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@Flogged, thanks, that's exactly what I had in mind. Do you know the part number of the diode? Or the model number of the Sony burner? I'd rather start with something I know can work, rather than try diodes "blindly". What's the purpose of the penny and of the straws in your box? :)

Thank you for your replies! I've been thinking about getting one of the kits from Integraf or Litiholo (the latter has self-developing plates, and avoiding the chemicals would be a bonus). Mojo, how do you check reliably for mode hops? I thought the best way would be an interferometer, but...

OK, so I've been playing with my lasers for a while, and burning stuff got old pretty quickly (and the wife doesn't appreciate the stink and the scorch marks around the room either). So I want to try some interesting experiments with lasers, and one of the things that always fascinated me is...

It's hard to define "how warm and how quickly"... Surely way less than a minute (more like 15 seconds); but it's not "hot", more like "definitely warmer than my hand". I'll try to make a sort of graph with temperature/time if I can. What got me wondering is that I know the diode is run at about...

Hello all, I've been experimenting with a M140 build (SF501B, 1.55W output). It's designed to run with 2x 18350 cells. It gets quite warm almost immediately, so I tested the current flow, and I got this: with a total voltage of 8.12 Volts (4.06 for each cell), there are 1.2 amperes flowing into...

Hi all, I obtained a few days ago a very cheap, Chinese charger. I didn't like the cheap-ish look of it, so I measured the voltage and current supplied, and I found out that it was nowhere near the needed values/procedures for a Lipo cell. It actually overcharged the cells to over 4.56V. I...

Hello, I just received today two pairs of Uvex S1933X goggles. I tried them with a few cheap China pointers. As expected, red isn't blocked at all. Then I tried 532 green... This is a grossly overspec pointer. I don't have a LPM but I wouldn't be surprised if it's around 80-100 mW. The dot...

Tired of popping balloons and trying to pop truck tires, are you? :P :)

That is right (mine is at 1% too) but Paypal charges, just for the conversion, 2.5%, more than almost any bank. And on top of that there's the normal Paypal fee... :)

I don't remember right now exactly how I did it. But I think that when you go to the checkout page for a payment with Paypal, there's a link somewhere with something like "other exchange rate settings" or something like that (I have it in Italian so I don't know the exact English wording). If...

Hm, do you know that you can set up Paypal so that it doesn't use its internal exchange rate? I did it a long time ago, now Paypal just charges my credit card with the amount in the original currency, and the bank deals with the exchange rate, and of course their rates are way better than...

Yes, there are two lasers. A laser and its detector are on the left of the photo, and another laser with its detector are on the bottom. I suppose the beams are combined/directed by that weirdly shaped prism in the middle, which directs the beam to the final mirror pointing down. One of the...

Hi, I just wanted to show you a photo of an optical group I removed from a CD/DVD reader (or burner). I have no idea where it comes from, because I removed it years ago, and the original reader has long been thrown away. I think it's interesting: it's fairly big, all metal, and has a lot of...

This is a somewhat old thread, but I noticed no one brought this up: Laser Pointer to the moon I thought it might interest you! :) Cristian

Thanks. I chose Joker because I've read all the positive feedback here, and because he's closer to me than US sellers, and shipments from him arrive quickly :) I've just registered here, but I've been reading for some time. Well, I'm planning to always use goggles (me and whoever is with me, I...

Sure... first to come will be a SFCG 100mW and a 1.5W+ SF501B. But I'm waiting for confirmation of shipment of the goggles before finalizing the order, just to play it safe. :) Then as soon as it's available, the SFCR 200mW. That, too, only after ordering the goggles :)

Hello LPF, I just joined your community and I'm here to introduce myself. I'm 37 years old (as you might notice from my username :) ) and I live in Italy. English is not my language, I'll try to write correctly but please forgive my mistakes! :) I've always been really fascinated by the natural...