4 backlit lcds + 32 led rings. How to power them?

[Alkex]

Hi All,

I plan to builld a nice controller with 4 2x40 backlit lcds, eache with 8 encoders/ledrings below (like the mackie c4)

I know that 7805 regulators can get very hot with backlit lcds, should I plan a special supply for this project?

I'm no expert in electricity so any advice would be well apreciated!

thanks

Alex

[LenweTasasartir]

IMHO, You can use 3A version of LM7805 - LM78T05. Ofcourse with radiator ;)

If 3A is still to low, You can connect regulators together as at picture, or just use separate one for backlight of every LCD

[nILS]

It depends on the LCD and type of backlight how much current they'll use. Reichelt sells some "low current" ones that really only need a couple of mA. Check the datasheet to see how much the ones you use need. Add it all up, be a pessimist and multiply the result by 1.3. Then you'll have an idea how much amperage (;)) you'll need.

[Alkex]

Hi,

Thanks for your answers, the lcds I bought from Voti require 420ma, so I guess I'll use radiators...

... or watercooling  ;D

Cheers

Alex

[LenweTasasartir]

So, You have 2A only from LCD's.I suggest temperature desintegrator ;)

But... why LCD must be backlighted from regulated voltage?! Can't it be just around +5V?