Even the heavy bag or the bag will seem half the size, if you use our advice and make them removable handle. To make it out of plywood with a thickness of 10 -12 mm from the PCB or plexiglass.
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Draw the circuit diagram, weathering adopted the proportionality of graphic symbols electronic elements, it is not as simple as it might seem at first. Great help here can have a stencil...
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When performing masonry great aesthetic importance is the jointing. Use to perform this operation cut tube Ø 10— 12 mm by bending it as shown in the figure.