Somehow this strikes me a a great way to blow up a phone. It may work but why not use a switch mode supply as has been suggested?
Car cigarette lighter to 5V USB switch mode supplies are readily available for a couple of dollars.
https://www.ebay.com.au/itm/Cheap-U...hash=item2ef6b9c957:m:mHtYQkXu_DCoq1FtwnjmMPA
Or use a 3Amp buck converter board like...
https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=5V+3A+buck&_sacat=0
Smaller and a lot less heat and probably cheaper as there is no extra heat sinking needed.
Car cigarette lighter to 5V USB switch mode supplies are readily available for a couple of dollars.
https://www.ebay.com.au/itm/Cheap-U...hash=item2ef6b9c957:m:mHtYQkXu_DCoq1FtwnjmMPA
Or use a 3Amp buck converter board like...
https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=5V+3A+buck&_sacat=0
Smaller and a lot less heat and probably cheaper as there is no extra heat sinking needed.
Last edited: