RELAY PROTECTION

 RELAY PROTECTIONVoltage 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.

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SVETOOPTIKA! ANY!

SVETOOPTIKA! ANY!

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

ANTENNA IN HASTE

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”.

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FUSE-“PHOENIX”

 Fuse

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!

From the battery - 220!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.

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SIZE ADAPTER “CROWN”

SIZE ADAPTER

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.

FOR WATCHMEN — PHONE CALL

In connection with the aggravation of the criminogenic situation in the country is increasing the demand for security devices. In accordance with the laws of the market grows offer electronic guard for every taste (often with a predominance of the most sophisticated circuitry). Representatives of different companies vying to convince you to purchase state of the art microprocessor designs, the caller is automatically its owner to work or service in the attempts of the attackers to disable the security system and break into the safe house (a dacha, garage). Only here the prices “bite”. And where is the guarantee that replicated the electronic trickery you will not find criminal Kulibin?

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LIVE SONY, AND KODAK

COME TO LIFE, AND SONY, AND KODAKProfessionally working with imported cameras and digital cameras, sometimes have to face the fact, as in the most interesting moment of the shooting suddenly denied regular batteries, which leads to the loss of unique videos and photos. Not wanting to put up with such things, many owners of such equipment have several CD-batteries for fast replacement of “run down” during the filming. But it’s pretty expensive.

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