Recent content by bg2vo

fenix-store
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    How to test batteries MaH?

    mAh is the area under the power(not voltage) discharge curve. It can be tested and calculated by accumulation/integration. Below is the chart I calculate my NCR18650GA battery discharging at 0.2C(0.7A) at 10 seconds sample interval. I measure the voltage and current by my Graphtec GL220 data...
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    Fenix TK75(3*U2 LEDs, 2600 lumens)

    Just received mine. Together with TK35 and TK21
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    Laser with the longest throw for $300

    1km if we are talking about seeing the bounced light. May be more if you have more power. May be less if its not very dark. All laser disperse. At 1km the light will be scattered into a 1.5m circle.
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    Amazed at the power of an LED laser pointer

    I don't think the substance in our eyes is that choosy. Its not convincing anyway.
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    Telescope mounted Green Laser Pointer problem.

    Some LP work well at low temperature and some are not. You're just unlucky. I've tested dozens of lasers against temperature variation.
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    CNI Lasers: 400mW pointer for $185!

    Yes, main because it cannot focus well. This is due to the large equivalent emitting area(1um x 50um)
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    CNI Lasers: 400mW pointer for $185!

    I have both 100mW-532nm and 400mW-940nm from CNI. I don't recommend their 400mW IRs because the heating effect is not as good as 100mW green. I also have 3W 808nm LD and Yes it's visible. 940nm is totally invisible.
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    Battery for that 10w 808nm diode

    Corona: >>for a 10W LD (CW mode with 2V across the LD and 10W input power means 5 amperes) Actually, 10W is the OUTPUT power of the LD. We need 9 amperes considering the efficiency of about 55%.
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    What is with these...???

    I got one of these unit and found out that the is *NO* current regulation circuit! A simple 0.51 Ohm resistor is used instead.
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    The BADDEST leadlight 105 ever pot at 73mw

    Re: The BADDEST leadlight 105 ever Actually the infrared has much more divergence(if same lens is used) than green making it more difficault to zap balloons at distance.
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    <20mw reflection concerns

    A, We can safely view the Sun light reflected from a white paper which is about 120mW per sq cm. B, if a 20mW laser shine on an area not less than 0.17 sq. cm(diameter is 4.5mm), it has the same intensity. C, The divergence of normal laser pointer is at least 1mRad, will give 5mm dot min. if...
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    808nm, Cool Stuff...! (And possible diode change, a bit of help needed please)

    Lighting cigarettes is also my long time goal but is virtually impossible by using pen-size laser. I tried this many times with my 2W and 3W 808nm LD and the problem is mainly the lens. There is no need to expand the beam any more because it is already very much dispersed. I tried more than 10...
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    Divergence....Can it be adjusted with success?

    Actually, if source that is 1µm by 1µm can theoretically produce a projection K time bigger. Where K = D/f. D is the distance, f is the focal length of the lens used. For instance, if a 10cm lens is used and the distance is 100m, then K=100/0.1=1000, you will get a 1000µm = 1mm by 1mm. Another...
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    termination material

    A sphere with a holl, painted black internally.
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    So what do you use YOUR pointers for?

    I use mine to test transparency and reflectivity of certain things.
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