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

Design Concepts
1

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

2

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

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

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3

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.

4

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

5

So, You have 2A only from LCD’s.I suggest temperature desintegrator :wink:

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