Electronics

What kind of human energy is not used to convert it into electrical energy. We got to the thermal one. I will show you how to make an eternal electric LED flashlight that uses the heat of our body. One of the western companies produces such flashlights, using the heat of your finger.

Imagine that you have some kind of device that can disable any electronics at a distance. Agree, it seems like the scenario of some kind of science fiction film. But this is not fiction, but quite a reality. Such a device will be able to make almost anyone with their own hands, from parts that can be freely obtained.

Probably everyone, even a beginner amateur, knows that in order to connect a regular LED to a power source, you need only one resistor. But what if the LED is powerful? Watt so at 10. What then? I will show you a way to make a simple driver for a powerful LED in just two components.

I recently bought a bike to drive to work, and indeed, to ride and enjoy cycling. For safety, I turn on the front and rear lights so that road users notice me better. My LED lights are powered by two AA batteries.

A very simple 50 kV converter, which essentially consists of three elements. All components are available and if desired, it is easy to find. A high voltage converter can be used for various experiments with high electricity, such as an ionizer, a device for checking the integrity of insulation, etc.

A moonlight is a moon-shaped wall light that turns on automatically when it gets dark. The automatic switching circuit is built on only two transistors. The night lamp in the form of the moon is very original, beautiful and unusual. The effect that this lamp produces is simply mesmerizing.

A mobile phone signal detector can detect the presence of an activated cell phone at a distance of about one and a half meters. Thus, the detector can be used to prevent the use of mobile phones in exams, in secret rooms, etc. This device can also be useful for detecting a mobile phone during espionage and unauthorized transmission of video.

A very beautiful Christmas tree can be made if desired. And it is unlikely that anyone else will have one. You can even give this device to someone. The principle of the Christmas tree is quite simple. I will not bring you boards, circuits, microcontroller firmware, because I believe that this design is complicated for repetition.

This amplifier can be used by hams as a power amplifier in radios, players, various toys with sound effects, as an amplifier for headphones, etc. The range of applicability is very large. The scheme is very simple to repeat and does not contain scarce and expensive parts. The amplifier is based on the LM386 chip.

This wall lamp gives a smooth and even illumination. This is achieved by the fact that light is reflected from external obstacles and scattered. Such a peculiar lamp can, if desired, be assembled in about 30 minutes, of course having everything at hand. This wall light consists of only two C-shaped aluminum profiles.

During my life I have seen many different mousetraps and rat traps. It’s not that I am somehow fond of this, but I just came across the breeding of mice from the house. I will tell you how to make a mousetrap that will kill the mouse with an electric discharge. The design, as always, is simple and straightforward. What is needed to make a mousetrap?

A mini drill can be used to drill holes in textolite boards for outputting radio elements. I personally collected a mini drill for this, but you can use it for other purposes. The electric motor for such a mini drill can be removed from an old printer (but not a step printer) or a tape recorder. We need a large syringe, 50 milliliters.

To make a real solar battery at home is almost impossible. For this, you need not only factory specialized equipment, but special chemicals that you simply can’t find. But if it suddenly hurts you, then you can build a low-power solar battery from diodes.

Nikola Tesla is truly a brilliant inventor of all time. He practically created the whole modern world. Without his inventions, we would not have known for a long time about the electric current of what we know now. One of Tesla's bright and amazing inventions is his coil or transformer. Which perfectly demonstrates the transmission of energy from a distance.

The main advantage of this mini soldering iron is that it is powered by a 3.7 V battery. It is not connected to the network and you can easily take it with you. Of course, its power is not great, but it is quite enough to solder the wires or solder some loose radio element. And so, what will be needed to make a mini soldering iron?

I can undoubtedly say that this is the simplest metal detector of all that I have seen. Which is based on only one chip TDA0161. You will not need to program anything - just compile it. Moreover, its huge difference is that it does not emit any sounds during operation, unlike the metal detector on the NE555 chip, which initially squeaks unpleasantly and you need to guess the found metal by tonality.

This is the simplest light music has only one element. Yes, absolutely one and nothing but: no resistors, no transistors ... It is quite possible to assemble such a light and music installation in 30 minutes. All you need is one solid state relay. Solid state relays appeared on the market relatively recently and have already confidently conquered the electronics market.

Here is a simple diagram for automatically turning on the fan and controlling its speed depending on the temperature of the sensor. This simplest circuit, consisting of only two elements, can be used in your amplifiers, power supplies, computers, etc. The operation of the automatic controller circuit As a temperature sensor, the LM35 chip is used.

There is a strong need to make the LED blink, in order to enhance the attraction of human attention to the signal. But to make a complex scheme, there is simply no time and place to place radio elements. I will show you a circuit consisting of only three, which will make the LED blink. The circuit works well from 12 volts, which should interest motorists.

How tightly Li-ion batteries entered our lives. The fact that they are used in almost all microprocessor electronics is already the norm. So radio amateurs have long taken them into service and use them in their homemade products. I contribute to this significant advantages of Li-ion batteries, such as small size, large capacity, a large selection of designs of various capacities and shapes.