Hi,
I'm new to this stuff, so will apologise in advance, if needed.
I am wanting to power my USB modem (voyager 105) which I use for work as a service engineer to check for a DSL connection. Normally, I would connect this to my laptop to power the modem, but what I am looking for is the ability to do away with the laptop at times, and gain the power needed from a more convenient source.
I saw the homebrew USB chargers that you can make, so bought some of these parts from my local electronics store to use with a 9v battery.
(1) I got a 5v voltage regulator (the guy in the shop recommended the 2amp one, instead of getting the 0.5A one I planned on getting) He said that the bigger amp will allow the reg to run cooler and not thermal cut-out, but to ensure the device doesn't want to draw more than the 0.5A rating of USB or it could fry the modem.....is this right?
(2) He suggested using AA batteries to provide the 9v, instead of an actual
9v (PP3) battery, for longer life, and that a 9v PP3 battery will not last very long at all - how long might both examples last?
(3) Will the device, BT voyager USB modem have a voltage tollerance, ie. could I just strap the 9v battery to a butchered USB lead, or will 9v kill the modem?
(4) Or if I used, say, 4 AA batteries giving 6v, and strapped that to the modem would just 1 volt over be OK, or would this still fry the modem?
What the important bit, the volts or the amps, is it the amps that do the frying of devices?
I wanted this to be as easy and as straight forward as possible, I don't want to get to involved or build the best homebrew electronic, semi-conducted device known to man.
I want the easiest way to power my USB modem from batteries, that will last the longest, without frying the modem instantly (life shortening is acceptable!)
Thank you in advance for any help
Ron.
I'm new to this stuff, so will apologise in advance, if needed.
I am wanting to power my USB modem (voyager 105) which I use for work as a service engineer to check for a DSL connection. Normally, I would connect this to my laptop to power the modem, but what I am looking for is the ability to do away with the laptop at times, and gain the power needed from a more convenient source.
I saw the homebrew USB chargers that you can make, so bought some of these parts from my local electronics store to use with a 9v battery.
(1) I got a 5v voltage regulator (the guy in the shop recommended the 2amp one, instead of getting the 0.5A one I planned on getting) He said that the bigger amp will allow the reg to run cooler and not thermal cut-out, but to ensure the device doesn't want to draw more than the 0.5A rating of USB or it could fry the modem.....is this right?
(2) He suggested using AA batteries to provide the 9v, instead of an actual
9v (PP3) battery, for longer life, and that a 9v PP3 battery will not last very long at all - how long might both examples last?
(3) Will the device, BT voyager USB modem have a voltage tollerance, ie. could I just strap the 9v battery to a butchered USB lead, or will 9v kill the modem?
(4) Or if I used, say, 4 AA batteries giving 6v, and strapped that to the modem would just 1 volt over be OK, or would this still fry the modem?
What the important bit, the volts or the amps, is it the amps that do the frying of devices?
I wanted this to be as easy and as straight forward as possible, I don't want to get to involved or build the best homebrew electronic, semi-conducted device known to man.
I want the easiest way to power my USB modem from batteries, that will last the longest, without frying the modem instantly (life shortening is acceptable!)
Thank you in advance for any help
Ron.