Recently there is a rapid displacement of the cassettes compact discs (CD). Among the reasons for this and the continuous increase of requirements to quality of sound reproduction and virtually unlimited service life “compacts”, and reducing the value gap between them and the tape carriers of audio information. So, in June 2001, the market price of one CD with modern recordings is consistent with a cost a half to two cassettes. However, equipment to play music CDs is still very expensive and not everyone can afford its purchase.
CD PLAYER from old COMPUTER
For its production you will need two capacitors, a resistor and phone capsule (see diagram). Removing the insulation pad under the membrane of the phone parts are mounted directly in the capsule. Check the transistor is connected to the terminals of ALL the circuits. Occurs phone the sound vibrations talk about the health of the transistor. About its amplification factor β can be judged by the intensity of the sound: loud sound — high β, the weak — β low.
will inform you as soon as will fall the first drops of rain or humidity exceeds the norm. Device “look” and the fluid level in the reservoir tank.
With the calculation of the resonant circuits (filters) have to face almost every radio Amateur. It is proposed to sub-contract the performance of this work a personal computer, using the program, interface is understandable and accessible to almost anyone. It all comes down, essentially, to the answers to the questions that are displayed on the monitor screen.
When 25 years ago on the pages of Newspapers and magazines began to appear about the creation of an electronic cybernetic machines are able to play dominoes, checkers, chess and other games, readers in different ways embraced the news. Alone, tossing up her hands in astonishment, and said, “just Think! What came to technique!” Other, moderately severe, people shrugged their shoulders: “Do scientists have nothing better to do?” “What are you — objected to them and others, not so serious, — let them enjoy themselves. It is necessary for scientists to have a rest after hard work”.
My thyristor voltage regulator (THREE) is easy in manufacture and adjustment, linearity regulation and high power output — 200 watts without heatsink and 1000 watt radiator cooling area 50 cm2.
A variety of machines are used to evaluate sports competitions. Automatic light displays have become commonplace at hockey games and at competitions of figure skaters and boxers, weightlifters, and gymnasts. It is usually complicated electronic device.
Take a look at the placed on the fourth page of the cover. It would seem that the similarities between these fun figures and radio? However, a question may ask the inexperienced reader, but for the guys from the Moscow Palace of pioneers there are no secrets: inside each colorful souvenir — detector receiver. For example, this tiny doll made by Vladimir Trusov, takes the radio station “Mayak”, operating on the wave of 547 m, and “Lunokhod” Yuri Kozyrev— long-wave
In recent years, widespread integrated circuit, which is a nearly complete unit (amplifier, radio or audio frequencies, a detector, etc.) or radios in General. However, for all its appeal (especially for mass production of narrow-purpose machinery) excessive specialization of IC circuit is devoid of flexibility and impedes the solution of diverse tasks assigned to the electronics. Report that and produced a huge number of more versatile chips, the so — called operational amplifiers (op-amps).
In the age of microelectronics, computerization and display multimeters gauges perceived by some almost as an anachronism. However, life proves the fallacy of such views.