Lamp in the tent with a night light. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Lamp in the tent with a night light. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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While on a camping trip or fishing trip, it is always advisable to have an electric flashlight with you. A flashlight with an ordinary incandescent bulb is extremely uneconomical and requires spare power supplies, which significantly increases the weight of the equipment.

With the onset of evening, having settled down for the night after a long hike or successful fishing, after having dinner, it is pleasant to relax in a tent, but in the dark it is somehow uncomfortable, it is uneconomical to burn an electric lantern. In this case, the proposed LED lamp, which has minimal dimensions and negligible weight, will help out. With it, you can illuminate the table during dinner, illuminate the road, and by switching to the night light mode, you can safely leave the tent without disturbing others.

The advantage of the lamp is that, despite its low weight, it can operate for a long time from one set of power supply. Power is supplied from one AA type galvanic cell; during the test, the cheapest battery was taken, costing 2-3 rubles. Continuous operation time of the lamp is approximately 20 hours at a constant brightness. The effect of a night light is achieved by switching the super-bright white LED to blue. To power the LEDs, a voltage converter is used, made according to the scheme of a single-cycle generator with inductive feedback on a transistor VT1 and a transformer T1.

Tent lamp with night light
Fig. 1

The pulse voltage is rectified by the diode VD1, smoothed by the filter capacitor C3 and supplied through the switch SA2, depending on the selected mode, to the super-bright LED HL1 white or HL2 blue. Instead of a blue LED, you can use an orange one. Zener diode VD2 is designed to eliminate voltage surges at the time of switching SA2, which can damage the LEDs. The whole device is mounted on a board made of one-sided foil fiberglass with a thickness of 1-1,5 mm and a size of 43 * 35 mm.

Tent lamp with night light
Fig. 2

The board is made according to a well-known method and after etching in a solution of ferric chloride, it is cleaned and tinned with solder. First of all, switches SA1 and SA2, as well as LEDs, are installed on the board, this is explained by the fact that the housing from the Chinese-made electromechanical watch mechanism is used as the case. The choice of this case satisfies all the parameters - small size, weight, and most importantly, it has a cassette for installing a battery. The printed circuit board with the switches and LEDs installed on it is placed in the case, having previously cleaned all the protrusions with a sharp knife and cut out the cutouts for the switch handles and holes for the LEDs, see the photo of the finished device.

Tent lamp with night light
Fig. 3

Next, the remaining parts are mounted on the board. The voltage converter uses small parts. Resistors of the MLT-0,125 type, imported electrolytic capacitors, up to 5 mm high, with a higher height they should be placed horizontally on the board. As HL1, a super-bright white LED is used, HL2 is blue or orange. Switches SA1 and SA2 for two positions from the old imported radio equipment. The pulse transformer is wound on a ferrite ring of size K10 * 6 * 3mm with a magnetic permeability of 1000-2000. The ring is pre-turned around the edges so as not to damage the winding, it is also advisable to wrap the ring with a thin vinyl tape or tape. Both windings are wound with PEV-2 wire with a diameter of 0,31-0,4 mm.

The primary winding has 8 turns and the secondary has 11 turns. Beforehand, the transformer is soldered to the board pads and the performance of the converter is checked; if there is no voltage at the output, swap the leads of one of the windings. After checking the performance, the transformer is fixed on the board with hot glue.

The mounted board is inserted into the case and the power wires are soldered. The board in the case is also fixed with hot glue. The total current consumption of the lamp is - 14-15mA. The 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 the fastener, Velcro, the same piece is glued to the lamp body, simple and reliable fastening.

Board in .lay format

Author: I.V. Ankudinov, aiv55 [dog] mail.ru; Publication: cxem.net

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