Psychologists have long determined that the health of a person, his emotional state during labor or active vacation influenced by the color of the surrounding objects, walls, floors. For example, a greenish tone to soothe, and, conversely, red — toned fruit. This means that changing the color of the background environment, interior, can affect the psychological state of the person, his health. But the color of the interior items — the property is fairly constant, static; to change the color scheme of the room, will have to glue the Wallpaper, repaint the furniture, change the upholstery…
Ham radio
THE SOFFIT IN THE INTERIOR
No matter what the destination nor was the lamp in its package must include the shade or reflector, limiting the dispersion of the luminous flux and directing it to a functionally important area. Hence the increased demand in electronics stores, unusual chandeliers, sconces, floor lamps. And many are taken to make them yourself.
THE LAMP CHANGES COLOR
Yellow, almost sunlight fills lying under a table lamp a book. To read easily and pleasantly; but after an hour and a half, and you notice that colors start to get bored. To rectify the situation is very simple: you turn the handle-regulator, and color light changes gradually. From the solar spectrum, you can choose any — from red to dark blue, and you can change not only the colour but also its saturation.
EXTENSION CABLE-CARRYING
At home we often have to work with electrical tools and appliances (electric, eletronica, furnace, etc.) at a considerable distance from the outlet. And if the extension wire has a greater length (>25 m), it becomes difficult to unwind, to reel and store.
“WATCHMAN” OF THE CAR
What motorist don’t care how secure your vehicle against theft or intrusion by unauthorized persons? Here, as a rule, comes to the aid of electronics. However, most electronic devices designed for protection of vehicles, often complex and expensive; moreover, they often need isolated from the body of limit switches. This limits the wide application of such “watchmen” motorists.
FOR BIPOLAR TRANSISTORS
This device whose description was published in the journal “Funkamateur” (GDR), used in various measuring devices or equipment, where necessary intermittent light or sound alarm. Moreover, the load can be connected both with the positive and the negative pole of the power source.
THE TIMER CONTROLS THE SOUND
The device, whose scheme is published in the journal “Popular electronics” (USA), produces a positive pulse when a sound (for example, firing of the gun) reaches the microphone B1 (see diagram). The variable resistor RZ adjust the sensitivity of the instrument, and the led V4 indicates it is turned on. Break contact S1, the finish associated with a ribbon, breaks the supply circuit of SCR V5 as soon as the athlete crosses the finish line.
WHAT’S THE HURRY, HANG GLIDER?
The gliders don’t need to explain how important the safety speed indicator. Such a device is especially valuable for beginners: its tip in a timely manner saves the pilot the novice from fatal errors in the management of the aircraft. In hang gliding, apply sound speed indicators. Our magazine has already told about similar designs (see “M-K”, No. 3, 4, 1982, “the Speedometer on a hang glider”).
ELECTRONIC DISCONNECT SWITCH
Many motorists in a hurry to install in your car the so-called device to turn off the “masses” with which, without removing the terminals, the battery easily detaches from the electrical outlet. Nothing difficult here — just need to buy at the store is one of the commercially available mechanical switches and secure it in a suitable place under the hood. Is and switch the RAD-1 remote control, which will save you from having to open the hood. It is true that the control device remains under tension, and to disable the “masses” directly from salon of the car there lay a long negative cable and drill the hole in the cowl panel.
RADIO MIC
We are talking about miniature and low-power VHF transmitter that operates at a distance of only a few tens of meters. The contractor, using a wireless microphone, can move freely around the stage and even down the hall, not being tied to a long cable with amplifying equipment. Sent by the wireless microphone signals taking on a normal VHF radio range. Then, if necessary, enhance them with powerful uzch and reproduced through loudspeakers.