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D20rcm.sch
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EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 3 4
Title "RTB D20 NEM651 Decoder"
Date "2024-11-15"
Rev "1"
Comp "Frank Schumacher"
Comment1 "Double sided NEM651"
Comment2 "D20.1"
Comment3 ""
Comment4 "Licensed under the Apache License, Version 2"
$EndDescr
Text Notes 650 800 0 118 ~ 0
RcmTX
$Comp
L Device:R R7
U 1 1 5FD5C082
P 6800 1700
F 0 "R7" V 6700 1700 50 0000 C CNN
F 1 "220k" V 6800 1700 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 6730 1700 50 0001 C CNN
F 3 "~" H 6800 1700 50 0001 C CNN
1 6800 1700
0 -1 -1 0
$EndComp
$Comp
L Device:R R9
U 1 1 5FD5CB88
P 7250 1700
F 0 "R9" V 7150 1700 50 0000 C CNN
F 1 "9.1k" V 7250 1700 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 7180 1700 50 0001 C CNN
F 3 "~" H 7250 1700 50 0001 C CNN
1 7250 1700
0 -1 -1 0
$EndComp
Wire Wire Line
6950 1700 7000 1700
Text GLabel 6650 1700 0 50 Input ~ 0
DCC-a
$Comp
L power:GND #PWR?
U 1 1 5FD5E2AC
P 7400 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 7400 1450 50 0001 C CNN
F 1 "GND" H 7405 1527 50 0000 C CNN
F 2 "" H 7400 1700 50 0001 C CNN
F 3 "" H 7400 1700 50 0001 C CNN
1 7400 1700
0 -1 -1 0
$EndComp
Text GLabel 6650 1500 0 50 Output ~ 0
UDCC-a
Wire Wire Line
6650 1500 7000 1500
Wire Wire Line
7000 1500 7000 1700
Connection ~ 7000 1700
Wire Wire Line
7000 1700 7100 1700
$Comp
L Device:R R8
U 1 1 5FD60754
P 6800 2300
F 0 "R8" V 6700 2300 50 0000 C CNN
F 1 "220k" V 6800 2300 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 6730 2300 50 0001 C CNN
F 3 "~" H 6800 2300 50 0001 C CNN
1 6800 2300
0 -1 -1 0
$EndComp
$Comp
L Device:R R10
U 1 1 5FD6075E
P 7250 2300
F 0 "R10" V 7150 2300 50 0000 C CNN
F 1 "9.1k" V 7250 2300 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 7180 2300 50 0001 C CNN
F 3 "~" H 7250 2300 50 0001 C CNN
1 7250 2300
0 -1 -1 0
$EndComp
Wire Wire Line
6950 2300 7000 2300
Text GLabel 6650 2300 0 50 Input ~ 0
DCC-b
$Comp
L power:GND #PWR?
U 1 1 5FD6076A
P 7400 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 7400 2050 50 0001 C CNN
F 1 "GND" H 7405 2127 50 0000 C CNN
F 2 "" H 7400 2300 50 0001 C CNN
F 3 "" H 7400 2300 50 0001 C CNN
1 7400 2300
0 -1 -1 0
$EndComp
Text GLabel 6650 2100 0 50 Output ~ 0
UDCC-b
Wire Wire Line
6650 2100 7000 2100
Wire Wire Line
7000 2100 7000 2300
Connection ~ 7000 2300
Wire Wire Line
7000 2300 7100 2300
Text GLabel 1900 2800 0 50 Input ~ 0
DCC-b
$Comp
L Device:R R4
U 1 1 60C01040
P 2800 1700
F 0 "R4" V 2700 1700 50 0000 C CNN
F 1 "22" V 2800 1700 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 2730 1700 50 0001 C CNN
F 3 "~" H 2800 1700 50 0001 C CNN
1 2800 1700
1 0 0 -1
$EndComp
$Comp
L Transistor_BJT:BC857BDW1 Q2
U 1 1 60B9A488
P 3200 1950
F 0 "Q2" H 3390 1904 50 0000 L CNN
F 1 "BC857BDW1" H 3390 1995 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-666" H 3400 2050 50 0001 C CNN
F 3 "http://www.onsemi.com/pub_link/Collateral/BC856BDW1T1-D.PDF" H 3200 1950 50 0001 C CNN
1 3200 1950
1 0 0 1
$EndComp
$Comp
L Transistor_BJT:BC857BDW1 Q2
U 2 1 60B9DC7D
P 2900 2350
F 0 "Q2" H 3091 2304 50 0000 L CNN
F 1 "BC857BDW1" H 3091 2395 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-666" H 3100 2450 50 0001 C CNN
F 3 "http://www.onsemi.com/pub_link/Collateral/BC856BDW1T1-D.PDF" H 2900 2350 50 0001 C CNN
2 2900 2350
-1 0 0 1
$EndComp
Wire Wire Line
2800 2150 2800 1950
Wire Wire Line
2800 1950 3000 1950
Wire Wire Line
3100 2350 3300 2350
Wire Wire Line
3300 2350 3300 2150
Wire Wire Line
3300 1750 3300 1300
Wire Wire Line
2800 1300 2800 1550
Wire Wire Line
2800 1850 2800 1950
Connection ~ 2800 1950
Connection ~ 3300 2350
$Comp
L Transistor_BJT:BC847BDW1 Q1
U 1 1 60E839E2
P 2600 3000
F 0 "Q1" H 2791 3046 50 0000 L CNN
F 1 "BC847BDW1" H 2791 2955 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-666" H 2800 3100 50 0001 C CNN
F 3 "http://www.onsemi.com/pub_link/Collateral/BC846BDW1T1-D.PDF" H 2600 3000 50 0001 C CNN
1 2600 3000
-1 0 0 -1
$EndComp
Wire Wire Line
3300 1300 2800 1300
Connection ~ 3300 1300
$Comp
L power:+3V3 #PWR?
U 1 1 60D9BD7E
P 3300 1300
AR Path="/5B6C6B9D/60D9BD7E" Ref="#PWR?" Part="1"
AR Path="/5B6D3404/60D9BD7E" Ref="#PWR0113" Part="1"
F 0 "#PWR0113" H 3300 1150 50 0001 C CNN
F 1 "+3V3" H 3315 1473 50 0000 C CNN
F 2 "" H 3300 1300 50 0001 C CNN
F 3 "" H 3300 1300 50 0001 C CNN
1 3300 1300
1 0 0 -1
$EndComp
Wire Wire Line
3300 2350 3550 2350
Wire Wire Line
3850 2350 4150 2350
Text GLabel 4150 2350 2 50 Input ~ 0
RCM.tx
$Comp
L Device:R R6
U 1 1 60BA304E
P 3700 2350
F 0 "R6" V 3800 2350 50 0000 C CNN
F 1 "10k" V 3700 2350 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 3630 2350 50 0001 C CNN
F 3 "~" H 3700 2350 50 0001 C CNN
1 3700 2350
0 1 1 0
$EndComp
Wire Wire Line
2500 3200 2500 3350
Wire Wire Line
2500 3350 2800 3350
Wire Wire Line
2800 3350 2800 3000
Wire Wire Line
2500 2800 1900 2800
Wire Wire Line
2800 2550 2800 3000
Connection ~ 2800 3000
$Comp
L Device:R R5
U 1 1 60E99D1D
P 3100 3000
F 0 "R5" V 3200 3000 50 0000 C CNN
F 1 "10k" V 3100 3000 50 0000 C CNN
F 2 "Resistor_SMD:R_0402_1005Metric" V 3030 3000 50 0001 C CNN
F 3 "~" H 3100 3000 50 0001 C CNN
1 3100 3000
0 1 1 0
$EndComp
Wire Wire Line
2800 3000 2950 3000
$Comp
L Transistor_BJT:BC847BDW1 Q1
U 2 1 60E9A4D6
P 2600 3750
F 0 "Q1" H 2791 3796 50 0000 L CNN
F 1 "BC847BDW1" H 2791 3705 50 0000 L CNN
F 2 "Package_TO_SOT_SMD:SOT-666" H 2800 3850 50 0001 C CNN
F 3 "http://www.onsemi.com/pub_link/Collateral/BC846BDW1T1-D.PDF" H 2600 3750 50 0001 C CNN
2 2600 3750
-1 0 0 -1
$EndComp
Wire Wire Line
1900 3550 2500 3550
Text GLabel 1900 3550 0 50 Input ~ 0
DCC-a
Wire Wire Line
2800 3750 3350 3750
Wire Wire Line
3350 3750 3350 3000
Wire Wire Line
3350 3000 3250 3000
$Comp
L power:GND #PWR?
U 1 1 60E9ED99
P 2500 3950
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 2500 3700 50 0001 C CNN
F 1 "GND" H 2505 3777 50 0000 C CNN
F 2 "" H 2500 3950 50 0001 C CNN
F 3 "" H 2500 3950 50 0001 C CNN
1 2500 3950
1 0 0 -1
$EndComp
Wire Notes Line
1100 950 5050 950
Wire Notes Line
5050 950 5050 4250
Wire Notes Line
5050 4250 1100 4250
Wire Notes Line
1100 4250 1100 950
Wire Notes Line
5550 950 9500 950
Wire Notes Line
9500 950 9500 2800
Wire Notes Line
9500 2800 5550 2800
Wire Notes Line
5550 2800 5550 950
Text Notes 5650 1100 0 50 ~ 10
Track Voltage Sensors
Text Notes 1200 1100 0 50 ~ 10
Railcom TX
$EndSCHEMATC