Powerful 12/±30 volt converter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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The circuit shown in the figure is a power supply from a Jensen car amplifier (4x40 W). The circuit is simplified - the stages of protection against current overloads of amplifiers and thermal protection are not shown. Groups of electrolytic capacitors are shown as one total capacitor.
(click to enlarge)
The converter transformer is wound on a K42x28x10 ferrite ring. The primary winding is wound "oblique" of eight wires with a diameter of 1,2 mm and contains 6,5 turns; secondary - "oblique" of four wires with a diameter of 1 mm. After winding, each braid is divided into two parts and the beginning of one half of the winding is connected to the end of the other.
The inductor is wound on a ferrite rod with a diameter of ~16 mm. and contains ~10 turns of wire with a diameter of 2 mm. His data is not critical.
Publication: cxem.net
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| Random news from the Archive Silence after snowfall
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Snowy winters are beautiful in their own right, but many of us may have noticed that after a snowfall, something magical happens on the street - an unusual silence sets in, which we would hardly be able to observe on any other day.
A peculiar silence is partly due to the less active person who involuntarily comes after a snowfall, but not only. This effect is also partly related to the acoustic damping effect of snow. Today scientists decided to shed light on this "magic effect".
Going outside after a snowfall may well seem "magic", because the effect of snowy landscapes is significantly emphasized by the change in the soundscape - it seems that everything on the street suddenly subsides.
This interesting effect of all-consuming silence is partly due to a decrease in human activity - there are fewer people on the street, less traffic on the roads. In addition, construction sites are shut down, road repairs are delayed, and other sources of anthropogenic noise are silenced. Even the singing of birds is still muffled.
However, American scientists note that this is not all. The silence after a snowfall is also due to the fact that snow essentially has an acoustic damping effect - that is, it dampens echoes normally bounced off the ground and other surfaces. The fact is that snow consists of ice crystals, which are good sound insulation. However, in this case, they are loosely packed together with a lot of snow - the resulting cellular material is a good sound insulator.
Back in 2008, experts conducted a study in Alaska. Then the experiment showed that a blank shot from a pistol on a snowy surface is attenuated by 30 dB - in fact, this is equivalent to the difference between a conversation and a whisper.
Sound refraction plays an important role in creating "silence after snowfall". This is due to the fact that during a snowfall, the air is warmer near the ground, and colder above it. It is this combination that causes the sound to refract, bending it upwards - this reduces the volume that is transmitted at ground level.
At the same time, if the snow partially melts and freezes, it can improve the reflection. The researchers note that the eerie silence after a snowfall is usually a short pause before the resumption of "noisy work".
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