<?xml version="1.0"?>
<oembed><version>1.0</version><provider_name>Johnson's Techworld</provider_name><provider_url>https://johnsonfrancis.org/techworld</provider_url><author_name>Johnson Francis</author_name><author_url>https://johnsonfrancis.org/techworld/author/jf/</author_url><title>More on Electret Microphones - Johnson's Techworld</title><type>rich</type><width>600</width><height>338</height><html>&lt;blockquote class="wp-embedded-content" data-secret="NBxYVXQzoW"&gt;&lt;a href="https://johnsonfrancis.org/techworld/more-on-electret-microphones/"&gt;More on Electret Microphones&lt;/a&gt;&lt;/blockquote&gt;&lt;iframe sandbox="allow-scripts" security="restricted" src="https://johnsonfrancis.org/techworld/more-on-electret-microphones/embed/#?secret=NBxYVXQzoW" width="600" height="338" title="&#x201C;More on Electret Microphones&#x201D; &#x2014; Johnson's Techworld" data-secret="NBxYVXQzoW" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"&gt;&lt;/iframe&gt;&lt;script&gt;
/*! This file is auto-generated */
!function(d,l){"use strict";l.querySelector&amp;&amp;d.addEventListener&amp;&amp;"undefined"!=typeof URL&amp;&amp;(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&amp;&amp;!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i&lt;o.length;i++)o[i].style.display="none";for(i=0;i&lt;a.length;i++)s=a[i],e.source===s.contentWindow&amp;&amp;(s.removeAttribute("style"),"height"===t.message?(1e3&lt;(r=parseInt(t.value,10))?r=1e3:~~r&lt;200&amp;&amp;(r=200),s.height=r):"link"===t.message&amp;&amp;(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&amp;&amp;n.host===r.host&amp;&amp;l.activeElement===s&amp;&amp;(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r&lt;s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document);
//# sourceURL=https://johnsonfrancis.org/techworld/wp-includes/js/wp-embed.min.js
&lt;/script&gt;
</html><thumbnail_url>https://johnsonfrancis.org/techworld/wp-content/uploads/2024/12/More-on-Electret-Microphones.jpg</thumbnail_url><thumbnail_width>1201</thumbnail_width><thumbnail_height>675</thumbnail_height><description>Important specifications of an electret microphone are its directivity, sensitivity and signal to noise ratio. Directivity is the directionality or polar pattern and indicates how sensitive it is to sounds coming from different directions and angles. Omnidirectional microphones can pick up sound from any direction like an omnidirectional antenna. They are useful for picking up [&hellip;]</description></oembed>
