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Old 02-06-2009, 02:12 AM #177
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Default Re: RF excited CO2 lasers

Dave -- you old fart *;D * *You remember !!!!!!

I was going to try making an odd wood stock for it but it's hard to get a good view.

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Old 02-06-2009, 02:25 AM #178
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Default Re: RF excited CO2 lasers

Leave me alone!

I'm remembering teen-aged fantasies [smiley=evil.gif]

I was 14 when it came out

Peace,
dave
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Old 02-06-2009, 02:35 AM #179
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Default Re: RF excited CO2 lasers

Dave --

I have the video tape. *Watched it last night to see the gun --- Really !!!
Funny spoof on SiFi flicks even back then.
I found a picture of the grip/stock. It's a bit wierd --- even for me

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Old 02-06-2009, 02:49 AM #180
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Default Re: RF excited CO2 lasers

Quote:
Originally Posted by Hemlock Mike
Dave --
I have the video tape. *Watched it last night to see the gun --- Really !!!
Funny spoof on SiFi flicks even back then.
I found a picture of the grip/stock. *It's a bit wierd --- even for me *
Mike

Careful there . . . .Someone will get you a walker. ;D ;D ;D ;D ;D

I haven't seen the movie in a very long time. I saw a DVD the other day on a $9 rack somewhere. I should have picked it up then. Now you've got me thinking about it, Imma haft find it again.

Peace,
dave
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Old 02-06-2009, 03:05 AM #181
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Default Re: RF excited CO2 lasers

Could you adjust the average power by varying the TTL frequency?
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Old 02-06-2009, 03:12 AM #182
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Default Re: RF excited CO2 lasers

The TTL frequency is ~ 24 kHz. *Power is controlled by PWM. *You vary the pulse width ratio.

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Old 02-06-2009, 03:24 AM #183
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Default Re: RF excited CO2 lasers

Daymn who is that chick? She's hot! 8-)
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Old 02-06-2009, 03:25 AM #184
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Default Re: RF excited CO2 lasers

Hot then but ................................... NO

That's Jane Fonda > Bad news in the viet Nam War era. Bad press.

Mike
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Old 02-06-2009, 03:31 AM #185
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Default Re: RF excited CO2 lasers

I've heard that name before, doesn't really have any meaning to me though.
That must have been an older movie...
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Old 02-06-2009, 03:35 AM #186
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Default Re: RF excited CO2 lasers

The movie was made in ~ 1968............ * NEVER mention her name again.

Back to topic ---- you can build a PWM using a 555 timer chip or get one from Chris at Herurr......

Mike
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Old 02-06-2009, 03:53 AM #187
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Default Re: RF excited CO2 lasers

Yeah I will probably be getting one from Chris in the coming weeks and then just glue it into the maximum power output setting. But first I have to sort out a power supply issue. My six laptop power adapter idea isn't working quite as planned, the supplies each run at slightly different voltages and so one of them takes on the entire load and overloads, shuts off, the next one takes over and overloads, and shuts off about the same time the first comes back on. And during this time the higher voltage supply is trying to force current backwards through the weaker ones and its causing a whole whack of weird clicking noises and the laser only gets 3-4 amps max.

So I've ordered some high power diodes to keep the supplies from backfeeding each other and some power resistors to limit the current from each supply.

THEN I can wire up some control electronics and, if all goes well, I can use my time off during march break to build an enclosure and put it all together.
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Old 02-06-2009, 04:03 AM #188
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Default Re: RF excited CO2 lasers

EH --

If you are going to glue the PWM to full power, you don't need a PWM. That's what makes it adjustable on power. If you only want power MAX, just feed the TTL input 5 volts DC - that's all.

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Old 02-06-2009, 04:17 AM #189
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Default Re: RF excited CO2 lasers

No I meant I'd glue it at the 90% max setting which is supposedly the most efficient setting with the highest output power. I'll rent a 20 watt power meter from school and set the laser to the sweet spot and glue the pwm there.
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Old 02-07-2009, 09:25 PM #190
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Default Re: RF excited CO2 lasers

I seem to have run into a problem. I connected power today and the laser started up, ran for about a second, and then the output died. A closer inspection shows that now when power is supplied to the RF board and the PWM, only the "MOD OK" light comes on and not the "RF OK" light. The power transistor doesn't even get warm at all. And no signal is sent to the laser. Furthermore it is not the fault of the laser because it still happens when the laser is not connected, even though it worked fine before. Finally it is only drawing ~50 mA from the 12v supply when before it would draw over 1.5 amps.

any ideas what the problem might be?
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Old 02-08-2009, 12:58 AM #191
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Default Re: RF excited CO2 lasers

EH -- My drivers are not like yours but running one without a load reflects the power as SWR and can blow the big transistors. Ask NightStick -- He's found out a couple times. Radio frequency circuits are VERY different from the old DC circuits of the red pointer crowd. Do you have high frequency test equipment?

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Old 02-08-2009, 01:23 AM #192
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Default Re: RF excited CO2 lasers

Quote:
Originally Posted by Hemlock Mike
The movie was made in ~ 1968............ NEVER mention her name again.
Jesus was made in ~0. NEVER mention his name again.
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