My thyristor voltage regulator (THREE) is easy in manufacture and adjustment, linearity regulation and high power output — 200 watts without heatsink and 1000 watt radiator cooling area 50 cm2.
A variety of machines are used to evaluate sports competitions. Automatic light displays have become commonplace at hockey games and at competitions of figure skaters and boxers, weightlifters, and gymnasts. It is usually complicated electronic device.
Take a look at the placed on the fourth page of the cover. It would seem that the similarities between these fun figures and radio? However, a question may ask the inexperienced reader, but for the guys from the Moscow Palace of pioneers there are no secrets: inside each colorful souvenir — detector receiver. For example, this tiny doll made by Vladimir Trusov, takes the radio station “Mayak”, operating on the wave of 547 m, and “Lunokhod” Yuri Kozyrev— long-wave radio station on the wave of 1734 m.
In recent years, widespread integrated circuit, which is a nearly complete unit (amplifier, radio or audio frequencies, a detector, etc.) or radios in General. However, for all its appeal (especially for mass production of narrow-purpose machinery) excessive specialization of IC circuit is devoid of flexibility and impedes the solution of diverse tasks assigned to the electronics. Report that and produced a huge number of more versatile chips, the so — called operational amplifiers (op-amps).
In the age of microelectronics, computerization and display multimeters gauges perceived by some almost as an anachronism. However, life proves the fallacy of such views.
It is known that in the process of operation of car batteries is required from time to time to do preventive charge-discharge cycles to prevent sulfation of the plates and thereby increase their service life. There are lots of devices, including homemade (see the journal “modelist-Konstruktor” No. 9— 11 ’01), through which the battery is initially discharged to 10.5 V with a current of 1/20 of its capacity and then the voltage on the terminals is communicated during the charge-discharge cycle to 14.2 to 14.5 V. And the ratio of the charge-discharge current components are in the majority supported almost perfect — 10:1, and the pulse durations of the charge-discharge — as 3:1, but…
Busy with household chores or interesting conversation, we forget, for example, on a boiling kettle. Time to remind him maybe a simple buzzer. However, the oscillators sound frequency (e.g. multivibrators) based on transistor logic or integrated circuits do not always meet their creators. The simplest devices give a smooth tone, barely visible against the background of everyday noise, and sudden and loud “beep-beep” of a more complex designs can scare.
We offer homemade household heat stabilizer can be used in incubators, dryers, fruit, mini-greenhouses etc. From existing analogues it is original schematic construction, maintaining the temperature with an accuracy of ±0.1 °C, tolerance with fluctuations in the AC 160 to 240 V, and can operate from a DC source with voltage up to 310 V. the Power regulated heater element can reach 750 watts.
(The end. Start at # 1 ’03)
needed for anyone who is keen on constructing of measuring equipment and equipment for radio control models. Simple circuit universal wavemeter, shown in figure, is a conventional crystal radio set, whose output is headphones included the arrow measuring device ИП1 with the DC amplifier transistor T1.