Old 12-23-2015, 08:22 PM #1
Junior Member
 
Join Date: Dec 2015
Posts: 2
Rep Power: 0
FarmBoy is on a distinguished road
FarmBoy FarmBoy is offline
Junior Member
 
Join Date: Dec 2015
Posts: 2
Rep Power: 0
FarmBoy is on a distinguished road
Default What did I do? -- FlexMod P3

Hi all, longtime lurker, first post.

Having trouble with a FM + M140 Diode from DTR. Using a 12v/28A power supply. Have the M+ wired through resistor to V+, and interlock on a switch. Got everything wired and the diode worked just fine at 500ma. Started to turn current up in small increments. At about 700ma, the red light on the FM illuminated. Even after turning the current back down to where I believe it was, the light is still on. Have I blown my diode? After unsoldering the diode, no continuity is show on the diode through a DMM. Should there be? Can't seem to find a definite answer, although I could be missing it. If I hook the DMM up to the FM to measure for current, as instructed in the manual, I get no current, and a red light. The fuse on the FM doesn't appear to be blown. I have measured the PSU voltage when turning the interlock on, and it doesn't appear to drop. Really hoping that it's something obvious, and I haven't blown anything. Thanks for the help.


FarmBoy is offline   Reply With Quote


















Old 12-23-2015, 08:49 PM #2
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,293
Rep Power: 208829
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is offline
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,293
Rep Power: 208829
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: What did I do? -- FlexMod P3

Quote:
Originally Posted by FarmBoy View Post
Have the M+ wired through resistor to V+
Although the MOD input probably has protection, it's only meant for 5V, not 12V. That may have been the reason for the failure. Switch to a voltage divider for future projects.

Quote:
Originally Posted by FarmBoy View Post
no continuity is show on the diode through a DMM. Should there be?
That depends on the voltage your DMM uses for continuity. In most cases, the answer is no.

Retest your diode on another driver. You can also use a resistor to limit the current and hook it up to your 12V supply just for a test... depending on what resistors you have on hand.
__________________
A problem well stated is a problem half solved.
Cyparagon is offline   Reply With Quote
Old 12-24-2015, 09:04 PM #3
Junior Member
 
Join Date: Dec 2015
Posts: 2
Rep Power: 0
FarmBoy is on a distinguished road
FarmBoy FarmBoy is offline
Junior Member
 
Join Date: Dec 2015
Posts: 2
Rep Power: 0
FarmBoy is on a distinguished road
Default Re: What did I do? -- FlexMod P3

Made a voltage divider, and set the M+ voltage at 5v. Still that little red light. Have a new driver on order. Hopefully the diode isn't burnt. Thanks for the help.
FarmBoy is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

























Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 03:21 PM.


Powered by: vBulletin
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC