5v device gets hot

Discussion in 'General Electronics Chat' started by Manny M, Jul 24, 2015.

  1. Manny M

    Thread Starter New Member

    Jul 24, 2015
    Hello all,

    Newbie here.

    I have a 5v device that I apply 5v volts to through my variable dc power supply. The device lights up fine, but starts to get quite hot where I have to turn off the power to prevent it from overheating.

    Can someone help me out here ? Must I introduce a resister to reduce the amps going through the circuit?

    thank you
  2. bertus


    Apr 5, 2008

    What is the device?
    Is there a schematic of the device?

  3. Manny M

    Thread Starter New Member

    Jul 24, 2015
    I dont have a schematic of the device... but its basically an instrument that I will use in my flight simulator. There is background lighting embedded in the unit, the switch that are contained within are wired to my pc's keyboard emulator. The only electric component is the background lighting.

  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    Does the "lighting" require constant current or something?
    If this is an off the shelf product and the "hot" is really a problem then there is something wrong with it and you should return it..
    Or its just a normal condition and you are being overly cautious..

    FYI.. Devices (except for certain ones like LEDs) only "draw" the power they need..
    So its not like your 5V supply is "pushing" too much current through it..
    Example.. You can have a 5V device that normally requires 1 Amp of current.. You could power it with a 5V power supply capable of 1,000,000 Amps and it wouldn't be a problem at all as the device would only draw the current it needs..
  5. Manny M

    Thread Starter New Member

    Jul 24, 2015
    I understand. Thank you for the explanation.
  6. MikeML

    AAC Fanatic!

    Oct 2, 2009
    I am still suspicious that the "lighting" are LEDs with no current limiting resistors...
  7. Manny M

    Thread Starter New Member

    Jul 24, 2015
    I asked the person that I bought this device from and they said since its from a real aircraft, that it gets hot to the touch, even at 5v...

    Doesn't make sense to me as I didn't think 5v should create that type of heat... but I don't now as I'm new to this.

    Id like to inquire if there is any quick and dirty way to determine the wiring matrix to enable switch activation. This is the matrix that Ive been given, but the only two pins that can validate are the last two as they are the +5, Gnd.

    Thanks !