Voltage regulator question

[Ewhizz]

Hi guys,
I'm looking at doing an arcade cabinet style thing and have purchased a 12v 4A power supply to power the screen driver. Basically I only want one cable going into the unit so have to find someway of supplying 12v 4a aswell as two 5v sources to power rpi and speaker all from one 12v 4A supply is this possible?
Thanks

 

[Stitches]

Hi guys,
I'm looking at doing an arcade cabinet style thing and have purchased a 12v 4A power supply to power the screen driver. Basically I only want one cable going into the unit so have to find someway of supplying 12v 4a aswell as two 5v sources to power rpi and speaker all from one 12v 4A supply is this possible?
Thanks

You should be able to do that easily with a car lighter socket phone charger. You'll just have to shop around to find one with enough current output to run the Pi. Otherwise, gedda PTH08080.

 

[cheese]

Make sure your screen doesn't actually require all that power, or it may turn off when you power the pi from the same supply

 

[Ewhizz]

Hi
How would i know ? Below is the driver board.
https://www.ebay.com.au/itm/HDMI-DVI-VGA-Audio-LCD-LED-Screen-Driver-Board-LVDS-Inverter-Diy-Monitor-Kit/161076658712?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649

Ive attached a diagram below to simplify.
Thanks

 

[Madmorda]

If you have a cheap multimeter, the simplest way would be to measure the current (amps) the screen is drawing when it's on.