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Entropy

Replacing Minis With Resistors.

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I'm making a coro with punch through minis. The problem is that I only need about 30 minis on a 50 stream. I don't want to leave the other minis dangling behind the display.

I want to change the extra minis to a resistor.

Given 2.5V lamp. Replace 10 out if the 50 string. I got ~150 ohms on a 5W resistor.

Hows that math look?

Thanks.

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Ok. 100 string = .34A. I'm going to cut them in half so 50 string = .17A. Tag says 0.425W bulb.

All standard incandescent 100/50 mini stuff.

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Hey Entropy, the 5 watt resistor will be calling it close! I calculate 4.2 watts will be dissipated across this resistor, and you should double that to make sure it doesn't overheat. 10 watt resistors will be hard to come by, so I would go with 2 300 ohm resistors, 5 watts each, and put them in parallel. This will split the current between and be only 2.1 watts of power dissipated in each. Here are my calculations if you want to review them. They are based on a 50 bulb string pulluing .175 amps (rounded) as you mentioned above. The resistors are still going to get warm, so my disclaimer is...I would go with black out caps instead of adding a resistor. If you go with a resistance, make sure it doesn't touch the coro as it might melt a hole in it.

Line Voltage 120.00 volts Current 0.18 amps String Resistance 685.71 ohms Resistance/bulb 13.71 Ohms 10 bulb resistance 137.14 Ohms Voltage across Resistance 24.00 volts Power dissipated in resistor 4.20 watts Recommend 300.00 ohms Current through each 0.09 amps Power dissipated in each 2.10 watts

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Thanks

I'm going to do a test tonight counting on the cold ambient air to keep them cool. They're animated so there should be time to cool.

I'm hoping to have my little singing trees added this weekend.

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