<div dir="ltr">Hank,<div><br></div><div>My brother in law used to work for a company that designed this kind of stuff so I sent your post to him and this is his response. Hope it helps.</div><div><br></div><div>Rick<br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Wally Schneider</b> <span dir="ltr"><<a href="mailto:wally@designenginuity.com">wally@designenginuity.com</a>></span><br>Date: Mon, May 14, 2018 at 4:02 AM<br>Subject: RE: [PSUBS-MAILIST] transducer<br>To: Rick Patton <<a href="mailto:satwelder@gmail.com">satwelder@gmail.com</a>><br><br><br><div lang="EN-US" link="blue" vlink="purple"><div class="m_-7348816731435350215WordSection1"><p class="MsoNormal"><span>Hi Rick,<u></u><u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><p class="MsoNormal"><span>If it’s a straight-up piezo transducer (no matching network) and Hank has access to some basic lab gear, the resonant frequency can be measured using the method in the link below.<u></u><u></u></span></p><p class="MsoNormal"><span><a href="https://www.americanpiezo.com/knowledge-center/piezo-theory/determining-resonance-frequency.html" target="_blank">https://www.americanpiezo.com/<wbr>knowledge-center/piezo-theory/<wbr>determining-resonance-<wbr>frequency.html</a>. <span> </span><span> </span>Probably the best results would be with the transducer in air.<u></u><u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><p class="MsoNormal"><span>If he doesn’t have the gear/expertise, his local college physics dept may be able to help him.<u></u><u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#7f7f7f">Wally Schneider<u></u><u></u></span></b></p><p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#7f7f7f">Design Enginuity<u></u><u></u></span></b></p><p class="MsoNormal"><u><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0070c0"><a href="mailto:wally@designenginuity.com" target="_blank">wally@designenginuity.com</a></span></u><u><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#7f7f7f">     <wbr>             </span></u><u><span style="font-size:8.0pt;font-family:Wingdings;color:gray">(</span></u><u><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#7f7f7f">  425.239.0265<u></u><u></u></span></u></p><p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#7f7f7f">Electronic Design |  Schematic Capture |  Project Management  |  PCB Layout<u></u><u></u></span></p><p class="MsoNormal"><span><u></u> <u></u></span></p><p class="MsoNormal" style="margin-left:.5in"><b><span>From:</span></b><span> Rick Patton <<a href="mailto:satwelder@gmail.com" target="_blank">satwelder@gmail.com</a>> <br><b>Sent:</b> Sunday, May 13, 2018 10:59 AM<br><b>To:</b> Wally Schneider <<a href="mailto:wally@designenginuity.com" target="_blank">wally@designenginuity.com</a>><br><b>Subject:</b> Fwd: [PSUBS-MAILIST] transducer<u></u><u></u></span></p><p class="MsoNormal" style="margin-left:.5in"><u></u> <u></u></p><div><p class="MsoNormal" style="margin-left:.5in">Hey Sir Walter,<u></u><u></u></p><div><p class="MsoNormal" style="margin-left:.5in"><u></u> <u></u></p></div><div><p class="MsoNormal" style="margin-left:.5in">Just got your drawings and printed them so I can take them over to the shop and try and follow threw with your suggestions. I am forwarding this email on to you from Hank as I am sure you would know the answer as you worked with that company in the north end of lake Washington for a while and that's what they did?? <u></u><u></u></p></div><div><p class="MsoNormal" style="margin-left:.5in">Rick <u></u><u></u></p></div><div><p class="MsoNormal" style="margin-left:.5in"><u></u> <u></u></p><div><p class="MsoNormal" style="margin-right:0in;margin-bottom:12.0pt;margin-left:.5in">---------- Forwarded message ----------<br>From: <b>hank pronk via Personal_Submersibles</b> <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>><br>Date: Sun, May 13, 2018 at 3:46 AM<br>Subject: [PSUBS-MAILIST] transducer<br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>><br><u></u><br><u></u><u></u><u></u></p><div><div><div><p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">HI All,<u></u><u></u></span></p></div><div><p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif">I am looking for a 10Hz transducer for my coms.  Does anyone know how to test a transducer to determine if it is 10Hz or 27Hz.<u></u><u></u></span></p></div><div><p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#888888">Hank<u></u><u></u></span></p></div></div></div><p class="MsoNormal" style="margin-right:0in;margin-bottom:12.0pt;margin-left:.5in"><br>______________________________<wbr>_________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.<wbr>org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><u></u><u></u></p></div><p class="MsoNormal" style="margin-left:.5in"><u></u> <u></u></p></div></div></div></div></div><br></div></div>