Himself an electrician

LASER SHOOTING

27.05.201813.05.2018Himself an electrician

Popular infantile pastime became now the so-called laser (light) pointer. Produced as a miniature working tool for teachers, lecturers and guides, it attracts the daring fans of science fiction an opportunity to play “the hyperboloid of engineer Garin”, highlighting the highly directional light beam of a particular item of interest at a considerable distance.

ON HEADPHONES

27.05.201813.05.2018Himself an electrician

Currently on the market are a large number of active speakers for PCs but speaker sound quality is at least not lower than 15 ° C, to many can’t afford. The vast majority makes the choice in favor of cheap small speakers, the sound of which quite corresponds to the price, but…

LASER PHONE

26.05.201813.05.2018Himself an electrician

Materials about the specific features and infinite possibilities of lasers, including semiconductor, have been published in the journal “modelist-Konstruktor” (for example, No. 8’2001). Told also of how to adapt widespread laser pointer (LU) in a homemade optic dash, where it emitted the light pulse performs a function of photon bullets (see “modelist-Konstruktor” No. 12’2001). It was stressed that luminescence intensity and a number of other physical parameters LU depend on the voltage applied to the laser led.

RELAY PROTECTION

26.05.201813.05.2018Himself an electrician

Voltage instability in the regional power lines, unfortunately, are not so rare. Especially during strong winds, when the wires of overhead lines of 0.4 can overlap. Because of the suffering of electro-, radio – and TV equipment, included in the housing network, where the voltage can suddenly become equal, say, 100, or Vice versa, 350 V. However, for my appliances I have five years did not worry, as the anomalous voltage in the network it protects a homemade relay system.

SVETOOPTIKA! ANY!

26.05.201813.05.2018Himself an electrician

Most machines of lighting effects (AES), including homemade design for the decoration of discos, Christmas and other holidays (see “modelist-Konstruktor” No. 4 and 5 in 1995), can at best give only a reprogrammable combinations of light. Even with all the variety of used circuit design, these devices usually can not at least in a time interval arbitrarily change the order of playable effects and patterns. I offered as my development devoid of these shortcomings.

ANTENNA IN HASTE

26.05.201813.05.2018Himself an electrician

Anyone who at least once in a lifetime chance to deal with wires, you can make original TV antenna (Fig.1) no worse than industrial zigzag.

The idea of this simple device I made in the years of his student life. The antenna was so successful that they continue to use it. The familiar “spread”, and they liked the design, which was given the name “Student”.

FUSE-“PHOENIX”

25.05.201813.05.2018Himself an electrician

Overcurrent, short circuit for power supply… To protect against this scourge in the apparatus used old world as the means of fuses. Some are mounted in a special cartridge-holders, others are soldered in the circuit Board that simplifies the design itself, but complicates the replacement of burned out “inserts” healthy.

BATTERY — 220!

25.05.201813.05.2018Himself an electrician

Nowadays there are cases of power failure. In such a situation, can save the emergency power supply. For example, from a car battery with a homemade voltage Converter 12/220 V. Saw: stock power is enough for several hours of modern television, the lighting of the lamp or other appliance with power up to 100 watts. The maximum current consumption from a battery does not exceed 11,5 A.

SIZE ADAPTER “CROWN”

25.05.201813.05.2018Himself an electrician

When you turn on the power source smoothing capacitor C1 is gradually charged via the resistor R4, serves to protect the diode bridge VD1 overload. There is a voltage at the output of the trigger divider. Due to the fact that it affects the resonant circuit, consisting of transformer T1 and capacitor C2 in the secondary winding II is induced EMF from the pulse, the power of which is sufficient to switch the transistor VT1 is in the saturation state, although the initial moment of time the current through this semiconductor triode is not due to the self-inductance of T1. Then starts to do the “addition” from the winding II, holding VT1 is in the fully open position.

THE HEAT IN THE HOUSE

25.05.201813.05.2018Himself an electrician

If you want to have in the house and other buildings efficient heating and cleanliness, you can always use the electric-powered three-phase network with voltage of 380 V, both independently and in conjunction with a boiler for solid or liquid fuel.