Master classes:
5 and 12 volt home generator
"I blinded you from what it was ..." :) No one came across a situation where a smartphone swearing abusively at a low battery, and the light turned off as luck would have it? I think many. Or the same story with your favorite netbook, which has 12 volts power?
Switching power supply repair
Video cameras, like cars, have now ceased to be luxury goods and have moved into the category of necessary devices. But, if the camcorder itself is manufactured with high quality and its failure without any external reasons is an infrequent phenomenon, then with blocks
Simple soldering iron temperature controller
For a decent quality of soldering work, a home foreman, and even more so a radio amateur, a simple and convenient temperature regulator for a soldering iron tip will come in handy. For the first time, I saw a diagram of a device in the magazine Young Technician in the early 80's
Simple audio transmitter
This transmitter showed good quality of the transmitted music, so I recommend starting with this scheme. As practice has shown, an assembled generator on one transistor cannot, stand in one place, without an additional cascade, constantly
Car Battery Charger
Every motorist sooner or later has problems with the battery. I did not escape this fate. After 10 minutes of unsuccessful attempts to start his car, he decided that it was necessary to purchase or make a charger himself. In the evening
Portable battery charger
On one of the amateur radio sites I saw a circuit for charging portable Ni-Mn and Ni-Cd batteries with an operating voltage of 1.2-1.4 V from a USB port. Using this device, you can charge portable rechargeable batteries with a current of approximately 100 mA.
Car inverter 12-220V
About six months ago I bought a car. I will not describe all the modernizations made to improve it; I will focus only on one. This is a 12-220V inverter for powering consumer electronics from the car's on-board network. Of course one could
Amplifier on TDA7496SA
The Internet had only circuits on these microcircuits, but the assembled amplifier was never found. Operating mode AB, Supply voltage 10 ... 32 Volts, Stereo configuration, Operating temperature 0 ... 70 degrees. Such microcircuits can be found in modern TVs
Thermostat for hoods
How to make an automatic hood? “It's not at all as difficult as it might seem.” There are very different options, but I settled on one such as a thermal relay. It will work like this: someone will cook something with a gas or electric stove,
Probe indicator without batteries
The simplest jobs related to electricity are difficult to do without measuring tools. It is not necessary to measure the parameters of the electric circuit with a tester, in many cases it is more convenient to do with a universal probe that infects the presence of
Modernization of energy-saving lamps in LED No. 1
Many thanks to the manufacturers of modern energy-saving lamps. The quality of their products constantly makes them move their brains and pushes for new technical solutions. So this time, we will consider the topic of altering failed energy-saving
Modernization of energy-saving lamps in LED No. 2
The subject of alteration or modernization of failed fluorescent (energy-saving) lamps into LEDs has been raised repeatedly. Forgive me the authors of these articles, but most of the proposed options are ineffective and certainly not aesthetic.
LED daylight
Having decided to keep up with the times, and to save my money in the future, I decided to make some useful innovation. More precisely, to remodel lamps with fluorescent lamps into lamps with LED lamps. Service life is high, saving
Smooth on and off load
Probably many would like to add something new to their car, today I will tell you how to do it without any special costs and technical changes in the design of the car. The device that I want to introduce you today is not a big adjustment scheme
TDA2030A Chip Sound Amplifier
I found an unnecessary board from the TV. My eye was attracted by the TDA203A chip. I know that TDA microcircuits are low-frequency amplifiers, there is a lot of information about them on the Internet. I decided to assemble my own simple amplifier according to the scheme ...
Simple soldering station
In modern imported soldering irons, the problem of overheating is often identified. And in domestic, sometimes underheating is observed, it is also observed during voltage landing. In this article I will tell you how to solve these problems and also make soldering more
Universal usb charger
It is no secret that the vast majority of computer users use as such convenient and compact laptops. At the same time, the touchpad did not become a full-fledged, and most importantly convenient replacement mouse. The most convenient option for working on
Amplifier on STK402-020 ... STK402-120
Today I would like to tell you about an amplifier which, in my opinion, is an excellent solution in terms of price-power-quality ratio. And so, in the lead role, we have today the STK series chip. Chips stk - hybrid chips that
Six channel sound amplifier
The idea of creating a six-channel speaker system has existed for a long time. Having set a goal, I studied in detail the characteristics of the sound card and found out that it supports as many as 7 channels of sound. Since I am well versed in electrical circuits, I decided
Simple VLF at TDA2003
Today we will build a simple mono audio amplifier on the TDA2003 chip. The TDA2003 chip can be dropped out of the old radio or bought on the radio market. The rest of the details as well. The amplifier is powered by 3-12 volts. The sound source may be a player
Stable beetle at 100 meters
The article presents the design of a radio transmitting device with a range of up to 100 meters. Such a radio bug was built according to the three-point capacitive scheme (like all other known schemes), the components were carefully selected. Frequency doesn't swim like
Stereo FM transmitter from MP3 player
I don’t have a car, but I decided to use this thing in my own way. Like a stereo transmitter. Why do I need it? And in order to broadcast sound from the laptop to the music center. The fact is that I like to watch a movie on the big screen, on
Converter circuit for gauss guns
The converter is made on the popular timer 555 series.The design of the converter is quite simple and can not cause difficulties even for beginner radio amateurs. The power of such a converter largely depends on the field
Music card
The best gift, as you know, is the one you made yourself. What will be described in this article is distinguished by its originality and will long please those whom you want to give pleasure. However, for such work