A very simple flasher can be assembled on the NE555 chip, which is quite common among hams. The circuit contains a small number of elements and allows you to control one or two LEDs.

I tried to insert in the title of this article all the advantages of this scheme, which we will consider and naturally I did not quite succeed. So let's now consider all the advantages in order. The main advantage of the charger

In amateur radio practice, contact welding is not often used, but it does happen. And when such a case comes, but there is neither the desire nor the time to craft a good and large spot welding machine. Yes, if you do it, then it will be

An old 500 W halogen lamp was lying in my garage. I used it to illuminate the bottom of the car from a viewing hole. Very comfortable good flashlight with a handle and a protective grill. But the trouble is: the halogen lamp burned out. Sure,

With this simple welding machine you can cut thin metals, weld copper wires, and engrave on a metal surface. Other applications can be found without problems. Such a mini welding machine can be powered

A simple welding machine for electric arc welding can be done by everyone at home, without the use of any specialized equipment or circuits. All we need is just two microwave ovens, which can be found on

Almost every beginner amateur radio collector multivibrator transistors. This scheme does not require a large number of components and has a principle of operation that is quite understandable for beginners. However, the work of the finished product, despite the simplicity,

There is a need to track the presence of a current flowing in a circuit in two states: either there is or not. Example: you are charging a battery with a built-in charging controller, connected to a power source, but how to control the process? You can of course

A simple induction heater consists of a powerful high-frequency generator and a low-resistance coil coil, which is the load of the generator. A self-excited oscillator generates pulses based on the resonant frequency of the circuit. As a result

The simplest computer microphone is a Chinese capsule connected to the input. This microphone capsule is also powered by a computer input. It consists of a condenser microphone with an amplifier on a field effect transistor. The sensitivity of such a capsule

A solar water heater is also called a solar collector. It serves to heat running water. The simplest solar heater is a barrel painted black and filled with water. Black absorbs solar energy better

Gradually, lighting devices switch to LED lamps. This did not happen right away, there was a protracted transition period with the use of the so-called housekeepers - compact gas discharge bulbs with a built-in power supply (driver) and standard

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. Contribute to this

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 and

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 diagram consisting of only three, which

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.

I can no doubt say that this is the easiest 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. Still, his huge difference is that he

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 large, but it is enough to solder the wires or

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

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.

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 you suddenly really want,

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. Design

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

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.