The 12-volt heater, being autonomous, will help you not to freeze in case of blackout. For heating of all room of its power will not be enough, but at least to warm hands it will turn out.
Instruction
1. As the body for the heater use metal tin from under coffee. It has to have diameter about 10 cm and height about 20 cm. The cardboard can, for example, from under chips, will not approach, as well as plastic or any other material vessel. Drill several dozen openings with a diameter about three millimeters in the body.
2. In day banks drill opening under bracket as which the P-shaped part from metal meccano can be used. Fix bracket, and on its opposite end place bayonet cartridge for automobile lamp from stoplight. He has to settle down precisely in the middle that the lamp did not concern walls banks.
3. In sidewall drill opening of the increased diameter. Insert the sleeve from the isolating material via which pass two-conductor cord with a section not less than 1 sq. mm into it. Connect it to the boss. Screw the 25 W 12-volt lamp in cartridge.
4. Close cover banks. Turn on the 2-ampere safety lock in rupture of cord. In advance charge the normal automobile accumulator in the aired room, using the standard charging device. If it long is not used, periodically recharge it. As soon as during the cold period turn off power supply, connect the self-made heater to the accumulator. It will be warmed approximately in ten minutes. You do not hold on it hand too long not to burn (remember how are heated about heating radiator: hold hand while she suffers heating, then remove, and after a while bring again). You do not hold the switched-on heater near flammable objects, do not use it in the atmosphere of combustible gases and suspensions.
5. Periodically control accumulator voltage the voltmeter. If it falls lower than 10 V, immediately switch-off the heater, otherwise the battery can is irreversible to fail.