Recent content by Tottish

Sorry to hear the new amp didn't solve your problem EH. :( Just keep the spirit high and I know you'll fix it in the end! My laser is in the test bench. It gets pretty hot though. Got a new compressor to cool the lasertube but it still climbs up to about 50 degrees C (about 120degF) after about...

I was just thinking about the temp-endurance of the lasertube. Does anyone have any idea about how hot it can get without being harmed? I will cool mine with air from a compressor and I guess that should do fine since I'm guessing most of the power is wasted in the driver/amp judging from there...

Thanks NightStick! I will just solder it back then. I will (hopefully) finish my housing for the lasertube today, It's looking real nice. I will probably post some pics later tonight (7:20 AM here). Have a nice day fellow laser-enthusiasts! =) Regards /Tottish

Event Horizon: Sorry to hear about your troubles but with your persistence I'm sure you'll work it out one way or another! In the mean time I've got a little problem myself that I would appreciate if someone could help me out with. Take a look at the attached picture. The green ceramic...

Nope, you COULD use the TTL input to adjust the output power of the laser but NOT with an analog signal. That will have to be done with a 24kHz PWM-signal... Assuming all the drivers TTL-input are the same. Talk to Chris if you're interested in adjusting the output-power and he could hook you up...

OK, so this is probably a stupid question for all you HAMs out there but I just have to check so nothing's wrong here. I got my PSU and have burned a little with my laser. There is a faint yellowish glow coming from under the brass-shield over the "transmitting antenna" (the coil), is that...

If you wanna get technical, actually your wallwort is (hopefully) only pumping about 20ma through the optocoupler controlling the modulation. The maximum rating of the wallwort is another matter. ;) I didn't mean to come off as a jerk but I guess it would be nice to keep the facts straight in a...

nightstick I don't know about the benefits but I remember Chris recomending not driving them above 95% once upon a time. Maybe the last 5% only contribute to the over alla Ampareage and heating of the module and not so much to the out-effect? So I guess that could be of interest to you since...

Re: OUTRIGHT BUY! 15W RF EXCITED CO2 BURNING LASER Only 4 amps? That sounds real nice, Mike! Then I might be able to play around with my first 9,7A PowerSupply (should be here soon) before I get the second one that I intend to parallell. Let's just hope there is enough current to actually...

Re: OUTRIGHT BUY! 15W RF EXCITED CO2 BURNING LASER Hmmm. So you're saying that it doesn't ignite by itself at ~50% dutycycle? That doesn't sound right, right? How is the signal on your o-scope? Did you managde to get rid of the nasty statics? What LC-filter did you go with? Type of PWM-cable...

Re: OUTRIGHT BUY! 15W RF EXCITED CO2 BURNING LASER The PWM for these units only need to output about 20ma so I believe that's a little overkill... with a factor of 1500 or so ;) Furthermore it requires 24kHz. Regards /Tottish

Re: GB ROUND 2 OPEN for 10W RF EXCITED CO2 LASERS! Since most of the units seem to be 10W+ you should be able to do some simple engraving with it. Wattage-requirements for diffrent kind of material-processing is listed at Sams laser FAQ. If you want to use it for engraving you would need a...

Re: GB ROUND 2 OPEN for 10W RF EXCITED CO2 LASERS! Comidt: "So you're just applying a straight 4 volts into the PWM? What cycle is that? Do you know?" This would represent a 100% duty-cycle. The picture on my Oscope on the previous page represents about 50%. Look up PWM on Wikipedia and you'll...

Re: GB ROUND 2 OPEN for 10W RF EXCITED CO2 LASERS! Comidt: The priceing on page one (US$300+shipping) is for one lasertube and the driver for it. What you will have to aquire yourself is a PowerSupply that suits your countrys "wallplug-Voltage" and can output about 30V (stableised) and about...

Re: GB ROUND 2 OPEN for 10W RF EXCITED CO2 LASERS! Yeah, Ifiguered I'd make it small so you guys can put together a bigger knob if you feel the need to. Since all the components are SMD the backside of the single-sided PCB is electrically neutral and can be glued on to anything. Here's the...