Radio designer automatic lighting effects
Columns
YOU CAN BUY HERE
With this kit, you can assemble full-fledged speakers with a power of 3 Watts each. The device is powered by 5 Volts, the kit includes everything necessary, speakers, cords and a case. Can be used as computer speakers or listen to music through your phone. As a power source, you can use a phone charger or a computer USB socket.
Radio designer television antenna amplifier UHF
Radio
YOU CAN BUY HERE
And this is an AM/FM radio receiver that you can assemble with your own hands using this kit. The kit consists of a board, the necessary parts and a housing; after assembly, you get a full-fledged receiver. The device is powered by 1.8 Volts, the received frequency range is AM 525-1605 kHz and FM 76-108 MHz, the sound amplifier is made on a TDA2822 chip.
Radio constructor television antenna amplifier MV
Kit kits from Aliexpress
Aliexpress literally blew up the Russian market with cheap Chinese goods. And, of course, for us electronics engineers, this is a huge plus. Cheap radio components, devices, consumables - Ali has it all. In this article you can even read what I recently purchased from this Chinese online store. But today we’ll talk about something completely different.
I think it all started when the Russian company Master Kit began producing kits for beginner radio amateurs. You were given a ready-made printed circuit board and a set of corresponding radio elements in a bag in order to assemble a simple device according to the circuit diagram. Novice electronics engineers with straight handles and a soldering iron with flux could easily assemble the device. In the end, both sides won. Master Keith did not have to solder radio elements and look for a housing for an electronic trinket, and a novice electronics engineer could practice soldering and assemble a fully functioning device for a minimum price. But knowing our Russian business, you can guess that our prices, as usual, are inflated by two or even three times the original cost of the goods. To be honest, I wouldn't say that Master Whale's kits are cheap.
But I wonder if the same sets are available in China? I opened the site, entered the phrase “electronic diy” into Ali’s search, which translates to “electronic craft”, and the site gave me very interesting results. I decided to try it. I ordered a kit for making a watch. The goods arrived in just a month.
The set included a scarf with detailed drawings on it showing where to solder what; a stitched AVR microcontroller with a crib, three two-digit seven-segment indicators, a circuit diagram for the device, and of course, a bunch of various radio elements:
After sitting with a soldering iron one evening, slowly, I soldered this miracle:
I trimmed the corners. Below you will find out why.
I'm still a solder)
To prevent the watch from being reset when the power is turned off, I bought a coin-cell battery for it, since it was not included in the kit:
To power the watch itself, I first bought a 9-volt Krona battery for it, but the watch consumed it in 3 days). I took an old mobile charger:
The power supply range for the watch is from 6 to 12 Volts. What do we have here? 6 Volts, just what you need:
Then the question arose with the body. Chewing the peanuts that I bought in the store, I noticed its container. Eureka!
He inserted the wire, tying a knot so that it would not be torn from the board, and threaded it through the case.
Since the scarf didn’t fit a little, I had to cut it off). But then it fit very tightly and neatly:
Now I always have the exact time down to the second on my desktop;-) The time is adjusted using the S1 button.
There should have been LEDs between the two-digit seven-segment switches, but I removed them because they just gave a dull light, which was annoying. Now you can even wake up in the middle of the night, check the time on your watch, and then fall back to sleep with a clear conscience, because it’s too early to get up) The indicators shine beautifully! Time is ticking right.
Why am I even describing this watch that I didn’t even design? So, let's remember how much this watch would cost me if I made it entirely myself from scratch:
1) Buy foil textolite and all radio elements
2) Run a trace on your computer
3) Make LUT
4) Write a program for the microcontroller
5) Flash it
6) Assemble the device.
Okay, I won’t count the time spent on labor anymore. Let's do the math. At the time of writing:
— microcontroller AT89C2051 — 89 rubles in Chip Deep
— two-digit indicators 3 pcs. — for Ali 1 pc. = 50 rubles, which means 150 rubles.
— small things (resistors, transistors, diodes, button, terminal, quartz) well, I think for everything about still 100 rubles.
— textolite, iron chloride, well, let’s assume you have them. Let's add another 50 rubles on top.
Total: 89+150+100+50=389 rub. Almost 400 rubles, and this takes into account the cheapest radio elements and consumables.
And my set cost... (there should be drumming, fanfare, dancing naked chicks) only 250 rubles! This is back when a buck cost 60 rubles. Now this watch costs 190 rubles (!)
- Yes, well, what is it? Now you can even buy a simple Chinese electronic watch for a hundred dollars in a case and with a normal LCD monochrome display, you say. Yes I agree. But how much fun and practice you will experience if you collect this set 
Ali actually has various sets, ranging from simple blinkers to entire instruments. You can even assemble a full-fledged multimeter. Some guys took the kits and were quite pleased. Everything worked fine. The quality of the scarf is, of course, so-so. When I connected the device for the first time, the first two indicators started working with problems. As it turned out, the coin accidentally overheated and it moved away, breaking the path.
Radio set LED signal level indicator
SETUP AND ADJUSTMENT
The adjustment section has one of the most modern fleets of tuning and adjustment equipment to solve problems of any complexity: JTAG scanner, spectrum analyzers, network analyzers, oscilloscopes, frequency counters, signal generators and much more. All equipment undergoes timely verification by RosTest.
Radio constructor actuator with photocell
CABLE PRODUCTION
Technological production capabilities:
1. Automated measuring cutting and stripping of wires, including those with a shift diameter from 0.07 to 6 sq. mm;
2. Production of harnesses and cable assemblies with solder connectors. The company has extensive experience working with domestic (2RM, ONC, RP, GRPM, MRN, SR, etc.) and imported connectors (DSUB, DIN41612, MINI DIN, IDC, BNC, UHF, USB, SMA, etc.);
3. Installation of PRESS - FIT connectors (pressed into holes) of the DIN41612 series (pitch 2.54mm), Z-PACK (pitch 2mm);
4. Processing of coaxial and triaxial cables with a maximum outer diameter of 11 mm, as well as “sucoform” cables and certain types of semi-rigid cables made in Russia;
5. Crimping of connectors of IDC standards (flat and single cables) and Registered jack (RJ-XX);
6. Crimping cable lugs onto wires.
