{"id":17018,"date":"2026-05-05T07:45:04","date_gmt":"2026-05-05T02:15:04","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=17018"},"modified":"2026-05-05T07:45:05","modified_gmt":"2026-05-05T02:15:05","slug":"pt2399-mic-preamplifier-and-echo-board","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/pt2399-mic-preamplifier-and-echo-board\/","title":{"rendered":"PT2399 Mic Preamplifier and Echo Board"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/AJIXCg-J_wA?si=RE1Ht2rp9eKrMSsV\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">The <strong>PT2399<\/strong> is a widely used CMOS digital echo processor IC, prized in the DIY electronics community for its ability to mimic analog &#8220;bucket brigade&#8221; delays with modern digital sampling. It converts incoming audio into a digital bitstream, stores it in 44 kb of internal RAM, and then reconverts it to analog after a specified delay to create echo or reverb effects. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key Specifications &amp; Features of Echo PT2399 IC<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Operating Voltage:<\/strong> Typically <strong>5V DC<\/strong> (though many boards include a 7805 regulator for 9-12V input).<\/li>\n\n\n\n<li><strong>Delay Time:<\/strong> Adjustable from <strong>30ms to 340ms<\/strong> via an external resistor or potentiometer on Pin 6.<\/li>\n\n\n\n<li><strong>Audio Quality:<\/strong> Low Total Harmonic Distortion (THD &lt; 0.5%) and high signal-to-noise ratio (-90dBV typical).<\/li>\n\n\n\n<li><strong>Applications:<\/strong> Ideal for adding &#8220;presence&#8221; to microphone signals and building guitar delay pedals.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The one I bought from a local electronics shop is a straightforward, single-channel board that operates on <strong>12V DC<\/strong>. It comes pre-assembled with a microphone and potentiometer ports, making it easy to wire. I have wired input and output audio jacks as well as a couple of potentiometers, one for mic gain control and another for echo or reverberation. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There are three controls on the standard interface for most <strong>PT2399<\/strong> echo and reverb modules. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. MIC VOL (Microphone Volume)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This is the <strong>Gain<\/strong> or <strong>Input Level<\/strong> control.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Function:<\/strong> It adjusts the loudness of the microphone signal before it enters the echo circuit.<\/li>\n\n\n\n<li><strong>Purpose:<\/strong> If your voice sounds distorted or &#8220;clipped,&#8221; you need to turn this down. If the output is too quiet compared to your background music, you turn this up.<\/li>\n\n\n\n<li><strong>Technical Note:<\/strong> In most DIY boards, this affects the &#8220;Dry&#8221; signal (your original voice) as well as the signal being sent into the digital processor.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. REVERB (Echo Delay Time)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">On PT2399 boards, this label is a bit of a misnomer; it actually controls the <strong>Delay Time<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Function:<\/strong> It changes the &#8220;speed&#8221; of the echo.<\/li>\n\n\n\n<li><strong>Purpose:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Low Setting:<\/strong> Creates a very fast &#8220;slapback&#8221; echo, which sounds more like a natural room reverb or &#8220;presence.&#8221;<\/li>\n\n\n\n<li><strong>High Setting:<\/strong> Creates a distinct, long-separated echo (e.g., &#8220;Hello&#8230; Hello&#8230; Hello&#8221;).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Technical Note:<\/strong> This pot is connected to <strong>Pin 6<\/strong> of the PT2399 IC. It varies the internal clock frequency. If you turn it too high (long delay), you may notice a slight digital hiss or &#8220;sampling noise,&#8221; which is a known characteristic of the PT2399 at its limits.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. REP (Repeat \/ Feedback)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">This stands for <strong>Repeat<\/strong> or <strong>Intensity<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Function:<\/strong> It controls how much of the &#8220;Echo&#8221; signal is fed back into the input of the processor.<\/li>\n\n\n\n<li><strong>Purpose:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Low Setting:<\/strong> You get a single echo that disappears immediately.<\/li>\n\n\n\n<li><strong>High Setting:<\/strong> The echo repeats multiple times, fading out slowly.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Technical Note:<\/strong> Be careful with this setting. If you turn <strong>REP<\/strong> too high, the circuit enters &#8220;self-oscillation.&#8221; This creates a runaway loop where the echoes get louder and louder until they become a wall of distorted noise.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Summary Table for Quick Tuning<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td><strong>Port<\/strong><\/td><td><strong>Controls&#8230;<\/strong><\/td><td><strong>Result of Turning Clockwise (Max)<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>MIC VOL<\/strong><\/td><td>Input Strength<\/td><td>Louder voice, potential for distortion.<\/td><\/tr><tr><td><strong>REVERB<\/strong><\/td><td>Delay Gap<\/td><td>Slower, longer intervals between echoes.<\/td><\/tr><tr><td><strong>REP<\/strong><\/td><td>Echo Count<\/td><td>More repeats; eventually leads to infinite feedback.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The PT2399 is a widely used CMOS digital echo processor IC, prized in the DIY electronics community for its ability to mimic analog &#8220;bucket brigade&#8221; delays with modern digital sampling. It converts incoming audio into a digital bitstream, stores it in 44 kb of internal RAM, and then reconverts it to analog after a specified [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":17019,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-17018","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PT2399 Mic Preamplifier and Echo Board - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/pt2399-mic-preamplifier-and-echo-board\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PT2399 Mic Preamplifier and Echo Board - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"The PT2399 is a widely used CMOS digital echo processor IC, prized in the DIY electronics community for its ability to mimic analog &#8220;bucket brigade&#8221; delays with modern digital sampling. 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