» MAKE: NOISE — Discuss this article

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• 9/16ths Drill Bit
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  HomeDepot and Lowes don't seem to have them. Any other places I might check?

  Posted by helldaemen on June 15, 2011 at 16:20:50 Pacific Time

• Pipe material question
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  If this is the wrong Place I am sorry. I would like to know if is could us galvanized steel. I am assuming no but is is so much cheaper than the other options around me.

  Posted by sjstuder on June 09, 2011 at 18:18:16 Pacific Time

• Alternatives
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  On the speaker, an elegant solution I found other than the witch hat was to purchase a 4"x2" pvc reducer and cap (make sure it's one for a fitting and not for a pipe) that fits over the reducer. I drilled out two holes for banana plugs, throwing in some flexible glue similar to hot glue to seal it. I put in a 4" speaker (bending back the mounting bracket slightly to fit, wired it, soldered it, and closed it in (sealed with pvc cement). A very small section of 2" pvc pipe is needed to marry to the conduit with a end-to-end clamped connection. Use a rigid type with a piece of tempered metal around the rubber part. On the stand, I just used a plumber's hole saw in a painted section of 2x8. I loved the idea for ptc fittings and tapping the sides with the 3/8" NPT, worked beautifully. (although my natural gas leaks through this when turned up high). Finally, replace the helium balloons with a $3 cap and clamp on the non-speaker side. My speaker setup was sealed, so no cap needed on that side. Your speaker needs to be amplified and not from a headphone jack; the 1/16" holes may need to be enlarged (slightly) for natural gas pressure in a science classroom. Thanks for this article!!! I've been scratching my head over this for years.

  Posted by MrHagstrom on April 28, 2011 at 11:45:08 Pacific Time