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Pipe Bomb

The document describes the design and construction of a prototype electronic musical instrument made from a PVC tube. Key details include dimensions of 36cm long and 5.5cm diameter, using a telephone speaker and crystal microphone. Feedback is dampened with foam rubber and an old sock. The instrument produces a high pitched tone that can be modified by changing the tube dimensions or materials. It functions like a fuzz pedal and adds overtones and reverb to guitar sounds.

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Pablo Espinosa
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839 views1 page

Pipe Bomb

The document describes the design and construction of a prototype electronic musical instrument made from a PVC tube. Key details include dimensions of 36cm long and 5.5cm diameter, using a telephone speaker and crystal microphone. Feedback is dampened with foam rubber and an old sock. The instrument produces a high pitched tone that can be modified by changing the tube dimensions or materials. It functions like a fuzz pedal and adds overtones and reverb to guitar sounds.

Uploaded by

Pablo Espinosa
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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THE

BOMB
PVC Tube X long by Y diameter

amp2 OUT
IN amp1

Crystal Mic

Telephone Speaker
My dimensions for my prototype are X= 36cm, Y= 5.5cm. This imparted a pretty high pitch tone but I like it.
The X and Y dimensions should be played with to create the exact tone your looking for, also I chose a telephone
speaker and a crystal mic so I got the funkiest tone I could think of. A dynamic mic would limit the trebel somewhat
probably make it sound less harsh. Id be interested in any mods made to this design (ie. stories, ideas, etc.) so feel
free to email me. The amps can be any old simple op-amp configuration that can drive a speaker or take a mic input.
I just used some surplus stuff I had lying around to make mine. The end product had all the circuitry inside the tube and
the battery on the outside, with one control for the gain of the speaker (mic was at fixed gain). Note, if you place
this infront of your amp and turn every thing up, without adding any dampening to the tube it will feedback like you
wont believe! You will probably wish to avoid this as it tends to hurt your ears. I put a bit of foam rubber in one end of
the tube and an old sock in the other to dampen feedback. I like to leave my options open though, so I also didnt make
this a permanent addition. My prototype is basically a fuzz, as my guitar will overload the speaker quite easily and the
tube just adds a bit of strange overtone and what I swear is the tiniest hint of reverb. Sounds great though! Clean tones
through a similar set up would sound good too, but I havent built one of those yet. Perhaps a larger speaker (4-5") and
an old carpet tube would add better characteristics for clean tones. Try changing the tube matierial also for a different
tone, I almost used a bit of gutter piping when I first built this, now I wonder what it wouldve sounded like.

Jamie Heilman 11/93


n9343176@cc.wwu.edu

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