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Project 32 Hissing Gas Container
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Here is a project that is guaranteed to make even the most hardened skeptic wonder if they should laugh or turn and run This effective little gag is strikingly realistic looking and sounding, yet 100 percent harmless The hissing gas container is exactly what its title implies, but instead of any
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pressurized gas leaking from the container, we will just feed a piezobuzzer with some high-pitched white noise The result will be what sounds like a spray can letting off its contents By placing the piezobuzzer inside the container, it will sound extremely convincing I don t know about you, but if I walked into a room that had a hissing container that looked like it contained some high-pressure gas, I would be heading for the hills without a second look! Let s build it! You will need a piezo element (refer back to 2 Truly Annoying Devices for a detailed description on these), a few basic electronic components and a container that looks as though it could contain high-pressure gas or liquid It will also add to the effect if the piezo element can fit inside the container so that even the closest inspection will make it seem as though the hissing sound was actually coming from the container s opening The perfect container for this project is a metallic thermos or water bottle, since these look a lot like small high-pressure cylinders, and offer plenty of room to insert the electronics In a pinch, you can cut away the bottom of the container to install the guts, but if they fit directly into the container, then the final product will look more realistic Figure 7-22 shows the top of my spun aluminum water bottle with just enough room for the piezo element, 9-volt battery and small circuit board to fit inside To make a sound like a hissing gas leak, we will need a source of white noise White noise (like the sound of an unused section on the FM radio band) is a combination of all possible frequencies at random intensity levels The sound of ocean waves is a good example of white noise The circuit shown in Figure 7-23 will generate white noise, which is fed into the piezo element so that only higher frequencies are given off, making a sound very much like a hissing gas leak The odd-looking circuit shown in Figure 7-23 seems to contain an error, since the collector of transistor Q1 is not connected to anything and the emitter is hooked up backwards Well, this is no error, and it exploits a little-known fact that the reverse-biased emitter-base
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Project 32 Hissing Gas Container
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Figure 7-22 Find an appropriate container to contain the parts
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junction of a common NPN transistor will provide a good source of white noise This noise signal is then amplified by transistor Q2 and then fed into the LM 386, 1-watt audio amplifier IC to produce a strong output to the piezo element You could actually use a small speaker instead of the piezo element, but the hissing will not sound as authentic owing to the lower frequencies the speaker will pass Go ahead and put the circuit together on your breadboard so you can test component values and audio output Since we are forcing Q1 to do things that it s not really designed for, some fiddling may be in order to produce the best sounding white noise I found that common 2N3904 transistors worked well, but feel free to try any type you may have laying around your junk pile Another thing you may have to mess around with is the values of C4 and R5 If you find the white noise sounds too synthetic, then try some other values, or even add another 22M resistor in series with R5 The white noise should sound like a fresh bottle of pop hissing as you unscrew the lid, not like an audio oscillator gone bad When you do have your white noise hissing brilliantly, reassemble the circuit on a bit of perforated board that is no wider than your 9-volt battery so the entire unit can fit through the opening of the container Figure 7-24 shows my completed circuit board ready for installation
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