Recent content by Trafiq

Not specifically, no. I looked at the link you provided and I'm just trying to remember basics about op amps from back in 2nd year; it's been a while lol. Correct me if I'm wrong, but I understand that the reason why the diode doesn't light up when I stick a 100Ω resistor in series is because...

Yes. It seems that it doesn't matter if I run it off batteries or adapter, it still does it after a while. I tried with an 100 ohm resistor in series, but then it wouldn't light up. Would you say that's too much? I stuck an ammeter in series and it was telling me about 125mA was going through...

Thanks for the info, Jim. I'll have to keep it in mind for next time however, because it looks like the diode's borked. I took the focusing lens off to see what's going on. When I first turn the laser on, everything is coherent and there is one large blurry green circle under the laser. But...

The diode's got a circuit board attached to it and I can see an op amp-like component, as well as a few resistors or capacitors, so it does have a driver. I guess I'll try to limit the current to 100mA and see how I go (the laser still drops in intensity after a few minutes if I have it...

I don't understand what you're trying to say, Jim. Please explain Edit: Forgot to mention that I did check the resistance between spring and negative and it wasn't 0 ohms, it was more like 4 or 5 ohms.

Yes, it does get a bit warm, jim hardy. A rough, subjective, personal approximation puts the temperature at about 30+-5 deg Celsius after 2-3 minutes of turning it on. And that's through about 1mm of plastic. I can confirm that there is no third wire. There are the two positive-negative...

Thanks for the heads-up Dave. I am aware it is a powerful laser and as such, I am quite careful where I point it. One issue that I noticed is that the module seems to make the diode drop in intensity after about a minute or so. I think it has to do with heat dissipation and its inability to do...

Great! I just connected it and it works fine. Gonna have a nice 70mW green scattered light source in my room now!

I think the driver's already there (it's a laser module) operated by 2x1.5V AAA batteries in series, but I just wasn't sure what were to happen if I were to hook it up to a DC power supply. That's why I'm asking. The batteries apparently provide 1500mAh (Energizer lithium) which comes up to...

Running a 70mW laser off a 4V 200mA power adapter? Hello All, I have a question regarding what voltage and current I need to supply for a load. I got a laser that's rated at 3-4V and 70mW and I have a power adapter that's providing 4V and 200mA. My question is: How do I make sure I don't...

Right, so it doesn't dissipate via conduction or convection apart from wind, but it does dissipate via radiation. I was actually thinking the means could be radiation via infrared or perhaps microwave photons as I was typing the OP, but wasn't sure. Ok so apart from energy transport via air...

Hello everyone, This is my first post on PhysicsForums (although not my first encounter) which I would like to start with asking a question. How does heat from the sun get distributed on Earth so that we have temperature variations between day and night? In other words, if an...