[OZAPRS] [aprssig] Can I run a GPS18 from the +5v on the USBcable ?

Darryl Smith Darryl at radio-active.net.au
Sat Apr 29 21:38:53 CDT 2006

USB will supply a maximum of 100 mA per port at 5V to a device. Commonly
ports can supply five units of power to a device, or 500 mA to a port, but
this will be dependant on what else is plugged in.

Intelligent devices may communicate with the controller to discuss power
requirements and shut down if required. Since you are not worrying about
using the USB power control I would say that you can pull about 500 mA
commonly from the port


Darryl Smith, VK2TDS   POBox 169 Ingleburn NSW 2565 Australia
Mobile Number 0412 929 634 [+61 4 12 929 634 Int] - 02 9618 6459
www.radio-active.net.au/blog/ - www.radio-active.net.au/web/tracking/

-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Jason Winningham
Sent: Saturday, 29 April 2006 10:17 PM
To: vk4tec at tech-software.net; TAPR APRS Mailing List
Cc: ozaprs
Subject: Re: [OZAPRS] [aprssig] Can I run a GPS18 from the +5v on the
USBcable ?

On Apr 29, 2006, at 6:48 AM, Andrew Rich wrote:

> Can I run a GPS18 from the +5v on the USB cable ?

Assuming it's an 18LVC or an 18PC with the regulator (inside cig  
lighter plug) chopped off, yes.

> What is USB supposed to be able to deliver in current ?

Max 500mA per device, IIRC.  It shouldn't have any trouble with the  
18.  Another data point is the 18USB, which runs off USB power (too  
bad that one won't NMEA).


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