Hi, I'm new to the forum and have an application that I need help with. I hope someone out there may be able to help me out!
I am trying to replace the faulty fluorescent backlight in a vehicle touch screen control panel with LED's.
I have suceeded using 12v but this it at one brightness level and is a little overpowering at night time. The touch screen has a dimmer control which gives an output between 3-5vdc, I have another LED backlight that works perfectly on the bench when the voltage is adjusted between this range. When hooked upto the original control the 3-5v being a signal voltage is dragged down to 3v so the backlight is at the dimmest level.
What I need is a variable regulator so that I can use a fused 12v supply as the input voltage and vary the output between 3-5v using the 3-5v signal from the controller, this way there would be enough power to drive the LED's using the original touch screen control. My electronics is basic (too many years passed since I did my HNC!) and I'm sure I could get it to work using an additional knob on the dash but really want to use the original control for obvious reasons. The LED backlight is far superior to the original as it gives a very even display wheras the fluorescent lamps give brighter spots in certain areas of the screen, but the original is 19 years old!
Hopefully I have given enough detail and someone will be able to help in my plight, thanks in antisipation.......
I am trying to replace the faulty fluorescent backlight in a vehicle touch screen control panel with LED's.
I have suceeded using 12v but this it at one brightness level and is a little overpowering at night time. The touch screen has a dimmer control which gives an output between 3-5vdc, I have another LED backlight that works perfectly on the bench when the voltage is adjusted between this range. When hooked upto the original control the 3-5v being a signal voltage is dragged down to 3v so the backlight is at the dimmest level.
What I need is a variable regulator so that I can use a fused 12v supply as the input voltage and vary the output between 3-5v using the 3-5v signal from the controller, this way there would be enough power to drive the LED's using the original touch screen control. My electronics is basic (too many years passed since I did my HNC!) and I'm sure I could get it to work using an additional knob on the dash but really want to use the original control for obvious reasons. The LED backlight is far superior to the original as it gives a very even display wheras the fluorescent lamps give brighter spots in certain areas of the screen, but the original is 19 years old!
Hopefully I have given enough detail and someone will be able to help in my plight, thanks in antisipation.......