Today on the Internet you can find many schemes of radio transmitters. For many months, almost half of them were repeated, but not a single circuit showed the required parameters. Long-range schemes met, but stability left much to be desired

Surely many would like to have a 5.1 audio system at home but for the frequent prices of such amplifiers are quite large. I’ll tell you how simple and not very expensive to assemble a 4-channel amplifier for such a system. Rummaging on the Internet, I chose the most

Here's a toy soldered by my amateur radio father. What is this tricky device? This is theremin. A bit of history, of course, needs to be told. The first theremin was created in 1908 by the Russian scientist and musician Theremin, from where he got his

I want to demonstrate my creation, if I may call it that. In the past it was a telephone, now it is also a full-fledged telephone, only slightly modified and fairly gaining weight ... The idea to make came spontaneously.

Outside the window is in full swing winter - it's time to do winter sports. And one of the most popular entertainments among both children and adults is ice skating. And you didn’t have such a desire to become more noticeable on the ice,

This is perhaps the most popular simple and common radio bug or radio microphone circuit. A minimum of detail and a minimum of time is required to build this baby. Through the use of a microphone from Chinese products, the sensitivity of this

Now I will tell you about how to make the “Ionophone” with my own hands or how it was also called the “singing arc”. Actually from the names it is already possible to guess that the ionophone is a sound source. The sound in this device comes from a burning arc, the timbre of sound

Everyone probably at least once burned his tongue when he ate hot food (this can happen when you are in a hurry or just do not want to wait until it cools down). I propose to build an interesting plug (you can also spoon) with cooling.

So, an arc discharge is one of the most beautiful manifestations of electric current in gases. An electric arc is not only beautiful, but also useful, it is used for welding metals, a huge temperature also arises around the arc and the air starts very bright

This indicator will inform you in time that your battery is low. The main advantage of the proposed scheme is the clarity of operation. In other words, the signal LED lights up immediately without a smooth dimming. A plus

Blocking - a generator is a generator of short-term pulses repeating at fairly large intervals. One of the advantages of blocking generators is comparative simplicity, the ability to connect the load through

I present to you a very small Tesla coil on a single transistor or a Brovin kacher. In the Tesla coil, a very high alternating voltage of high frequency is supplied to the primary winding, and as a primary winding it feeds the collector current

I am sure that most people use aspirin in limited cases. Such as a headache, with fever, with a cold, etc. I dare to assure you that the use of aspirin is not limited.

Almost every radio amateur faces the problem of an overheated soldering iron when the tip is heated more than necessary. Soldering with such a soldering iron is not very convenient: the solder begins to change color, covered with an oxide film, the flux instantly evaporates or

There are many ways to make guitar pickups. I will tell you about the simplest one that requires minimal knowledge in radio engineering.

This is perhaps the easiest battery charger you can think of. Such a charge more than once helped me out in difficult situations. It is quite simple to assemble on your own in the absence of a soldering iron and other radio elements.

There are times when you need a small-sized light source or light source will not be at hand. This mini flashlight can come to your aid. It can be made in a short period of time from available parts.

When working with a soldering iron, there are many different compounds floating in the air, which naturally do not favorably affect human health. Most radio lovers work indoors and often literally breathe these harmful

Many beginner hams often experience problems with drilling printed circuit boards. To solve this problem, I can advise you to make this device. This is nothing more than a homemade mini drill for circuit boards. . .

I think many remember Leonid Gaidai’s famous film “Operation Y and Shurik’s other adventures,” how they passed exams on the synchrophasotron. This is precisely what this miniature device collection for examinations will be about. And start

This is a simple sensor, given its sensitivity! I decided to use a small ionization chamber with a current amplifier built on a composite transistor as a sensor. This circuit really works well after 5-10 minutes,

Sometimes in the dark it’s hard to find the switch. To facilitate this work, I propose to incorporate a backlight into it. We will need three radio components and a little time. . .

At the writing of this article, I exploited the great interest of users in the design of a USB refrigerator assembled on a Peltier element. In the article I want to tell you in more detail about the use of this element in history, life and in practice.

In the economy of the radio constructor, there will always be old diodes and transistors from radio receivers and televisions that have become unnecessary. In skillful hands, this is wealth that can be effectively used. For example, do-it-yourself solar panel