i have an issue powering my project - cant work out whats wrong.
the project has an arduino, serial 192 x 64 lcd from ebay and a 8 channel relay also from ebay.
basically if i turn on all 8 relays at the same time the lcd goes faint.
in the machine is a 24v psu that i have tried adding this circuit - http://www.eleccircuit.com/power-supply-5v-2a-by-ic-78s05/ which claims to be able to supply 5v 2a. i find with the screen and 3 relays on the voltage regulator gets really hot and everything turns off.
each relay switched on adds around 80ma to the load.
i have tryed 5v from usb 500ma and the screen dims but dosnt turn off, even tryed a ipad charger 5v 2a same problem with screen.
i have noticed that the voltage drops to about 4.4v when its over loaded.
does anyone know where im going wrong, desperate for advise on this!