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  • #16
    Originally posted by J M Fahey View Post
    I find it curious that our new Member posted her question 2 days ago and has never even checked in since ... we posted 10 answers but maybe we are just talking with the rocks
    Perhaps it was just publicity for her course?

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    • #17
      Originally posted by Dave H View Post
      Perhaps it was just publicity for her course?
      According to the linked schedules, classes are already in session.
      DON'T FEED THE TROLLS!

      Comment


      • #18
        Originally posted by Dave H View Post
        Perhaps it was just publicity for her course?
        I almost put it in the spam folder before anyone responded because I thought it looked fishy (as in fishing for blog traffic). It's possible she hired someone to post links in likely places and doesn't even know it's here herself.

        P.S. Her blog has advertising below the fold; probably a pay-per-click thing.
        -tb

        "If you're the only person I irritate with my choice of words today I'll be surprised" Chuck H.

        Comment


        • #19
          Originally posted by Leo_Gnardo View Post
          Sometimes new members are slow in keeping up. And the good professor may be keeping busy with her teaching schedule & students' projects. Or she may be put off by - what seem to be - wise guy answers. Although there are valuable things to be found in some of them. In any case, those who wish to post, go ahead. And the rest of us will await some feedback. Meanwhile, on with business as usual.
          That would require *reading* them first, wouldnīt it?
          Juan Manuel Fahey

          Comment


          • #20
            Originally posted by tboy View Post
            P.S. Her blog has advertising below the fold; probably a pay-per-click thing.
            Yea, so? When I browse using a system with no ad blocker installed, I see ads at the top of this very forum.
            Right now, Feelin'GoodTees.com. More often, some "Date Mature Women" site.
            -rb
            DON'T FEED THE TROLLS!

            Comment


            • #21
              Originally posted by rjb View Post
              When I browse using a system with no ad blocker installed, I see ads at the top of this very forum.
              Sure, we have ads here, but I don't go around to other sites trolling for extra traffic to come see them.
              -tb

              "If you're the only person I irritate with my choice of words today I'll be surprised" Chuck H.

              Comment


              • #22
                Originally posted by rjb View Post
                I see ads at the top of this very forum.
                Right now, Feelin'GoodTees.com. More often, some "Date Mature Women" site.
                -rb
                I get "Mature Dating" too. Don't the ads you see depend on your browsing habits?

                Comment


                • #23
                  Originally posted by Dave H View Post
                  Don't the ads you see depend on your browsing habits?
                  Could be. I spend way too much time hanging out at "the old mans' club".
                  DON'T FEED THE TROLLS!

                  Comment


                  • #24
                    Coils can be made shallow and wide using thin flat neodymiums, and not really be any bigger or heavier than a coat-button. The challenge is attaching the edge of a voice coil to a surface that is stiff enough to provide the sort of piston motion required to move air. In principle, any sort of fabric would not be stiff enough. But I suppose a segment of a larger continuous piece of material could be starched in localized fashion, and provide that stiffer surface.

                    Comment


                    • #25
                      I just stumbled across this post by Mick Bailey, which discusses some polymer electro-mechanical action. Could the relationship be reversible, that applying a voltage across a blob of "some kind of polymer" change its shape? Allowing soft, pulsating membranes? They'd probably sound like frying eggs, though. Unless the eggs were being cooked on the PYRO-BOARD!

                      Of course, this line of thought begs the question, was the original post about "what can I sew into my garments", or was it "what can I spend the next 10 years studying in a lab". For a college course perhaps both are valid, at least for discussion.
                      If it still won't get loud enough, it's probably broken. - Steve Conner
                      If the thing works, stop fixing it. - Enzo
                      We need more chaos in music, in art... I'm here to make it. - Justin Thomas
                      MANY things in human experience can be easily differentiated, yet *impossible* to express as a measurement. - Juan Fahey

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                      • #26
                        Oh, there is such a thing as "piezo film" and it is reversible.
                        Juan Manuel Fahey

                        Comment


                        • #27
                          Originally posted by J M Fahey View Post
                          Oh, there is such a thing as "piezo film" and it is reversible.
                          Last time I checked (which was a few years ago), it could only be purchased in massive quantities.
                          Some luthier had a blog showing how to build piezo film pickups for archtop guitar, and gave contact info for the film manufacturer. But the manufacturer subsequently stopped selling small quantities. You could find "vibra tab" piezo sensors, but not small sheets of film. Of course, somebody must have some somewhere....
                          DON'T FEED THE TROLLS!

                          Comment


                          • #28
                            Yes, afaik saddle transducers are being made out of piezo film instead of a piezo ceramic "toothpick" which can easily be cracked; plastic piezo film accomodates better typical uneven saddle cavities.

                            There used to be also a piezo film tweeter ... what already indicates the possible quality of sound available.

                            I bet if you make a T Shirt out of it and play some music, voices will sound like chipmunks and drum kits will seem to be made out of cymbals only.

                            Itīs in full production and datasheet suggests multiple cool uses
                            http://www.mouser.com/ds/2/261/Piezo...ide-277411.pdf

                            Accelerometer
                            ACH-01 (General Purpose)
                            -Motion (Theft) Sensors
                            -Shipping Damage
                            -Machinery Monitoring
                            -Motional Feedback for Speakers
                            -Appliance Monitoring
                            ACH04-08 (Multi-Axis)
                            -Disc Drive Shock Sensing
                            -Impact Switching
                            -Seismic
                            -Biomedical Monitoring
                            Vibration/Motion Film Sensor
                            DT Series (Unlaminated, Unshielded)
                            -Dynamic Strain Gages
                            -Acoustic Pickups
                            -Musical Instrument Triggers

                            -Tamper Detection
                            LDT Series (Laminated, Unshielded) & LDTC
                            -Antitheft Alarm
                            -Vending
                            • Dispensing Verification
                            • Coin Drop Counters
                            • Antitamper
                            • Penetration Panels
                            -Fan Failure
                            -Application Monitoring
                            -Washer Imbalance
                            -Microwave - Sound Pickup
                            -Dishwasher Spray Arm
                            -Water Flow Sensor
                            -Vacuum Soil Sensing
                            SDT Series (Unlaminated, Shielded)
                            -Musical Instrument Triggers
                            -Contact Microphones

                            Custom Sensors
                            -Textile Sensors
                            -Medical Monitoring
                            • Patient Bed Monitor
                            • Pulse Counter
                            • Fetal Heart Monitor
                            • Apnea Monitoring
                            • Anesthesia Monitor (Sleep
                            Disorder)
                            • Respitory Air Flow
                            • Sleep Disorder (REM)
                            • Pacemaker Activity Monitor
                            -Penetration/Antitamper Panels
                            • PCMCIA Cards
                            • Data Storage Devises
                            MEASUREMENT SPECIALTIES, INC. www.meas-spec.com (757) 766-1500 Fax (757) 766-4297 1
                            Typiicall Applliicattiions fforr Piiezo Fiillm Sensorrs
                            Effective: August 1st, 2008
                            Audio/Acoustic
                            -Microphones

                            •Dive Helmets
                            •Gas Mask
                            •Contact
                            -Stethoscope
                            -Acoustic Pickups
                            -Flow Sensors
                            -Speakers
                            •Novelty Consumer
                            •Tweeters
                            •Pagers
                            Ultrasound (40 kHz & 80 KHz)
                            -Air-Ranging Proximity
                            -Medical Imaging Catheters
                            -Phased Array
                            -Acoustic Emission
                            -Level Sensors (Inkjet, toner)
                            -Robotic Tactile Sensors
                            -Variable Force Sensors
                            -Digitizers
                            Switch
                            SW100 Series
                            -Pinball Impact Switches <---
                            - Gaming Machine Switches
                            <---- these ones for ENZO
                            - Utility Meter Counters
                            Custom Switches
                            -Vector Switch/Joystick
                            - CMOS Circuit Wake-Up Switch
                            -Pacinko Game
                            -Electronic Piano Keys
                            -Impact Printer Timing Switch
                            -Sports Target (Impact)
                            -Snap Action Switches
                            -Beam Switch
                            Piezo Cable
                            -Step Switches
                            -Pedestrian Safety Mats (Fence & Buried)
                            -Perimeter Security
                            -Antitamper
                            Traffic Sensors
                            Series BL
                            -Vehicle Classification
                            -Weight-in-Motion
                            -Speed/Red Light Enforcement
                            -Airport Taxiway
                            -Security/Safety
                            They donīt sell small quantities or send free samples but offer "development kits":
                            Contents of the Basic Design Kit:
                            This kit demonstrates the
                            use of MEAS piezo film sensors
                            as microphones, speakers,
                            switches and acoustic
                            pickups. All the components
                            and film samples in the kit
                            can be used for experimentation.
                            This kit demonstrates the
                            capabilities of piezo film as
                            a vibration sensor and
                            accelerometer component.
                            The kit includes shielded and
                            unshielded thin film sensors
                            and an ACH-01 accelerometer
                            component with an
                            interface amplifier.
                            EDIT:

                            Juan Manuel Fahey

                            Comment


                            • #29
                              Lots of interesting info in this thread but I'm thinking that the OP's real intention was the posting of click bait.
                              Keep learning. Never give up.

                              Comment


                              • #30
                                Originally posted by Reader View Post
                                Lots of interesting info in this thread but I'm thinking that the OP's real intention was the posting of click bait.
                                Me too. tboy's instinct was right, it would seem.

                                I guess we got suckered again....
                                Experience is something you get, just after you really needed it.

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