Search results

Anybody remember that? Fantastic group buy that was, and I still have all but one of the lasers I got through that. Still alive and well are: The 808nm 2W, 650nm 300mW multimode red, 52mW 520nm first generation green diode, 80mW 450nm blue. Also the blue pen laser, it still works but the...

Subject says it, does anyone have the link to this? The youtube account name was "Dick Head". It was a really funny video. It was posted here on LPF but I can't find it now. :confused:

This is a necro-post but just saw this thread and figured would be worth it to remind everyone that most standard safety glasses won't protect against injury from most of these DPSS greens due to passing the IR beam that is superimposed on the green beam. Only exceptions are if the laser...

I have a PL450 on a Flexdrive set to 300mA and I want to pot it down a bit because 300mA is really overdriving it a bit and I'd like to turn that down. Which way do I turn the pot? I assume I'm ok to adjust it with a diode in place, with the battery removed? My PL520 went LED the other day...

I remember "anode" and "cathode" like this: Cathode "kicks off" electrons (the "c" sounds like "k" and "kathode" is the German spelling). To kick off electrons, the cathode must be negative. Anode "accepts" electrons (both start with "a"). To accept electrons, the anode must be positive. It...

That should 'just' be a matter of adapting existing image sensor design to have >3 color 'cells' per pixel and adjusting their sensitivity to whatever color ranges/channels they want. We would need an encoding standard for it, also probably adapted from HDMI or something. I think selling it in...

I noticed a co-worker had a cheapie DPSS green laser. We work in a factory and the air is a bit hazy so even with the bright lighting the beam was clearly visible. I thought, "cool! he has a laser!" and asked him about it. The conversation that followed made me want to take it straight off...

I'm still here, and I haven't forgotten about you. I just got a new job that pays actual, real money, so I hope to get back into the thick of things soon. Who is the current go-to host maker? Is DTR still around?

Glad to hear it. Yeah, those high-wattage diodes pull the battery voltage down pretty hard when the cell is running out of energy. No need to be sorry about worrying. I know that feeling very well, when it comes to the lasers we love.

Good morning. I've just moved into an apartment and I think it would be a good idea to install boxes on the Powerstat 136B's, to cover up the terminals and associated wiring. This is also a good time to install proper power indicators and switches on the units as well. The main thing is...

The common Laser 301 will do just fine for star pointing. The laser you linked to is also fine. It's amazing how inexpensive they have become. I still remember when a green DPSS laser would have cost hundreds of dollars. Please be careful when pointing into the sky or at anything else - you...

Here's the Ehgemus host with the 638nm diode from DTR and Jayrob G2 lens. It's still my favorite by far and I love this general style. It works really well as a star pointer and the beam looks wicked in fog!

Been out of the loop for a while, but as it happens my last job was cheating me out of overtime and there's been a class action and settlement. So, I'm going to be in the market for a new laser soon! Is Ehgemus still in business? I have one of his hosts and it's great, but I know he took a...

A few years back - quite a few years now - I bought a host from Ehgemus and installed a 638nm Osram diode into it. This laser has seen it all - hard drops onto concrete and brick. Sub-freezing temperatures from being left in the car all night. Searing summer heat from being left in the car...

Hey all, It's been a while but I'm still here and I still have 20-odd lasers on my desk that I like to have fun with. I'm happy to say I haven't lost any of them despite having them for years and years now. I have much better income now and it's way past time to expand and get back into...

Are the 750-volt, 1kV, etc. higher voltage meters safe? It seems a bit dangerous to have 1000 volts going to a 10-dollar chinese panel meter. At the very least I would want to put fuses on the meter leads in case something shorts out. I hope these questions aren't too silly. I can't find...

300V meter Is that volt meter a direct-connect type, or does it need a current transformer? I'm honestly not sure. It's pretty clear when an ammeter needs a CT because it will say something like 200/5A on it, but I'm not sure about this meter. It looks like it should be direct-connect...

I live in the USA so my house's electric service is 240V split single phase. The main breaker on the service panel is 200A. But 200 amps at 240 volts is 48kVA. The pole pig feeding my house is 25kVA, and there are three other houses (4 houses total) connected to it. I assume this is fine...

Two of these transformers in series running on a big 240-volt variac would make a fun car starter. Just need a rectifier and a big cap to get DC out. Honestly thinking about building one using my 136B's. The user manual for the 136B includes wiring diagrams showing how to gang them series to...

Been shorting this out tonight with a section of 3/4" copper pipe. The current output of this transformer is just stupid. At 80 VAC input and dead short on the secondary, it pulls 30A off the variac and the primary winding doesn't even get warm. The secondary winding also apparently couldn't...