584,830 active members*
5,484 visitors online*
Register for free
Login
IndustryArena Forum > CNC Electronics > CNC Machine Related Electronics > 5V for Picstep getting very hot !
Results 1 to 2 of 2
  1. #1
    Join Date
    Sep 2005
    Posts
    167

    5V for Picstep getting very hot !

    hello all
    i just finished a picstep board
    the board is running fine,
    i connected it outside the pc so i attached a 7805 regulator. no caps or anything ,
    now the 7805 is getting very hot with just 24volt input, i intend to use it up to 40volts so i guess it will even get hotter.

    is there anything i can do to cool down this situation (heat sink would help as i already attached one).

    maybe a current limiting resistor ? any value suggestion ?

    thanks

  2. #2
    Join Date
    Nov 2006
    Posts
    26
    The best solution is not to run from the motor supply. Find an old 12V adapter and run from that. If the board were to draw 100mA (I'm not sure what it actually draws, probably less than that) then the regulator needs to dissipate 3.5W or so at 40V drive. That is way too much. If you put in an external resistor, you just move the problem to another component - there is still 3.5 W that needs to go somewhere.

Similar Threads

  1. Mach3 and Picstep
    By obscurity in forum Mach Software (ArtSoft software)
    Replies: 1
    Last Post: 01-14-2007, 02:06 AM
  2. PicStep with USB
    By Cooper in forum CNC Machine Related Electronics
    Replies: 0
    Last Post: 10-23-2006, 07:24 AM
  3. Bug in PicStep - bad FW
    By RadekCX in forum CNC Machine Related Electronics
    Replies: 32
    Last Post: 07-29-2006, 08:57 PM
  4. I'm looking to buy 3 picstep (v3.something)
    By andreq in forum CNC Machine Related Electronics
    Replies: 1
    Last Post: 06-21-2006, 05:52 PM
  5. PicStep V4
    By Reanimator in forum CNC Machine Related Electronics
    Replies: 11
    Last Post: 10-24-2005, 02:42 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •