Re: Using Voltage Regulator for current limiting - John Fileds ?

On Wed, 11 Jan 2006 00:02:25 +0800, William A. Bong wrote:

> I think that it was John Fields that posted a circuit using a voltage
> regulator IC such as the 7812 as a current limiting device - John or anyone
> else that could help out with this please repost it - I searched but it's
> obviously no longer on my server.
>
> I was thinking of using this as a current limiter to build a USB to Nokia
> phone charger - I have
> the hardware and connected it up straight, but it trips the power to my
> notebook USB port requiring a reboot to reset the USB.
>
> All advice and most welcome.
>
> Bill.

A current limited regulator isn't what you're looking for here - all that
will do is make the power supply to your device droop, and it won't
operate properly. You need either a USB with a beefier supply, or an
auxiliary power supply, like a wall wart.

Good Luck!
Rich


.

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