Results 1 to 3 of 3

Thread: Flexmod troubleshooting

  1. #1
    Join Date
    Dec 2009
    Location
    Seattle, Wa
    Posts
    413

    Default Flexmod troubleshooting

    Is it possible to burn out a flexmod? What happened was I was turning the gain up and it hit around 1 amp and then the flexmod reset. By reset I mean that power output dropped down to zero and also the 0-bias setting dropped down to something nominal. I connected a meter and put the 0-bias back to 50 ma and the gain to about 350 ma. It worked for a minute and then I tried turning the gain up again and it reset again. Then I noticed the red fault led is on, and now I can't get it go off again. I read that the light will come up if the output circuit is open, so I thought the diode was blown. I then connected another driver that I had (badpip's quad) and everything worked fine. The blue diode I am using is rated at 1.6A. I checked the fuse on the flexmod, it's fine.

    Is it possible that I messed up the flexmod by adjusting the gain while the diode was connected?

    Thanks for any ideas or suggestions!
    Mike

  2. #2
    Join Date
    May 2007
    Location
    1 hr from everything in SoCal
    Posts
    2,550

    Default

    Adjusting the current with the diode hooked up shouldn't have affected it. That could pop a diode but not the Flexmod. What voltage are you feeding the Flexmod? Anything over the diode's rated voltage has to be disappated as heat and these can get *really* hot. Did you have a decent heatsink on the FET?
    Those who fail to grasp art are the ones who criticize it.

  3. #3
    swamidog's Avatar
    swamidog is offline Jr. Woodchuckington Janitor III, Esq.
    Join Date
    Nov 2006
    Location
    santa fe, nm
    Posts
    1,545,451

    Default

    make sure all your connections are soldered instead of socketing the diode/alligator clips.

    Quote Originally Posted by blowfly View Post
    Is it possible to burn out a flexmod? What happened was I was turning the gain up and it hit around 1 amp and then the flexmod reset. By reset I mean that power output dropped down to zero and also the 0-bias setting dropped down to something nominal. I connected a meter and put the 0-bias back to 50 ma and the gain to about 350 ma. It worked for a minute and then I tried turning the gain up again and it reset again. Then I noticed the red fault led is on, and now I can't get it go off again. I read that the light will come up if the output circuit is open, so I thought the diode was blown. I then connected another driver that I had (badpip's quad) and everything worked fine. The blue diode I am using is rated at 1.6A. I checked the fuse on the flexmod, it's fine.

    Is it possible that I messed up the flexmod by adjusting the gain while the diode was connected?

    Thanks for any ideas or suggestions!
    Mike
    suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.

Posting Permissions

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