Recent content by biwema
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Cree XR-E Q5 at 2000mA with 2xAAA lithium batteries
You can calculate the voltage drop ot the Multimeter that way: Voltage = Resistance * Current Example: Shunt DMM: 0.1 Ohm Resistance leads of Multimeter: 0.1 Ohm Connections of Multimeter, LED and Batteries: 0.2 Ohm (maybe even more) Current: 2A (0.1 Ohm + 0.1 Ohm + 0.2 Ohm) * 2 A = 0.8 V...- biwema
- Post #34
- Forum: Non-Flashlight LED Forum
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Cree XR-E Q5 at 2000mA with 2xAAA lithium batteries
In this point I agree with evan9162. Those Lithium cells are bad. With AAA Energizer Lithium you should still have more than 1V after 2 hours at 500mA; at 70mA it should run 18-20hours. - When you measure 3A at 3 cells in series, every cell has 3A. Their Voltages sum up. - When you measure...- biwema
- Post #29
- Forum: Non-Flashlight LED Forum
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Cree XR-E Q5 at 2000mA with 2xAAA lithium batteries
Camera flashs do use a high voltage which is generated from AA cells usind a driving circuit. I think that the efficiency of such a circuit is not optimal and there is quite a loss. Also it might be dangerous if the device breaks in the water. (Never touch charged flash capacitors in cameras)...- biwema
- Post #25
- Forum: Non-Flashlight LED Forum
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Cree XR-E Q5 at 2000mA with 2xAAA lithium batteries
Do you mean I should use these devices or just have a look at those circuits? I assume you meant the former. I think i will go for a LED flash because camera flash do need a too high voltage. I was already thinking about a flash from the camera of a mobile phone. maybe they are strong enough...- biwema
- Post #13
- Forum: Non-Flashlight LED Forum
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Cree XR-E Q5 at 2000mA with 2xAAA lithium batteries
I intend to build a similar construction: A light weight strobe which emits a flash every 2-3 s which can easily be seen in a bright environment. A traditional stroboscope is too heavy for that purpose. A bright LED which is driven by a high current that is powered by one or two AAA cells would...- biwema
- Post #11
- Forum: Non-Flashlight LED Forum
