Being in a camping trip or fishing is always advisable to have a flashlight. The light from an ordinary incandescent bulb is extremely inefficient and requires replacement kits power, which significantly increases the weight of the equipment.
In the evening, settled down for the night after a long hike or a successful fishing trip, after dinner, to relax in the tent but in the darkness somehow uncomfortable, burning electric lamp uneconomical. In this case, will help provide led lamp having a minimum size and negligible weight. With it possible to cover the table during dinner, to illuminate the road, and switching the mode, night light, you can safely leave the tent without causing disturbance to others.
The advantage of lamp is that when low weight it can a long time to work from one set of power. Power is supplied from a single galvanic cell AA when the test was taken the cheapest battery that cost 2-3 rubles. Continuous operating time of the lamp is approximately 20 hours at a constant brightness. The effect of light, is achieved by switching SuperBright led white light to blue. To power the LEDs use a voltage Converter, made by the scheme single generator with inductive feedback transistor VT1 and the transformer T1.
Fig. 1
Pulse voltage is rectified by the diode VD1, smoothed by filter capacitor C3 and is fed through the switch SA2 depending on the selected mode for a super-bright white led HL1 or HL2 blue glow. Instead of the blue led, you can apply orange. Zener diode VD2 is designed to prevent surge during the switch SA2, which can damage the LEDs. The entire device is mounted on the circuit Board of one-sided foil fiberglass thickness 1-1. 5 mm in size 43*35mm.
Fig. 2
The fee is manufactured by well-known technique and after etching in ferric chloride solution trimmed and oblizyvaetsya solder. Primarily in charge set the switches SA1 and SA2, and LEDs, this is because as the body uses the body from mechanism of Electromechanical watches in China. The choice of this building satisfies all the parameters is small size, weight, and most importantly it has cassette for inserting the battery. PCB with mounted switches and LEDs are placed in the casing, pre-cleared acute knife all the tabs and try to highlight the cutouts for the switches and knobs openings for LEDs see photo of finished devices.
Fig. 3
Further mounted on the Board the rest of the details. In the voltage Converter used small details. Type resistors MLT-0,125, electrolytic capacitors import, up to 5mm, with a higher elevation should positioning on the Board horizontally. As HL1 uses super-bright led white light, HL2 blue or orange. Switches SA1 and SA2 at two positions from the old and import of radio equipment. A pulse transformer is wound on a ferrite ring size K10*6*3mm magnetic permeability 1000-2000. Pre-ring stitch on the edges to avoid damaging the winding, it is desirable to wrap the ring with a thin vinyl tape or duct tape. Both windings are wound with a wire PEV-2 in diameter at 0.31-0.4 mm.
The primary winding has 8 coils, 11 and the secondary windings. Pre-transformer podpisyvaetsya Board to the pads and checked the efficiency of the Converter, in the absence of the output voltage, reverse the findings of one of the windings. After you have verified that the transformer is attached to the Board using a hot-melt adhesive.
The assembled Board is inserted into the housing and fluster of power cord. Cost of housing is also fixed by a hot-melt adhesive. The total current consumption of the lamp is - 14-15ma. Operation of the lamp during the summer season showed its efficiency and reliability. For the convenience of placing the lamp in the tent, in a convenient place you can glue or sew a piece of a zipper, Velcro, the same piece is glued to the body of the lamp, easy and reliable fixing.
Fee in the format .lay
Author: I. V. Ankudinov, aiv55 [dog] mail.ru; Publication: www.cxem.net