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Mod keyboard to use usb power - Page 2

post #11 of 20
Thread Starter 
at this very moment i do not have the money, and wont do for a while
post #12 of 20
Zeners are great. You don't need an EE for those guys but watch the maximum wattage they can handle.

And keep an eye on it after you plug it in.

Edited by ripster - 2/20/11 at 4:59pm
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post #13 of 20
Thread Starter 
Just trying to find the right zener, i found one with the output voltage of 3v but doesnt say input
post #14 of 20
Quote:
Originally Posted by Rittzy View Post
Just trying to find the right zener, i found one with the output voltage of 3v but doesnt say input
Zeners will take any input voltage and convert it to their output, as long as it isn't excessively high.
post #15 of 20
You could also try a voltage regulator, just get one that outputs 3.3 volts, you can just put in 5 volts on the other side. I don't think you need any other components.
http://cgi.ebay.ca/Lot-5-L78L33ACZ-7...item4aa0405947
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post #16 of 20
Thread Starter 
dont you have to put a resistor on the third pin and connect it to a negative rail though?
post #17 of 20
You could wire directly into the psu's 3.3v line although a would not recommend that as it is not current limited and may burn out the keyboard.

Or you can get a 1.5v torch light bulb and put it in serial with the positive 5v usb line.

usb is 5v @ 1A
inline with 1.5v 300mA bulb gives

3.5v @ 700ma

You could try with a 2v bulb if you can find one but 1.5v bulbs are more common.
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post #18 of 20
couldn't you just take the easier route and use rechargeable batteries...
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post #19 of 20
Quote:
Originally Posted by Xenderwind View Post
couldn't you just take the easier route and use rechargeable batteries...
That's what I always did with wireless keyboards. Costs lk $10 to get a 4pack + recharger, and you can use them pretty much infinitely.
/hwaw
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/hwaw
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Intel Core i7 3770k @ 4.3ghz 1.160v ASRock Z77 Extreme6 Gigabyte R9 290 Windforce Sapphire R9 290 
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2x4gb Samsung RAM @ 2000mhz 9-10-9-28 1.425v OCZ Vertex 4 Hitacho Deskstar Crucial M550 
CoolingCoolingCoolingOS
Corsair H80 (CPU) Thermalright Spitfire (GPU) Gelid Icy Vision (GPU) Windows 7 Ultimate 64-bit 
MonitorMonitorKeyboardPower
BENQ GW2450 Asus PB278Q Cooler Master Quickfire Rapid Seasonic 750w  
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post #20 of 20

Yeah, but HOW boring.

Check this mod. Incoming IM message notification. LEDs powered through USB with a simple script to blink them.


Edited by ripster - 2/23/11 at 11:14pm
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My System
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