videoman3857
Full time elf
My wife purchased a heap of Village Buildings for her Christmas Winter Wonderland display that are battery operated. Some 3 x 1.5 volt battery and some 2 x 1.5 volt.
To make it easier to set up and turn on every night, I want to modify these units and use something like a 5 volt 60 watt switching power supply.
My thoughts are to run a figure 8 lead from the power supply, around the display and bring it back to the power supply. - making a ring main as it were (i'm an irrigator, not an electrician/electricaql engineer)
I want to cut off each battery pack/controller at each house, splice on a new piece of cable and tap into the ring main, connecting each house using a simple plug and socket system.
I am assuming that I will need a resistor at each house to reduce the current (?) to stop the LED's from burning out.
If my understanding is correct. The lead voltage of the LED is 3 volts, the LED current 0.018 and my input voltage is 5 volts.
I am assuming the number of leds - which varies from 4 to 8 in each building does not matter.
(5-3)/0.018 = 111.111' (Following the laws of hydraulics) I would round up to the next resistor which I think would is 150 ohms ?
Are my assumptions and calculations correct and what wattage resistor do i need to use?
The size of .25W would suit nicely into my construction needs, but if I need a higher wattage...then so be it.
Thanks in advance for your help.
Peter
To make it easier to set up and turn on every night, I want to modify these units and use something like a 5 volt 60 watt switching power supply.
My thoughts are to run a figure 8 lead from the power supply, around the display and bring it back to the power supply. - making a ring main as it were (i'm an irrigator, not an electrician/electricaql engineer)
I want to cut off each battery pack/controller at each house, splice on a new piece of cable and tap into the ring main, connecting each house using a simple plug and socket system.
I am assuming that I will need a resistor at each house to reduce the current (?) to stop the LED's from burning out.
If my understanding is correct. The lead voltage of the LED is 3 volts, the LED current 0.018 and my input voltage is 5 volts.
I am assuming the number of leds - which varies from 4 to 8 in each building does not matter.
(5-3)/0.018 = 111.111' (Following the laws of hydraulics) I would round up to the next resistor which I think would is 150 ohms ?
Are my assumptions and calculations correct and what wattage resistor do i need to use?
The size of .25W would suit nicely into my construction needs, but if I need a higher wattage...then so be it.
Thanks in advance for your help.
Peter