Electronics

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 is sometimes not enough, you have to bring it in tight to the face so that the sound level is normal.

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 color absorbs solar energy better than other colors and converts it into heat. As a result, the water in the barrel will heat up.

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 a standard E27 or E14 cartridge. Such lamps are widely used today, because their cost in comparison with LED light sources is not so "biting".

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 include an ammeter in the circuit, you say, and you will be right.

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, a powerful alternating electromagnetic field with a frequency of the order of 35 kHz appears in the coil.

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 its simplicity, is quite interesting and fascinating. Especially if you include two multi-colored LEDs in the circuit.

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 with a voltage of 12-24 V. The welding machine is based on a high-voltage high-frequency converter.

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 in a landfill or two transformers from them. We disassemble the microwave and pull out the transformers.

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 roll around idle, since the next use of it may not occur.

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 is that it is fully automatic. The circuit monitors and stabilizes the desired battery charging current, controls the battery voltage and how it reaches the desired level - reduces the current to zero.

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. Of course, such lamps are commercially available to this day, but I decided to update the lamp to make it more economical, brighter and more durable.

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. Scheme of a simple flasher on NE555 A multivibrator is built on the microcircuit, which generates rectangular pulses.

The most amazing thing is that the circuit of the battery level indicator does not contain transistors, nor microcircuits, nor zener diodes. Only LEDs and resistors are switched on in such a way that an indication of the level of the supplied voltage is provided. The indicator circuit The operation of the device is based on the initial voltage for switching on the LED.

If you have an old computer power supply (ATX) at home, then do not throw it away. After all, from it you can make an excellent power supply for home or laboratory purposes. Modification will be minimal and in the end you will get an almost universal power source with a number of fixed voltages.

The simplest infrared sensor, which will report the presence of an obstacle, can be done with just one transistor. This homemade product has more likely not practical application, but rather theoretical, demonstrating the operation of the infrared sensor of the presence of an obstacle. Of course, no one bothers to make a practical application, say, when building simple robots.

Headphones in our time is an integral accessory of every person! Many of us listen to them while playing sports, on the bus, or even on the way to work or school! But many of the Chinese headphones do not produce such a good sound, so I decided to try to make headphones from the old bluetooth speakers!

One of the simplest circuits in amateur electronics is an LED flasher on a single transistor. Its manufacture is within the power of any beginner who has a minimum set for soldering and half an hour of time. The considered circuit, although it is simple, however, it allows you to visually see the avalanche breakdown of the transistor, as well as the operation of the electrolytic capacitor.

I want to bring to your attention a simple converter for powering fluorescent fluorescent lamps or energy-saving lamps. The circuit is based on a single-cycle blocking generator and consists of only six parts. The transformer is wound around the core of a W-shaped image. The ideal option is a transformer from a Soviet-made telephone.

Good afternoon, dear readers! Today we will focus on the assembly of the soldering station. So let's go! It all started with the fact that I came across this transformer: It is at 26 Volts, 50 Watts. As soon as I saw him, a brilliant thought occurred to me immediately: to assemble a soldering station based on this transformer.

LED, or LED lamps have recently entered our lives widely. And this is not surprising, since they have many advantages compared to other sources of artificial light. Here are a few of them: 1. Profitability. 2. Durability. 3. Security. Both the price and quality of these lamps may vary, depending on their manufacturer.