Bipolar power supply 220/3-20 volts 0,5 amps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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A diagram of such a source is shown in the figure. It consists of two stabilized rectifiers, powered by a single transformer T1. The output voltage of the source can vary from 3 V to 20 V at a load current of 0,5 A. The voltage instability coefficient is not worse than 0,5%. Both arms of the source are identical and independent.
The rectifiers are assembled according to a full-wave bridge circuit on KTs405A diode assemblies. The stabilizer itself is made on K142EN1G microcircuits and transistors V1 in one arm and V2 in the other arm. The output voltage is adjusted by variable resistors R2 and R4. Transistors V1 and V2 are mounted on blackened aluminum heatsinks. The area of each radiator is 400 cm2. Variable resistors R2 and R4 type SPO-0,5. Transformer T1 is wound on a magnetic circuit Ш20Х40. Winding I contains 1210 turns of PEV-1 wire 0,3 mm, windings II and III - 90 turns of PEV-1 0,67 mm each.
Publication: cxem.net
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| Random news from the Archive We are afraid of snakes and spiders from birth
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Even small children, who know almost nothing about the world around them, react nervously to pictures of snakes and spiders.
Very, very many of us are afraid of snakes and spiders - albeit not to the point of immediate fainting, but still. However, where does arachnophobia with ophidiophobia (or fear of snakes) come from? Someone believes that we learn to be afraid of spiders and snakes while we grow up, that is, these fears are acquired. Someone, on the contrary, believes that both are innate features of the psyche. On the one hand, it seems that everything is quite simple to find out here: you need to analyze when ophidiophobia and arachnophobia manifest themselves in the process of growing up.
And such experiments were repeatedly carried out: the children were shown images, among which there were pictures with spiders and snakes, and they watched the reaction. If a child noticed a dangerous object faster than something peaceful and harmless, it means that a mental program is already working in him, instructing him to be afraid of these creatures. But such studies usually involve quite large children, so that doubt inevitably arises whether the fear of snakes and spiders is really innate in them, or whether they have already learned it.
Psychologists from the Max Planck Institute for Human Brain and Cognitive Research, the University of Vienna and the University of Uppsala have found a way to solve this mystery. And they solved it simply - with the help of six-month-old babies. At this age, you should not expect from a child that he managed to learn something about spiders and snakes - he has not yet learned the world around him so well. Children were shown pictures of spiders or flowers in one version, or snakes or fish in another, and psychological reactions to the picture were assessed by changes in pupil size. Pupils are known to dilate when aroused, when we experience strong emotions and stress. At pictures of spiders and snakes, children's pupils noticeably dilated; in other words, even very young children can be worried about snakes and spiders.
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