Ac and dc led drivers?

Can I power an AC LED driver with DC voltage, I understand the driver controls voltage  1watt , the driver was rated 85 - 265 volt ac input but the seller had written 12 volt with grease pen across the printed label. This light works fine

Asked by dsr. 5 years ago

XP Drivers

I bought a Compaq Presario F700 Notebook PC but it came with vista. i gave it a try but did not like it. so i bought windows xp PRO i installed and there wasn't any problems. but i need some drivers which i could not find. if you can help me please do so. in the picture you can see that i am missing some drivers but i cant seem to find them if you need more information please feel free to contact me.

Posted by chrischavez 9 years ago

Does an LED driver rated @ 6v -12v hold/keep a source voltage of 8.4v to 6v or just maintain it between 6v - 12v

I should preface my inquiry with an admission of possessing very limited electronics knowledge. but I am somewhat familiar with battery voltages & amps. I have several Luminus SST-50 & SST-90 LED emitters. I have found that to achieve the full lumen potential these emitters must be driven beyond Luninus's stated typical vf of 3.2 volts. I do not exceed 6vf. I am aware that current is a major factor in the performance of these lights, but when using 5-6amps or the max of 9amps (SST-90)I notice little difference in the brilliance of the light. However, when altering the vf from 3.2v or 4.5v to 6v the difference is amazing. When using 5 X NIMH batteries (= 6volts/4.5amps) with an SST-90 the lumens are high. When I use 4 X NIMH bat @ 4.8 volts/4.5amps, there is about a 25% reduction in light production. With my limited electronics info.I assumed the voltage was the key force here. Or is there something about the volt/current relationships that I need to know? My ? actually concerns the drivers that I have. They are rated @ 6v - 12 v. Do you know if a driver, with these specs, regulates/holds the vf @ 6 volts when the source voltage is greater than 6 volts or does it just maintain the voltage within the range of 6v - 12v. Using 2 X 4.2v LIon batteries, connected to the driver, gives an 8,4v the volt meter reading. Such a voltage will destroy the emitters. I expected a reading of 6vf (@ the driver leads). If you are able to answer my question, one I would be profoundly grateful, 2 please be as detailed/specific/simple as possible. Thank you very much cgc210

Asked by cgc210 5 years ago

Driver for arduino on Windows 7?

I have recently had to wipe the hard drive of my computer due to a virus. Consequently I had to re install all of my arduino stuff. I got my IDE arduino 0022, but when I plugged in my board to get the driver again I ran into some problems. First off it came up in other devices on my control panel, and when I tried to update my driver, the ArduinoUno.inf did not come up in the driver folder. I moved the file to its own folder, so that it would actually come up when I tried to update the driver, but even when I selected the file I knew for absolute certain was correct the computer said that there was no driver in that file for my device. What is going on and what can I do?

Asked by Higgs Boson 5 years ago

need instructions on how to load clean copy of windows 7 on a compact laptop?

I am trying to install windows 7 on a compact Presario CQ56-115DX notebook,i keep getting a message that says some required cd or dvd drivers are missing how or where do I find the missing drivers and load them so I can finish installing an os on my computer

Asked by travisleejensen 3 years ago

driver and update problem with windows 7

I've had my computer since last April. it has Windows 7 home premium sp1. the problem started about 6 months ago. whenever i plug in any new usb device, it fails to install any drivers. hardware installed before this started still works perfectly, only new stuff won't work. and the attached picture is what it looks like when i open windows update. both problems started around the same time, so i assume its the same problem, and i am just completely out of ideas as to what it could be. any help is greatly appreciated.

Asked by mr.mountaineer 4 years ago

Acer Aspire 1 drivers? Answered

Hi! I have an Acer Aspire 1.  I had truecrypt on it encrypting the whole harddrive... had some problems... etc. etc. etc.  I ended up just wiping the drive and upgrading from W7 starter to W7 pro.  Now I don't have a valid driver for my ethernet, WiFi, or graphics.  I tried to find the drivers on Acer's website, and ended up talking to a tech rep who of course didn't really know anything.  He told me that my computer can't run W7 pro... which obviously it can since everything else works.  He also told me that Acer will not supply the driver for my computer.  The only option he gave me is to buy recovery media from them and restore it to W7 starter.  I'm not willing to settle for that even if I have to live with it the way it is.  Just thought I would ask if anyone else has had this problem, and if so how they fixed it?  (And yes, I already Googled it a couple different times... nothing on Google worked.) Thanks in advance!  :)

Asked by thegeeke 6 years ago

DIY Light pen- how tosend absolute position & pressure to PC/software? Answered

I'm planning on converting an old CRT monitor to use a light pen. I have the hardware side of things largely figured out, so I can get an absolute position of the pen on the screen and a pressure value, but I don't know the best way to go about getting those values into the PC or software. Ideally, I'd like to use R-S232 or PS/2 to connect to the PC, in both of which the cursor could be homed by the hardware and then moved to an absolute position by keeping track of the relative positions sent, all using the standard drivers, albeit without a pressure input. However, I have found this specification for synaptics touchpads, which provides information on using their driver to send more data (including pressure) over the PS/2 or serial connection, but I can't tell if the absolute mode is intended to work as I want it to, or if is simply to catch and correct any bad position reports. I also doubt this pressure input will be recognised or used by any software. The only alternative I can see is USB, which looks horrible to try and implement, and still doesn't look as though it will support a pressure input with the standard drivers. Ideally I'd like to try to emulate one of wacoms touchscreens, as this would allow me to use their drivers, allowing it to be compatible with most software, though so far I have been unable to find any information on this, and don't expect that I will be able to get it without borrowing a tablet and watching the communications with the PC. Which interface would be best, and does anyone have any suggestions regarding drivers? Thanks in advance for any help.

Asked by The Skinnerz 4 years ago

XP won't accept virtualbox internet drivers

Hello, I am trying to get the VHD from xp mode to work on virtualbox with internet. I can boot into the OS fine. I tried 4 connection types at once. The screen shot pretty much explains it. 

Asked by jbaker22 3 years ago

Reinstalling GPS Drivers During Hardboot on o2 XDA Zest phone to out of box factory settings

Hi, I use my old o2 xda zest phone evey day as it has an usefull inbulit gps system that i use for navigating the roads that i'm unfamiliar with.  I feel the gps drivers may have become corrupt as the phone tends freeze for a few momentst until a strong satellite signal is received.  I want to return the phone back to its original just out of box factory setting by hardbooting the phone. Before i begin  I want to ask!  If i hardboot my windows mobile xda zest phone are the drivers for the inbult gps receiver automatically installed during the hardboot or will i need to down load them from the web later to install them?.  Im asking since i dont want to perform a full hardboot to discover my gps drivers on my phone have been lost forever !  Have you hardbooted your xda phonein the past.  please let me know. Thanks for replies in advance.

Posted by selectauto 6 years ago

Problems with Acer EXTENSA 4420 : NO Webcam, Bluetooth & Modem Audio HD Device AFTER re-installing Vista Home Basic

Webcam, even I have an Acer Extensa 4420 Re-install Vsta Home Basic, can't find the Crystal Eyeafter Iinstall Acer driver. Also can't install Modem HD Audio Device. Please Help!

Asked by 8 years ago

have i got 1 good driver or 3 bad ones

Hi all, nice to be here I have just finished building my first cnc router and about to start actually doing something with it, during my build I somehow managed to blow up 2 grbl boards and 6 drivers, hey note to myself, don't connect voltages when tired late at night also I have a problem, I think, thanks to YouTube I found how to set the voltage using the trimmer pots on the driver boards, I set all 4 drivers initially to 0.75 volt and it all works and tests fine, apart from having to buy 2 more driver boards when the trim pots fell off that is apart from one of the stepper drivers powers one motor (Y axis) and when it finishes working it goes absolutely solid locked up and sounds like it is groaning, the other 3 are firm but not locked up I tried increasing the voltage on the 3 looser stepper motors to 1.0 volt and it didn't seem to make a lot of difference, but to get the solid stepper driver down to the same stiffness I have had to drop the voltage down to 0.4 volt and it did stop groaning and loosened a bit I swapped over the motors, same result, moved the driver to another spot on the grbl board exactly the same effect on a different motor, so it looks to me like it is the DRV8825 driver board is this a case of I have 1 bad board and 3 good boards? or 1 good board and 3 bad boards ? any help would be more than welcome info on my cnc build and components below basically the cnc has a bed of 900mm x 900mm and is pure self build made up of parts found laying around my workshop, rails bearings lead screws etc, and I added in a new Arduino uno (of which I am novice) and a new GRBL board and ended up using DRV8825 drivers, stepper motors are used (eBay) 4 x identical minebea 23LM-C343-14V wired from 6 wire down to 4 wire with pairs being red & yellow and pair 2 being blue & orange, which I believe is correct LINK TO STEPPER MOTOR SPEC SHEET please correct me if I have made a mistake I have used links to set all drivers to 1/32 micro stepping, also set the mm rate so it is exact at 500mm travel, and set max speed at a sensible 400mm per minute as I am not really expecting supersonic speed and all is nice and quiet, nothing straining I have paired 2 of the stepper motors via the grbl to drive the X axis and used the clone spare on the GRBL to make that work, which it does marvellous The CNC structure does need strengthening up as mostly built on ply at the moment, but everything works as expected, the spindle is a nice almost new RotaZip high speed tool that I bought new about 4 years ago and only used it on one job so keeping stuff does come in handy even if wifey says it doesn't Look forward to sharing info on here as I learn more

Posted by IanT107 3 months ago

Testing a 3 watt LED? Answered

I recently purchased 13- 3 watt LED's. I'm trying to establish a high out-put LED light. I also purchased a LED Driver Transformer 48 Watt 120 Volt to 12v DC 4 Amp. First I would like to test each LED using the same divider. I'm thinking that if I create a voltage divider two 330 ohms to limit the current and reduce the voltage to about 6 volts that would allow me to test with the driver that I purchased. Secondly, will this driver be enough to drive all my LED's and would I have to reduce the voltage down too since it appears to push out enough wattage and amperage for the total number LED's I'm putting together? I'm building my circuit based on this video. Link to website data of 3 Watt LED. Assistance would be greatly appreciated. Regards, 

Asked by lancruz 6 years ago

Help With Toshiba Notebook Drivers? Answered

Hi I recently reloaded a Toshiba Satellite A70-S249 Notebook Computer. I reloaded it with the Windows disk but I am having trouble with finding the hardware drivers for it. I need drivers for most the hardware including the: USB Video Card  Modem Sound Card I have looked all over the internet and cannot find the drivers. I was hoping somebody could post a link to a website were I could download the drivers. I want the actual drivers not one of these programs that searches the internet and finds the correct drivers. Thanks.

Asked by nurdee1 6 years ago

Help! First time using Arduino on Mac- Serial Port not showing up?!?

After installing the Driver that came with the install software...I still cant see the proper serial port still. What am I doing wrong?

Asked by techiekat 6 years ago

Help uploading a disk to a usb drive?

I have bought a usb wifi adapter for my raspberry pi. The problem is that the drivers that come with it are on a disk. I have tryed a few ways of uploading the disk to a usb but they have all failed. I have had the usb to wifi running on my windows 7 computer (the raspberry pi is linux). I have a spare usb that I dont care about to transfer data. I have also tryed to get drivers online but these have not worked. Any ideas? Thanks, David.

Asked by David97 5 years ago

what should I do if my dell lapstop audio sound has static? Answered

It's a dell Inspiron 1501 laptop. the audio from the laptop has like a crackel static sound when using either the internal speakers,amplified speakers or headfones. when I play music ,video,online videos like in youtube I can hear it too. what could it be sound hardware? drivers? anyone had this problem?

Asked by PitStoP 8 years ago

How do I have DirectX 11? Answered

So, somehow my computer running Vista & a 8500 GT thinks it has DirectX 11, and I'm trying to figure out how that works.  It's even an nVidia card, they don't even have cards or drivers for Dx11 out.  I just ordered a Radeon HD 5770 for the Dx11 support and I'm feeling a bit cheated (not a big ATI fan). It'd sure be peachy if I could somehow run Dx11 games on my nVidia card (not that a 8500 GT could handle it, but perhaps a GTX 260).  It's probably just some sort of wacky glitch with the frontend and I don't ''really'' have Dx11, but you never know...  Anywho, anyone have an inkling what's up with this?

Asked by RelaxedSoup 8 years ago

why does my computer have to instal the software for my mouse every time i plug it in?

As the question says i would like to know why my laptop always has to install the software everytime i plug it in and if there's a way to just keep it so it will always work

Asked by coldpsyco91 7 years ago

My speakers won't give sound (Realtek HD Audio)?

To start off, I'll tell how it all happened. First, almost 3 months ago I bought a PCI Wireless card from newegg, it came in a week later and it was defective. I returned it for a new one and got it another two weeks later (Very slow shipping). It was working, but when I installed what was on the disk it came with, my HD Audio Manager went wacky and said I was plugging in and out audio devices. I just clicked OK on all of them. So I got good speeds but I realized I hadn't any audio coming from my speakers. The realtek HD audio was set to default playback device and both ports on the audio jack were securely in. It simply wouldn't work. A restart didn't fix it either. So I uninstalled and reinstalled the drivers for the PCI Wireless card a couple of times, restarting time after time just going through troubleshooting processes in hope that one would fix it. So during the process, after the first time of uninstalling I found the card defective again only giving 0.8Mb/s download speed just as the first defective card. Over the whole convoluted process I hadn't fixed my speakers, my mouse drivers broke so I had to put it into a different port, and I have another defective PCI wireless card. So my question is, how would I fix my speakers? The speakers are in my monitor and what it's usually named is Realtek HD Audio or something but now it's named High Definition Audio Device. Are there any fixes I can try? Or is more information needed? Thanks!

Asked by knexpert1700 4 years ago

Does anyone know where I can find an Ubuntu compatible wireless usb adapter?

To be more specific, does anyone know where I can get a cheap, compact, wireless usb adapter that is bundled with drivers for Ubuntu and maybe even Windows too? A link would be great! Thanks! -Shadow Ops

Asked by Arbitror 8 years ago

How should I adjust my computer's mouse sensitivity/speed?

I have a razer deathadder mouse and was wondering, what should I use to adjust sensitivity/ speed of my mouse? Should I adjust the sensitivity in windows xp control panel, the razer drivers or in-game settings? And what should I set the ones I shouldn't adjust to? To the middle setting, the highest, or the lowest setting? Thanks

Asked by tudgeanator 8 years ago

How can I 'harvest' the cameras from broken cell phones?

I have about 6 old phones, all with cameras - so not that old. They are not used because not reliable, or unknown reasons. I keep them around because I want to do something with them. Can I access the cameras, with some kinda of usb adaptor + some drivers? Maybe make webcams out of them?4 of the phones are razors btw.Thanks - really looking forward to your replies.

Asked by blakeredfield 9 years ago

4-DCMotor Driver?

Please help me to connect 4-DC-Motor-Driver-Module to arduino thank you

Asked by alisoud 9 months ago

4-DCMotor Driver

Please help me to connect 4-DC-Motor-Driver-Module to arduino thank you

Posted by alisoud 11 months ago

Power Supply and Driver? Answered

I've seen alot of the projects that have a power supply and a driver?  What's the difference between the two and why would you need both?

Asked by lford4 6 years ago

xp modem driver for acer aspire 5720

I downgraded this laptop from Vista to XP. I have gotten all the drivers except the modem driver. I have downloaded every driver possible from the acer website with no luck if anyone has done this conversion successfully I would appreciate know what modem driver you used thanks

Posted by pcbuilder48 9 years ago

2N3055 Flyback driver

2N3055 Flyback driver really need resistor to work?

Asked by james34602 5 years ago

3W LED Driver

I Want to design a 3W led driver with 9V dc and 350 mA ouput.

Posted by gaurravi11 4 years ago

Ubuntu 14.04 / Kubuntu 14.04 graphics issue?

This must be just me, I cannot find any info on this weird problem: After a fresh install of ubuntu 14.04 LTS on my old Compaq Presario C700 (w/ 2GB RAM and a new 120GB xbox HHD (2007 vintage)), every time I open firefox or google chrome, the screen will go completely blank after a few seconds and the only way to make the screen come back on is to close the laptop and open it again. That makes it go into sleep mode then I can wake it up again. However, unity window manager appeared to have crashed and window borders and decorations are gone,along with the sidebar and everything except whatever windows were open at the time. The screen also has redrawing issues (things get drawn but do not refresh and go away, leer around after, say, a windows is closed.), and going into the CLI and running the command "unity" and "compiz" to restart it does not fix it. After updating everything, I still had that issue, so decided that ubuntu+unity wasn't worth messing around with anymore since I thought it was a unity thing not running smoothly on intel GMA (although 12.04, 12.10, 13.04, 13.10, and 14.04 worked perfectly fine previously! I had to reinstall ubuntu because I screwed up all the partitions on the drive when I did a HHD transplant. (200MB for linux, 110GB unallocated space, little bit of swap.)). Anyway I decided to try kubuntu w/ much lighter KDE, and was pleased to find out IT HAD THE SAME PROBLEM! X-( since it works perfectly fine w/o firefox running, I tried to disable hardware acceleration, nope, didn't work. I tried to use google chrome, nope. didn't work. All that did work was chromium, but I prefer chrome over chromium for... reasons. Chrome actually was working fine until I changed the theme of it and enabled the  This kind of reminds me of all the issues I had with Nvidia drivers vs linux... I am a bit afraid to screw around with the Xorg stuff, thats how I bricked linux in the long-forgotten past w/ Nvidia graphics. I will do whatever is necessary if anyone has suggestions.

Asked by -max- 3 years ago

3W LED driver?

3W LEd driver with 9V dc and 350 mA output runs on ac mains supply.

Asked by gaurravi11 4 years ago

Will this FlyBack Driver work?

Title says it all.

Asked by talbayaty 6 years ago

Scanner Lamp driver...

Could some please tell me what is the output of a scanner's lamp driver. and can i make something cool out of it beside turning any lamps with it!?

Asked by kk khrab 6 years ago

LED Lamp current X DRIVER

Hello very good people, 1. Someone told me that I can connect a 3.8A led lamp to 100w driver 3A (constant current) because the driver will dimmer the lamp. Is this correct? 2. Is the driver that operates according to the capacity of the bulb (3.8A) or is the lamp that operates according to the capacity of the driver (3A)? The current of which one acts according to the other? Thank You

Asked by logoaki 3 years ago

the easiest driver for laser flashlight hack

What is the simplest driver to make for the laser flash light hack

Asked by carl01 8 years ago

How to modify a constant current LED driver 700mA into 350mA?

Is it possible to modify a constant current LED driver 700mA 5W (230V input) to use with 4x1,2W 350mA Diods??

Asked by Allecc 5 years ago

how can I make a 12v led driver?

Hey I want to make a 9-12v 300mA  led driver with out transformer from 220V AC mains .  I want to make the driver cheap . I want to light up a single 12v led .  See the image below

Asked by Soumojit 2 years ago

LED lamp voltage X DRIVER

Hello my friends, What about the voltage, Is the driver that operates according to the voltage capacity of the bulb (20-26v) or is the lamp that operates according to the capacity of the driver (20-36v)? The voltage of which one acts according to the other? Can I use a lamp of any voltage since this voltage is understood the ability of the driver (20-36)? the driver is the same amparage and constant current. Thank you a lot.

Asked by logoaki 3 years ago

2n3055 flyback driver? Answered

Is there a better transistor to use instead of the 2n3055 because those things break easily and are somewhat expensive. 

Asked by Jimmy Proton 7 years ago

One Insanely Skilled Bus Driver

A bus, a tiny bridge, and a 100-point turn with wheels popping off the edge.

Posted by fungus amungus 10 years ago


Ok yes its me again with the need for more computer help...(I am slowly getting better) Ok I just recently fixed up a windows 98 computer (well 4 of them) And I really need drivers for them. What is the best place to find them? Is it possible to put a big database on a CD ? Can I make a disc of drivers from my windows XP computer ? Where can I download a bunch of them ? EDIT: I have to use my windows xp computer to get the drivers because the computer I am working on needs drivers for the Network Card

Posted by littlechef37 10 years ago

Where do I download webcam drivers from?

I need webcam drivers (Inbuit Webcam) for Asus Eee PC 1201T  for Windows XP. I've done a lot of google search for this.

Asked by shardulsb08 4 years ago