Flashlight powered. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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When experimenting, establishing various electronic homemade products, there is often a need for a DC source of relatively large capacity. Let's say a 4,5 V battery is made up of three "373" cells. To do this, they can be placed in a kind of container-cassette from a segment of the cycle chamber, fastened like a candy wrapper, wrapped in thick paper, or docked into a block using paper capsules - "shirts" from the same elements. But still, it is not always possible to provide a sufficiently reliable contact in such cases. That is why many still act "the old fashioned way" - they connect the elements to each other with pieces of wire using soldering.
However, almost everyone has a convenient, reliable ready-made element cassette. This is a flashlight. So use it, temporarily turning it into a laboratory power source.
Remove the nozzle with a reflector and unscrew the light bulb, and instead of it, make a counter part of the X1 connector for connecting an external load to the battery. To do this, take a burned-out light bulb, wrap it in several layers with a piece of cloth, gently crush the cone with pliers, and then solder the flexible stranded wires. Firmly insert (preferably with glue) a rubber plug cut out, for example, from an eraser, into the hole in the base. Screw the plug made in this way into the threaded socket for the light bulb, and the universal power supply with push-button (SB1) and sliding (SA1) switches is ready. It is useful when checking the electric motors of the undercarriage of models, when it is necessary to repeatedly start the drive mechanisms. For short-term inclusions, use the SB1 button.
Rice. 1. Power supply circuit
A flashlight converted in this way, in essence, will turn into the simplest control panel for slow-moving home-made toys and mock-ups driven by low-voltage DC microelectric motors. And in order for such a remote control with wires to have a more attractive and finished appearance, put on its front part a decorative nozzle made from a polyethylene bottle (from household chemicals or detergents) of a suitable diameter.
Rice. 2. Adapter from the lamp base: 1 - connecting wires, 2 - decorative nozzle, 3 - lamp body, 4 - lamp base, 5 - rubber plug.
It is convenient to use such a power source when setting up various electronic homemade products, including those described in our magazine.
What if you need a lower voltage, say 3V? It is enough to put an insert in place of the G2 element, made of a wooden block with tinplate plates nailed on both ends, cut from a can and interconnected by a wire jumper.
Rice. 3. Insert: 1 - a drop of solder with a height of 1,5-2 mm, 2 - a connecting jumper wire in insulation, 3 - a tin plate.
As you can see, it will not be difficult to make a power source without violating anything in the design of the flashlight. And if necessary, turn it back into a flashlight - a matter of seconds.
Author: E.Savitsky, Korosten, Zhytomyr region
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