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  1. taxrelief

    Convert 12 VDC power to 12 VAC

    Inverter schematic that looks pretty good: http://www.uoguelph.ca/~antoon/circ/555dcac.html Great background info with scematics: http://www.national.com/an/AN/AN-556.pdf What size is the motor?
  2. taxrelief

    Floor joists, header splice, old house

    Would I assume that the double header (transfer beam) is a cantilever beam to make the calculation? The load for the 6' x 16' section 14 psf dead + 40 psf residential code live load (54psf total). Would the plywood be 8' x 3' in two sections, with 1/8" expansion space? I'm not sure how the...
  3. taxrelief

    Floor joists, header splice, old house

    Floor decking is 1/2" Plywood (1970 era) Full length joists are 15'10" x (2" x 10") Sliced Joist are divided midway @7'10" Joist spacing from stairwell is: Full joist @ 0", 6', 6'6", 7'10", 8'2", then 16" oc. Spliced joists are sistered to full joists at 0" and 6'. Spliced joists are also at...
  4. taxrelief

    Convert 12 VDC power to 12 VAC

    For 15 dollars at Walmart, you could get a 70W inverter at 120 VAC. Do you need to step it down to 12 VAC? Or is this a class project? :-)
  5. taxrelief

    Floor joists, header splice, old house

    I have come across a strange configuration in my first floor joist layout. 1) The joists on each side of the basement stairwell are not doubled. The stairwell parellels the floor joists. 2) Four joists parallel to the stairwell on one side are connected midway to a perpendicular doubled header...

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