{"id":12263,"date":"2014-05-26T12:14:44","date_gmt":"2014-05-26T16:14:44","guid":{"rendered":"http:\/\/zerokidz.com\/ideas\/?p=12263"},"modified":"2014-09-17T00:42:16","modified_gmt":"2014-09-17T04:42:16","slug":"am-audio-transmitter-using-arduino","status":"publish","type":"post","link":"https:\/\/reactivemusic.net\/?p=12263","title":{"rendered":"AM audio transmitter using Arduino"},"content":{"rendered":"<p class=\"lead\">Transmit AM audio on 727 KHz. using a voltage divider and an Arduino.<\/p>\n<p><cite>By Markus Gritsch<\/cite><\/p>\n<p>Note: with the actual circuit the signal is closer to 760 KHz.<\/p>\n<p>Samples incoming audio at 34 KHz. and rebroadcasts as RF using the Arduino clock.<\/p>\n<p>This is a simplification of Markus&#8217; original circuit. It eliminates the tuned output circuit. Probably at the expense of increased harmonic distortion.<\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/05\/voltage-divider.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-12264\" title=\"voltage-divider\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/05\/voltage-divider-300x224.jpg\" alt=\"\" width=\"300\" height=\"224\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/05\/voltage-divider-300x224.jpg 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/05\/voltage-divider.jpg 640w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The voltage divider is uses 2 47K Ohm resistors and a 1 uF electrolytic capacitor. It is the input half of the original circuit.<\/p>\n<p><a href=\"http:\/\/dangerousprototypes.com\/forum\/viewtopic.php?f=56&amp;t=2892#p28410\">http:\/\/dangerousprototypes.com\/forum\/viewtopic.php?f=56&amp;t=2892#p28410<\/a><\/p>\n<p><a href=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/05\/Screen-Shot-2014-05-26-at-12.03.39-PM.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-12265\" title=\"Screen Shot 2014-05-26 at 12.03.39 PM\" src=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/05\/Screen-Shot-2014-05-26-at-12.03.39-PM-300x174.png\" alt=\"\" width=\"300\" height=\"174\" srcset=\"https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/05\/Screen-Shot-2014-05-26-at-12.03.39-PM-300x174.png 300w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/05\/Screen-Shot-2014-05-26-at-12.03.39-PM-1024x596.png 1024w, https:\/\/reactivemusic.net\/wp-content\/uploads\/2014\/05\/Screen-Shot-2014-05-26-at-12.03.39-PM.png 1122w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>(I substituted 2 100 K Ohm resistors in parallel for each of the 47 K&#8217;s.)<\/p>\n<p>A voltage divider is useful as a general purpose coupler, for sampling analog signals using \u00a0Arduino PWM input.<\/p>\n<p>The Arduino sketch is Markus&#8217; original &#8211; reprinted here:<\/p>\n<p>(note) Local file is AM_audio_transmitter.<\/p>\n<pre class=\"brush: java; gutter: true\">\/\/ Simple AM Radio Signal Generator :: Markus Gritsch\r\n\/\/ http:\/\/www.youtube.com\/watch?v=y1EKyQrFJ\u2212o\r\n\/\/\r\n\/\/ \/|\\ +5V ANT\r\n\/\/ | \\ | \/\r\n\/\/ | \u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212 \\|\/\r\n\/\/ | | R1 | Arduino 16 MHz | C2 |\r\n\/\/ | | 47k | | || | about\r\n\/\/ audio C1 | | | TIMER_PIN &gt;\u2212\u2212\u2212\u2212\u2212||\u2212\u2212\u2212\u2212\u2212+ 40Vpp\r\n \/\/ input || | | | || |\r\n \/\/ o\u2212\u2212\u2212\u2212\u2212||\u2212\u2212\u2212\u2212\u2212+\u2212\u2212\u2212\u2212\u2212\u2212\u2212&gt; INPUT_PIN | 1nF |\r\n \/\/ +|| | | | )\r\n \/\/ 1uF | | R2 | ATmega328P | ) L1\r\n \/\/ | | 47k \u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212\u2212 fres = ) 47uH\r\n \/\/ fg &lt; 7 Hz | | 734 kHz )\r\n \/\/ | |\r\n \/\/ | |\r\n \/\/ \u2212\u2212\u2212 GND \u2212\u2212\u2212 GND\r\n \/\/\r\n \/\/ fg = 1 \/ ( 2 * pi * ( R1 || R2 ) * C1 ) &lt; 7 Hz\r\n \/\/ fres = 1 \/ ( 2 * pi * sqrt( L1 * C2 ) ) = 734 kHz\r\n\r\n#define INPUT_PIN 0 \/\/ ADC input pin\r\n#define TIMER_PIN 3 \/\/ PWM output pin, OC2B (PD3)\r\n#define DEBUG_PIN 2 \/\/ to measure the sampling frequency\r\n#define LED_PIN 13 \/\/ displays input overdrive\r\n\r\n#define SHIFT_BY 3 \/\/ 2 ... 7 input attenuator\r\n#define TIMER_TOP 20 \/\/ determines the carrier frequency\r\n#define A_MAX TIMER_TOP \/ 4\r\n\r\nvoid setup() {\r\npinMode( DEBUG_PIN, OUTPUT );\r\npinMode( TIMER_PIN, OUTPUT );\r\npinMode( LED_PIN, OUTPUT );\r\n\r\n\/\/ set ADC prescaler to 16 to decrease conversion time (0b100)\r\nADCSRA = ( ADCSRA | _BV( ADPS2 ) ) &amp; ~( _BV( ADPS1 ) | _BV( ADPS0 ) );\r\n\r\n\/\/ non\u2212inverting; fast PWM with TOP; no prescaling\r\nTCCR2A = 0b10100011; \/\/ COM2A1 COM2A0 COM2B1 COM2B0 \u2212 \u2212 WGM21 WGM20\r\nTCCR2B = 0b00001001; \/\/ FOC2A FOC2B \u2212 \u2212 WGM22 CS22 CS21 CS20\r\n\r\n\/\/ 16E6 \/ ( OCR2A + 1 ) = 762 kHz @ TIMER_TOP = 20\r\nOCR2A = TIMER_TOP; \/\/ = 727 kHz @ TIMER_TOP = 21\r\nOCR2B = TIMER_TOP \/ 2; \/\/ maximum carrier amplitude at 50% duty cycle\r\n}\r\n\r\nvoid loop() {\r\n\/\/ about 34 kHz sampling frequency\r\ndigitalWrite( DEBUG_PIN, HIGH );\r\nint8_t value = (analogRead( INPUT_PIN ) &gt;&gt; SHIFT_BY ) - (1 &lt;&lt; (9 - SHIFT_BY ));\r\n\r\ndigitalWrite( DEBUG_PIN, LOW );\r\n\r\n\/\/ clipping\r\n\r\nif( value &lt; -A_MAX) {\r\n\r\n  value = -A_MAX;\r\n  digitalWrite( LED_PIN, HIGH );\r\n  } else if ( value &gt; A_MAX ) {\r\n  value = A_MAX;\r\n  digitalWrite( LED_PIN, HIGH );\r\n  } else {\r\n  digitalWrite( LED_PIN, LOW );\r\n  }\r\n\r\nOCR2B = A_MAX + value;\r\n\r\n}<\/pre>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Transmit AM audio on 727 KHz. using a voltage divider and an Arduino. By Markus Gritsch Note: with the actual circuit the signal is closer to 760 KHz. Samples incoming audio at 34 KHz. and rebroadcasts as RF using the Arduino clock. This is a simplification of Markus&#8217; original circuit. It eliminates the tuned output &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/reactivemusic.net\/?p=12263\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;AM audio transmitter using Arduino&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[230,21],"tags":[20,55,190,57],"class_list":["post-12263","post","type-post","status-publish","format-standard","hentry","category-development","category-dsp","tag-arduino","tag-electronics","tag-portfolio","tag-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AM audio transmitter using Arduino - reactive music<\/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:\/\/reactivemusic.net\/?p=12263\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AM audio transmitter using Arduino - reactive music\" \/>\n<meta property=\"og:description\" content=\"Transmit AM audio on 727 KHz. using a voltage divider and an Arduino. By Markus Gritsch Note: with the actual circuit the signal is closer to 760 KHz. Samples incoming audio at 34 KHz. and rebroadcasts as RF using the Arduino clock. This is a simplification of Markus&#8217; original circuit. 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By Markus Gritsch Note: with the actual circuit the signal is closer to 760 KHz. Samples incoming audio at 34 KHz. and rebroadcasts as RF using the Arduino clock. This is a simplification of Markus&#8217; original circuit. 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