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D12rcm.sch
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EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 2 4
Title "RTB D12 Decoder"
Date "2024-11-24"
Rev "5"
Comp "Frank Schumacher"
Comment1 "Flm V100 Decoder"
Comment2 ""
Comment3 ""
Comment4 "Licensed under the Apache License, Version 2"
$EndDescr
Text Notes 650 800 0 118 ~ 0
Railcom
$Comp
L Device:R R34
U 1 1 5FD5C082
P 1950 1700
F 0 "R34" V 1850 1700 50 0000 C CNN
F 1 "220k" V 1950 1700 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 1880 1700 50 0001 C CNN
F 3 "~" H 1950 1700 50 0001 C CNN
1 1950 1700
0 -1 -1 0
$EndComp
$Comp
L Device:R R36
U 1 1 5FD5CB88
P 2400 1700
F 0 "R36" V 2300 1700 50 0000 C CNN
F 1 "9.1k" V 2400 1700 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 2330 1700 50 0001 C CNN
F 3 "~" H 2400 1700 50 0001 C CNN
1 2400 1700
0 -1 -1 0
$EndComp
Wire Wire Line
2100 1700 2150 1700
Text GLabel 1800 1700 0 50 Input ~ 0
DCC-a
$Comp
L power:GND #PWR?
U 1 1 5FD5E2AC
P 2550 1700
AR Path="/5B6C6B9D/5FD5E2AC" Ref="#PWR?" Part="1"
AR Path="/5CA7768A/5FD5E2AC" Ref="#PWR?" Part="1"
AR Path="/5B6D3404/5FD5E2AC" Ref="#PWR0128" Part="1"
F 0 "#PWR0128" H 2550 1450 50 0001 C CNN
F 1 "GND" H 2555 1527 50 0000 C CNN
F 2 "" H 2550 1700 50 0001 C CNN
F 3 "" H 2550 1700 50 0001 C CNN
1 2550 1700
0 -1 -1 0
$EndComp
Text GLabel 1800 1500 0 50 Output ~ 0
UDCC-a
Wire Wire Line
1800 1500 2150 1500
Wire Wire Line
2150 1500 2150 1700
Connection ~ 2150 1700
Wire Wire Line
2150 1700 2250 1700
$Comp
L Device:R R35
U 1 1 5FD60754
P 1950 2300
F 0 "R35" V 1850 2300 50 0000 C CNN
F 1 "220k" V 1950 2300 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 1880 2300 50 0001 C CNN
F 3 "~" H 1950 2300 50 0001 C CNN
1 1950 2300
0 -1 -1 0
$EndComp
$Comp
L Device:R R37
U 1 1 5FD6075E
P 2400 2300
F 0 "R37" V 2300 2300 50 0000 C CNN
F 1 "9.1k" V 2400 2300 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 2330 2300 50 0001 C CNN
F 3 "~" H 2400 2300 50 0001 C CNN
1 2400 2300
0 -1 -1 0
$EndComp
Wire Wire Line
2100 2300 2150 2300
Text GLabel 1800 2300 0 50 Input ~ 0
DCC-b
$Comp
L power:GND #PWR?
U 1 1 5FD6076A
P 2550 2300
AR Path="/5B6C6B9D/5FD6076A" Ref="#PWR?" Part="1"
AR Path="/5CA7768A/5FD6076A" Ref="#PWR?" Part="1"
AR Path="/5B6D3404/5FD6076A" Ref="#PWR0130" Part="1"
F 0 "#PWR0130" H 2550 2050 50 0001 C CNN
F 1 "GND" H 2555 2127 50 0000 C CNN
F 2 "" H 2550 2300 50 0001 C CNN
F 3 "" H 2550 2300 50 0001 C CNN
1 2550 2300
0 -1 -1 0
$EndComp
Text GLabel 1800 2100 0 50 Output ~ 0
UDCC-b
Wire Wire Line
1800 2100 2150 2100
Wire Wire Line
2150 2100 2150 2300
Connection ~ 2150 2300
Wire Wire Line
2150 2300 2250 2300
Text GLabel 4150 3050 0 50 Input ~ 0
DCC-b
$Comp
L Connector_Generic:Conn_01x01 J2
U 1 1 60B7D82B
P 2100 3900
F 0 "J2" H 2180 3942 50 0000 L CNN
F 1 "Conn_01x01" H 2180 3851 50 0000 L CNN
F 2 "TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm" H 2100 3900 50 0001 C CNN
F 3 "~" H 2100 3900 50 0001 C CNN
1 2100 3900
1 0 0 -1
$EndComp
$Comp
L Connector_Generic:Conn_01x01 J3
U 1 1 60B7E696
P 2100 4100
F 0 "J3" H 2180 4142 50 0000 L CNN
F 1 "Conn_01x01" H 2180 4051 50 0000 L CNN
F 2 "TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm" H 2100 4100 50 0001 C CNN
F 3 "~" H 2100 4100 50 0001 C CNN
1 2100 4100
1 0 0 -1
$EndComp
$Comp
L Connector_Generic:Conn_01x01 J4
U 1 1 60B7FD8A
P 2100 4300
F 0 "J4" H 2180 4342 50 0000 L CNN
F 1 "Conn_01x01" H 2180 4251 50 0000 L CNN
F 2 "TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm" H 2100 4300 50 0001 C CNN
F 3 "~" H 2100 4300 50 0001 C CNN
1 2100 4300
1 0 0 -1
$EndComp
$Comp
L Connector_Generic:Conn_01x01 J6
U 1 1 60B8006B
P 2100 4500
F 0 "J6" H 2180 4542 50 0000 L CNN
F 1 "Conn_01x01" H 2180 4451 50 0000 L CNN
F 2 "TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm" H 2100 4500 50 0001 C CNN
F 3 "~" H 2100 4500 50 0001 C CNN
1 2100 4500
1 0 0 -1
$EndComp
Text GLabel 1900 3900 0 50 Input ~ 0
DCC-a
Text GLabel 1900 4300 0 50 Input ~ 0
DCC-a
Text GLabel 1900 4100 0 50 Input ~ 0
DCC-b
Text GLabel 1900 4500 0 50 Input ~ 0
DCC-b
$Comp
L Device:R R3
U 1 1 60C01040
P 5050 1950
F 0 "R3" V 4950 1950 50 0000 C CNN
F 1 "22" V 5050 1950 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 4980 1950 50 0001 C CNN
F 3 "~" H 5050 1950 50 0001 C CNN
1 5050 1950
1 0 0 -1
$EndComp
$Comp
L Transistor_BJT:BC857BDW1 Q1
U 1 1 60B9A488
P 5450 2200
F 0 "Q1" H 5640 2154 50 0000 L CNN
F 1 "BC857BDW1" H 5640 2245 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-666" H 5650 2300 50 0001 C CNN
F 3 "http://www.onsemi.com/pub_link/Collateral/BC856BDW1T1-D.PDF" H 5450 2200 50 0001 C CNN
1 5450 2200
1 0 0 1
$EndComp
$Comp
L Transistor_BJT:BC857BDW1 Q1
U 2 1 60B9DC7D
P 5150 2600
F 0 "Q1" H 5341 2554 50 0000 L CNN
F 1 "BC857BDW1" H 5341 2645 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-666" H 5350 2700 50 0001 C CNN
F 3 "http://www.onsemi.com/pub_link/Collateral/BC856BDW1T1-D.PDF" H 5150 2600 50 0001 C CNN
2 5150 2600
-1 0 0 1
$EndComp
Wire Wire Line
5050 2400 5050 2200
Wire Wire Line
5050 2200 5250 2200
Wire Wire Line
5350 2600 5550 2600
Wire Wire Line
5550 2600 5550 2400
Wire Wire Line
5550 2000 5550 1550
Wire Wire Line
5050 1550 5050 1800
Wire Wire Line
5050 2100 5050 2200
Connection ~ 5050 2200
Connection ~ 5550 2600
$Comp
L Transistor_BJT:BC847BDW1 Q2
U 1 1 60E839E2
P 4850 3250
F 0 "Q2" H 5041 3296 50 0000 L CNN
F 1 "BC847BDW1" H 5041 3205 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-666" H 5050 3350 50 0001 C CNN
F 3 "http://www.onsemi.com/pub_link/Collateral/BC846BDW1T1-D.PDF" H 4850 3250 50 0001 C CNN
1 4850 3250
-1 0 0 -1
$EndComp
Wire Wire Line
5550 1550 5050 1550
Connection ~ 5550 1550
$Comp
L power:+3V3 #PWR?
U 1 1 60D9BD7E
P 5550 1550
AR Path="/5B6C6B9D/60D9BD7E" Ref="#PWR?" Part="1"
AR Path="/5B6D3404/60D9BD7E" Ref="#PWR0113" Part="1"
F 0 "#PWR0113" H 5550 1400 50 0001 C CNN
F 1 "+3V3" H 5565 1723 50 0000 C CNN
F 2 "" H 5550 1550 50 0001 C CNN
F 3 "" H 5550 1550 50 0001 C CNN
1 5550 1550
1 0 0 -1
$EndComp
Wire Wire Line
5550 2600 5800 2600
Wire Wire Line
6100 2600 6400 2600
Text GLabel 6400 2600 2 50 Input ~ 0
RCM.tx
$Comp
L Device:R R15
U 1 1 60BA304E
P 5950 2600
F 0 "R15" V 5850 2600 50 0000 C CNN
F 1 "10k" V 5950 2600 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 5880 2600 50 0001 C CNN
F 3 "~" H 5950 2600 50 0001 C CNN
1 5950 2600
0 1 1 0
$EndComp
Wire Wire Line
4750 3450 4750 3600
Wire Wire Line
4750 3600 5050 3600
Wire Wire Line
5050 3600 5050 3250
Wire Wire Line
4750 3050 4150 3050
Wire Wire Line
5050 2800 5050 3250
Connection ~ 5050 3250
$Comp
L Device:R R18
U 1 1 60E99D1D
P 5350 3250
F 0 "R18" V 5250 3250 50 0000 C CNN
F 1 "10k" V 5350 3250 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 5280 3250 50 0001 C CNN
F 3 "~" H 5350 3250 50 0001 C CNN
1 5350 3250
0 1 1 0
$EndComp
Wire Wire Line
5050 3250 5200 3250
$Comp
L Transistor_BJT:BC847BDW1 Q2
U 2 1 60E9A4D6
P 4850 4000
F 0 "Q2" H 5041 4046 50 0000 L CNN
F 1 "BC847BDW1" H 5041 3955 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-666" H 5050 4100 50 0001 C CNN
F 3 "http://www.onsemi.com/pub_link/Collateral/BC846BDW1T1-D.PDF" H 4850 4000 50 0001 C CNN
2 4850 4000
-1 0 0 -1
$EndComp
Wire Wire Line
4150 3800 4750 3800
Text GLabel 4150 3800 0 50 Input ~ 0
DCC-a
Wire Wire Line
5050 4000 5600 4000
Wire Wire Line
5600 4000 5600 3250
Wire Wire Line
5600 3250 5500 3250
$Comp
L power:GND #PWR?
U 1 1 60E9ED99
P 4750 4200
AR Path="/5B6C6B9D/60E9ED99" Ref="#PWR?" Part="1"
AR Path="/5CA7768A/60E9ED99" Ref="#PWR?" Part="1"
AR Path="/5B6D3404/60E9ED99" Ref="#PWR0114" Part="1"
F 0 "#PWR0114" H 4750 3950 50 0001 C CNN
F 1 "GND" H 4755 4027 50 0000 C CNN
F 2 "" H 4750 4200 50 0001 C CNN
F 3 "" H 4750 4200 50 0001 C CNN
1 4750 4200
1 0 0 -1
$EndComp
Wire Notes Line
3500 4750 3500 1100
Wire Notes Line
3500 1100 7100 1100
Wire Notes Line
7100 1100 7100 4750
Wire Notes Line
7100 4750 3500 4750
Text Notes 3550 1250 0 50 ~ 10
Railcom transmitter (approx. 35mA)
Wire Notes Line
1000 1100 3150 1100
Wire Notes Line
3150 1100 3150 2700
Wire Notes Line
3150 2700 1000 2700
Wire Notes Line
1000 2700 1000 1100
Text Notes 1100 1250 0 50 ~ 10
Track Voltage divider
Wire Notes Line
1000 3250 3150 3250
Wire Notes Line
3150 3250 3150 4750
Wire Notes Line
3150 4750 1000 4750
Wire Notes Line
1000 4750 1000 3250
Text Notes 1100 3400 0 50 ~ 10
PCB / Chassis connector clicps
$EndSCHEMATC