(Four steps to excellence). 1. Noise reduction (background with a frequency of 50 Hz). In parallel, each diode in the rectifier of the AC power supply (PS) located in the body of one of the speakers, connect a non-polar capacitor type КМ6 (or similar) with a capacity of 0.01 microfarads. In addition, the parallel output SP to filter the background set compact electrolytic capacitor HITANO company with a capacity of 3300 UF at a working voltage of 25 V is ineffective capacitor 1000 UF. These simple improvements reduce background noise with a frequency of 50 Hz present in the cheap versions of the speakers made in China.SPEAKERS PC WILL BE BETTER
(Four steps to excellence). 1. Noise reduction (background with a frequency of 50 Hz). In parallel, each diode in the rectifier of the AC power supply (PS) located in the body of one of the speakers, connect a non-polar capacitor type КМ6 (or similar) with a capacity of 0.01 microfarads. In addition, the parallel output SP to filter the background set compact electrolytic capacitor HITANO company with a capacity of 3300 UF at a working voltage of 25 V is ineffective capacitor 1000 UF. These simple improvements reduce background noise with a frequency of 50 Hz present in the cheap versions of the speakers made in China.
Photoswitch is a widespread element in various automatic systems, protective devices, meters, etc. depending on the tasks the system is triggered by a photocell can be made instantly (for example, the turnstile in the subway), or via a predetermined gap (the Elevator doors). And in some cases rapid changes in illumination is necessary to analyze the situation and prevent deployment if it turns out to be false.
A good host in the winter and enough work in the garden. One day, when the snow piled very much, it was necessary to compact around trees, and roofs of the buildings do not interfere with cleaning. So I went on “zaporozhtse 966В” to see his “estate”. Well in the winter in nature, but deserted. The house has electricity, furnace fun crackling wood, warm and cozy. Having stayed at the site for two days, I decided the next day early in the morning, while cars on the road a little, to go home. In the morning I sat behind the wheel of his “foreign cars”, and the engine will not start battery is dead. And there’s no one around. Neither “light” nor “pull” there is no one to get between the necessary.
In Amateur practice when developing or establishing a device is often required to connect to it a certain load and still it is necessary to measure its output parameters. This scheme allows you to connect your device to one of 22 different loads the Connection of a load is either a permutation of the jumper plug into the corresponding socket, or by using two app switches the type of the EGP on 12 position Device P1 allows you to control the load voltage in three ranges to increase the accuracy of the measurement Device P2 monitors the current flowing through the load Resistors is desirable to have a capacity of at least 10 watts, C5-16, etc.
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.