Himself an electrician

Remember, what is the simplest electrical circuit? The galvanic battery and light bulb connected by conductors through the switch (see the article “Ohm’s law” in the “M-K” N2 9, 1978). If such a circuit connection line length of about 30 cm to bring a compass, its magnetic needle will tend to become perpendicular to the conductor (Fig. 1).

More than two years have passed since then, as I have installed it on your motorcycle “IZH-Jupiter 4” contactless ignition on the basis of voskhodovskogo generator, switch 262 3734 and a homemade diode mixer (Fig. 1.). Making sure the reliable working of my creations, and colleagues conducted such an improvement to your motorcycles However there were questions like, “I drew on your chart — explain why me doesn’t work.”

So, you are already familiar with the electromagnet, knows how to work the buzzer and electric bell (see “M-K” No. 8 this year). But there is a large group of Electromechanical devices, the main element of which is also an electromagnet. It’s the solenoid. That’s how they are.

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.