Power device from USB? - Electronic Circuits Projects Diagrams Free

tim_l_012 · 13th June 2003, 08:36 AM

Hi All,

I have decided that my next project will be to find a new way of supplying power to my networking switch.

According to the output specs on the AC power adaptor, it outputs:
7.5V === 1A 7.5VA

Input will be from a USB socket on a computer, which from memory, is 5V and 500mA. (Someone correct me if I'm wrong here...)

So I need to go from:
5V to 7.5V
500mA to 1000mA (1A)

How would I build a converter for this, and what components would I need. If a small diagram and explanation could also be provided, it would help me as I am only a 'newbie' with electronics.

Thanks in advance,

Sebi · 13th June 2003, 11:31 AM

You can't suck more current from USB then 500mA (5V)
When You apply a step-up converter, it can't enhance the USB original power capability. For 7.5V 1A need 5V with 1.6A.

tim_l_012 · 13th June 2003, 02:36 PM

oh well it was good while it lasted...

my next mod isn't 100% related to electronics, but...

I need help with the wiring config of a standard phone line (Australia)
I want to hook a PC headset up to a phone line, so I don't have to hold the massive headset :P

If anyone has any ideas/queries, please reply and will go into more detail.

Thanks in advance,

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13th June 2003, 08:36 AM	(permalink)
tim_l_012	Power device from USB? Hi All, I have decided that my next project will be to find a new way of supplying power to my networking switch. According to the output specs on the AC power adaptor, it outputs: 7.5V === 1A 7.5VA Input will be from a USB socket on a computer, which from memory, is 5V and 500mA. (Someone correct me if I'm wrong here...) So I need to go from: 5V to 7.5V 500mA to 1000mA (1A) How would I build a converter for this, and what components would I need. If a small diagram and explanation could also be provided, it would help me as I am only a 'newbie' with electronics. Thanks in advance, __________________ Tim.

13th June 2003, 11:31 AM	(permalink)
Sebi	You can't suck more current from USB then 500mA (5V) When You apply a step-up converter, it can't enhance the USB original power capability. For 7.5V 1A need 5V with 1.6A.

13th June 2003, 02:36 PM	(permalink)
tim_l_012	oh well it was good while it lasted... my next mod isn't 100% related to electronics, but... I need help with the wiring config of a standard phone line (Australia) I want to hook a PC headset up to a phone line, so I don't have to hold the massive headset :P If anyone has any ideas/queries, please reply and will go into more detail. Thanks in advance, __________________ Tim.