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llama · 1st Jun 2020, 3:53 pm

I've got exactly what you describe, plus a few extras. Yes, centre pin positive.
My version plugs into an in-line female cigar-lighter socket (off ebay) which in turn is wired to the 12 V wires of an HDD power plug (old style, not SATA) and the 4-pin power socket to that is wired to a USB-to-12v adaptor, also off ebay. This is all to give me the most flexibility in how I power stuff, and what stuff.
Graham

1st Jun 2020, 3:53 pm	#4
llama Octode Join Date: Jun 2006 Location: St Osyth, Nr Clacton, Essex, UK. Posts: 1,482	Re: Cigar lighter socket polarity? I've got exactly what you describe, plus a few extras. Yes, centre pin positive. My version plugs into an in-line female cigar-lighter socket (off ebay) which in turn is wired to the 12 V wires of an HDD power plug (old style, not SATA) and the 4-pin power socket to that is wired to a USB-to-12v adaptor, also off ebay. This is all to give me the most flexibility in how I power stuff, and what stuff. Graham __________________ Half my stuff is junk - trouble is, I don't know which half!