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How to Make a Two-Step Amplifier

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How to Make a Two-Step Amplifier
Radio for May, 1922
By D. B. McCown, Assistant Radio Inspector

When the receiver which was described by the writer in March RADIO has been completed, tested, and found to work satisfactorily, the owner thereof will find that it will not be sufficient to get all the radio telephone concerts and broadcast matter as loud as he would like to have them. The need for an amplifier becomes apparent at once, and is the only solution to the problem.

The Radio Face

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THE RADIO FACE
Radio for April, 1922

Have you a "wireless face ?"

There has been the "speed face," the "motor face" and the "airplane face." Now comes the "face" that is acquired from listening to a wireless telephone concert. It is the face of radio satisfaction, with the smile that refuses to come off. It is the face of contentment.

Perfume by radio

Details: Category: Articles; Hits: 8

PERFUME BY RADIO
Radio for March, 1922
By JOHN P. MEDBURY

A russian scientist claims to have invented a machine which will send 'perfume by wireless. A man in Boston can buy a dime's worth of perfume at the 10 -cent store and sprinkle his girl in St. Louis with it. Any kind of an odor can be transmitted. For $1.30, a husband living in New York can chloroform his wife in Los Angeles. If he wants to wait until evening he can do it for 70 cents.

Ease of C.W. Transformer Design

Details: Category: Articles; Hits: 11

Ease of C. W. Transformer Design
Radio for February, 1922
By A.H. Babcock

A year or so ago, one of my sons came to me with a transformer core he had traded-in, and asked, "How can I tell how many turns to wind on this for a 110 volt circuit ?" Here was a practical question that demanded an answer in terms a school-boy could understand and apply to every-day use. The answer was found in such simple form that he wound that core, tried it in service, and then went around the neighborhood hunting up transformers to design-for an adequate fee - which his father did not share; another example of the manner in which a business man commercializes the technical knowledge of an engineer.

Simple tube tester

Details: Category: Articles; Hits: 1403

Radioamator 1954/12

A simple solution, made according to the diagram shown in the picture below, allows to check whether the filament fiber in the tube is not discontinuoused and to detect specific defects of the tube (eg increasing the resistance of the filament fiber due to defective soldering to the pins of the socket; shorting the fiber inside the bulb or in the socket, e.t.c.).

Trioda/Triode

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