I have only used 1/2" schedule-40 pipe, so I bought a 3/4" thin-walled tubing. The weaker sides cut with less resistance, offered more internal volume, and were less expensive per foot than standard-duty pipe. I wanted to test if the wider tubes would provide a lower frequency than the same piece in a smaller diameter. I cut 20" (500mm) pieces in both sizes and carved labiums into each.
I started with the larger size and repeated yesterday's testing method with an open tube, partially blocked, capped, then trimming an inch. I jotted down the results until I got to 8" from labium to tip, where the primary frequency and the next most audible resonance fell close to the DTMF tones to transmit a 2. The decoder on my phone confirmed that when I blew on the open pipe, it detected the numeral. I stopped cutting that pipe and set it aside.
When I started the project, I wanted a double-necked flute that could emit any of the sixteen DTMF signals by careful finger placement, but that felt only possible with a lot more work. I would settle for twelve pipes that corresponded with a single character.
8" from labium to end in 3/4" thin-wall PVC acts like the 2 button on a touch tone phone
I continued my experimentation with the 1/2" pipe and found a few lengths that could generate two relevant tones depending on whether they were open, partially blocked, or capped. This tells me that I could use a moving valve to change the tone, and I would not have to carry as many instruments.
The most significant discovery was when I drilled into the cap. I did not expect any change with a 1/8" (3mm) hole, but I heard a clear tone and a higher frequency than before, and I needed some pitches over 1.2KHz. It was late in the day, so I could not experiment more with that technique.
Field notes
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2023-10-09
I started with the larger size and repeated yesterday's testing method with an open tube, partially blocked, capped, then trimming an inch. I jotted down the results until I got to 8" from labium to tip, where the primary frequency and the next most audible resonance fell close to the DTMF tones to transmit a 2. The decoder on my phone confirmed that when I blew on the open pipe, it detected the numeral. I stopped cutting that pipe and set it aside.
When I started the project, I wanted a double-necked flute that could emit any of the sixteen DTMF signals by careful finger placement, but that felt only possible with a lot more work. I would settle for twelve pipes that corresponded with a single character.
I continued my experimentation with the 1/2" pipe and found a few lengths that could generate two relevant tones depending on whether they were open, partially blocked, or capped. This tells me that I could use a moving valve to change the tone, and I would not have to carry as many instruments.
The most significant discovery was when I drilled into the cap. I did not expect any change with a 1/8" (3mm) hole, but I heard a clear tone and a higher frequency than before, and I needed some pitches over 1.2KHz. It was late in the day, so I could not experiment more with that technique.
The rest of the posts for this project have been arranged by date.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2023-10-09
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