CNN
F 1 "+12C" H 9600 3310 40  0000 C CNN
F 2 "" H 9600 3200 60  0000 C CNN
F 3 "" H 9600 3200 60  0000 C CNN
	1    9600 3200
	1    0    0    -1  
$EndComp
Wire Wire Line
	8800 3800 9450 3800
Connection ~ 9450 3900
Wire Wire Line
	8800 4300 9450 4300
Connection ~ 9450 4300
Wire Wire Line
	8800 4400 9450 4400
Connection ~ 9450 4400
Wire Wire Line
	8800 4500 9450 4500
Connection ~ 9450 4500
$Comp
L VSS #PWR47
U 1 1 52EEB915
P 9450 5150
F 0 "#PWR47" H 9450 5150 30  0001 C CNN
F 1 "VSS" H 9450 5080 30  0000 C CNN
F 2 "" H 9450 5150 60  0000 C CNN
F 3 "" H 9450 5150 60  0000 C CNN
	1    9450 5150
	1    0    0    -1  
$EndComp
Wire Wire Line
	8450 3300 9450 3300
Connection ~ 9450 3800
Text GLabel 6600 2350 2    60   Input ~ 0
I_ANALOG_IN
Text GLabel 5000 4850 2    60   Input ~ 0
I_ARC_OK
Text GLabel 1250 6300 0    60   Input ~ 0
I_TORCH_ON
Wire Notes Line
	650  4400 2050 4400
Wire Notes Line
	2050 5350 650  5350
Wire Notes Line
	650  5350 650  4400
Text Notes 700  5200 0    60   ~ 0
12V signal commutated by a \nrelay inside plasma source
Connection ~ 10200 1400
Connection ~ 10200 1800
Connection ~ 9850 1400
Connection ~ 9900 1400
$Comp
L +12V #PWR43
U 1 1 52FA23DF
P 6400 2600
F 0 "#PWR43" H 6400 2550 20  0001 C CNN
F 1 "+12V" H 6400 2700 30  0000 C CNN
F 2 "" H 6400 2600 60  0000 C CNN
F 3 "" H 6400 2600 60  0000 C CNN
	1    6400 2600
	1    0    0    -1  
$EndComp
$Comp
L +12V #PWR45
U 1 1 52FDDDA7
P 8400 1900
F 0 "#PWR45" H 8400 1850 20  0001 C CNN
F 1 "+12V" H 8400 2000 30  0000 C CNN
F 2 "" H 8400 1900 60  0000 C CNN
F 3 "" H 8400 1900 60  0000 C CNN
	1    8400 1900
	1    0    0    -1  
$EndComp
Wire Wire Line
	8400 1900 8400 1950
Wire Wire Line
	8400 1950 8200 1950
Wire Wire Line
	8400 1200 8400 1150
Wire Wire Line
	8400 1150 8200 1150
Wire Wire Line
	9750 1250 9750 1150
Wire Wire Line
	9750 1150 9600 1150
Wire Wire Line
	9600 2050 9350 2050
$Comp
L ZENER D1
U 1 1 530289CF
P 1200 2150
F 0 "D1" H 1200 2250 50  0000 C CNN
F 1 "5v1 ZENER" H 1200 2050 40  0000 C CNN
F 2 "~" H 1200 2150 60  0000 C CNN
F 3 "~" H 1200 2150 60  0000 C CNN
	1    1200 2150
	0    -1   -1   0   
$EndComp
Wire Wire Line
	1200 3250 1200 2350
$Comp
L ZENER D11
U 1 1 53028A51
P 2250 4950
F 0 "D11" H 2250 5050 50  0000 C CNN
F 1 "12v1 ZENER" H 2250 4850 40  0000 C CNN
F 2 "~" H 2250 4950 60  0000 C CNN
F 3 "~" H 2250 4950 60  0000 C CNN
	1    2250 4950
	0    -1   -1   0   
$EndComp
Wire Wire Line
	2250 5150 3250 5150
Connection ~ 3250 5150
$Comp
L ZENER D12
U 1 1 53028AD8
P 4900 6800
F 0 "D12" H 4900 6900 50  0000 C CNN
F 1 "12v1 ZENER" H 4900 6700 40  0000 C CNN
F 2 "~" H 4900 6800 60  0000 C CNN
F 3 "~" H 4900 6800 60  0000 C CNN
	1    4900 6800
	0    -1   -1   0   
$EndComp
Wire Wire Line
	4550 7000 4900 7000
Connection ~ 4550 7000
Connection ~ 1200 1950
Connection ~ 2250 4750
Connection ~ 4900 6600
Wire Wire Line
	1900 5800 2600 5800
Connection ~ 2600 5800
$Comp
L POT RV1
U 1 1 53136847
P 4550 2900
F 0 "RV1" H 4550 2800 50  0000 C CNN
F 1 "50K" H 4550 2900 50  0000 C CNN
F 2 "~" H 4550 2900 60  0000 C CNN
F 3 "~" H 4550 2900 60  0000 C CNN
	1    4550 2900
	1    0    0    -1  
$EndComp
Wire Wire Line
	4550 2750 4550 2550
Connection ~ 4550 2550
NoConn ~ 4300 2900
Wire Notes Line
	600  750  7450 750 
Wire Notes Line
	7450 750  7450 3900
Wire Notes Line
	7450 3900 600  3900
Wire Notes Line
	600  3900 600  750 
Text Notes 3600 1000 0    60   ~ 0
Opto-isolated measurement of analog input signal from plasma source.\nGain is set by R22 : RV1.\n\nNB! The values below are for earlier version of sensor board \n(whose output signal range was 5V).\nRV1 should be about 20-30K for latest version of sensor board\n(whose output signal range is 0-10V). \nD1 should also be changed to 10/12V part.
Wire Notes Line
	7550 750  7550 2900
Wire Notes Line
	7550 2900 10900 2900
Wire Notes Line
	10900 2900 10900 750 
Wire Notes Line
	10900 750  7550 750 
Text Notes 7650 2700 0    60   ~ 0
Isolated power supply for plasma source side. \n1W rated one seems to be sufficient, but the current is near limit.
Wire Notes Line
	2050 4400 2050 5350
$EndSCHEMATC