POWERED BY FLASHLIGHTDuring the experiments, building various electronic projects there is often a need for a DC source of relatively high capacity. For example, the battery voltage of 4.5 V is composed of three elements of “373.” To do this, you can put them in the original container tape out cut Velocimetry (see “M-K”, 1986, № 4), bonding like candy wrappers, wrapped in heavy paper (“M-K”, 1988, № 6), or dock in a unit with paper capsules-“shirts” from the same items (“M-K”, 1989, № 11). But still to provide a sufficiently reliable contact in such cases is not always possible. That is why many are still doing the old-fashioned way — connect the elements with each other lengths of wire with rations.

However convenient, reliable, ready-made cassette elements are almost everyone. It’s a flashlight. So use them, temporarily turning it into a lab power supply.


Remove the attachment from the reflector and Unscrew the bulb, replace it and fabricate a mating connector X1 for connection to the battery of an external load. To do this, take the blown bulb, wrap in several layers of cloth, pliers, gently crush the cones, and then podaite flexible stranded wire. In the hole of the cap insert (better glue) rubber tube cap, cut out, for example, from eraser. So made a plug to screw into the threaded socket for the bulb, and universal power pack with push-button (SB1) and slide (SA1) circuit breaker ready. It is convenient when checking the motors, suspension models, when you want to repeatedly run drivers. At short inclusions are SB1.


Fig. 1. Diagram of power source.

Fig. 1. Diagram of power source.

Redone this way the flashlight, essentially, will become a simple remote control slow-moving homemade toys and models driven by a low voltage microelectrophoresis DC. And to this panel with the wires had a more attractive and finished appearance, put on the front part of a decorative attachment made of plastic bottle (from household chemicals or detergents) suitable diameter.
Fig. 2. Adapter lamp socket.
Fig. 2. Adapter lamp socket:
1 — wire connection, 2 — decorative nozzle, 3 — lamp housing, 4 — pin base lamp, 5 — rubber tube.

Such a power source is convenient to use when building various electronic projects, including those described in our magazine.
And if you need lower voltage, say 3? It is sufficient to place the element G2 to put an insert made from a piece of wood nailed to both ends of the plates of tinplate cut from tin cans and connected with a jumper wire.
Fig. 3. Insert.
Fig. 3. Insert:
1 — drop of solder height of 1.5—2 mm, 2 — wire connection the jumper in isolation, 3 — disc tin.
As you can see, to make power, without breaking anything in the design of the flashlight, will not be easy. And in case you need to turn it again into a flashlight — a matter of seconds.
E. SAWICKI, Korosten, Zhytomyr region.

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