Induction coil, in the last century invented Rumkorem, and is now used in experiments in physics. But now it is not fully satisfy the requirements of physical experiment creates interference, does not regulate the high voltage. consumes battery power, and feed the coil directly from the mains AC is impossible. We offer you to equip physical classrooms modernized version of the instrument developed on the basis of electronics.NEW OLD COIL RUHMKORFF
Induction coil, in the last century invented Rumkorem, and is now used in experiments in physics. But now it is not fully satisfy the requirements of physical experiment creates interference, does not regulate the high voltage. consumes battery power, and feed the coil directly from the mains AC is impossible. We offer you to equip physical classrooms modernized version of the instrument developed on the basis of electronics.
There are many games in which, for example, the number of points scored by the player. is determined by throwing dice. It is easy to make and the electronic “dice” random number generator. Schemes of such generators and descriptions found in Amateur radio literature.
Compression, and adsorption refrigerators often fail due to the fact that they denied Electromechanical relays or breakers on the basis of the bimetallic plates. The first of them is used to trigger synchronous electric motors, serving a compression refrigerator system, and the second are the basis of the tracking systems and maintain at a predetermined temperature level freezer [1]. The reason for failure and the other is a burnout or a mechanical failure of the spring contacts in these devices. Ego especially applies to older models of refrigerators. And often you can see that, because of the insignificant, but hard to handle breakdowns (due to the lack of spare equipment) the throw is still quite usable machines. In the material made the attempt to remove such faults in household appliances.
It often happens when someone from the household forgets to turn the lights off in the toilet — he may be there without the use of a lot of hours. A simple automatic device which, when necessary, turns on the light in the bathroom, and when not — turn off. The electrical circuit of such device is presented in figure 1. It contains: a low-power transformer T1, rectifier VD1 — VD4, filter capacitor C1, two limit switches SB1 and SB2 relay K1. How the device works and how it performs its functions?
A simple power control of the load can be made from industrial phase speed controller electric BUE-ЗВР1. This device has small dimensions 50×55 mm, excluding handles and a reversible switch. Its purpose is to regulate the speed commutator AC motors.
Old things can be treated differently. For someone this “junk” is worthy only of the dump. But if we threw out less garbage, you see, and the ecology of the planet would not be so depressing. During regular maintenance the hostess decided to change the chandelier, and no amount of persuasion that it can be restored, didn’t help. One argument out of fashion. But to throw out the lamp I did not. Adding diffusers and associated parts, hid in the far corner of the pantry. We had to wait long.
Had dinner, turned on the TV and settled down on the couch by the light of an ordinary crystal chandeliers. Light bulbs and the chandelier sparkle and hurt the eyes, the screen “flashes”! Even one bulb is stopping! And no background light color TV to watch harmful to the eye. Had to cover the chandelier with a paper sheet. Watch TV easier, but it’s not the way out, and fire safety is thus broken! Maybe buy a table lamp, noble lamp, can light a candle. Each option has its pros and cons.
Due to the constant rising costs of utilities, including electricity becomes relevant and economical expenditure. Electric lighting in non-residential premises (e.g., closets, utility rooms, etc.) required most often for a minute or two to take out something you need or Vice versa — to put for safekeeping. But to turn off the lights often forget, and the bulb continues to burn without the need sometimes until the next visit of the premises.
Among the many toys in the electronics, is able to mimic the sounds of animals, is very amusing. For example, a toy cow, imitating mooing, or a pig, saying, “let’s Go home, I’m hungry!” The first mentioned industrial products, presentable shaped like miniature soft toys (manufacture of our neighbors from China), electronic device emits a sound “mu-u-u” that can be used for a variety of fun devices, adapting a toy, for example, charm signal in the car.
The ham-hams is well known that, to ensure reliable connection in addition high-sensitivity receiver and a powerful transmitter is needed and a well-designed antenna. There are many types of antennas, however, have to limit ourselves to just two or three. And one of them often becomes a quarter-wave vertical pin or, more precisely, its improved version, which in radio is called the Ground Plane.