{"id":214,"date":"2009-04-09T08:19:00","date_gmt":"2009-04-09T06:19:00","guid":{"rendered":"http:\/\/dh5ym.hopto.org\/wiki\/?page_id=214"},"modified":"2013-02-08T18:37:13","modified_gmt":"2013-02-08T18:37:13","slug":"minidds-signal-generator","status":"publish","type":"page","link":"https:\/\/dh5ym.hopto.org\/wiki\/?page_id=214","title":{"rendered":"MiniDDS signal generator"},"content":{"rendered":"<p>Having the need for a configurable reference frequency source i decided to use some of the AD9832 flying around here to build up a small<br \/>\nDDS signal generator. The work done by SM2LKM, Johan was a excellent point to start.<br \/>\nFind his documentation here: <a href=\"http:\/\/home.swipnet.se\/~w-41522\/minidds\/minidds.html\">http:\/\/home.swipnet.se\/~w-41522\/minidds\/minidds.html<\/a><\/p>\n<p>I decided to create my own board to fulfill some requirements<br \/>\nregarding connectors and formfactor of the board. From the schematic point it is almost the same than that from Johan except the low pass filter i used and<br \/>\nthe additional divider for the reference oscillator.<\/p>\n<div id=\"attachment_216\" style=\"width: 473px\" class=\"wp-caption aligncenter\"><a rel=\"attachment wp-att-216\" href=\"..\/wiki\/?attachment_id=216\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-216\" class=\"size-medium wp-image-216\" title=\"minidds_top\" src=\"..\/wiki\/wp-content\/uploads\/2009\/04\/minidds_top-300x225.jpg\" alt=\"MiniDDS signal generator top view\" width=\"463\" height=\"347\" srcset=\"https:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2009\/04\/minidds_top-300x225.jpg 300w, https:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2009\/04\/minidds_top-1024x768.jpg 1024w, https:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2009\/04\/minidds_top-624x468.jpg 624w, https:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2009\/04\/minidds_top.jpg 2048w\" sizes=\"auto, (max-width: 463px) 100vw, 463px\" \/><\/a><p id=\"caption-attachment-216\" class=\"wp-caption-text\">MiniDDS signal generator top view<\/p><\/div>\n<p>The board does not contain any microcontroller. So you can decide whether you want to connect it to a PC or to a microcontroller. I created a small piece of C-code software for Atmel AVR microcontrollers (Atmega644, but you can adapt it to different one) to control and test the signal generator. At the moment it is just possible to enter the desired output frequency and the divider is set automatically. It does not make any use of the second frequency register and the phase registers. In addition i did some experiments in creating a WSPR signal with this setup.<\/p>\n<p>Some more information you can find in this document (2.5MByte) :<br \/>\n<a href=\"..\/download\/MiniDDS_1v0.pdf\">MiniDDS_1v0.pdf<\/a><\/p>\n<p>The complete sources including layout, documentation sources and software sources can be found here (12MByte) :<br \/>\n<a href=\"..\/download\/MiniDDS_1v0.zip\">MiniDDS_1v0.zip<\/a><\/p>\n<p>Would be nice to hear from you if you are interested in this work.<\/p>\n<p>73\u00b4s de Mario<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Having the need for a configurable reference frequency source i decided to use some of the AD9832 flying around here to build up a small DDS signal generator. The work done by SM2LKM, Johan was a excellent point to start. &hellip; <a href=\"https:\/\/dh5ym.hopto.org\/wiki\/?page_id=214\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":44,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-214","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/pages\/214","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=214"}],"version-history":[{"count":2,"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/pages\/214\/revisions"}],"predecessor-version":[{"id":860,"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/pages\/214\/revisions\/860"}],"up":[{"embeddable":true,"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/pages\/44"}],"wp:attachment":[{"href":"https:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}