Re: TTL modulation help needed September 01, 2016 05:33AM |
Admin Registered: 17 years ago Posts: 13,986 |
Re: TTL modulation help needed September 01, 2016 08:24AM |
Registered: 9 years ago Posts: 346 |
Re: TTL modulation help needed September 01, 2016 08:36AM |
Registered: 9 years ago Posts: 346 |
Re: TTL modulation help needed September 02, 2016 05:47AM |
Registered: 9 years ago Posts: 93 |
Re: TTL modulation help needed September 05, 2016 06:03AM |
Registered: 9 years ago Posts: 93 |
Quote
LarsK
Basically it can be the M140 or Nichia NDB7875 or the Osram PLTB450B .
It is pretty easy to identify which one if you can get to look at it physically, just google the names and you can find pictures of how the diode looks.
If you can't get to look at the actual diode then I don't know - But they all more or less run the same current (A) so just run it at 1.6 A and you will be OK.
See the below links and scroll down to the test pictures - It must be STRESSED that even same brand and type diode does not perform identically. Yours will do a little different from the below links. Especially the VOLTAGE will be different even with the same type of diode. Do NOT try to adjust power by measuring the VOLTAGE across the diode (!!!). You must get a way to measure current (A).
[sites.google.com] (NDB7875 - 1.6A = ~2.3W )
[sites.google.com] (M140 - 1.6A = ~ 2.2W )
[sites.google.com] (PLTB450B - 1.6A = ~2W )
Thanks for reply
So you see, it doesn't really matter which diode it is. Just adjust the driver to outputting 1.6A and you will be just fine.
Re: TTL modulation help needed September 05, 2016 06:22AM |
Registered: 9 years ago Posts: 93 |
Re: TTL modulation help needed September 05, 2016 06:44AM |
Admin Registered: 17 years ago Posts: 13,986 |
Re: TTL modulation help needed [SOLVED] October 03, 2016 03:49AM |
Registered: 9 years ago Posts: 93 |
Re: TTL modulation help needed October 03, 2016 12:47PM |
Registered: 12 years ago Posts: 1,049 |
Re: TTL modulation help needed October 03, 2016 02:07PM |
Registered: 9 years ago Posts: 93 |
Re: TTL modulation help needed October 03, 2016 03:56PM |
Admin Registered: 17 years ago Posts: 13,986 |
Re: TTL modulation help needed October 04, 2016 05:35AM |
Registered: 9 years ago Posts: 93 |
Re: TTL modulation help needed October 10, 2016 03:42PM |
Registered: 9 years ago Posts: 93 |
Re: TTL modulation help needed October 11, 2016 04:23PM |
Registered: 9 years ago Posts: 93 |
Re: TTL modulation help needed October 12, 2016 01:08PM |
Admin Registered: 17 years ago Posts: 13,986 |
Re: TTL modulation help needed October 12, 2016 02:51PM |
Registered: 9 years ago Posts: 93 |
Quote
VDX
... most driver/laserdiode-combinations don't give linear power output, so you'll have to calibrate the output for your setup to get some precision.
Another issue is the moving speed while lasering - when engraving with accelerated moves, then the line-ends tend to get more burnt than faster moves in the middle - so you have to move really slow, so your driver won't accelerate/deccelerate the head.
I'm setting my drivers mostly to max. laser power and define the "effective burning power" through the length of a single pulse typically from 0,5 to 400 microseconds.
But this is only usefull for "velocity-independent" pulsing strategies - either with my own drivers -- or with 3D-printing-softwares, which calculate the pulses for the extruder-stepper in relation to travelled way ...
Re: TTL modulation help needed October 12, 2016 04:15PM |
Admin Registered: 17 years ago Posts: 13,986 |
Re: TTL modulation help needed October 13, 2016 01:15PM |
Registered: 9 years ago Posts: 93 |
Quote
VDX
... this sort of infos is scatteread around various sources - blogs, user-forums (like this one), random finds ...
My personal know-how about lasers and related applications is mostly DIY and collected over more than 30 years occasionally tinkering and working with all then available types of lasers and around all sorts of applications with them
Re: TTL modulation help needed October 13, 2016 05:06PM |
Admin Registered: 17 years ago Posts: 13,986 |
Re: TTL modulation help needed October 14, 2016 03:32AM |
Registered: 9 years ago Posts: 93 |
Quote
VDX
... where are you located?
Lasertack in Germany has some laserdiode-drivers with "real" analog modulation - [www.lasertack.com]
This sort of optimized PWM can only be done with software - the driver can then be a simple constant current driver (e.g. a LM317 or LM338 in "constant-current configuration") with "Pulse-modulating" the current through the driver with a MOSFET ... I'm doing this regularly
Re: TTL modulation help needed October 14, 2016 04:39AM |
Admin Registered: 17 years ago Posts: 13,986 |
Re: TTL modulation help needed November 11, 2016 02:47PM |
Registered: 9 years ago Posts: 93 |
Re: TTL modulation help needed November 11, 2016 05:40PM |
Admin Registered: 17 years ago Posts: 13,986 |
Quote
...
G92 E0
G0 E0
G0 X59.4 Y23.3 F6000
G1 X56.725 Y23.35 E82 F2000
G1 X56.975 Y24.15 E105 F2000
G1 X57.25 Y24.475 E125 F2000
G1 X57.65 Y24.825 E138 F2000
...