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| Created | March 17, 2013 |
| Last modified | March 17, 2013 |
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Can anyone help me with this? I am not sure it will work like I did it. I am new in electronics, but i need to light a model that's why i want to build a circuit of LEDs powered by an AC 220V current. Please help me Thank you |
March 17, 2013 |
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The circuit you've constructed is 220Vdc and needs a ground. This gives you 5V across each LED and a current of 457mA. You'd blow them to smitherines and because the supply is so high you're wasting a lot of power thru the resistors. CL is currently a bit tricky to model LED circuits, unless you use the specific models provided. The simplest way to drive LEDs is with a DC supply just a bit higher than the sum of voltage drops of the LEDs in a series circuit with a resistor to limit the current. Standard LEDs run on 10s of mA of current and a few volts drop while 1W LEDs run on around 350mA with a 2-4V drop across each one. You could use a regulated dc supply, say from a mobile phone charger with the series circuit described above. With the specific LEDs you've chosen a 9Vdc supply connected to a series circuit of 150R + 3 x LEDs provides the 20mA current required. Don't forget the ground in modelling circuits, I've wasted hours wondering why things didn't work because of it! :) |
March 17, 2013 |
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