ЛУЧШИЙ план на зимний вечер! Дешевые KIT наборы с AliExpress!

Summary

The video features a person assembling and testing inexpensive radio kits. They start with an FM stereo tuner that works right away. Next is a white noise generator with transistors to create a relaxing sound. Finally, a power regulator with a mysterious gold transistor is built. Upon closer inspection, it's an obsolete type and doesn't do anything special. Overall, it's enjoyable building the simple vintage-inspired gadgets, though some components seem low quality or defective.

Takeaways

• 😀 The video discusses assembling and testing some inexpensive radio/electronics kits
• 👍🏻 The first kit is a ready-made FM stereo receiver that works right away with no issues
• 🔧 The receiver chip and components are examined after dissolving the case with chemicals
• 🌀 A noise generator kit is assembled next, producing satisfying background noise
• 🔬 One of the noise generator transistors is dissolved to examine the tiny die inside
• 💡 Finally a light dimmer kit is built around an unusual gold transistor
• 🤔 The dimmer has some issues and the transistor does not operate as expected
• 🌟 The gold transistor is opened up but does not reveal anything special inside
• 👍 Overall the kits are inexpensive but have some interesting parts to tinker with
• 🔜 More electronics kit builds are likely to come in the future

Q & A

What kind of radio receiver kit is being built?

An FM stereo tuner based on a single-chip RDA5807 FP tuner with integrated modules and a powerful digital audio processor.

How difficult is the assembly process for the radio receiver kit?

The assembly is quite easy since all the components are labeled on the PCB and there are not many parts to solder.

What kind of soldering iron can be used for this project?

A simple Soviet 40W soldering iron with a chisel tip can be used since the components are large and spaced adequately.

How is the radio powered?

It is powered by two AA batteries installed in a battery compartment.

What is the purpose of the quartz crystal in the radio?

It provides a precise reference frequency of 32.768 kHz to generate the radio signals.

How does the noise generator kit work?

It uses four low-noise bipolar NPN transistors, with Q1 generating white noise and the others amplifying the signal in voltage and current.

What is unique about the dimmer kit?

It features an unusual gold-plated BT33f transistor, which is a rare obsolete part.

Why did the dimmer malfunction at times?

Possibly due to a defective component or improper assembly.

What technology is the BT33f transistor based on?

A simple structure of lightly doped silicon with an embedded heavily doped electrode.

Will there be follow-up videos on soldering kits?

Yes, the host plans further videos as there are many more interesting kits to try.