EESchema Schematic File Version 4 EELAYER 30 0 EELAYER END $Descr A4 11693 8268 encoding utf-8 Sheet 3 4 Title "" Date "" Rev "" Comp "" Comment1 "" Comment2 "" Comment3 "" Comment4 "" $EndDescr $Comp L Timer:ICM7556 U? U 1 1 5FFB665B P 5500 3850 F 0 "U?" H 5650 4300 50 0000 C CNN F 1 "ICM7556" H 5750 4200 50 0000 C CNN F 2 "" H 5500 3850 50 0001 C CNN F 3 "http://www.intersil.com/content/dam/Intersil/documents/icm7/icm7555-56.pdf" H 5500 3850 50 0001 C CNN 1 5500 3850 1 0 0 -1 $EndComp $Comp L Device:R R? U 1 1 5FFB8488 P 1700 3250 F 0 "R?" V 1600 3150 50 0000 L CNN F 1 "10k" V 1800 3150 50 0000 L CNN F 2 "" V 1630 3250 50 0001 C CNN F 3 "~" H 1700 3250 50 0001 C CNN 1 1700 3250 0 1 1 0 $EndComp $Comp L Device:C C? U 1 1 5FFB88E5 P 3500 3850 F 0 "C?" V 3350 3800 50 0000 L CNN F 1 "10n" V 3650 3800 50 0000 L CNN F 2 "" H 3538 3700 50 0001 C CNN F 3 "~" H 3500 3850 50 0001 C CNN 1 3500 3850 0 1 1 0 $EndComp $Comp L power:+12V #PWR? U 1 1 5FF1DD4D P 1950 2950 F 0 "#PWR?" H 1950 2800 50 0001 C CNN F 1 "+12V" H 1965 3123 50 0000 C CNN F 2 "" H 1950 2950 50 0001 C CNN F 3 "" H 1950 2950 50 0001 C CNN 1 1950 2950 1 0 0 -1 $EndComp $Comp L power:-12V #PWR? U 1 1 5FF1E38D P 1900 5650 F 0 "#PWR?" H 1900 5750 50 0001 C CNN F 1 "-12V" H 1915 5823 50 0000 C CNN F 2 "" H 1900 5650 50 0001 C CNN F 3 "" H 1900 5650 50 0001 C CNN 1 1900 5650 -1 0 0 1 $EndComp $Comp L power:GND #PWR? U 1 1 5FF1E961 P 5500 4350 F 0 "#PWR?" H 5500 4100 50 0001 C CNN F 1 "GND" H 5505 4177 50 0000 C CNN F 2 "" H 5500 4350 50 0001 C CNN F 3 "" H 5500 4350 50 0001 C CNN 1 5500 4350 1 0 0 -1 $EndComp $Comp L Device:R R? U 1 1 5FF1FFAB P 1700 3550 F 0 "R?" V 1600 3450 50 0000 L CNN F 1 "47k" V 1800 3450 50 0000 L CNN F 2 "" V 1630 3550 50 0001 C CNN F 3 "~" H 1700 3550 50 0001 C CNN 1 1700 3550 0 1 1 0 $EndComp $Comp L Device:R R? U 1 1 5FF20993 P 1850 3900 F 0 "R?" V 1750 3800 50 0000 L CNN F 1 "1M" V 1950 3800 50 0000 L CNN F 2 "" V 1780 3900 50 0001 C CNN F 3 "~" H 1850 3900 50 0001 C CNN 1 1850 3900 0 1 1 0 $EndComp $Comp L Device:R R? U 1 1 5FF20D76 P 1450 4200 F 0 "R?" V 1550 4200 50 0000 L CNN F 1 "1.2M" V 1350 4100 50 0000 L CNN F 2 "" V 1380 4200 50 0001 C CNN F 3 "~" H 1450 4200 50 0001 C CNN 1 1450 4200 -1 0 0 1 $EndComp $Comp L Diode:1N4148WS D? U 1 1 5FF2192D P 2150 4150 F 0 "D?" H 2150 4050 50 0000 L CNN F 1 "1N4148WS" H 1950 4250 50 0000 L CNN F 2 "Diode_SMD:D_SOD-323" H 2150 3975 50 0001 C CNN F 3 "https://www.vishay.com/docs/85751/1n4148ws.pdf" H 2150 4150 50 0001 C CNN 1 2150 4150 0 1 1 0 $EndComp $Comp L Device:R R? U 1 1 5FF238C0 P 2400 3400 F 0 "R?" V 2500 3400 50 0000 L CNN F 1 "22k" V 2300 3350 50 0000 L CNN F 2 "" V 2330 3400 50 0001 C CNN F 3 "~" H 2400 3400 50 0001 C CNN 1 2400 3400 -1 0 0 1 $EndComp $Comp L Device:R R? U 1 1 5FF23D20 P 2950 3400 F 0 "R?" V 3050 3400 50 0000 L CNN F 1 "22k" V 2850 3350 50 0000 L CNN F 2 "" V 2880 3400 50 0001 C CNN F 3 "~" H 2950 3400 50 0001 C CNN 1 2950 3400 -1 0 0 1 $EndComp Text HLabel 1200 3250 0 50 Input ~ 0 SW_IN Text HLabel 1200 3550 0 50 Input ~ 0 SW_IN_RET Text HLabel 1200 3900 0 50 Input ~ 0 GATE_IN Wire Wire Line 1850 3250 1950 3250 Wire Wire Line 1950 3250 1950 2950 Wire Wire Line 1200 3550 1550 3550 Wire Wire Line 1200 3250 1550 3250 Wire Wire Line 1200 3900 1450 3900 Wire Wire Line 1450 3900 1450 4050 Wire Wire Line 1700 3900 1450 3900 Connection ~ 1450 3900 Wire Wire Line 1850 3550 2100 3550 Wire Wire Line 2100 3550 2100 3900 Wire Wire Line 2100 3900 2000 3900 Wire Wire Line 2100 3900 2150 3900 Wire Wire Line 2150 3900 2150 4000 Connection ~ 2100 3900 $Comp L Device:R R? U 1 1 5FF2869C P 2700 4450 F 0 "R?" V 2800 4450 50 0000 L CNN F 1 "10R" V 2600 4400 50 0000 L CNN F 2 "" V 2630 4450 50 0001 C CNN F 3 "~" H 2700 4450 50 0001 C CNN 1 2700 4450 -1 0 0 1 $EndComp $Comp L power:GND #PWR? U 1 1 5FF28FC7 P 1450 4450 F 0 "#PWR?" H 1450 4200 50 0001 C CNN F 1 "GND" H 1455 4277 50 0000 C CNN F 2 "" H 1450 4450 50 0001 C CNN F 3 "" H 1450 4450 50 0001 C CNN 1 1450 4450 1 0 0 -1 $EndComp $Comp L power:GND #PWR? U 1 1 5FF29880 P 2150 4450 F 0 "#PWR?" H 2150 4200 50 0001 C CNN F 1 "GND" H 2155 4277 50 0000 C CNN F 2 "" H 2150 4450 50 0001 C CNN F 3 "" H 2150 4450 50 0001 C CNN 1 2150 4450 1 0 0 -1 $EndComp Wire Wire Line 1450 4450 1450 4350 Wire Wire Line 2150 4450 2150 4300 $Comp L power:GND #PWR? U 1 1 5FF2A52F P 2700 4700 F 0 "#PWR?" H 2700 4450 50 0001 C CNN F 1 "GND" H 2705 4527 50 0000 C CNN F 2 "" H 2700 4700 50 0001 C CNN F 3 "" H 2700 4700 50 0001 C CNN 1 2700 4700 1 0 0 -1 $EndComp Wire Wire Line 2700 4700 2700 4600 $Comp L power:+12V #PWR? U 1 1 5FF2EAC4 P 2400 2950 F 0 "#PWR?" H 2400 2800 50 0001 C CNN F 1 "+12V" H 2415 3123 50 0000 C CNN F 2 "" H 2400 2950 50 0001 C CNN F 3 "" H 2400 2950 50 0001 C CNN 1 2400 2950 1 0 0 -1 $EndComp $Comp L power:+12V #PWR? U 1 1 5FF2F0A9 P 2950 2950 F 0 "#PWR?" H 2950 2800 50 0001 C CNN F 1 "+12V" H 2965 3123 50 0000 C CNN F 2 "" H 2950 2950 50 0001 C CNN F 3 "" H 2950 2950 50 0001 C CNN 1 2950 2950 1 0 0 -1 $EndComp Wire Wire Line 2400 3250 2400 2950 Wire Wire Line 2950 3250 2950 2950 $Comp L Device:R R? U 1 1 5FF2FC8E P 3850 4200 F 0 "R?" V 3950 4200 50 0000 L CNN F 1 "22k" V 3750 4150 50 0000 L CNN F 2 "" V 3780 4200 50 0001 C CNN F 3 "~" H 3850 4200 50 0001 C CNN 1 3850 4200 -1 0 0 1 $EndComp Wire Wire Line 3650 3850 3850 3850 Wire Wire Line 3850 3850 3850 4050 $Comp L power:GND #PWR? U 1 1 5FF304DF P 3850 4700 F 0 "#PWR?" H 3850 4450 50 0001 C CNN F 1 "GND" H 3855 4527 50 0000 C CNN F 2 "" H 3850 4700 50 0001 C CNN F 3 "" H 3850 4700 50 0001 C CNN 1 3850 4700 1 0 0 -1 $EndComp Wire Wire Line 3850 4350 3850 4700 $Comp L power:GND #PWR? U 1 1 5FF311D4 P 4250 4700 F 0 "#PWR?" H 4250 4450 50 0001 C CNN F 1 "GND" H 4255 4527 50 0000 C CNN F 2 "" H 4250 4700 50 0001 C CNN F 3 "" H 4250 4700 50 0001 C CNN 1 4250 4700 1 0 0 -1 $EndComp $Comp L Device:R R? U 1 1 5FF3155F P 4250 3400 F 0 "R?" V 4350 3400 50 0000 L CNN F 1 "22k" V 4150 3350 50 0000 L CNN F 2 "" V 4180 3400 50 0001 C CNN F 3 "~" H 4250 3400 50 0001 C CNN 1 4250 3400 -1 0 0 1 $EndComp $Comp L power:+12V #PWR? U 1 1 5FF31FFE P 4250 2950 F 0 "#PWR?" H 4250 2800 50 0001 C CNN F 1 "+12V" H 4265 3123 50 0000 C CNN F 2 "" H 4250 2950 50 0001 C CNN F 3 "" H 4250 2950 50 0001 C CNN 1 4250 2950 1 0 0 -1 $EndComp Wire Wire Line 4250 3250 4250 2950 Wire Wire Line 4250 3550 4250 3650 Wire Wire Line 4250 3650 5000 3650 $Comp L Device:C C? U 1 1 5FF37EAD P 4600 4250 F 0 "C?" V 4450 4200 50 0000 L CNN F 1 "10n" V 4750 4200 50 0000 L CNN F 2 "Capacitor_SMD:C_0603_1608Metric" H 4638 4100 50 0001 C CNN F 3 "~" H 4600 4250 50 0001 C CNN 1 4600 4250 -1 0 0 1 $EndComp $Comp L power:GND #PWR? U 1 1 5FF389DB P 4600 4500 F 0 "#PWR?" H 4600 4250 50 0001 C CNN F 1 "GND" H 4605 4327 50 0000 C CNN F 2 "" H 4600 4500 50 0001 C CNN F 3 "" H 4600 4500 50 0001 C CNN 1 4600 4500 1 0 0 -1 $EndComp Wire Wire Line 5500 4350 5500 4250 $Comp L power:+12V #PWR? U 1 1 5FF3A074 P 5500 3350 F 0 "#PWR?" H 5500 3200 50 0001 C CNN F 1 "+12V" H 5515 3523 50 0000 C CNN F 2 "" H 5500 3350 50 0001 C CNN F 3 "" H 5500 3350 50 0001 C CNN 1 5500 3350 1 0 0 -1 $EndComp Wire Wire Line 5500 3350 5500 3450 $Comp L Diode:1N4148WS D? U 1 1 5FF3B739 P 5500 5200 F 0 "D?" H 5500 5100 50 0000 L CNN F 1 "1N4148WS" H 5300 5300 50 0000 L CNN F 2 "Diode_SMD:D_SOD-323" H 5500 5025 50 0001 C CNN F 3 "https://www.vishay.com/docs/85751/1n4148ws.pdf" H 5500 5200 50 0001 C CNN 1 5500 5200 1 0 0 -1 $EndComp Wire Wire Line 4600 4500 4600 4400 Wire Wire Line 4600 4100 4600 3850 Wire Wire Line 4600 3850 5000 3850 Wire Wire Line 5000 4050 4850 4050 Wire Wire Line 4850 4050 4850 5200 Wire Wire Line 4850 5200 5350 5200 Wire Wire Line 4850 5200 3250 5200 Wire Wire Line 3250 5200 3250 3850 Wire Wire Line 3250 3850 3350 3850 Connection ~ 4850 5200 $Comp L Device:R R? U 1 1 5FF3FD3C P 5300 2650 F 0 "R?" V 5400 2650 50 0000 L CNN F 1 "1M" V 5200 2600 50 0000 L CNN F 2 "" V 5230 2650 50 0001 C CNN F 3 "~" H 5300 2650 50 0001 C CNN 1 5300 2650 0 -1 -1 0 $EndComp $Comp L Transistor_FET:BS170F Q? U 1 1 5FF431FA P 6050 2650 F 0 "Q?" H 6255 2696 50 0000 L CNN F 1 "BS170F" H 6255 2605 50 0000 L CNN F 2 "Package_TO_SOT_SMD:SOT-23" H 6250 2575 50 0001 L CIN F 3 "http://www.diodes.com/assets/Datasheets/BS170F.pdf" H 6050 2650 50 0001 L CNN 1 6050 2650 1 0 0 -1 $EndComp Wire Wire Line 6150 3850 6000 3850 Text HLabel 6400 2200 2 50 Input ~ 0 SUS_3 Text HLabel 6400 1950 2 50 Input ~ 0 SUS_1 Text HLabel 7100 2050 0 50 Input ~ 0 SUS_2 $Comp L Device:R R? U 1 1 5FF4EEAC P 6100 1950 F 0 "R?" V 6200 1950 50 0000 L CNN F 1 "4.7k" V 6000 1900 50 0000 L CNN F 2 "" V 6030 1950 50 0001 C CNN F 3 "~" H 6100 1950 50 0001 C CNN 1 6100 1950 0 -1 -1 0 $EndComp $Comp L power:+12V #PWR? U 1 1 5FF4F2B7 P 5700 1850 F 0 "#PWR?" H 5700 1700 50 0001 C CNN F 1 "+12V" H 5715 2023 50 0000 C CNN F 2 "" H 5700 1850 50 0001 C CNN F 3 "" H 5700 1850 50 0001 C CNN 1 5700 1850 1 0 0 -1 $EndComp Wire Wire Line 5700 1850 5700 1950 Wire Wire Line 5700 1950 5950 1950 Wire Wire Line 6250 1950 6400 1950 Wire Wire Line 6150 2200 6150 2450 Wire Wire Line 6150 2200 6400 2200 $Comp L Amplifier_Operational:TL084 U? U 4 1 5FF51953 P 7600 1950 F 0 "U?" H 7600 1583 50 0000 C CNN F 1 "TL084" H 7600 1674 50 0000 C CNN F 2 "" H 7550 2050 50 0001 C CNN F 3 "http://www.ti.com/lit/ds/symlink/tl081.pdf" H 7650 2150 50 0001 C CNN 4 7600 1950 1 0 0 1 $EndComp Wire Wire Line 7100 2050 7300 2050 Wire Wire Line 7300 1850 7150 1850 Wire Wire Line 7150 1850 7150 1500 Wire Wire Line 7150 1500 8000 1500 Wire Wire Line 8000 1500 8000 1950 Wire Wire Line 8000 1950 7900 1950 $Comp L Diode:1N4148WS D? U 1 1 5FF56503 P 8250 1950 F 0 "D?" H 8250 1850 50 0000 L CNN F 1 "1N4148WS" H 8050 2050 50 0000 L CNN F 2 "Diode_SMD:D_SOD-323" H 8250 1775 50 0001 C CNN F 3 "https://www.vishay.com/docs/85751/1n4148ws.pdf" H 8250 1950 50 0001 C CNN 1 8250 1950 1 0 0 -1 $EndComp Wire Wire Line 8100 1950 8000 1950 Connection ~ 8000 1950 Wire Wire Line 3250 3850 3250 2650 Wire Wire Line 3250 2650 5150 2650 Connection ~ 3250 3850 Wire Wire Line 5450 2650 5850 2650 Wire Wire Line 6150 2850 6150 3850 Text HLabel 7500 2500 0 50 Input ~ 0 DEC_1 Text HLabel 7500 2700 0 50 Input ~ 0 DEC_2 Wire Wire Line 7500 2500 8550 2500 Wire Wire Line 8550 2500 8550 1950 Wire Wire Line 8550 1950 8400 1950 Text HLabel 6500 3650 2 50 Input ~ 0 ATK_1 Text HLabel 7400 3650 0 50 Input ~ 0 ATK_2 Wire Wire Line 6000 3650 6500 3650 Text HLabel 6300 5200 2 50 Input ~ 0 REL_1 Text HLabel 7550 5200 0 50 Input ~ 0 REL_2 Wire Wire Line 5650 5200 6300 5200 $Comp L Device:R R? U 1 1 5FF63FB1 P 8050 3450 F 0 "R?" V 8150 3450 50 0000 L CNN F 1 "680R" V 7950 3400 50 0000 L CNN F 2 "" V 7980 3450 50 0001 C CNN F 3 "~" H 8050 3450 50 0001 C CNN 1 8050 3450 0 -1 -1 0 $EndComp $Comp L Device:R R? U 1 1 5FF643D5 P 8050 3750 F 0 "R?" V 8150 3750 50 0000 L CNN F 1 "120R" V 7950 3700 50 0000 L CNN F 2 "" V 7980 3750 50 0001 C CNN F 3 "~" H 8050 3750 50 0001 C CNN 1 8050 3750 0 -1 -1 0 $EndComp $Comp L Device:R R? U 1 1 5FF646B9 P 8050 2700 F 0 "R?" V 8150 2700 50 0000 L CNN F 1 "100R" V 7950 2650 50 0000 L CNN F 2 "" V 7980 2700 50 0001 C CNN F 3 "~" H 8050 2700 50 0001 C CNN 1 8050 2700 0 -1 -1 0 $EndComp $Comp L Device:R R? U 1 1 5FF64A71 P 8000 5200 F 0 "R?" V 8100 5200 50 0000 L CNN F 1 "100R" V 7900 5150 50 0000 L CNN F 2 "" V 7930 5200 50 0001 C CNN F 3 "~" H 8000 5200 50 0001 C CNN 1 8000 5200 0 -1 -1 0 $EndComp Wire Wire Line 7850 5200 7550 5200 Wire Wire Line 7400 3650 7550 3650 Wire Wire Line 7550 3650 7550 3450 Wire Wire Line 7550 3450 7900 3450 Wire Wire Line 8200 3450 8500 3450 Wire Wire Line 8500 3450 8500 3600 Wire Wire Line 8500 3750 8200 3750 $Comp L Diode:1N4148WS D? U 1 1 5FF67FA2 P 8750 3600 F 0 "D?" H 8750 3500 50 0000 L CNN F 1 "1N4148WS" H 8550 3700 50 0000 L CNN F 2 "Diode_SMD:D_SOD-323" H 8750 3425 50 0001 C CNN F 3 "https://www.vishay.com/docs/85751/1n4148ws.pdf" H 8750 3600 50 0001 C CNN 1 8750 3600 -1 0 0 1 $EndComp Wire Wire Line 8600 3600 8500 3600 Connection ~ 8500 3600 Wire Wire Line 8500 3600 8500 3750 Wire Wire Line 8200 2700 9000 2700 Wire Wire Line 9000 2700 9000 3600 Wire Wire Line 9000 3600 8900 3600 Wire Wire Line 7500 2700 7900 2700 Wire Wire Line 8150 5200 9000 5200 Wire Wire Line 9000 5200 9000 4300 Connection ~ 9000 3600 $Comp L Amplifier_Operational:TL084 U? U 1 1 5FF7BE26 P 9800 3850 F 0 "U?" H 9800 3483 50 0000 C CNN F 1 "TL084" H 9800 3574 50 0000 C CNN F 2 "" H 9750 3950 50 0001 C CNN F 3 "http://www.ti.com/lit/ds/symlink/tl081.pdf" H 9850 4050 50 0001 C CNN 1 9800 3850 1 0 0 1 $EndComp $Comp L Amplifier_Operational:TL084 U? U 2 1 5FF7D28B P 9900 5900 F 0 "U?" H 9900 6267 50 0000 C CNN F 1 "TL084" H 9900 6176 50 0000 C CNN F 2 "" H 9850 6000 50 0001 C CNN F 3 "http://www.ti.com/lit/ds/symlink/tl081.pdf" H 9950 6100 50 0001 C CNN 2 9900 5900 1 0 0 -1 $EndComp $Comp L Device:C C? U 1 1 5FF7EC54 P 9400 4750 F 0 "C?" V 9250 4700 50 0000 L CNN F 1 "10u" V 9550 4700 50 0000 L CNN F 2 "Capacitor_SMD:C_1206_3216Metric" H 9438 4600 50 0001 C CNN F 3 "~" H 9400 4750 50 0001 C CNN 1 9400 4750 -1 0 0 1 $EndComp $Comp L Device:C C? U 1 1 5FF7F06C P 9850 4750 F 0 "C?" V 9700 4700 50 0000 L CNN F 1 "1u" V 10000 4700 50 0000 L CNN F 2 "Capacitor_SMD:C_1206_3216Metric" H 9888 4600 50 0001 C CNN F 3 "~" H 9850 4750 50 0001 C CNN 1 9850 4750 -1 0 0 1 $EndComp Wire Wire Line 9500 3750 9400 3750 Wire Wire Line 10200 3850 10100 3850 Wire Wire Line 9500 3950 9000 3950 Connection ~ 9000 3950 Wire Wire Line 9000 3950 9000 3600 Wire Wire Line 6000 4050 6200 4050 Wire Wire Line 6200 4050 6200 5450 Wire Wire Line 6200 5450 10200 5450 Wire Wire Line 10200 5400 10200 3850 Connection ~ 10200 3850 $Comp L Device:R R? U 1 1 5FF88268 P 9800 3250 F 0 "R?" V 9900 3250 50 0000 L CNN F 1 "39k" V 9700 3200 50 0000 L CNN F 2 "Resistor_SMD:R_0603_1608Metric" V 9730 3250 50 0001 C CNN F 3 "~" H 9800 3250 50 0001 C CNN 1 9800 3250 0 -1 -1 0 $EndComp $Comp L Device:R R? U 1 1 5FF88949 P 9200 3500 F 0 "R?" V 9300 3500 50 0000 L CNN F 1 "10k" V 9100 3450 50 0000 L CNN F 2 "Resistor_SMD:R_0603_1608Metric" V 9130 3500 50 0001 C CNN F 3 "~" H 9200 3500 50 0001 C CNN 1 9200 3500 1 0 0 -1 $EndComp Wire Wire Line 9200 3350 9200 3250 Wire Wire Line 9200 3250 9400 3250 Wire Wire Line 9950 3250 10200 3250 Wire Wire Line 10200 3250 10200 3850 Wire Wire Line 9400 3250 9400 3750 Connection ~ 9400 3250 Wire Wire Line 9400 3250 9650 3250 $Comp L power:GND #PWR? U 1 1 5FF8E351 P 9200 3650 F 0 "#PWR?" H 9200 3400 50 0001 C CNN F 1 "GND" H 9205 3477 50 0000 C CNN F 2 "" H 9200 3650 50 0001 C CNN F 3 "" H 9200 3650 50 0001 C CNN 1 9200 3650 1 0 0 -1 $EndComp $Comp L power:GND #PWR? U 1 1 5FF91A96 P 9650 5050 F 0 "#PWR?" H 9650 4800 50 0001 C CNN F 1 "GND" H 9655 4877 50 0000 C CNN F 2 "" H 9650 5050 50 0001 C CNN F 3 "" H 9650 5050 50 0001 C CNN 1 9650 5050 1 0 0 -1 $EndComp Wire Wire Line 9400 4900 9400 5050 Wire Wire Line 9400 5050 9650 5050 Wire Wire Line 9850 5050 9850 4900 Connection ~ 9650 5050 Wire Wire Line 9650 5050 9850 5050 Wire Wire Line 9000 4300 9650 4300 Wire Wire Line 9650 4300 9650 4500 Connection ~ 9000 4300 Wire Wire Line 9000 4300 9000 3950 Wire Wire Line 7550 4100 7550 3650 Connection ~ 7550 3650 Wire Wire Line 7750 4100 7750 3750 Wire Wire Line 7750 3750 7900 3750 $EndSCHEMATC