Depressing statistic of the attacks on the secrets and the assets of the firms, organizations, entrepreneurs (and ordinary citizens) makes it necessary to take appropriate countermeasures, in particular, to acquire security devices and even systems. The proposed technical solution is one of them. Responsive to the appearance of outsiders (outsiders) in a protected area, this electronic guardian offices, apartments, warehouses and other premises in my own way belongs to the rightful owners and employees have “radiolocate” in the form of trinkets.
IN THE OFFICE — A STRANGER!
You love music, but not always have enough time and opportunity to go to the Opera or attend a concert. However, modern high-quality instrument sound allows you to “go” at the concert of your favorite artist and comfort of your own home. But before you buy such equipment, you need to know what requirements it must meet.
Currently, it has become fashionable household electrical lamps with shades. The publication describes this decoration to the lamp, which is easy to do it yourself from simple materials.
Enough next to your telephone to put a small plastic box, as from the speaker there is a loud voice. The secret here is simple: mounted in the box coil (scheme) “detects” the electrical signals of the phone conversation, coming then a three-stage transistor amplifier with low frequency.
Instruments based on the radio. Technical progress is relentless it forces us to buy all new electronic devices, and old, but usable receivers, tape recorders, record players and tape recorders had moved into the closets and attics, and then to the dump. However, enthusiastic Amateurs on a more careful attitude to an old technique, finding it different application. So old, no one needs a radio superheterodyne scheme can certainly be found almost any Amateur radio.
“Candle” — light bulb with a power of 50-60 watts. “Pistol” — a tube-tube in which is placed the photodiode, and the handle with the trigger button. The photodiode and the lamp are connected through the electronic circuit.
Many designs of metal collected with the use of electric welding. I made this several machines, and one was the most successful and easy to use. I offer welding transformer with electronic current control. It has no moving parts that require a high build quality and vibration. The control unit allows you to smoothly adjust the welding current by turning the potentiometer knob. At the same time all the range of the arc is burning stably. I think this design should be of interest to readers of the journal.
The era of universal shortage has prompted us to create the things in the shops it was impossible to find. However, the era of abundance has not stopped this process. Apparently, a modest domestic work is now subject to other laws dictated by market prices or a passion.
Compact consumer electronic devices gadgets such as watches, alarm clocks, radios, toys, weather stations and other similar devices are available in almost every home. Regularly and everywhere, home owners have to ensure their power supply batteries with a nominal voltage of 1.5 V (“AA” AA and “mizinchikov”, “AAA”) or of the disc type CR, AG, etc. – with a voltage from 1.5 to 3 V. considering the fact that the power supply elements (batteries) are increasing in price (like everything else), the author offers a more rational solution for the cost-conscious owners, namely, to apply to the food in the house and (or) a favorite with owners of devices powered by household electrical outlet using the AC adapter. Thus, the cost for the family budget significantly reduced, since do not have to constantly buy batteries.
There are situations when the lighting is required to manage not one, but two places. For example, when you need to turn on the light when entering in a number of areas on and off when you exit from the common hallway. The situation is similar in terms of covered walkway, tunnel, greenhouses or the like of the long room.