Articles

Recently I have encountered the problem of not being able to buy a new remote control for my ONKYO turret (discontinued). In my RC-647M, the buttons stopped working one by one. Cleaning was no longer effective. I am not convinced by the methods of replacing erasers or drawing with... [Read more]

Hello. I have been interested in RFID technology for a long time and today I would like to present the development of my old design, namely an RFID card reader with an integrated antenna on a PCB. Due to the complicated structure of the antenna (small distances between the paths),... [Read more]

Hello! 1. What is this? The detector I want to introduce to you is a simple device that allows the detection of alpha particles in the air at atmospheric pressure. It consists of two parallel electrodes: one in the form of a metal plate and the other made of thin wires. As I mentioned... [Read more]

I would like to present a printer of my construction, which I called BiBONE At first glance, similar in construction to the RepRap Prusa Mendel, but this is only appearances. Unlike Prusa's flaccid design (M8 rods) BiBONE has a frame made of M12 and M10 rods. to which linear guides... [Read more]

Introducing the Line Follower class robot named Impact. This is an improved version of previous design described in the largest forum of Polish amateur robotics. The robot was created in 2011, until now he was the winner of all competitions in which he participated. The biggest success... [Read more]

The latest results were announced last week research cryptographic files that showed threats in the method encryption AES-256 data, used in most protected internet transactions and more. AES-256 (Advanced Encryption Standard) is a symmetric block cipher used since 2002 by the American... [Read more]

The only such portable AVR programmer. It will help wherever you need to update the software, and the target chip is in a hard-to-reach place and we do not have the ability (or the desire) to drag a laptop and a lot of wires with us. Easy to use, low cost, super small, super fast,... [Read more]

Hello. I would like to present the desoldering station ZD-915 that I have made. The modernization was done already in the first week after buying the device. The condenser, which exploded inside the station, contributed to this. I found that sending back the equipment for warranty... [Read more]

Spot welders are used in almost all plants where it is necessary to join sheets. The advantage of welding machines is the precision of joining (with very good electrical contact), and a very low voltage between the electrodes, which makes the device safe. The presented device is of... [Read more]

Hello I would like to introduce my first fully self-made construction. My goal was to build at the lowest cost of the station that I could power the Weller WSP80 soldering iron. During the construction I was learning to program in the bascom, I used atmega8. I have plans to make another... [Read more]

Hello to all forum members, I am writing my first post so please be understanding! I would like to present my amplifier and get your opinion on the appearance and used lamps and other components. The amplifier is a typical Single Ended based on EL34 tubes in the power stage operating... [Read more]

It is an auxiliary miniature metal detector that is used for precision the location of small metal objects in the ground. With it, too we will determine the location of metal pipes in the wall or reinforcement bars in the ceiling, which is important when drilling holes there. Low-cost... [Read more]

With the increasing number of functions, buttons and switches, car interior lighting is starting to play an increasingly important role in driving safety at night. The times when only a few traditional light bulbs were installed in the car, helping to find seat belts or illuminating... [Read more]

Atmega fusebit doctor, as the name says, is a device for repairing mismatched fusebits in microcontrollers from the AVR family. The biggest problems are setting the wrong clock source (CKSEL fusebits), disabling SPI programming (SPIEN fusebit), or setting the reset pin to I / O mode... [Read more]

I used Nordic Semiconductor's NRF24L01 as wireless communication systems, they operate in the 2.4GHz band. Audio is compressed to MPEG1 layer3 format. Transmitter: It was built on the AT91SAM7S64 microcontroller. As the transmission speed of NRF24L01 is about 400kbps (with acknowledgment... [Read more]

Hello, I was bored so I decided to make a go-kart and at the same time I took pictures so that there would be no more stupid questions about: "HELP, GIVE A SCHEME HOW TO MAKE A GOKARD". My construction is not finished yet, no bolted wheels etc. but feel free to comment. The design... [Read more]

A mercury mercury rectifier (also called a Hewitt rectifier) is an electrical rectifier used to convert alternating current into direct current. These rectifiers were used in all applications requiring high power, from several kilowatts to several megawatts. Operating voltages ranged... [Read more]

Hello all. I would like to present devices that I and two friends made for the subject of Microprocessor Technology at AGH. At the same time, this and my colleagues' applications will be on display at the Krakow Science Festival on May 14 from 11:30 to 16:00, in the main hall... [Read more]

Hello. I would like to present the horizontal track that I built with my father during the winter. The design of the cutting part is now complete (only paint remains). Now we are waiting for spring to lay the foundations for the track. The construction was based on photos on the Internet.... [Read more]

We've all struggled with a jamming key on the keyboard. This is a problem that anyone can deal with quite easily. Below is a short video with a very simple way to fix a button jamming. We should also remember that periodically you need to disassemble the keyboard, remove all the... [Read more]

I warmly welcome all fans of high voltage. I would like to introduce my tube tesla coil on the GU-81M lamp. The coil was created according to the diagram on page Link And what to write here, I wish you good luck in building the tlock and meter coil 1998 I used this scheme (not really)... [Read more]

Hello all. Unusual start the post from thank you. First of all, I would like to thank my friend Natalii , which using a gel pen she breathed life into this piece of electronics :) . Thanks are also due to colleague Radek, who served good advice during the design of the system. I also... [Read more]

I decided to write such a topic because there are often questions "in series or in parallel" "how many Ohm" etc. So : As if someone did not know or forgot, I remind you: When connecting in series, "Ohms" increase (add them), e.g. 2x8? in series connection is 16? 8 + 8 = 16? 3x8? in... [Read more]

At the beginning I would like to say hi, because as you can see this is my first post. I've been browsing the electrode for a long time, but I've never been on the forum. Today I decided to take a step forward, show myself with something specific. The idea of the project is... [Read more]

Hello. I made a soldering iron for plastic. I saw a similar company, and that the construction is very simple and you have to pay for welding, it is worth doing. 5mm diameter, 2m of hose, a piece of cable with a plug. The required pressure is 0.5 ÷ 1.5 bar. I used a simple regulator... [Read more]

In general, the basic rule is that the impedance of the loudspeaker must not be lower than the minimum impedance specified on the back of the amplifier with which the amplifier works. On the back of the amplifier, as a rule, the speaker impedance on the Western minimum is written,... [Read more]

How to have fun at the expense of the neighbors ... make yourself a gun to turn off the TV sets in the estate. The recipe, as usual, came up with a fan of unusual solutions and posted the guide on the Internet. So you can construct... from binoculars and a special universal remote... [Read more]

My proven stabilizer circuit on the transistor. [Read more]