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Propeller Proto board voltage regulators — Parallax Forums

Propeller Proto board voltage regulators

DirtJockeyDirtJockey Posts: 6
edited 2011-03-26 07:58 in Propeller 1
The Propeller Proto USB board is marked 6-9 VDC. The manufactures data sheet says the maximum input voltage for the LM1086 is 30 volts. I am useing the board in an automotive/heavy equipment application with 12 and 24 volt systems. Is it safe for me to apply these voltages to the Proto board?

Additionally, I do not use any of the servo outputs for this application.

DirtJockey

Comments

  • kf4ixmkf4ixm Posts: 529
    edited 2011-03-26 07:17
    The LM1086 CAN be used up to 30vdc with proper a Heat sink attached to it. but the way it's mounted to the proto board, it will not remove enough heat from it to use past 9vdc.
  • DirtJockeyDirtJockey Posts: 6
    edited 2011-03-26 07:39
    It looks as though the LM1086 TO220 heat sink has been clipped, however it does protrude about 1/8th of an inch past the black plastic case. With some careful soldering I should be able to add to the heat sink. Could I possibly use the tab from a damaged TO220 or an old processor heat sink?

    DirtJockey
  • kf4ixmkf4ixm Posts: 529
    edited 2011-03-26 07:47
    In my opinion, i would just use some sort of step-down regulator to power the proto board, like a LM317. then you can adjust the power output to match the proto board input. Plus with the added circuitry and the capacitors in the lm317 circuit, it will help block noise from being introduced into the proto board from the automotive electronics.

    Also, you can use this calculator to come up with the proper resistors for your desired output...
    http://www.electronics-lab.com/articles/LM317/

    Or this one...
    http://www.whatcircuits.com/lm317-calculator-v2/
  • DirtJockeyDirtJockey Posts: 6
    edited 2011-03-26 07:58
    That was my first solution. I still have the LM317 here on my desk.

    Thank you for your help, I often forget to consider heat and power disapation.

    DirtJockey
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