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| Electronic Projects Design/Ideas/Reviews Are you building an electronic project or want to? Maybe you need some assistance? Come and submit your electronic questions here and let our experienced members find a solution. |
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| | Thread Tools | Display Modes |
10th February 2008, 07:29 AM
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| Experienced Member    |  Look but how would i control each seperately ?  |
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10th February 2008, 08:07 AM
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| Experienced Member | Cool just looked at it makes sense. I guess timing is everything lol im gonna take a small sleep now . Ill be on in like 3-4 hr |
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10th February 2008, 12:56 PM
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| Experienced Member  | very informative!!
__________________ i would explain it to you but it would make your brain explode!  |
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10th February 2008, 01:00 PM
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| Experienced Member | one question: How are we multiplexing the led's. what we are using to multiplex them?
__________________ i would explain it to you but it would make your brain explode! |
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10th February 2008, 02:34 PM
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| Experienced Member | you would need something like a M4_1E: http://toolbox.xilinx.com/docsan/xil...b0290_274.html As a matter of fact look at MAX7219, MAX7221: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1339 Last edited by AtomSoft; 10th February 2008 at 02:43 PM. |
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10th February 2008, 10:14 PM
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| Experienced Member | Ok im having a issue sort of. I connected to resisters in a series on a 5v supply R1 = 100 ohms R2 = 150 ohms My voltage drop is ok i end up with 3 volts in the middle but i end up with only 5mA instead of 20mA how come? Last edited by AtomSoft; 10th February 2008 at 10:32 PM. |
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11th February 2008, 02:47 AM
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| Experienced Member | You should have 20ma.... Some meters will drop a little voltage in current mode, but it shouldn't be enough to make THAT much of a difference. I assume the meter is in series with both the resistors. Maybe it is defective?
__________________ --- The days of the digital watch are numbered. --- |
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11th February 2008, 03:05 AM
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| Experienced Member | oh didnt notice something lol meter was grounded . I get about .016 now is that normal? |
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11th February 2008, 04:08 AM
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| Experienced Member | It's a little low. You might want to check your meters accuracy against another one; Just connect both meters in series with a resistor and a voltage source, forming a loop, to see if they read the same.
__________________ --- The days of the digital watch are numbered. --- |
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11th February 2008, 04:46 AM
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| Experienced Member | ok i will i actually ordered a new meter coming in this week |
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Linear Mode
