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  1. Johnyz

    The Practical Laser Driver Theory

    The Practical Laser Driver Theory Greetings everybody, it seems I'm back after a quite long hiatus. Anyway, during my pause, I realised how much info I have gathered when I was working on my driver designs back in the day and I'd like to write it down somewhere, just because. Greetings to...
  2. Johnyz

    PDF scan of European Laser Project magazine

    I just got an interesting magazine/paper/whatever about the European Laser Project (Extreme Light Infrastructure, it is to be built near Prague, I already posted one thread about it), so I scanned it with my iPhone into a PDF, and here it is! Google Docs
  3. Johnyz

    Help wanted - 30 years old HeNe made in Czechoslovakia (Pic heavy)

    I have acquired today a pretty old tube (I'm guessing 30 years) with a matching power supply. The problem? It doesn't work. When I turn it on, a green LED turns on in the power supply, and that's everything. No buzzing from the power supply, and since the tube is covered, I can't see if there is...
  4. Johnyz

    Osram SPL PL90 - 905nm 25W pulsed diode

    Look what I found at Farnell! It's a 25W pulsed diode (actually, max is 30W), that lases at 905nm. It's not a regular case diode, but I think a milled out Aixiz will do fine. According to the datasheet, the case is 4.8mm, and the lip is 5.1mm. Driving it will probably be quite a challenge, since...
  5. Johnyz

    NejTech Evolution - a new BOOST driver - Nearly finished!

    Just wanted to share what I'm currently up to with you guys. Since there is an awful shortage of boost drivers currently, china LED drivers are getting crappier and crappier, I decided it's time to dig up some of my plans from back when we were discussing the linear SimpleDrive. I originally dug...
  6. Johnyz

    445 and AK-007 driver = only 180mW???

    I finally managed to finish my 445 build. It's a diode from DTR, blue Hotlights host and AK-007 driver from DealExtreme. I had a Ultrafire 18500 battery, so I decided to use it. After throwing everything together, I was kind of surprised that the dot (when safely viewed from afar, duh!) is less...
  7. Johnyz

    EBay pack of 10 250mW+ unknown laser diodes

    10 High power Laser diodes | eBay What do you guys think? It might be a scam, but still for $5 there is not much to lose. I don't live in US so I can't bid on it. It may be interesting to do some experimenting on them.
  8. Johnyz

    Blue Hotlights SF-AW210, failed extraction, used red diode

    Hello everyone. Today, my SF-AW210 finally arrived. As I tried to extract it (much harder than a PHR), I managed to break the diode window. But I decided to power it up anyway. Ran for a few minutes (with horrible dot) then LED. I was running it with the OFL 74 boost driver and a 18500. However...
  9. Johnyz

    Feeler: buck laser driver.

    Buck drivers, like linear, need more voltage than diode requires. However, there is one HUGE advantage. While linear drivers convert unused voltage into heat, buck drivers can actually convert it into more current. Example: 0.4A 8.4V (two fully charged 10440's) in, 0.6A 4.5V out (including...
  10. Johnyz

    PHR-803T's on EBay

    Just a quick question for you guys: I recently burnt another PHR-803T diode and I'm looking for a replacement. Are these PHR-803T sleds on EBay for $7 + $5 shipping good? I mean, are they indeed the ones with 100mW diodes? Also, what about the SF-AW210's? How powerful are these and are the ones...
  11. Johnyz

    Superlaser to be built near Prague

    Google Translate Just saw this in news (Google Translated). Only about 90km away from my town. I wonder what technology/wavelength they use.
  12. Johnyz

    SimpleDrive2 feeler - New driver, super easy to set.

    The NejTech SimpleDrive2 The circuit we all love, now in a tight package! Easier to setup than any other driver! Tested by time! As seen here, the NejTech SimpleDrive2 is a simple linear driver. What makes it different is the way you set the current. No more precise turning of the pot, just...
  13. Johnyz

    List of budget hosts

    Recently, I was doing a research about all the available "budget" hosts. I thought it would be nice, if I shared what I found. If you know about any more, please tell me and I will add them right away. Shipping is valid for U.S., overseas may need to add some extra funds. Mohrenberg's Blue...
  14. Johnyz

    Funny thing in Czech customs law.

    Just a quick thing I wanted to share with you guys. I was bored, so I decided to look up what our laws say about lasers. The only thing I found was a tiny bit in our customs law: "All imported lasers must be properly marked with class, power and wavelength." And that's all. Here comes the funny...
  15. Johnyz

    The SimpleDrive2 - Very easy to set! Now with a feeler!

    As I was looking at the drivers we use, I didn't find any budget ones. Aixiz sells some TTL ones, but they have mixed feedback. What comes to mind is our trusty LM317 driver we like to use. Now, the TO220 chip is pretty hard and unreliable to stuff in a real laser host, right? So I made this...
  16. Johnyz

    An idea for a MOSFET driver

    So, as I finally managed to find an empty projector (the one we love extracting Nichia LD's out of) (also, thanks, Greg!), I tried to find a driver for the precious Phlatlight PT-54 red LED. Now, since I was intending to use it with a 5V 10A supply, I needed a driver, that needs less voltage for...
  17. Johnyz

    [CLOSED] Guess what laser is this. - It's a PHR-803T.

    It is REALLY foggy today, so I thought it would be nice to do some beamshotting. The photo that came out was so... unique. Now, I'm only gonna tell you one thing: it is NOT PHOTOSHOPPED. I know it looks like, but it really isn't. Now go ahead and guess what laser is this. And the results are...
  18. Johnyz

    150mW open can red for $8 on eBay

    So, as I was browsing eBay, I found this. Looks like a nice open can. Does anyone know what is that round PCB thingy on the pins?
  19. Johnyz

    SOLVED - Radiant Electronics - Not Happy

    I wanted to purchase their Radiant Alpha LPM and it was out of stock. So, I asked them, why it doesn't let me check out and when it will be back in stock. Brad Reddicopp told me only that it needs to be in stock to check out and nothing about when it will be back. So I wrote another e-mail...
  20. Johnyz

    Idea for a host

    I was browsing DX 18650 flashlights and found this: DealExtreme: $13.07 TrustFire TR-801 Cree Q5-WC 230-Lumen LED Flashlight (1*18650). It is on the front page so I don't know if this has been discussed before. Anyway, I think this would make a nice laser host, what do you think?


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