Flasher on solar cells. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands
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The main purpose of the device is to use it as a flasher in the daytime and in the evening, for example, during various construction road works.
Distinctive qualities of this scheme are simplicity of design, efficiency and reliability in operation and low cost of the device. This device is powered by 2 rechargeable small batteries (Ni-Cd or Ni-Mh) type AAA, 1/2 AAA, 1/2AA, AA. Recharging of rechargeable small-sized batteries is carried out from solar cells (D3). The elements must provide a charge current of the order of 40 - 100 mA during the sunny time of the day.
An LED for a current of 2 - 18 mA was used as LED D20. The operating mode can be selected by element C1. Operating voltage range 2,0 - 2,6 V.
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| Random news from the Archive brain temperature
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Scientists from the Laboratory of Molecular Biology of the Medical Research Council in Cambridge were able to measure the temperature of the human brain.
Forty volunteers aged 20-40 years were recruited, whose brains were scanned in the morning, afternoon and late evening using magnetic resonance spectroscopy. At the same time, an activity monitoring device was attached to the wrist of the participants in the experiment, which makes it possible to take into account differences in genetics and lifestyle - the biological clocks of "owls" and "larks" work differently.
The temperature of the organ varies depending on the region of the brain, age, gender, time of day and the menstrual cycle in women.
The average brain temperature was 38,5 degrees, more than two degrees above the temperature measured under the tongue.
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It is noteworthy that, on average, the female brain was 0,4 degrees warmer than the male.
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The temperature of the brain increased with the age of the participants, especially in the deep regions of the brain.
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