Ok if you can't use a USB lead for power you could use the 12v from any PC Molex peripheral connector but the onboard voltage regulator will have...
1) You'd need a transistor to make the switch from 5v PWM to 12V to power your LEDs and it would have to be able to sink enough current for the...
It takes 12v and uses a DC-DC converter to supply the rest of the voltages it needs internally.
Only USB LED strips will be 5v. A 12v LED strip needs at least 10v. A discrete LED would need 3.5v@20mA.
A blue LED is 3.4v and a red LED is 1.8v. The extra 1.6v has to go somewhere and in this case it'll go to the LED and over drive it. Of course...
In the thread below (on OCUK) I discuss and show a few different ways of powering LEDs including using a wall mains adaptor. LEDs are low voltage...
The forward voltage of the LED will vary depending on which colour you want. Typically they are 1.8v for Red on up to 3-3.5v for White or Blue....
You can get flat top round LEDs in 3mm amd 5mm package. The light from these is wide angle and won't seem as bright. You can also add a resistor...
You should probably just buy a 12v and 5v power supply. Something like this perhaps......
1 x soldering iron 1 x a bit of solder Job done. Or somehow stuff the wires back in and squash down with a pair of needle pliers. I'd want to...
Unless you have a always high current USB port or can find a way to negotiate with the USB controller you'll be stuck with 100mA of current from...
It would have to be a seriously fast fan at 12v to use more than 500mA at 5v. Current draw drops with PC fans in an almost linear fashion as you...
Ideally you'd have a bit more voltage headroom to charge four cells so the 5v of a USB connection would not be sufficient for four cells in...
You can get low self discharge NiMH such as Sanyo Eneloop. A 4.8v NiMH will be 4 normal cells in series, which will of course show over 5v when...
Well it's a 5v DC fan so make a guess. If you wire it backwards it won't turn. Maybe if you are lucky the wiring will follow convention of 0v, 5v,...
It's too convenient that 12v less 3.3v happens to be 8.7v and 5v less 3.3v happens to be 1.7v. Either you've measured wrong or those two cables...
Sounds like the other two 'grounds' are in fact +3.3v. You should be able to use the same 0v ground for both +12v and the +5v provided the cable...
The PSU doesn't need to be in the same case as your pc but will obviously need to be connected to it by the cables. You could add extensions to...
^^ That's about the easiest and cheapest way. Depending on where you make the cut you may be able to pull the braid (if it has braid) back far...
Is this based on an actual reading of the current drawn at 12v or just off the label as they don't always match. In addition as you drop the...
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