Articles

Some time ago, while browsing aliexpress for the next thing to throw into the corner the day after receiving the parcel, I came across JDY-40 radio modules. Price $ 0.60, similar to NRF24L01 +. What is it? I decided to dig a little deeper. BK2461 - Radio SOC with the C51. OK, "biere",... [Read more]

Hello my dears I will present here my design for an external CPU temperature display from my computer. The display shows temperatures from 0 to 99C while selecting its colour accordingly. The display is made by myself from 0 based on WS2812B diodes, it is controlled via a PIC18F67J60,... [Read more]

I came across a project once David Jones uCurrent . All in all, it is a very simple system. Voltage is deposited on the measuring resistor, which is then amplified x100 and fed to the output. Unfortunately, the item is not cheap, about 70 EUR excluding shipping costs. I decided to... [Read more]

Hello I would like to present for evaluation, possibly to indicate errors and defects of my cell welding machine. I do not have access to professional tools, so the housing looks like it looks. It is made of metal sheets left over from a microwave oven, the front part is made of plywood... [Read more]

Since I bought a 3d printer I have been looking for a program to design parts. I needed a program that was reasonably easy to use and allowed me to draw relatively simple parts, „non-artistic”. After testing various things, I came across Link . For me the bomb. Online... [Read more]

The 3D printer is a subject that has interested me for a long time. I thought my own 3D printer was completely out of my reach, until I had my first exposure to an Anycubic Photon resin printer that I got for repair. Once the equipment was up and running I was able to play around... [Read more]

Hi! I wanted to share with you the description of the construction that my life forced me to make. I had some periodic heart problems and every time I got Holter it all calmed down ;) If any of you have ever tried to sign up for Holter, you know that it is not easy. He waits and waits.... [Read more]

Hi Some time ago I got some audio equipment in RACK housings. In one of them there was a 10-channel signal level indicator board and it asked to build a spectrum analyzer. The board has ten AN6884 chips and 50 3mm red LEDs, but the module was adapted to indicate a voltage level of... [Read more]

Hello my dears I will present here a short test of the E27-E27 adapter with WiFi from BlitzWolf, which allows you to remotely control any bulb with an E27 thread through our home WiFi network. In addition, in the topic I will show what exactly the WiFi module is used inside and how... [Read more]

Here I will describe step-by-step how you can design a 3D printed enclosure for your own project in the free program Blender. The enclosure shown here will be modelled on popular universal enclosures often purchased by hobbyists. Once completed, I will print the enclosure on a 3D... [Read more]

I would like to introduce a simple design of a small inverter for a 3 phase motor with a power of about 400W. View of the inverter in the photos below The inverter is powered from one phase, with alternating voltage 230 V. The output gives a 3-phase voltage 3x 230V. The inverter schematic,... [Read more]

. Hello my dears . In this short topic I would like to present the interior of an old Polish radio receiver UNITRA Sniezka R-207. The receiver presented here I rescued from electro-waste - I don't know how someone could throw it away, it is a good piece of Polish electronics history.... [Read more]

No, this is not another STM32F030 clone as the designation would suggest. It is a Cortex M0 with a pinout similar to the 8-bit STM8S microcontrollers. STM8S/HK32F030M/STM32F030: The HK32F030M has 16kB Flash, 2kB RAM and 448B EEPROM. SPI/I2C/USART/ADC present. There is no DMA, PLL,... [Read more]

I would like to present the first version of the enclosure for my low-power, noiseless mini-server based on a 480GB SSD and a Banana PI M1+ minicomputer. I designed the enclosure in Blender and printed it on my Ender 3 Pro 3D printer using PLA filament. At the end of the topic I will... [Read more]

Recently, I found an offer to sell a COB LED module with a power of 50W. I decided to check whether the given parameters really correspond to reality - below I put the results of my test. 50W COB LED module purchase I found the diode on eBay under the slogan 50W LED Chip COB 30V-36V... [Read more]

Hello colleagues. I haven't published anything for a long time. I spend more time on mechanics in the workshop. Milling machine, lathe. Today, a simple meter, a Zener diode voltage measuring instrument. Diagram from the Russian-speaking forum. Both the simple diagram and the execution... [Read more]

About three months ago a friend asked me if I would build a magnetic polisher for his friend jeweler. I asked what is it what is it? A longer discussion developed here, an exchange of a few e-mails / sms with links and I already more or less knew what a machine it was. The general... [Read more]

. Hello my dears . I'd like to invite you to my brief test and teardown of the 'smart' WiFi touch-sensitive light switch BW-SS3 from Blitzwolf. This switch allows us to control our lighting both normally and remotely via an Android app using the home WiFi network without the need... [Read more]

Recently, a remote-controlled 230V socket stopped working for me. The relay did not respond to commands sent from the 433MHz radio remote control. Such simple devices use a transformerless power supply, I suspected a short circuit on the zener diode, the reason was damage to the foil... [Read more]

I invite you to my test and teardown of the WiFi-controlled PS-16-M 'smart' socket and the dedicated eWeLink/Coolkit app for Android and iOS. The whole thing will be in the form of a detailed description-tutorial showing the configuration of the whole thing and the various functionalities.... [Read more]

Hello my dears I would like to present here my attempts to make a self-contained 7-segment display based on WS2812B colour LEDs, my own PCB and a case printed on a 3D printer. The display shown here I will test with an Arduino and give full operating codes for download. Heart of the... [Read more]

Power indicator two channels 120 led KA2281 2 × 5-channel LED level meter for stereo tape recorders and home stereo This is an integrated circuit consisting of a 2-channel LED level meter driver, designed for use in systems. Can be configured as two channels and one channel. Features... [Read more]

Since my girlfriend is a flower freak, she marked something to stick in the ground, forget about the fact that it is in the ground for a few months and in the meantime find out about how much water is in the ground (aka "when it's best to water" ), preferably via WiFi. With WiFi,... [Read more]

Last December I acquired a second-hand printer, or rather a 3D printer substitute, the Anet A8. Without going into too much detail, the manufacturer's use of what was probably polycarbonate as a frame material very quickly became apparent. I tried to save the cracked structure with... [Read more]

Hello, Tried the 0-30v 0-10a power supply circuit works fine, sprint layout drawings on PCB and gerber files. velleman k7200 new printed circuit board control card Single layer PCB 91.6X72.2mm This laboratory power supply will undoubtedly be a valuable device for both a professional... [Read more]

Hello my dears Here I would like to present a review and my own improvements to the modular third hand/stand/phone holder project from Thingiverse. Modular Mounting System by HeyVye The modular third hand/handle/phone stand system shown here is based on a design by HeyVye of Thingiverse,... [Read more]

Hello my dears I recently found an interesting 3D printable object on the Thingiverse website and decided to do a short review of it here. I think the idea is quite good and worth promoting. SMD Component Magazines by robin7331 All the information can be found on the model's author's... [Read more]

The question of plus and minus in a mains socket is repeated quite often, it is quite natural to associate the two poles of the socket and the two colors of the wires with the battery but wrong . In the case of a cell or battery, we have direct voltage (DC), the mains supply is alternating... [Read more]

Hello my dears I would like to introduce you to my mini-tutorial of the free Blender program. The tutorial will focus on showing that although Blender is more artistically inclined, it is also suitable for preparing a simple 3D printable element. I will map the 3D element from a photograph... [Read more]

Practically the best device for checking a fuse is the sight and the tester designed for this. We check the fuse under load. The meter can, in short, turn us into a balloon. A simple sampler from the market for PLN 5-10. This one was slightly modified for my needs. We start checking... [Read more]