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

Distinguish this converter is that it gives a full-fledged sinusoidal voltage with a frequency of 50 Hz. The inverter converts 12 V DC to 220 V AC, frequency 50 Hz. It has a minimum number of components and a small size.

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.

A very simple 50 kV converter, which essentially consists of three elements. All components are available and if desired, it is easy to find. The high voltage converter can be used for various experiments with high

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 can

A simple detector that will show whether a person is lying or tells the truth. Of course, he is far from a real, modern lie detector - a polygraph, but he deserves attention, since anyone can do it with his own hands. Like any

Our life is unpredictable, and what can least happen is what can always happen. For example, a water leak may occur in a place that seemed particularly reliable. To react in time and learn about such a leakage of water from the initial

Hello! In this article, I will tell you about how to make a simple gas leak detector with your own hands from the available parts. Probably, now even any schoolchild knows that such a dangerous gas as methane is odorless, and detect it in the air without

Laser projectors can be divided into two main categories. Either they use diffraction glass / foil to project the pattern, or they have a system that moves the laser beam in the directions of the XY axis, that is, a classic scan

For me, as a radio amateur, this laboratory electronic bathtub became just an indispensable assistant. If you are engaged in radio electronics, I sincerely recommend repeating it to you. I often have to make printed circuit boards. Manufacturing process

We often find ourselves in situations where the battery of our device (tablet, smartphone, portable speaker, etc.) runs out and, moreover, we are far from the mains. In this case, a power bank can help us, but not everyone can afford expensive

Hello. I want to tell you about my recent "craft", namely the watch on gas discharge indicators (GRI). Gas-discharge indicators have long since sunk into oblivion; personally, they are even the “newest” ones over me. Used GRI mainly in watches and

In this master class I will remodel a searchlight with a motion sensor into a searchlight with a remote control. A motion sensor is certainly good, but in some places it is not as useful as remote activation. I make this lamp for

SIM800L V2.0 GSM / GPRS is a quad-band GSM / GPRS module compatible with Arduino. The module is used to implement the functions of GSM (calls and SMS) and GPRS. The advantage of this module is the TTL interface, having a voltage of 5V, which allows

This is an instruction (guide) on how to make a cheap convenient and portable device for spot welding of metal out of a damaged microwave oven. Please note that this is dangerous, the inscription on

Each of us has long been accustomed to using all kinds of gadgets that make life easier: mobile phones, all kinds of smart phones and tablets, etc. ... In this article, we will replace your usual watering can with a technological device for watering flowers, which will

I want to share with you the performance of watches on the IV-9 lamps in the unit from the TU-154 aircraft. On the case there is an inscription ITV-4, apparently this unit is called that! In their native place, this was a watch made on rigid logic. The man who ordered from me

The 555 series microcircuit (NE555, SE555, NA555, SA555 and their analogs) is an affordable and cheap timer - a device for generating pulses with specific time characteristics. Based on these microcircuits, many can be built.

Among hams and professionals, digital multimeters are very popular due to their multifunctionality. For their power, as a rule, a nine-volt Krona battery is used, which has a noticeable self-discharge, a small capacity, and

Hello friends. Today I want to tell and show you my homemade product that uses voice control. In fact, it is a on / off switch with voice control. A feature of this homemade product is that this device may not

Many have heard of the plasma ball, but not everyone wants to spend money on it. Radio amateurs know that you can make it yourself. Alas, for beginners, amateur radio circuits on the Internet are quite complicated and incomprehensible. This article will help

Once in childhood, for my father, I assembled a primitive pulse charger with capacitor isolation in the primary circuit of a transformer (4 microfarads x 400 V). It was called pulsed because the charge was carried out by a modified semi-sinusoid, with

Often, when I was shopping in consumer electronics stores, I noticed such a device as an air humidifier and never saw a dehumidifier. Someone will now say - in almost any air conditioner there is such a function as an air dryer. AT