Search Engine www.edaboard.com

Back Light

Add Question

Are you looking for?:
back off , back via , back propagation , fold back
91 Threads found on edaboard.com: Back Light
thats a switching mode power supply circuit and I guess its a fly-back type (I see pc817 optocoupler). the transformer is ferrite core switching transformer with two output winding the transformer is specially designed for that circuit you can find design information in switcher IC datasheet or application notes
back to basics: A BJT with no bias current should not conduct between collector and emitter pins so the LEDs should NOT light at all with no base current. The only current that might flow is through natural BJT leakage which will be no more than a microamp or so and insufficient to light the LEDs. The IRF840 is an enhancement mode MOSFET (...)
NO you are driving a DC motor at less than 10% of it's rated voltage so there is little back EMF to reduce the current. It is like driving a car from a stop light in 5th gear
Hi, Need to design one LED back light driver circuit with following specifications.Please suggest some Driver IC to complete this. I have design height constrain 4mm. Input : 10 to 15 volt DC Input current : 1.5A max Input power :16W output power : 14W Output current : 580mA Brightness adjustment volt :0v to 3.3V (PWM) Input signal
OK... so then how can I flash the back-light and keep displaying data at the same time. Thanks, Hobbyiclearner. Arbitrate between doing one or the other. I'm not sure why you thought that the for loop would avoid arbitrating the two types of access. Create a counter for your two second timer and save the
Hi, I am fairly new to this whole DIY electronics projects thing, so I'm still running in a lot of things I still have to learn. I've got an old Sony KDL-26P3020 TV than I stripped completely so now i only have CCFL back-lighting pannel with an inverter attached to it. I have tried to find any info about it for a few days now with not much succ
Hi, I am fairly new to this whole DIY electronics projects thing, so I'm still running in a lot of things I still have to learn. I've got an old Sony KDL-26P3020 TV than I stripped completely so now i only have CCFL back-lighting pannel with an inverter attached to it. I have tried to find any info about it for a few days now with not much succ
AC couple then use OP Amp and diode precision rectifier to control voltage controlled current sink or source. Using a log amp will compress the light range to match hearing but less impressive. Search Google images for "light organ schematic" That was my 1st DIY project with 3 channels back in the 60's driving triac controlled lamps. (...)
Hi, Yes, that's why they print it - usually the back side of the paper is blank to improve quality. But maybe they have the gerber files online. Klaus
Take the back off, switch it on in a dark room and look for light around the back of the display. If you can see light it means the backlights are working and you have a video fault. If no light is 'leaking' out, the problem is almost certainly the high voltage inverters or (...)
Hi, I am using hd44780 4x20 LCD to display some data.. I am using PC30f5011 controller and external oscillator configured as XT Oscillator with PLL4X... its not showing any data only back light is switching On. External Oscillator tested its working fine.... Same code Configured as Internal Fast RC with PLL 16x LCD working fine. where i
I have replaced PSU. as burn marks showed damage, red light was flashing then staying on stand bye. After replacing the PSU. I then was advised to replace the Main board, After replacing the main Board still nothing, except the red light blinks continuously now, As I said I am a complete novice first time I taken the back of a tv. I know I (...)
I have spent much time looking for a chip on board dual photodiode for optical sensor in back ground suppression application, but have found anything usable. Guys, need your help to find a small dual photodiode (SMT or COB), please help.
Someone may guess the connecting point if you post clear pictures of front and back of PCB,.
Check the voltage going to the back light if voltage is present than the tube may be gone. If no voltage is there then power supply. Hi guys, Here i have one issue with my 7" Lcd backlight is not working. I was using it in the car but after few days stop to work. I've checked with a flashlight and i can (...)
hello, try to reduce the back adding serial resitor. and play with contrast adjustment.
@ you have back light failure, check inverter supply voltage and back light on voltage. @ burt007, there is not available schematic on net for this model. if you find, pls. upload it here. Regards
hi, I Want to measure temperature value from LM35 temperature sensor by using ADC of PIC16f877A. I made circuit in Proteus. I used this code. It is working in Proteus but on breadboard only Lcd back light on and black squares appear but output does not shows. I used 8MHz crystal. please help me to solve this issue. 102023
i was an Eagle user for about five years in collage , i didn't had many problems back then with the light edition , as most of the circuits was simple and of course for education or hobby , but lately i required to do a pcb design job , and of course i chose eagle , as i have experience with it after i already have made a job with the pro
hello, i used this circuit to turn on lcd back-light(EL) like this : 99500 and this : 99503 but it Sometimes blinking for 4-6 second.( i do not know why ) is there any idea? thanks