No matter how small portable power supply network of the car — the weight is nevertheless solid. Very rare, but it will let you know when the battery it is necessary to remove, transfer, charging or replacing a new one. Yes and no handles: case like and does not provide for such operations. Pattern Luggage straps here such device, and to transfer the battery will become easier. Belts can be canvas, synthetic leather or a strip of metal from containers, with loops on the ends or annular.
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The device is useful for a model fire truck and a guard system. The intervals between the signals and their duration is controlled by changing values of electrolytic capacitors C1, C3,...
IF THERE IS NO NEEDLE
If you do not have a special needle for inflating nipple of a volleyball or soccer ball, take advantage of... ordinary medicine dropper with an elongated spout. Rubber part is a bit cut...
