Accumulator for imported video camera. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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Working professionally with imported camcorders and digital cameras, sometimes you have to deal with how, at the most interesting moment of filming, regular batteries suddenly fail, which leads to the loss of unique video and photo frames. Not wanting to put up with such oddities, many owners of such equipment acquire several compact batteries at once to quickly replace those that have run out during filming. But it's quite expensive.
Meanwhile, there is another way out of the situation. It consists in using alkaline or sulfuric acid batteries of domestic production - unpretentious in operation and well known to every motorist. True, the voltage at their terminals is 12-24 V, but it can be easily and without much loss can be lowered using, say, an electronic stabilizer.
Indeed, for a Bop video camera, Upit = 8,4 V at Ipit = 1,5 A, and for a Kodak digital camera - 5,1 V and 2 A. Based on these values, everyone is able to assemble a small device that guarantees receiving from our 12- or 24-volt batteries for the required voltages and currents. The device can be made in the form of a compact unit in two versions: on an analog microcircuit with a pair of high-capacity capacitors or as an electronic stabilizer on transistors.
As a case in any of the variants of such a block, a plastic box from the Agat mechanical stopwatch is suitable. On one of the side walls, two threaded terminals are easily placed for connecting "+" and "-" batteries, and on the other - a connector for connecting to a video camera or digital camera.
Especially convenient is the use of a home-made voltage stabilizer with an alkaline battery 10NKGTS-3,5-1. The capacity of this 12-volt power supply is enough for 3,5-4 hours of continuous operation. A small total weight (885 g) and quite acceptable dimensions (180x120x70 mm) allow you to carry this design in a small shoulder bag.
Schematic diagram of options for a home-made voltage regulator with a microcircuit (a) or transistors (b). A simple and reliable source of stabilized power for video and photographic equipment based on a car battery (click to enlarge)
Undoubtedly, the use of a home-made voltage regulator with a car battery can also be considered successful when connected both directly to the battery terminals and through a power outlet or "cigarette lighter". A wire 4-5 m long is enough for relatively free movement near the car and capturing the environment or a place of rest. You can shoot with a video camera and a digital camera by connecting them to the car's on-board network when driving along the highway or during a long car park, without worrying about a possible failure of a regular battery.
In conclusion, about one more advantage of the proposed technical solution - the possibility of connecting video and photographic equipment to this device through a power supply unit with a frayed or, say, burned out power cord. Solder the mating part of the electrical connector to the end of the wire that remains intact and goes to the load, and - please! The reliability of connecting the equipment to the power source in the standard mode through the mains power supply is fully guaranteed.
Author: A.Narvatov
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