I used PVC pipes to experiment with round instruments. I carved a labium using a razor knife and a bit of patience. I made a laser-cut block for the pipes' mouth end, but I only got sound when I pushed the block to the window's edge. I designed a pinecone valve to experiment with different airflows, which worked best at 10-15%. I made several versions with different lengths and hole sizes, but none worked perfectly.
Cylindrical instruments
I did some experiments to determine the factors that generate tones. I cut up my 12" slide whistle and measured the frequency at different lengths. I repeated the process until the tube was 4" long. I also performed a similar test with a partially stoppered flute.
Experimental debris
I experimented with using a 3/4" thin-walled tubing instead of 1/2" schedule-40 pipe, which was less expensive and had more internal volume. I tested the wider tubes to determine if they would provide a lower frequency than a smaller diameter. After cutting the pipe into a 20" (500mm) piece and carving a labium, I found a length that produced a primary frequency and the next most audible resonance close to the DTMF tones to transmit a 2.
Working DTMF Phlute
I made a pipe for each tone, focusing on one frequency at a time. I used 1/2" PVC for higher-pitched column frequencies and 3/4" PVC for lower row frequencies. I had to swap my single wooden block to test the 3/4" PVC, and the final unit was much larger than I anticipated. I want to revise and make something portable.
Working but impractical
I shrunk the design to what I initially imagined. The technique was to cut a plain 3/4" pipe that matched the lowest frequency used by the rows and a 1/2" tube for the column tones. I added and widened holes until I found configurations that produced the desired pitches. I painted it red as an homage to the phreaking Red Box.
I made a second Phlute and wrote an Instructable using crucial details like hole diameter and position. I included screenshots from apps and glossed over failures. I plan to test a circuit with a DTMF decoder and sound amplifier so I can show off at conventions.
Instructable for Phlute
The rest of the summary posts 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.
I did some experiments to determine the factors that generate tones. I cut up my 12" slide whistle and measured the frequency at different lengths. I repeated the process until the tube was 4" long. I also performed a similar test with a partially stoppered flute.
I experimented with using a 3/4" thin-walled tubing instead of 1/2" schedule-40 pipe, which was less expensive and had more internal volume. I tested the wider tubes to determine if they would provide a lower frequency than a smaller diameter. After cutting the pipe into a 20" (500mm) piece and carving a labium, I found a length that produced a primary frequency and the next most audible resonance close to the DTMF tones to transmit a 2.
I made a pipe for each tone, focusing on one frequency at a time. I used 1/2" PVC for higher-pitched column frequencies and 3/4" PVC for lower row frequencies. I had to swap my single wooden block to test the 3/4" PVC, and the final unit was much larger than I anticipated. I want to revise and make something portable.
I shrunk the design to what I initially imagined. The technique was to cut a plain 3/4" pipe that matched the lowest frequency used by the rows and a 1/2" tube for the column tones. I added and widened holes until I found configurations that produced the desired pitches. I painted it red as an homage to the phreaking Red Box.
(0:06) Phlute REV 2
I made a second Phlute and wrote an Instructable using crucial details like hole diameter and position. I included screenshots from apps and glossed over failures. I plan to test a circuit with a DTMF decoder and sound amplifier so I can show off at conventions.
The rest of the summary posts 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.
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