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Thanks for the response. In the event that i have many boxes that would mean many motors and hinges. Is there another simpler solution that would work by applying a small current to say a joint and the joint opens and a different current is applied and the opening closes?.
It´s almost as prcise as my description:
I have a resistor. it is huge. It has two legs.
It looks like this -----<====>------
And there are some colors on it. One color is the same as my car. There are many resistors on a tape.
Where should i connect this resistor to increase output power of my amplifier?
But is your box the size of a board game dice or is it the bomb bay doors of a B52?
What power source is available, a hearing aid battery or a power station?
Is it in a fixed position or on the move as the door operates?
How fast does it need to open and close?
How heavy is the door?
Is it a single door or two meeting together?
Is it hinged so it drops from one side or should the door slide to one side?
What space is available around it?
Is it in a hostile environment, under liquid, in a vacuum, explosive gas, very hot, very cold...?
What material is the box made from, can it bear weight of an added mechanism?
Is the opener/closer part of the box stucture or a mechanism external to it?
An acrylitic box with automatic opening the bottom.
I can imagine to mount the boxes on the ceiling of a tv studio and the boxes are filled with stars and glitter...
But then a lot of boxes may open at the same time. Or do you need to open each box independently?
I can imagin a continously rotating mechanism connects all boxes in a row. and in each box there is a magnetic clouch to activate opening and closing of the door.
On the other hand i can imagine that there is someting inside the box (put in manually) and on demand (electromagnetic unlock mechanism) the door is unlocked. With the weight of the inside the door opens and the thing falls down.
With a spring the door closes by itself...
Small motors with gear box should be availble below 3$ each. Look for NOS or surplus material. Maybe in ebay.
Electromagnets may be your best choice. I think the overall energy consumption will be a lot less than using several motors. What you need to figure out is a mechanical latching mechanism for opening and closing. This you will have to design. Let me know if it helps.