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Rockbox mail archiveSubject: Re: Too high an mA rating CAN mean too high a voltage!!!Re: Too high an mA rating CAN mean too high a voltage!!!
From: Glenn Ervin at Home <GlennErvin_at_cableone.net>
Date: Wed, 17 Mar 2004 18:34:11 -0600 I think that the way to describe this is that the voltage and the amperage are inversely proportional to each other for a given supply of energy. ----- Original Message ----- From: "Fred Maxwell" <rockbox_at_anti-spam.org> To: "Rockbox development" <rockbox_at_cool.haxx.se> Sent: Tuesday, March 16, 2004 5:29 PM Subject: Too high an mA rating CAN mean too high a voltage!!! BlueChip wrote: > At 21:47 16/03/04, you wrote: > >> I used the standard 9V Voltage. The Adapter is capable of 800mA, but the >> Archos only need 500mA - could this be a problem? > > > No, that problem is the other way around ...if the player needs more > current than the adaptor can supply, then the adaptor will melt ...The > adaptor will only kill the player if the voltage is too high. I feel like I've beaten this point to death, but I don't want an unanswered post to result in someone blowing up their Archos (or any other piece of valuable electronics). The 9v, 600mA wall wart that came with my Archos measures 14.5v with nothing attached to it. That's about 61% above the rated 9v at 600mA. If I had a 600mA load attached to it, I bet that it would be close to 9v out. The voltage and amperage are related in unregulated power supplies. When you increase the load, you decrease the voltage. If you buy a 9v at 1000mA adapter to feed your Archos, you are almost guaranteed to be feeding it far more than 9v. Regards, Fred Maxwell _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2004-03-18 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |