Shop OBEX P1 Docs P2 Docs Learn Events
Having problems with LM317 Adjustable Voltage regulators - Page 2 — Parallax Forums

Having problems with LM317 Adjustable Voltage regulators

2»

Comments

  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2011-08-03 09:43
    A 'trick" would be to use a standard 7805 regulator with a RED LED tied to ground and a diode from the output. That'll provide about 6.1 volts.
    6VR.JPG
    853 x 363 - 61K
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2011-08-03 12:06
    I was working with this guy and with what he had, his choices, less than ideal, but "workable."

    Alternative resistor values and combinations abound.

    Alternative resistor values and combinations, 7805 "tricks", and even the components called out in the datasheet's applications, alike, all have to go to the right nodes and terminals (get connected right.)

    Everybody's got to crab the act.
  • RagtopRagtop Posts: 406
    edited 2011-08-03 13:20
    The LM317's are indeed bullet proof. After a day of being wired the wrong way they are still working. I really really hate schematics by the way. I know they change the pin layouts to make them easier to read but I just keep forgetting.

    The 3.3V was still dead. I replaced it with another LM317. I used resistors to create a 5V and 3.3V line and left the trimpot on the 6V line in case I ever need another voltage in the future.

    Thank you PJ Allen for listing the pin layouts!
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2011-08-03 16:29
    It's good that you got everything going.

    If you don't live by the datasheet then you're just connecting wires to stuff. :zombie:
  • ercoerco Posts: 20,259
    edited 2011-08-03 17:48
    Monkeys & soldering irons? :)
Sign In or Register to comment.