--- /dev/null
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Connector_Conn_Coaxial
+#
+DEF Connector_Conn_Coaxial J 0 40 Y N 1 F N
+F0 "J" 10 120 50 H V C CNN
+F1 "Connector_Conn_Coaxial" 115 0 50 V V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ *BNC*
+ *SMA*
+ *SMB*
+ *SMC*
+ *Cinch*
+$ENDFPLIST
+DRAW
+A -2 0 71 1636 0 0 1 10 N -70 20 70 0
+A -1 0 71 0 -1638 0 1 10 N 70 0 -70 -20
+C 0 0 20 0 1 8 N
+P 2 0 1 0 -100 0 -20 0 N
+P 2 0 1 0 0 -100 0 -70 N
+X In 1 -200 0 100 R 50 50 1 1 P
+X Ext 2 0 -200 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_C
+#
+DEF Device_C C 0 10 N Y 1 F N
+F0 "C" 25 100 50 H V L CNN
+F1 "Device_C" 25 -100 50 H V L CNN
+F2 "" 38 -150 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ C_*
+$ENDFPLIST
+DRAW
+P 2 0 1 20 -80 -30 80 -30 N
+P 2 0 1 20 -80 30 80 30 N
+X ~ 1 0 150 110 D 50 50 1 1 P
+X ~ 2 0 -150 110 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_LED
+#
+DEF Device_LED D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "Device_LED" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ LED*
+ LED_SMD:*
+ LED_THT:*
+$ENDFPLIST
+DRAW
+P 2 0 1 8 -50 -50 -50 50 N
+P 2 0 1 0 -50 0 50 0 N
+P 4 0 1 8 50 -50 50 50 -50 0 50 -50 N
+P 5 0 1 0 -120 -30 -180 -90 -150 -90 -180 -90 -180 -60 N
+P 5 0 1 0 -70 -30 -130 -90 -100 -90 -130 -90 -130 -60 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R
+#
+DEF Device_R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "Device_R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Voltmeter_DC
+#
+DEF Device_Voltmeter_DC MES 0 1 N N 1 F N
+F0 "MES" -130 40 50 H V R CNN
+F1 "Device_Voltmeter_DC" -130 -30 50 H V R CNN
+F2 "" 0 100 50 V I C CNN
+F3 "" 0 100 50 V I C CNN
+DRAW
+C 0 0 100 0 1 10 N
+T 0 0 0 100 0 0 0 V Normal 0 C C
+P 2 0 0 0 -125 -125 -75 -75 N
+P 2 0 0 0 75 75 125 125 N
+P 3 0 0 0 75 125 125 125 125 75 N
+P 2 0 1 0 10 150 30 150 N
+P 2 0 1 0 20 160 20 140 N
+X - 1 0 -200 100 U 50 50 1 1 P
+X + 2 0 200 100 D 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Switch_SW_DPST
+#
+DEF Switch_SW_DPST SW 0 0 Y N 1 F N
+F0 "SW" 0 200 50 H V C CNN
+F1 "Switch_SW_DPST" 0 -200 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+C -80 -100 20 0 0 0 N
+C -80 100 20 0 0 0 N
+C 80 -100 20 0 0 0 N
+C 80 100 20 0 0 0 N
+P 2 0 0 0 -60 -90 50 -40 N
+P 2 0 0 0 -60 110 50 160 N
+P 2 0 0 0 0 -50 0 -25 N
+P 2 0 0 0 0 0 0 25 N
+P 2 0 0 0 0 50 0 75 N
+P 2 0 0 0 0 100 0 125 N
+X 1 1 -200 -100 100 R 50 50 1 1 P
+X 2 2 200 -100 100 L 50 50 1 1 P
+X 3 3 -200 100 100 R 50 50 1 1 P
+X 4 4 200 100 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# power_GND
+#
+DEF power_GND #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "power_GND" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
+X GND 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+#End Library
--- /dev/null
+(kicad_pcb (version 4) (host kicad "dummy file") )
--- /dev/null
+update=22/05/2015 07:44:53
+version=1
+last_client=kicad
+[general]
+version=1
+RootSch=
+BoardNm=
+[pcbnew]
+version=1
+LastNetListRead=
+UseCmpFile=1
+PadDrill=0.600000000000
+PadDrillOvalY=0.600000000000
+PadSizeH=1.500000000000
+PadSizeV=1.500000000000
+PcbTextSizeV=1.500000000000
+PcbTextSizeH=1.500000000000
+PcbTextThickness=0.300000000000
+ModuleTextSizeV=1.000000000000
+ModuleTextSizeH=1.000000000000
+ModuleTextSizeThickness=0.150000000000
+SolderMaskClearance=0.000000000000
+SolderMaskMinWidth=0.000000000000
+DrawSegmentWidth=0.200000000000
+BoardOutlineThickness=0.100000000000
+ModuleOutlineThickness=0.150000000000
+[cvpcb]
+version=1
+NetIExt=net
+[eeschema]
+version=1
+LibDir=
+[eeschema/libraries]
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 2
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
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+F 1 "PWR in 3V" H 2778 2697 50 0000 C CNN
+F 2 "" H 2850 2550 50 0001 C CNN
+F 3 " ~" H 2850 2550 50 0001 C CNN
+ 1 2850 2550
+ -1 0 0 -1
+$EndComp
+$Comp
+L Connector:Conn_Coaxial J2
+U 1 1 5E52AD78
+P 4000 3800
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+F 1 "battery" H 3928 3947 50 0000 C CNN
+F 2 "" H 4000 3800 50 0001 C CNN
+F 3 " ~" H 4000 3800 50 0001 C CNN
+ 1 4000 3800
+ -1 0 0 -1
+$EndComp
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+F 2 "" V 4480 4500 50 0001 C CNN
+F 3 "~" H 4550 4500 50 0001 C CNN
+ 1 4550 4500
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:LED D2
+U 1 1 5E52D41A
+P 4550 4000
+F 0 "D2" V 4589 3883 50 0000 R CNN
+F 1 "battery connected indicator" V 4498 3883 50 0000 R CNN
+F 2 "" H 4550 4000 50 0001 C CNN
+F 3 "~" H 4550 4000 50 0001 C CNN
+ 1 4550 4000
+ 0 -1 -1 0
+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+$Comp
+L power:GND #PWR04
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+F 1 "GND" H 4555 4577 50 0000 C CNN
+F 2 "" H 4550 4750 50 0001 C CNN
+F 3 "" H 4550 4750 50 0001 C CNN
+ 1 4550 4750
+ 1 0 0 -1
+$EndComp
+$Comp
+L power:GND #PWR02
+U 1 1 5E52DDF5
+P 4000 4200
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+F 1 "GND" H 4005 4027 50 0000 C CNN
+F 2 "" H 4000 4200 50 0001 C CNN
+F 3 "" H 4000 4200 50 0001 C CNN
+ 1 4000 4200
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
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+F 1 "GND" H 2855 2727 50 0000 C CNN
+F 2 "" H 2850 2900 50 0001 C CNN
+F 3 "" H 2850 2900 50 0001 C CNN
+ 1 2850 2900
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
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+F 1 "10K" H 4620 3205 50 0000 L CNN
+F 2 "" V 4480 3250 50 0001 C CNN
+F 3 "~" H 4550 3250 50 0001 C CNN
+ 1 4550 3250
+ 1 0 0 -1
+$EndComp
+$Comp
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+U 1 1 5E53057A
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+F 1 "Vin indicator" V 4498 2632 50 0000 R CNN
+F 2 "" H 4550 2750 50 0001 C CNN
+F 3 "~" H 4550 2750 50 0001 C CNN
+ 1 4550 2750
+ 0 -1 -1 0
+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+U 1 1 5E530587
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+F 1 "GND" H 4555 3327 50 0000 C CNN
+F 2 "" H 4550 3500 50 0001 C CNN
+F 3 "" H 4550 3500 50 0001 C CNN
+ 1 4550 3500
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
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+$Sheet
+S 3400 2450 800 450
+U 5E537CE2
+F0 "Voltage step-up" 50
+F1 "voltage step up.sch" 50
+F2 "Vin" I L 3400 2550 50
+F3 "Vout_14.4V" O R 4200 2550 50
+$EndSheet
+Wire Wire Line
+ 3050 2550 3400 2550
+$Comp
+L Switch:SW_DPST SW1
+U 1 1 5E53B9C1
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+F 0 "SW1" H 5500 3875 50 0000 C CNN
+F 1 "On/Off" H 5500 3784 50 0000 C CNN
+F 2 "" H 5500 3550 50 0001 C CNN
+F 3 "~" H 5500 3550 50 0001 C CNN
+ 1 5500 3550
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 4550 2550
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 4550 3800
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+L Device:Voltmeter_DC MES1
+U 1 1 5E53D4AB
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+F 0 "MES1" H 6203 3996 50 0000 L CNN
+F 1 "Voltmeter_DC" H 6203 3905 50 0000 L CNN
+F 2 "" V 6050 4050 50 0001 C CNN
+F 3 "~" V 6050 4050 50 0001 C CNN
+ 1 6050 3950
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:C C1
+U 1 1 5E53DE9C
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+F 0 "C1" H 6965 3996 50 0000 L CNN
+F 1 "C" H 6965 3905 50 0000 L CNN
+F 2 "" H 6888 3800 50 0001 C CNN
+F 3 "~" H 6850 3950 50 0001 C CNN
+ 1 6850 3950
+ 1 0 0 -1
+$EndComp
+$Comp
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+U 1 1 5E53E204
+P 7250 3950
+F 0 "C2" H 7365 3996 50 0000 L CNN
+F 1 "C" H 7365 3905 50 0000 L CNN
+F 2 "" H 7288 3800 50 0001 C CNN
+F 3 "~" H 7250 3950 50 0001 C CNN
+ 1 7250 3950
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
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+Wire Wire Line
+ 6050 3650 5700 3650
+Connection ~ 5700 3650
+Wire Wire Line
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+Wire Wire Line
+ 6850 3650 6850 3800
+Connection ~ 6050 3650
+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 6850 3650
+Wire Wire Line
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+Wire Wire Line
+ 7250 4350 6850 4350
+Wire Wire Line
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+Wire Wire Line
+ 6050 4150 6050 4350
+Wire Wire Line
+ 6050 4350 6850 4350
+Connection ~ 6850 4350
+$Comp
+L power:GND #PWR05
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+F 1 "GND" H 6855 4427 50 0000 C CNN
+F 2 "" H 6850 4600 50 0001 C CNN
+F 3 "" H 6850 4600 50 0001 C CNN
+ 1 6850 4600
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+$EndComp
+Wire Wire Line
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+F 2 "" H 8050 4500 50 0001 C CNN
+F 3 " ~" H 8050 4500 50 0001 C CNN
+ 1 8050 4500
+ 1 0 0 -1
+$EndComp
+$Comp
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+F 3 " ~" H 8700 4500 50 0001 C CNN
+ 1 8700 4500
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+$Comp
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+F 3 " ~" H 8050 4050 50 0001 C CNN
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+$Comp
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+F 3 " ~" H 8700 4050 50 0001 C CNN
+ 1 8700 4050
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+F 2 "" H 8050 3650 50 0001 C CNN
+F 3 " ~" H 8050 3650 50 0001 C CNN
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+$Comp
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+F 3 " ~" H 8700 3650 50 0001 C CNN
+ 1 8700 3650
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+F 2 "" H 8050 3200 50 0001 C CNN
+F 3 " ~" H 8050 3200 50 0001 C CNN
+ 1 8050 3200
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+$Comp
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+F 3 " ~" H 8700 3200 50 0001 C CNN
+ 1 8700 3200
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+Connection ~ 8400 3400
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+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 8400 4250
+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 8400 4700
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+Connection ~ 7850 3650
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+Connection ~ 7850 4050
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+$Comp
+L power:GND #PWR06
+U 1 1 5E54EBF8
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+F 1 "GND" H 8405 4677 50 0000 C CNN
+F 2 "" H 8400 4850 50 0001 C CNN
+F 3 "" H 8400 4850 50 0001 C CNN
+ 1 8400 4850
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 8900 3200
+Connection ~ 7850 3200
+$EndSCHEMATC
--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 2
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L Connector:Conn_Coaxial J1
+U 1 1 5E52AB1D
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+F 1 "PWR in 3V" H 2778 2697 50 0000 C CNN
+F 2 "" H 2850 2550 50 0001 C CNN
+F 3 " ~" H 2850 2550 50 0001 C CNN
+ 1 2850 2550
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+$EndComp
+$Comp
+L Connector:Conn_Coaxial J2
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+F 2 "" H 4000 3800 50 0001 C CNN
+F 3 " ~" H 4000 3800 50 0001 C CNN
+ 1 4000 3800
+ -1 0 0 -1
+$EndComp
+$Comp
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+F 1 "10K" H 4620 4455 50 0000 L CNN
+F 2 "" V 4480 4500 50 0001 C CNN
+F 3 "~" H 4550 4500 50 0001 C CNN
+ 1 4550 4500
+ 1 0 0 -1
+$EndComp
+$Comp
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+F 2 "" H 4550 4000 50 0001 C CNN
+F 3 "~" H 4550 4000 50 0001 C CNN
+ 1 4550 4000
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+$EndComp
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+Wire Wire Line
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+$Comp
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+ 1 4000 4200
+ 1 0 0 -1
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+Wire Wire Line
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+F 2 "" H 2850 2900 50 0001 C CNN
+F 3 "" H 2850 2900 50 0001 C CNN
+ 1 2850 2900
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
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+U 1 1 5E530570
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+F 2 "" V 4480 3250 50 0001 C CNN
+F 3 "~" H 4550 3250 50 0001 C CNN
+ 1 4550 3250
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:LED D1
+U 1 1 5E53057A
+P 4550 2750
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+F 1 "Vin indicator" V 4498 2632 50 0000 R CNN
+F 2 "" H 4550 2750 50 0001 C CNN
+F 3 "~" H 4550 2750 50 0001 C CNN
+ 1 4550 2750
+ 0 -1 -1 0
+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+$Comp
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+U 1 1 5E530587
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+F 1 "GND" H 4555 3327 50 0000 C CNN
+F 2 "" H 4550 3500 50 0001 C CNN
+F 3 "" H 4550 3500 50 0001 C CNN
+ 1 4550 3500
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
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+$Sheet
+S 3400 2450 800 450
+U 5E537CE2
+F0 "Voltage step-up" 50
+F1 "voltage step up.sch" 50
+F2 "Vin" I L 3400 2550 50
+F3 "Vout_14.4V" O R 4200 2550 50
+$EndSheet
+Wire Wire Line
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+$Comp
+L Switch:SW_DPST SW1
+U 1 1 5E53B9C1
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+F 1 "On/Off" H 5500 3784 50 0000 C CNN
+F 2 "" H 5500 3550 50 0001 C CNN
+F 3 "~" H 5500 3550 50 0001 C CNN
+ 1 5500 3550
+ 1 0 0 -1
+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Connection ~ 4550 2550
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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--- /dev/null
+<!doctype html>
+<html lang="en">
+<head>
+<title>12V Lead-Acid battery changer and terminal</title>
+<!-- 2020-02-24 E 00:47 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta name="generator" content="Org-mode">
+<meta name="author" content="Svjatoslav Agejenko">
+<link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+<style type="text/css">
+footer {background-color: #111 !important;}
+pre {background-color: #111; color: #ccc;}
+</style>
+<style type="text/css">
+/* org mode styles on top of twbs */
+
+html {
+ position: relative;
+ min-height: 100%;
+}
+
+body {
+ font-size: 18px;
+ margin-bottom: 105px;
+}
+
+footer {
+ position: absolute;
+ bottom: 0;
+ width: 100%;
+ height: 101px;
+ background-color: #f5f5f5;
+}
+
+footer > div {
+ padding: 10px;
+}
+
+footer p {
+ margin: 0 0 5px;
+ text-align: center;
+ font-size: 16px;
+}
+
+#table-of-contents {
+ margin-top: 20px;
+ margin-bottom: 20px;
+}
+
+blockquote p {
+ font-size: 18px;
+}
+
+pre {
+ font-size: 16px;
+}
+
+.footpara {
+ display: inline-block;
+}
+
+figcaption {
+ font-size: 16px;
+ color: #666;
+ font-style: italic;
+ padding-bottom: 15px;
+}
+
+/* from twbs docs */
+
+.bs-docs-sidebar.affix {
+ position: static;
+}
+@media (min-width: 768px) {
+ .bs-docs-sidebar {
+ padding-left: 20px;
+ }
+}
+
+/* All levels of nav */
+.bs-docs-sidebar .nav > li > a {
+ display: block;
+ padding: 4px 20px;
+ font-size: 14px;
+ font-weight: 500;
+ color: #999;
+}
+.bs-docs-sidebar .nav > li > a:hover,
+.bs-docs-sidebar .nav > li > a:focus {
+ padding-left: 19px;
+ color: #A1283B;
+ text-decoration: none;
+ background-color: transparent;
+ border-left: 1px solid #A1283B;
+}
+.bs-docs-sidebar .nav > .active > a,
+.bs-docs-sidebar .nav > .active:hover > a,
+.bs-docs-sidebar .nav > .active:focus > a {
+ padding-left: 18px;
+ font-weight: bold;
+ color: #A1283B;
+ background-color: transparent;
+ border-left: 2px solid #A1283B;
+}
+
+/* Nav: second level (shown on .active) */
+.bs-docs-sidebar .nav .nav {
+ display: none; /* Hide by default, but at >768px, show it */
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+}
+.bs-docs-sidebar .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
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+ font-size: 12px;
+ font-weight: normal;
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+.bs-docs-sidebar .nav .nav > li > a:hover,
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+}
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+}
+
+/* Nav: third level (shown on .active) */
+.bs-docs-sidebar .nav .nav .nav {
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+}
+.bs-docs-sidebar .nav .nav .nav > li > a {
+ padding-top: 1px;
+ padding-bottom: 1px;
+ padding-left: 40px;
+ font-size: 12px;
+ font-weight: normal;
+}
+.bs-docs-sidebar .nav .nav .nav > li > a:hover,
+.bs-docs-sidebar .nav .nav .nav > li > a:focus {
+ padding-left: 39px;
+}
+.bs-docs-sidebar .nav .nav .nav > .active > a,
+.bs-docs-sidebar .nav .nav .nav > .active:hover > a,
+.bs-docs-sidebar .nav .nav .nav > .active:focus > a {
+ padding-left: 38px;
+ font-weight: 500;
+}
+
+/* Show and affix the side nav when space allows it */
+@media (min-width: 992px) {
+ .bs-docs-sidebar .nav > .active > ul {
+ display: block;
+ }
+ /* Widen the fixed sidebar */
+ .bs-docs-sidebar.affix,
+ .bs-docs-sidebar.affix-bottom {
+ width: 213px;
+ }
+ .bs-docs-sidebar.affix {
+ position: fixed; /* Undo the static from mobile first approach */
+ top: 20px;
+ }
+ .bs-docs-sidebar.affix-bottom {
+ position: absolute; /* Undo the static from mobile first approach */
+ }
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+ margin-top: 0;
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+}
+@media (min-width: 1200px) {
+ /* Widen the fixed sidebar again */
+ .bs-docs-sidebar.affix-bottom,
+ .bs-docs-sidebar.affix {
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+}
+</style>
+<script type="text/javascript">
+$(function() {
+ 'use strict';
+
+ $('.bs-docs-sidebar li').first().addClass('active');
+
+ $(document.body).scrollspy({target: '.bs-docs-sidebar'});
+
+ $('.bs-docs-sidebar').affix();
+});
+</script>
+</head>
+<body>
+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">12V Lead-Acid battery changer and terminal</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>Author:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+</li>
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+
+<figure>
+<p><img src="make,%202.png" class="img-responsive" alt="make,%202.png">
+</p>
+</figure>
+
+<p>
+Simple charger and terminal (front-end) for 12V lead-acid battery.
+</p>
+
+<p>
+Idea is to distribute power from rechargeable 12V battery to various
+appliances (soldering iron, radio transmitters, etc..) while also
+providing use-charging in the background.
+</p>
+
+<p>
+Single on/off button disconnects battery and up-step voltage source
+from front panel terminal connectors.
+</p>
+
+<p>
+<a href="https://www.amazon.de/gp/product/B07G4KWV6S/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1">Tecnoiot MT3608</a> voltage up-step is used. 3V DC external power supply
+is used to feed voltage up-step. Up-step is tuned to ~14.4 V.
+</p>
+
+
+<figure>
+<p><img src="schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+</figure>
+
+<p>
+Current design is rather of blog (experience sharing) value. It has
+quite some drawbacks:
+</p>
+
+<ul class="org-ul">
+<li>Warning: Circuit has dangerous instability. Requires low voltage
+~3V but relatively high current external power supply. Using
+higher voltage but low current power supply could easily lead to
+situation where step-up generated load pushes power supply output
+voltage down too much. This leads to too much power being lost
+within power supply and easily leads to power supply overheating!
+</li>
+
+<li>There is no dedicated current limiter. 3V external power supply
+and up-step are acting as current limiters.
+</li>
+
+<li>While RCA connectors do work as DC power connectors, but are not
+intended to be used this way and are not very reliable.
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-3" class="outline-2">
+<h2 id="sec-3"><span class="section-number-2">3</span> Body</h2>
+<div class="outline-text-2" id="text-3">
+
+<figure>
+<p><img src="body.png" class="img-responsive" alt="body.png">
+</p>
+</figure>
+
+
+<figure>
+<p><img src="cover.png" class="img-responsive" alt="cover.png">
+</p>
+</figure>
+
+
+<ul class="org-ul">
+<li>Download:
+<ul class="org-ul">
+<li><a href="body%20and%20cover.FCStd">body and cover FreeCAD file</a>
+</li>
+<li><a href="body.stl">body in STL format</a>
+</li>
+<li><a href="cover.stl">cover in STL format</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+<li><a href="#sec-3">3. Body</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2020-02-24 E 00:47</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
--- /dev/null
+#+TITLE: 12V Lead-Acid battery changer and terminal
+#+AUTHOR: Svjatoslav Agejenko
+#+LANGUAGE: en
+
+* (document settings) :noexport:
+** use dark style for TWBS-HTML exporter
+#+HTML_HEAD: <link href="https://bootswatch.com/3/darkly/bootstrap.min.css" rel="stylesheet">
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
+#+HTML_HEAD: <script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/js/bootstrap.min.js"></script>
+#+HTML_HEAD: <style type="text/css">
+#+HTML_HEAD: footer {background-color: #111 !important;}
+#+HTML_HEAD: pre {background-color: #111; color: #ccc;}
+#+HTML_HEAD: </style>
+
+* General
++ DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+ COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+ DESIGNS AT YOUR OWN RISK.
+
++ Author:
+ - Svjatoslav Agejenko
+ - Homepage: https://svjatoslav.eu
+ - Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
+
++ See also:
+ - [[../../index.html][Other physical projects in this repository]]
+ - [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
+
+* Project description
+[[file:make.png]]
+
+[[file:make,%202.png]]
+
+Simple charger and terminal (front-end) for 12V lead-acid battery.
+
+Idea is to distribute power from rechargeable 12V battery to various
+appliances (soldering iron, radio transmitters, etc..) while also
+providing use-charging in the background.
+
+Single on/off button disconnects battery and up-step voltage source
+from front panel terminal connectors.
+
+[[https://www.amazon.de/gp/product/B07G4KWV6S/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1][Tecnoiot MT3608]] voltage up-step is used. 3V DC external power supply
+is used to feed voltage up-step. Up-step is tuned to ~14.4 V.
+
+[[file:schematic.png]]
+
+Current design is rather of blog (experience sharing) value. It has
+quite some drawbacks:
+
+- Warning: Circuit has dangerous instability. Requires low voltage
+ ~3V but relatively high current external power supply. Using
+ higher voltage but low current power supply could easily lead to
+ situation where step-up generated load pushes power supply output
+ voltage down too much. This leads to too much power being lost
+ within power supply and easily leads to power supply overheating!
+
+- There is no dedicated current limiter. 3V external power supply
+ and up-step are acting as current limiters.
+
+- While RCA connectors do work as DC power connectors, but are not
+ intended to be used this way and are not very reliable.
+
+* Body
+
+[[file:body.png]]
+
+[[file:cover.png]]
+
+
++ Download:
+ + [[file:body%20and%20cover.FCStd][body and cover FreeCAD file]]
+ + [[file:body.stl][body in STL format]]
+ + [[file:cover.stl][cover in STL format]]
projects / physical.git / commitdiff
