That should do the trick!
PM01 Goldmember 1,188 posts Joined Dec 2007 Location: USA! More info | That should do the trick!
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PM01 Goldmember 1,188 posts Joined Dec 2007 Location: USA! More info | Excellent! Please do keep up posted!
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Vascilli Goldmember 1,474 posts Joined Jul 2008 Location: Calgary More info | Jan 10, 2009 02:36 | #980 Okay I did some messed up math, I think I may have gotten something wrong, but if I used a 1750mAh LiPoly pack with 14.8V, and the 1D takes 12V, then you have a 486.111.. Amp battery or something like that, which would calculate to about a 175 Ohm resistor needed. Sounds right or am I totally wrong?
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Headcase650 Goldmember  1,632 posts Joined Jun 2004 More info | Jan 11, 2009 10:04 | #981 Lipoly batteries can be very dangerous and I wouldn't experiment with them. I use to fly RC plains and if you punctured one on impact they would explode in a big way, or charged them wrong or backwards they would explode into a fire ball. These batteries are made to carry a lot of power in a lightweight package and dump it rather quickly, perfect for RC flight, They even need to be charged on a flat hard concrete surface so that if they do burn up nothing gets damaged. The bad thing is that once you short one out, even if by accident it stats the chemical reaction and its gonna explode. There is no stopping it. Lets say you drop your 1D and crack or puncture the lipo battery, battery bursts into flames, magnesium camera catches fire. Its just a bad idea all round. 60D, Canon 18-135 IS, Sigma 10-20 hsm, 24-70 2.8 hsm, 70-200 2.8 hsm, 430EX II, and all the other stuff that goes along with it.
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Headcase650 Goldmember 1,632 posts Joined Jun 2004 More info | Check out these fire balls. 60D, Canon 18-135 IS, Sigma 10-20 hsm, 24-70 2.8 hsm, 70-200 2.8 hsm, 430EX II, and all the other stuff that goes along with it.
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TopGear1Ds Senior Member  600 posts Joined Nov 2007 Location: Silver Spring, MD, USA More info | Jan 11, 2009 11:37 | #983 Headcase650 wrote in post #7052083  Check out these fire balls.
--Matt--
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canonloader Cream of the Crop  More info | Jan 11, 2009 11:58 | #984 Bet they don't want you on an airplane with that in your pocket. Mitch- ____...^.^...____
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RenéDamkot Cream of the Crop  39,856 posts Likes: 8 Joined Feb 2005 Location: enschede, netherlands More info | Jan 12, 2009 13:27 | #985 Vascilli wrote in post #7044384 Okay I did some messed up math, I think I may have gotten something wrong, but if I used a 1750mAh LiPoly pack with 14.8V, and the 1D takes 12V, then you have a 486.111.. Amp battery or something like that, which would calculate to about a 175 Ohm resistor needed. Sounds right or am I totally wrong? Totally wrong. "I think the idea of art kills creativity" - Douglas Adams
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PM01 Goldmember 1,188 posts Joined Dec 2007 Location: USA! More info | 7812 voltage regulator.
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PM01 Goldmember 1,188 posts Joined Dec 2007 Location: USA! More info |
RenéDamkot Cream of the Crop 39,856 posts Likes: 8 Joined Feb 2005 Location: enschede, netherlands More info | Jan 12, 2009 14:49 | #988 Only if the camera doesn't draw too much current! "I think the idea of art kills creativity" - Douglas Adams
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Vascilli Goldmember 1,474 posts Joined Jul 2008 Location: Calgary More info | Jan 12, 2009 18:44 | #989 René Damkot wrote in post #7060364 Totally wrong. the 1750mAh figure is a measure of capacity: The battery can deliver 1 mA for 1750 hours, or 1.75A for an hour, or ... you get the point. A resistor will give a voltage drop depending on the current running through it (U = R * I). Not what you'd want in this case: You want a current independant voltage drop. I think a simple diode would be a better choice: 0.7V drop each. So 4 diodes will give a 2.8V drop.Totally unsure about how much current the camera draws at a maximum, thus also about what diodes to use. Maybe a 1N4001 is fine, maybe not. Also, obviously, the warning about the Lithium batteries is a good one... I knew I did something wrong. I got totally different results every single time I did it.
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mrerico Goldmember 2,281 posts Joined May 2007 More info | Jan 13, 2009 01:58 | #990 Headcase650 wrote in post #7052083 Check out these fire balls. http://www.youtube.com/watch?v=4OsBc8RqSKU http://www.youtube.com/watch?v=SQ0SNESIkWk&NR=1 http://www.youtube.com/watch?v=GbhXf_jhwgE I love how they laugh in the second video
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