Unusual Nightlight

Good afternoon! Today we will talk about the original night light, which will serve as an excellent decoration for your window sill. So let's get started! A 100 watt incandescent bulb is taken as a basis.
Unusual night light
First we need to dismantle the base. This is done as follows: With tongs we open the top contact of the lamp, then with the help of a screwdriver and the resulting hole we get rid of the black dielectric. After that, with ease we “tear off” the threads and the remnants of the base. Glue may remain on the glass, nothing terrible. We will cover it with a new base. Next is the work with glass! Therefore, wear gloves and goggles. At this stage, we need to remove the inside of the lamp. To do this, use a straight screwdriver to gently press on the inner walls of the lamp. When the flask with antennae and filament is broken, we take it together with small fragments, wrap it in a napkin and throw it away. Put the resulting vessel on the waste cover with the opening facing up. In order not to slap the working table, put a napkin under the lid.After all, followed by working with chemical reagents. I will say at once - they are safe and generally available. The so-called chemical algae will grow in the lamp. To create them, we need liquid glass (sold in hardware stores, then JS) and copper sulphate (can be found in the shops to give, this fertilizer).
Unusual night light
In a separate jar we make a solution: we mix water and ZhS in a 2: 1 ratio (two parts of water, one part of the liquid crystal). By the way, liquid glass can be replaced with silicate glue, in which case the proportion will be as follows: 6 parts of water, 1 part of glue. Instead of copper sulfate, you can use iron sulphate (also fertilizer) or magnesium sulphate (sold in a pharmacy, it is powder to It grew seaweed, it must be moistened with a small amount of water and let it evaporate, due to this we will increase the size of the crystals, because the larger they are, the higher the algae). The color of chemical algae depends on the reagent: ferrous sulfate gives black color, magnesium sulfate - white, copper sulfate - pleasantly blue. So, we take a little vitriol. Unusual night light
And we fall asleep at the bottom of the lamp.
Unusual night light
And fill it with a solution of liquid glass. When you pour, drip a little bit of the solution on the lid, it dries and adds stability to the whole structure. The chemical process has begun, in a few minutes the first algae will begin to form.
Unusual night light
They grow due to the fact that the water from the solution gets inside the crystal, changing its structure. As long as the algae grow, we will deal with the electrical part. I fixed the LED on the caps from under the test tube (you can take the cap out of the valerian).
Unusual night light
We plug the lamp, we place the contacts of the LED as in the picture below, to the plus I solder a short piece of wire so that it fixes the battery.
Unusual night light
And do not forget to glue the contacts with tape, the battery should not touch them. Since in the future access to the battery will be difficult, you need to optimize power consumption. Yes, you can just put a switch, but it's too simple and uninteresting.Therefore, I created a simple adaptive brightness control scheme:
Unusual night light
Parts list:
  • VT1 - kt315 (or any other npn transistor structure);
  • VD1 - photodiode, anode (+)
  • VD2 - LED;
  • R1 - 100kOm;
  • S1 - latching button (take the smallest one you can find);
  • BAT - a “tablet” type battery (model CR2025).
Plus leg The photodiode (to which the power supply is minus) is marked with a white line on the part.
Unusual night light
The resistor R1 and the photodiode VD1 assembled a voltage divider, from the midpoint of which it goes to the base of the transistor VT1. The load is our LED VD2. The more light falls on the photodiode, the less voltage is applied to the base (inverse proportionality). Added a button for the completeness of the functional. All this scheme should be placed at the bottom of the cap. I took it from an unsuitable LED lamp
Unusual night lamp
The appearance of it is more beautiful than that of the sockets of ordinary lamps. Get rid of the plastic rim. In the upper part of the base, drill two holes for the legs of the photodiode. They need to be extended by about a centimeter.Then we drip a bit of super-glue and attach the photodiode.
Unusual night light
Next, already inside the cap, very compactly solder the rest of the components. Unusual night light Three wires go to minus the LED, to plus and minus the supply from left to right respectively. Fix the button with hot glue, the main thing is not to overdo it. The battery is soldered quickly with a drop of soldering acid. Solder the wires to their places. Lock the lamp and cover the cap with a lid. Because of the remnants of the old glue base entered tightly and securely.

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