Now available is a vast assortment of various acoustic computer systems — almost every company that produces computer hardware, supplies the market and the corresponding acoustics. The consumer only has to choose the right system, based on the ratio “price — quality”. But not everyone can afford the “cool” equipment, and at the same time, I feel that the sound was not worse. Well, for homebrew, even a novice, this problem is quite solvable: sound active inexpensive computer speaker systems can be improved independently. For illustration, the author offers a description of the modernization quite common columns SVEN (model SPS-828) made in China.
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In selling there are a number of relatively inexpensive electronic musical instruments (EMI) of Chinese origin that fall within the price category of a toy. However, inherent in their electronics capabilities can reach far enough beyond the “toy”, and the user is often not specified. So, I purchased keyboards AMY SK-4901 (33.e.) the in which includes rhythm programming by the user (it is relatively expensive and quite complex polyphonic child of AMY) TO the user about its capabilities is presented sparingly enough, and in this article provides add-ons to it.
Depicted in the drawing bath is designed for apartments where there are no special facilities. “Hiding” it in a wooden Cabinet, made according to the dimensions of the bath. The box itself is assembled from particle Board with a thickness of about 20 mm, on the outside it is coated with synthetic film “under the tree” and inside: “tile” with tiles.
Almost all users as a stationary radio stations (including those intended for civil radio on 27 MHz), and automobile radios and 4M AM (amplitude and frequency modulation) are faced with the need for optimal coordination of antenna-feeder devices (hereinafter — AFD) with the transmitter. To increase the range of a portable (wearable) mobile stations are sometimes also connected to respective external antenna, for Example, in the CBS range on an antenna called “5/8” vertical polarization and pin around 1450 mm That is the solution of the mentioned problem is important for all radio Amateurs with an active and effective (long-distance) communications.
In our self-similar groups the foam — some of the most popular materials. One day we read in the “M-K” (No. 9, 1977) about the different ways of processing foam. We liked most of the foam cutting hot wire. We did a few of their stanochki and accessories and we offer readers “M-K” is one of them. It’s called “Electrothermal Board cutter”. All the details of it mounted on a wooden U-shaped panel assembled and glued plywood 12 mm. Cutting tool is nichrome wire thickness of about 0.5 mm, sandwiched by two M8 bolts, drilled through by a drill bit Ø 2 mm. Supported by her taut arc spring strip steel with a thickness of about 2 mm, privernuty to the panel with two screws M8.
The unit, working two or three hours a month, can cause at best confusion, and yet well known vacuum cleaner is used in this way useless waiting in the pantry. Having built the design shown in the figure, you simultaneously and make your vacuum work more productive, and will save the kitchen, and the apartment — specific odors.
This device is designed to automatically turn on exterior lighting after dark, and, accordingly, the automatic switch-off at dawn, which is always important, especially in terms of country of residence in order to save energy resources.
The idea of compression of air and practical use of its in new condition not new. Alexander Belyaev in his work “the Seller of air” introduces us to the prospects of this direction. The hero of his works Bailey clutched the air in the balls and kept them at a temperature equal to absolute zero.
