Re: PWM control
- From: "Jon Slaughter" <Jon_Slaughter@xxxxxxxxxxx>
- Date: Wed, 30 Jul 2008 14:43:04 -0500
"Dave, I can't do that" <davenpete@xxxxxxxxx> wrote in message
news:07709caa-4e7b-4031-8db4-7d5df6619b19@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi people,
I have an 1992 Synrad laser. I need a PWM controller to set the
intensity. I'd like something that has an input that can be controlled
by a pin on the Parallel port of a computer, but will be happy with a
manual control that I can set for intensity.
Because the laser is so old Synrad no longer has any info on it. I
have made it burn stuff by using a AA battery on the intensity line so
II know it is working now.
I am retired and on a tight budget but thought I may be able to use
this to engrave stuff and a make a few bucks on the side. It was given
to me because the laser was dead, but I now have it working albeit at
only one output level. <grin>
Synrad did say it was controlled by a PWM signal. From their
controller manual...
1us tickle pulse at all times to keep the laser on the verge of
lasing.
Output voltage is 0-5vdc.
Output current 100ma through a 50ohm CMOS driver
I get the impression that anything above a 2us pulse will drive the
laser on.
Can anyone assist me here with a kit or schematic or something,
anything?
Should be pretty easy. How do you want to go about it? Are you used to
programming uC or soldering chips?
One easy way might be to use a 555 timer? There are many kits and schematics
available. You can get individual PWM chips too. Its very simple to
implement it in a uC. If your willing to spend 30-40 bucks on the Pickit2 I
can send you some code that will take the input of a pot and output a
corresponding PWM. (it needs to be the pic24's though)
The PicKit2 lets you program pic's pretty easily by just writing
code(download free MPLAB), and burn it. You can even debug them and it can
act as a logic analyzer(not used that yet). So its a pretty decent
investment if you plan on messing around with this kinda stuff.
.
- References:
- PWM control
- From: Dave, I can't do that
- PWM control
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