Auto-Cut 12v Lead Acid battery charger
this is a auto-cut charger for a Lead acid battery using relay and a 12-0-12 transformer
Created by
Anshuman Tripathy
Tier 5
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Anshuman Tripathy
submitted Auto-Cut 12v Lead Acid battery charger for ship review ago
Anshuman Tripathy
added to the journal ago
added the IN/OUT on the PCB
added the In/out for the battery and the transformer to the silkscreen and also removed the designators since i wanted to have a cleaner look on the pcb
Souptik Samanta 🚀
requested changes for Auto-Cut 12v Lead Acid battery charger ago
Hey can you add connection diagram and add silkscreen to show IN/OUT
Anshuman Tripathy
submitted Auto-Cut 12v Lead Acid battery charger for ship review ago
Anshuman Tripathy
added to the journal ago
Connection Guide
The connections are pretty straight froward the 12-0-12 from the center tap transformer goes to the 3 pin terminal of the PCB
Battery +ve and -ve is connected to the 2 pin terminal on the labelled pins
alexren ⚡🚀
requested changes for Auto-Cut 12v Lead Acid battery charger ago
nice project! can u add some wiring instructions for this? it's not clear how i might connect everything together (esp with a battery)
Anshuman Tripathy
submitted Auto-Cut 12v Lead Acid battery charger for ship review ago
Souptik Samanta 🚀
requested changes for Auto-Cut 12v Lead Acid battery charger ago
Try making a case for it!
Apart from that everything looks good!!
Anshuman Tripathy
added to the journal ago
Made a base plate
So.. I made a small and simple base plate for the board to avoid any shorting of the pins and to just make it more safe. Since in the past ive had accidents when some small pieces of metal shorts the board so.. TO BE SAFE
Anshuman Tripathy
submitted Auto-Cut 12v Lead Acid battery charger for ship review ago
Iamalive 🚀
requested changes for Auto-Cut 12v Lead Acid battery charger ago
Great, the pcb looks correctly wired in your first try :D However you're going to need to make a cad cover for the pcb! Try making it unique, and not just a basic square :thumbsup-dino:
Anshuman Tripathy
submitted Auto-Cut 12v Lead Acid battery charger for ship review ago
Anshuman Tripathy
added to the journal ago
modified a few things
modified the pcb a bit just changed the placement of a of a few parts and researched the parts that i need for the board. the 2 trimpot need will used to set the cutoff and on voltage for the board
Anshuman Tripathy
added to the journal ago
Completed the PCB
Completed routing the PCB and finding the components required most of it were that i alr have with me just needed to add a few more things.
also learned to use the easy eda to kicad tool its amazing so useful for ppl who source there parts from lcsc very handy
Anshuman Tripathy
added to the journal ago
Completed Schematic
So i looked at a few circuits online and designed a circuit referencing them and added some parts which i already had with me and made the schematic.
the basic working principle is that the circuit will be powered using a 15-0-15 transformer and will have a LM317T regulator ic to adjust the cutoff voltage. and when the cutoff voltage will be reached the circuit will turn off automatically via a relay.
Anshuman Tripathy
started Auto-Cut 12v Lead Acid battery charger ago
1/24/2026 7 PM - Completed Schematic
So i looked at a few circuits online and designed a circuit referencing them and added some parts which i already had with me and made the schematic.
the basic working principle is that the circuit will be powered using a 15-0-15 transformer and will have a LM317T regulator ic to adjust the cutoff voltage. and when the cutoff voltage will be reached the circuit will turn off automatically via a relay.
1/24/2026 9 PM - Completed the PCB
Completed routing the PCB and finding the components required most of it were that i alr have with me just needed to add a few more things.
also learned to use the easy eda to kicad tool its amazing so useful for ppl who source there parts from lcsc very handy
1/25/2026 - modified a few things
modified the pcb a bit just changed the placement of a of a few parts and researched the parts that i need for the board. the 2 trimpot need will used to set the cutoff and on voltage for the board
2/12/2026 - Made a base plate
So.. I made a small and simple base plate for the board to avoid any shorting of the pins and to just make it more safe. Since in the past ive had accidents when some small pieces of metal shorts the board so.. TO BE SAFE
3/5/2026 - Connection Guide
The connections are pretty straight froward the 12-0-12 from the center tap transformer goes to the 3 pin terminal of the PCB
Battery +ve and -ve is connected to the 2 pin terminal on the labelled pins
3/22/2026 - added the IN/OUT on the PCB
added the In/out for the battery and the transformer to the silkscreen and also removed the designators since i wanted to have a cleaner look on the pcb