Games looks zoomed

[emmanuel39]

Hi,i'm new in recalbox and i love it,but i have a problem,when i start a game like castlevania, the image looks stretched to the tv,i have no idea what to do,the game looks like this,look the part where it shows the player and enemy:
https://imgur.com/a/5EhXg

[Substring]

@emmanuel39 you power supply is too weak ... That's for the rainbow on the top right

Does this happen only on NES ?

[emmanuel39]

Yeah,i need other power supply,I tried with Links aweking dx on the gameboy color and sonic the hedgehog in the megadrive and it works ok!,so i think the problem is in the nes only