Economical electronic tuner with high sensitivity based on the TA8122 chip. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Economical electronic tuner with high sensitivity based on the TA8122 chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / radio reception

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It differs from similar circuits in its high sensitivity (1 μV), low current consumption (20 mA) and supply voltage (6 ... 12 V), the presence of electronic tuning and stereo ULF with electronic volume control. The use of quartz resonators and filters greatly facilitates the tuning of the receiver.

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Economical electronic tuner with high sensitivity based on the TA8122 chip

Publication: cxem.net

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Pond under the film 05.05.2004

The Canadian firm "Flexible Solutions" proposes to protect reservoirs from too much loss of water to evaporation by covering the water with a thin film of organic matter.

For this, fatty alcohols are used - hexa-decanol and octodecanol. Their molecules have two ends - hydrophobic and hydrophilic. When fatty alcohol enters the water, the hydrophilic ends are attracted to the water, and the hydrophobic ends stick out, as a result, a monomolecular film is formed over the entire surface.

As shown by field experiments in India and Morocco, evaporation can be reduced by 30-45 percent. In one reservoir with an area of 650 hectares, this allowed saving 199 cubic meters of water in two weeks. Fatty alcohols are considered non-toxic and do not spoil drinking water (at least in the concentrations used).

However, the long-term environmental impacts of using the Canadian method have not yet been studied. It is possible that a decrease in evaporation will lead to a heating of the water mass. The film can reduce gas exchange between water and atmosphere. Both will affect the organisms inhabiting the reservoir.

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