This is not a functional model of the Chernobyl Nuclear Power Plant, where the accident occurred on the night of April 25-26, 1986, which became the largest in the history of nuclear energy. 

In the model, I used a cheap tabletop humidifier with backlighting. From there, I used a microcircuit diagram, which I placed under the roof of the rear hangar, and separately soldered wires to the diodes, which I glued to the model. I increased the power wires to the steam generator. I reduced the water supply stick and here it is important that it can get water from the water tank and press tightly to the steam generator, at the beginning I advise you to soak the water supply stick for a couple of minutes so that it absorbs moisture. From the back, I made a hole at the bottom through which the USB cable comes out. And also a removable part of the roof of the rear box, so that you can get to the button. It turns out that all the electronics are in the upper part, and the lower part is the floor with a water tank.

I printed the pipe from two parts, the pipe itself in two colors and supports, then glued everything to the model, and painted the roof black and the explosion site.

This is my first demo version and there may be some flaws, but it works as a tabletop humidifier.

Also here is a link to my scaled-down model of the Chernobyl Nuclear Power Plant

Assembly instructions.

Since the hole for the wires in the wall is large, I first soldered everything to the board, checked the operation and then mounted it on the printed part.

Checking the circuit: I wet the white stick, turned on the power to the circuit and pressed the button to select the mode so that when the wet stick touches the humidifier disk, steam comes out and the diodes blink. The main thing is to remember which side of the disk should touch the stick.

I glued the diodes to the main part and screwed the board. I put the humidifier disk in the second part and then glued it into the part with the diodes. The main thing is to remember which side the disk should touch the stick.

After another check of the operation, I covered everything with this panel so that the wires were not visible

I cut the stick from the humidifier, but I need to make it so that it fits tightly against the humidifier disk and rests on the floor of the water tank, where I put the spring. Because if the stick does not touch the disk, there will be no steam.

The roof is the part that closes access to the power button, it is placed on top.

At the very end I glued the pipe, as it is very fragile and so as not to break it during installation.

The result is a three-part structure. A floor with a water tank. A station that fits onto the floor and a roof that opens and provides access to the power and operating mode button.

Sorry, I'm not an engineer, but I think I managed to assemble and run it, so you should be able to do the same. By the way, the place where the board is mounted may be smaller, since these Chinese humidifiers come in different types, but you can always place it in another place.