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Subject: Re: Charge from the USB or not

Re: Charge from the USB or not

From: Andrew Jamieson <>
Date: Sat, 25 Jan 2003 08:42:32 +1100

I will do the schematics for my USB charger this weekend .... I've been a
bit slack. You don't have to worry about the USB connection: you can either
not connect the USB plug, or (as I did) provide a switch on the 5V line
(Vbus) into the Archos. Without Vbus, the USB section of the Archos will
not be 'switched on', so you can leave the USB plug connected at all times.
Illustratively (if you'll forgive my ASCII circuit);

| Archos Power Port
         | Vbus ----------------------|Charger|-------|Switch|-----------
  PC | D+ ------------------------------------------------------------
| Archos USB Port
 USB | D- ------------------------------------------------------------
GND ------------------------------------------------------------ |

I'm quite happy with my charger, I never use my plug pack anymore - my
Archos just stays connected to my PC at home or work.


----- Original Message -----
From: "Joaquim Carvalho" <>
To: <>
Sent: Saturday, January 25, 2003 2:26 AM
Subject: Charge from the USB or not

> I no longer think it's a good idea to mod the archos for
> usb charging since it is locked in USB mode when the plug
> is connected, but a simple Schotky diode to power the
> device from USB might a good idea.
> USB voltage is 5V, less the diode dropout at 300mA we have
> around 4.8V which is around the nominal voltage for 4 NI-MH
> batteries - not all current would come from USB but some
> some battery power would be saved...
> It might enable us to go to a friend's house for a few hours
> MP3 up/download without running out of batteries.
Received on 2003-01-24

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