Auto cutoff battery charger

arhamjaffer·auto-cutoff-battery-charger

Auto cutoff battery charger PCB layout, top view — open source board by arhamjaffer

About the Auto cutoff battery charger PCB

Auto cutoff battery charger is an open source PCB design by arhamjaffer, published on GitHub. It is a 2-layer board measuring 35.7 × 35.8 mm, with 17 components from 15 distinct parts.

Other key parts include the LM317_TO-220. By type, the board carries 5 diodes, 4 resistors, 3 connectors, 2 capacitors, 1 IC and 1 transistor.

It belongs with the power & battery designs in this gallery.

From the project

PCB-based charging circuit with automatic cut-off; optimized for safe long-term operation

An automatic battery charger with cut-off protection — designed to safely charge a 12V lead-acid battery and automatically disconnect when fully charged, preventing overcharging and extending battery life.

This project covers the full PCB design cycle: circuit design, schematic capture in KiCad, component selection, PCB layout, and fabrication-ready Gerber export.

Auto cutoff battery charger, from the project README — From the project README

Main components on the Auto cutoff battery charger

Auto cutoff battery charger bill of materials (BOM)

17 components, 15 distinct parts.

Qty	Part	Footprint	Refs
1	LM317_TO-220	TO-220-3_Vertical	U1
1	BD139	TO-126-3_Vertical	Q1
2	Conn_01x02_Pin	PinHeader_1x02_P2.54mm_Vertical	J1, J3
1	Conn_01x02	PinHeader_1x02_P2.54mm_Vertical	J2
1	10k	Potentiometer_Bourns_3296W_Vertical	RV1
1	D_Bridge_+-AA	Diode_Bridge_Round_D9.8mm	D1
1	1N4007	D_DO-41_SOD81_P10.16mm_Horizontal	D2
1	D_Zener	D_DO-41_SOD81_P10.16mm_Horizontal	D3
2	LED	LED_D5.0mm	D4, D5
1	1000u	CP_Radial_D10.0mm_P5.00mm	C1
1	0.1u	CP_Radial_D10.0mm_P5.00mm	C2
1	220	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1
1	2k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R2
1	1k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3
1	10	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R4

Auto cutoff battery charger design files

The KiCad project lives in the arhamjaffer/auto-cutoff-battery-charger repository on GitHub; these links point at the commit this page was built from.

LayoutAUTO CUT OFF CHARGER.kicad_pcb
SchematicAUTO CUT OFF CHARGER.kicad_sch

Auto cutoff battery charger: common questions

How big is the Auto cutoff battery charger PCB?

The Auto cutoff battery charger measures 35.7 × 35.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Auto cutoff battery charger?

17 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the Auto cutoff battery charger design files?

From the arhamjaffer/auto-cutoff-battery-charger repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Auto cutoff battery charger design in my own project?

The repository has no license, so all rights stay with arhamjaffer. Use it as a reference, and ask the author before reusing the design.

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