Detector radio. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Detector radio. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / radio reception

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This is the simplest and very first radio receiver. It consists of an antenna and ground connected to an oscillatory circuit of the coil L1 and a tunable capacitor C1, a diode detector on the diode VD1, a low-pass filter formed by C2 and the resistance of the headphones BF1, and the headphones themselves.

Detector radio

The peculiarity of this radio is that it does not require external power.

See other articles Section radio reception.

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Smartphone and breakfast with flame retardants 23.12.2018

Researchers from the University of Toronto studied the composition of organophosphorus flame retardants that have entered the human body and compared them with possible sources of pollution. The results were quite interesting: it turned out that the substances found on the test subjects' mobile phones best correspond to the fire retardant metabolites found in the urine samples of the experiment participants.

There are two possible explanations for this unusual fact. On the one hand, the smartphone itself is capable of being a source of fire retardants, which are released from the plastic parts of the device case. Taking a smartphone in hand, say, while eating, we thereby bring some of these substances into the body.

On the other hand, the phone can act not only as a source, but also as a kind of mirror of what, roughly speaking, gets into our mouths. Since we hold a smartphone in our hands for quite a long time, all those substances that get on the skin of our hands from contact with various plastic objects end up on the surface of the mobile device.

Of course, it's all about the amount of substances, and it's not so much the fact that fire retardants get into the body that matters - we still can't be isolated from the environment - but their number. Therefore, from the fact that you hold a smartphone in your hands, and then eat an apple with the same hands, nothing terrible will happen - you should not hit chemophobia and run away from any plastics like from fire. Nevertheless, washing your hands before eating and not eating every day, without letting go of the gadget or sitting at the computer, in any case, will be more useful.

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