Sometimes the output current in the power supply can be increased up to a critical value (due to the increase of power consumption, faulty connections or load devices), which will inevitably lead to the accident consequences of overload can be significant and even irreparable if you use a power supply without the security host (like today often make hams, making simple sources and buying cheap adapters) for Example will increase power consumption, can lead to failure of network transformer, it is possible to separate fire elements and odor.DROPS ON THE TRANSISTORS
How nice to fall asleep to the rhythmic roar of the rain, as the happy jingle of the spring thaw! But should we depend on the vagaries of nature, when all you can hear at any time at home. It is enough to make a simple electronic device, based on a well-known multivibrator. Changing the Read more…
The device is assembled on the proposed scheme allows to control the power consumed from the DC voltage source. Indication power led is a color display and sound. When using in-vehicle device control the power consumption of lighting devices and additional equipment replaces the voltmeter, connected in parallel with the battery.
The temperature of the soldering iron usually adjusted using Later. However, such devices are bulky, inconvenient for transportation. Significant benefits in this respect have electronic regulators. Thyristor controller — scheme presented in figure 1 — changes AC voltage at the electric soldering iron with power up to 50 watts 110 to 220 V.
“Ah, summer red, I would love you, if not for the heat, and dust, Yes mosquitoes, Yes flies”. And although the high poetry of the great poet little combined with the dry prosaic lines, technical articles, these words can be safely put as the epigraph to this material. To stop the change of seasons in nature is impossible, and every year we have a “happening” summer, and with it come the usual worries of relief and localization of negative emotions, invariably manifested in humans with the appearance of annoying flying insects — mosquitoes, flies and other midges. To protect yourself from them, in nature and even at home someone buys a mosquito net, others treat themselves and family members with special insect repelling creams and formulations. However, possessing the skills, you can build a simple circuit protection device against mosquitoes, operating by using of ultrasonic radiation. What is ultrasound?
In Amateur practice it is often required to provide an audible alarm, activated when the lighting of any object, the device responds to sudden illumination luminous flux working (photosensitive) surface of the photoresistor.
Probably you are familiar with simple electrical device for training “the steadiness of the hand” — a metal panel with a narrow winding slot, along which, without touching its edges, it is necessary to hold the pivot-pin. One careless touch probe to the edge and flashes the warning light. Such devices form the basis of the various attractions and special equipment. This principle is valid for our slot machine.
Electromechanical meters (hereinafter — meters) are used in industry to control the state (account) and hold the value of any device. Whenever the effects of a constant voltage to the coil (inside the housing of the Electromechanical counter) is changing its digital readings on one. This is achieved by using a winding with the armature, which, in turn, acts on the lever spring retainer, holding the counter wheels bearing digits. The control winding is a direct current. With each exposure to the appropriate stress occurs only one pulling and one releasing of the armature coil of the counter.
Did you know that at the time shortwave Amateur radio communication, uniting hundreds of thousands of people in almost all countries of the globe, was to some extent the prototype of the Internet and current provider? In particular, short wave periodically going kind of forums (then they were called “round tables”), which discussed mainly technical issues related to the design of short-wave equipment and the passage of radio waves. On short waves to new friends and keep in touch with old And just this would need a homemade radio transmitter power from 10 to 40 watts and the HF-receiver. A thin “thread” of human relationships extends directly from one user to another without any intermediaries or service providers, without fiber and satellite communication and mobile phone companies.
Electric circuit “call” usually with a tester or device with audible indication. The probe, about which we talk today, informs about the health of an electric circuit with a light signal. He exhibited at the 29th all-Union exhibition of creativity of radio fans-designers. With such a device it is easy to find broken or short-circuited sections in strings and cables, checked relays, resistors, capacitors, fuses, light bulbs, determine the status of the p-n junctions for diodes and transistors. An indicator is a miniature light bulb, for example, CMH10-50.