{"id":180,"date":"2020-02-20T22:26:04","date_gmt":"2020-02-20T22:26:04","guid":{"rendered":"https:\/\/blog.andytather.co.uk\/?page_id=180"},"modified":"2020-06-09T19:33:53","modified_gmt":"2020-06-09T19:33:53","slug":"guardian-686","status":"publish","type":"page","link":"https:\/\/blog.andytather.co.uk\/index.php\/lm3886-build-thread\/guardian-686\/","title":{"rendered":"Guardian 686 Build"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200216_145611-1024x768.jpg\" alt=\"\" class=\"wp-image-183\" srcset=\"https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200216_145611-1024x768.jpg 1024w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200216_145611-300x225.jpg 300w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200216_145611-768x576.jpg 768w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200216_145611-1536x1152.jpg 1536w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200216_145611-2048x1536.jpg 2048w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200216_145611-1200x900.jpg 1200w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200216_145611-1980x1485.jpg 1980w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>If you are a novice builder like myself then at this point it might be a good idea to test the signal path to save re-soldering when the other components are installed. Test continuity with a multi-meter between:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">J2 (Pin 1) -&gt; Q1 (Center Pin\/Tab)\nQ2 (Center Pin\/Tab) -&gt; Out1<\/pre>\n\n\n\n<pre class=\"wp-block-preformatted\">J2 (Pin 2) -&gt; Q6 (Center Pin\/Tab)\nQ7 (Center Pin\/Tab) -&gt; Out2<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200222_133450-1024x768.jpg\" alt=\"\" class=\"wp-image-194\" srcset=\"https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200222_133450-1024x768.jpg 1024w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200222_133450-300x225.jpg 300w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200222_133450-768x576.jpg 768w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200222_133450-1536x1152.jpg 1536w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200222_133450-2048x1536.jpg 2048w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200222_133450-1200x900.jpg 1200w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/02\/20200222_133450-1980x1485.jpg 1980w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>After mounting and testing the boards had problems, some of the transistors lost connectivity and had to be re-soldered.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200308_125702-1024x768.jpg\" alt=\"\" class=\"wp-image-228\" srcset=\"https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200308_125702-1024x768.jpg 1024w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200308_125702-300x225.jpg 300w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200308_125702-768x576.jpg 768w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200308_125702-1536x1152.jpg 1536w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200308_125702-2048x1536.jpg 2048w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200308_125702-1200x900.jpg 1200w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200308_125702-1980x1485.jpg 1980w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>If it happens again, they will be re-soldered whilst on the heat sink.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200310_173704-1024x768.jpg\" alt=\"\" class=\"wp-image-266\" srcset=\"https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200310_173704-1024x768.jpg 1024w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200310_173704-300x225.jpg 300w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200310_173704-768x576.jpg 768w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200310_173704-1536x1152.jpg 1536w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200310_173704-2048x1536.jpg 2048w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200310_173704-1200x900.jpg 1200w, https:\/\/blog.andytather.co.uk\/wp-content\/uploads\/2020\/03\/20200310_173704-1980x1485.jpg 1980w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Had to re-solder whilst mounted, having fun.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"https:\/\/blog.andytather.co.uk\/index.php\/lm3886-build-thread\/amp-assembly\/\">Next Page: Amp Assembly<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you are a novice builder like myself then at this point it might be a good idea to test the signal path to save re-soldering when the other components are installed. Test continuity with a multi-meter between: J2 (Pin 1) -&gt; Q1 (Center Pin\/Tab) Q2 (Center Pin\/Tab) -&gt; Out1 J2 (Pin 2) -&gt; Q6 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":6,"menu_order":40,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/blog.andytather.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/180"}],"collection":[{"href":"https:\/\/blog.andytather.co.uk\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blog.andytather.co.uk\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blog.andytather.co.uk\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.andytather.co.uk\/index.php\/wp-json\/wp\/v2\/comments?post=180"}],"version-history":[{"count":10,"href":"https:\/\/blog.andytather.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/180\/revisions"}],"predecessor-version":[{"id":327,"href":"https:\/\/blog.andytather.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/180\/revisions\/327"}],"up":[{"embeddable":true,"href":"https:\/\/blog.andytather.co.uk\/index.php\/wp-json\/wp\/v2\/pages\/6"}],"wp:attachment":[{"href":"https:\/\/blog.andytather.co.uk\/index.php\/wp-json\/wp\/v2\/media?parent=180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}