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Author Topic: USB pin outs for 5v?  (Read 1243 times)

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Offline ArchivalAudio

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USB pin outs for 5v?
« on: January 30, 2014, 02:45:54 AM »
So I have been able to find some info on USB pinouts or pin assignments.

generally it appears that Pins 1 and 4 are the primary power pins.
1 is red or + 5v
4 is black or Ground

making this assumption I'd like to make a simple USB  5v power cable.

It's likely not critical voltage  as I am attempting to wire some LED xmas type light strings that are normally powered by 4.5 v or 3 AA batteries.

You ask why, for festivals and for camping in my 8x10' teardrop trailer with 12v power outlets. It's already got a number of LED lights but hey are really F-ing bright and I'm looking for a more festive subdued option and an alternative to using AA or NIMH AA's
I've got plenty of 12v power while camping.

Also I may use this set up with a stroller and a  LI-Ion USB back up battery for late night with my 3.5 year old son so we can cruise in safety... that's another story.

Wondering if anyone has thoughts on a 4.5v LED string powered with a 5v usb plug instead. Seems to me the slight power difference would be fine.

Thoughts or input is welcome!

--Ian
« Last Edit: January 30, 2014, 11:50:07 PM by ArchivalAudio »
~ Archival Audio ~
Archiving Worthy Music
since 1986 & digitally since 1995

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Offline ArchivalAudio

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Re: USB pin outs for 5v?
« Reply #1 on: January 30, 2014, 09:26:35 PM »
Jon,
thanks!
 Would you advise adding a resistor or two inline, usually when powering LEDs this is what I have done as it was reccommended to slow the current drain.

If so can us perhaps suggest a resistance?

--Ian
~ Archival Audio ~
Archiving Worthy Music
since 1986 & digitally since 1995

https://www.facebook.com/ArchivalAudio/

Main Mics: Milab VM-44 Links • Milab DC-196's (Matched  Pair)  • Line Audio CM3's
PreAmps:  Naiant LittleBox • Naiant [Milab VM44] TinyBox • Naiant PIPsqueak
Recorders: MixPre 10T •  Tascam DR-100 mkIII • Sony M-10 

macMini 3Ghz i7 16GB Ram 500GB SSD • MOTU UltraLite
Naiant MSH-2's •   TOA K1's • Beyer TG 153c's •  AT 853 (4.7kmod darktrain) • Countryman B3's (1 k mod)  + other assorted mics

Offline ArchivalAudio

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Re: USB pin outs for 5v?
« Reply #2 on: January 31, 2014, 02:09:19 AM »
Got it , thanks.
I'll try and figure out if and what resistor(s) it may need.

~ Archival Audio ~
Archiving Worthy Music
since 1986 & digitally since 1995

https://www.facebook.com/ArchivalAudio/

Main Mics: Milab VM-44 Links • Milab DC-196's (Matched  Pair)  • Line Audio CM3's
PreAmps:  Naiant LittleBox • Naiant [Milab VM44] TinyBox • Naiant PIPsqueak
Recorders: MixPre 10T •  Tascam DR-100 mkIII • Sony M-10 

macMini 3Ghz i7 16GB Ram 500GB SSD • MOTU UltraLite
Naiant MSH-2's •   TOA K1's • Beyer TG 153c's •  AT 853 (4.7kmod darktrain) • Countryman B3's (1 k mod)  + other assorted mics

 

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