{"id":316,"date":"2017-05-04T23:37:27","date_gmt":"2017-05-04T21:37:27","guid":{"rendered":"https:\/\/sharedinventions.com\/?p=316"},"modified":"2018-06-23T14:17:12","modified_gmt":"2018-06-23T12:17:12","slug":"bluetooth-amplifier-case","status":"publish","type":"post","link":"https:\/\/sharedinventions.com\/?p=316","title":{"rendered":"Bluetooth Amplifier case"},"content":{"rendered":"<p>It seams, that it is very popular now to build portable bluetooth boomboxes. I already have made an active speaker set, but it does not provide bluetooth connection, and while it was designed to portable, it does not contains battery.<\/p>\n<p>So now I wanted to have a more portable one with bluetooth support.<br \/>\n<iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/e29SnjxuL3Q\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><br \/>\nThe <a href=\"https:\/\/rover.ebay.com\/rover\/1\/711-53200-19255-0\/1?icep_id=114&amp;ipn=icep&amp;toolid=20004&amp;campid=5338330151&amp;mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2FTDA7492P-2-25W-Bluetooth-V2-1-Audio-Receiver-Amplifier-Module-AUX-Interface%2F331964044967%3Fhash%3Ditem4d4a9956a7%3Ag%3ADLUAAOSwA3dYeGgA\">TDA7492P amp + BT module<\/a> seams to be a good candidate for the project.<\/p>\n<p>&nbsp;<\/p>\n<h2>Introduction<\/h2>\n<p>The box has this retro look, with a nice wood finish. It contains the BT amplifier module, but does not contains any speakers, just speaker terminals.<\/p>\n<p>I can power it with a (rechargeable) cordless-drill battery, or from an external power supply. There is an AUX input as well.<\/p>\n<p>The front face is 3D-printed from translucent material, so the indicator lights are visible.<\/p>\n<h2>Design consideration<\/h2>\n<h3>Battery<\/h3>\n<p>I have seen people are using all kind of battery solutions for their portable boomboxes, but I did not liked any of them. This module can easily pick up some 10 watts, so a small LiPo charger module is not capable for the job. Bigger lithium batteries costs way too much, and requires a special charger unit, that I do not own. The best would be a lead-acid battery, but they are too heavy.<\/p>\n<p>So I looked around, and realized, that I already have a charger: a charger for my cordless drill. And the best in it, this type of batteries are compatible with a wide range of tools, and even show the charging level.<\/p>\n<p>So for the portable operation a wireless-drill battery will be used.<\/p>\n<h3>Speakers<\/h3>\n<p>As I normally use external speakers, I decided not to include the speakers this time in the case. I just provided mounting terminals for external speakers.<\/p>\n<p>Anyways, if I want a good portable BT boombox it would be probably the best idea to buy a good quality product.<\/p>\n<h3>Retro look or modern design<\/h3>\n<p>Overall I very much like the wood look of the retro radios, amplifiers. But the battery I&#8217;m about to use with has a very futuristic design. So, I wanted to combine the both: have some retro shape, and paint it gray, black and silver. But at the very last moment, I just couldn&#8217;t let the nice wood grain covered with paint. So it does not look well with the battery, but I guess most of the times it will be seen standalone.<\/p>\n<p>I have seen some radios with vents on the side, so to add a bit of futuristic look, I have added decor-peaces to the sides.<\/p>\n<h2>Design<\/h2>\n<p>I have needed a snap-on connector for my battery, and fortunately I have found a 3D object for this already prepared, so really all I needed to do is to print it out.<\/p>\n<blockquote><p>Snap-on for Ryobi One+ batteries: <a href=\"https:\/\/www.thingiverse.com\/thing:985646\">https:\/\/www.thingiverse.com\/thing:985646<\/a><\/p><\/blockquote>\n<p>I made the arrangement around this base.<\/p>\n<p>While designing the shape of the case, I was inspired by <a href=\"http:\/\/www.thingiverse.com\/thing:1887011\">a design<\/a>, where it operates with flat surfaces.<\/p>\n<p><a href=\"https:\/\/sharedinventions.com\/?attachment_id=320\" rel=\"attachment wp-att-320\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-320\" src=\"https:\/\/sharedinventions.com\/wp-content\/uploads\/2017\/04\/BtAmpCaseB01.png\" alt=\"\" width=\"2880\" height=\"1510\" \/><\/a><\/p>\n<blockquote><p>Download the 3D design and the plans from: http:\/\/www.thingiverse.com\/thing:2267390<\/p><\/blockquote>\n<p>&nbsp;<\/p>\n<h2>Building steps<\/h2>\n<h3>Body<\/h3>\n<p>I always like to try out new techniques, so I thought it is worth to highlight some building steps.<\/p>\n<p>So I had all my designed faces cut, all the parts 3D-printed, I can begin the assembly.<\/p>\n<p>First cut the holes for the decor pieces and the auxiliary input.<\/p>\n<p>Then glued the holding pieces to the sides.<\/p>\n<p>I needed to get rid of the speaker connectors to spare place, so I also desoldered the DC plug.<\/p>\n<p>To attach the electronics to the front, first I have screwed all the legs to the board, then used some drops of ABS dissolved in acetone.<\/p>\n<p>This beveled design was a bit tricky to assemble. First I taped all sides to its place, then mount the battery-piece to the bottom side.<\/p>\n<p>At this point I have removed the back side, to glue pieces on the top, that will match with the sides. I really wanted to avoid to have visible screws on the sides, but I couldn&#8217;t found a way for that.<\/p>\n<p>Then the back was mounted.<\/p>\n<p>Actually all holes are was just pre-drilled at this point. When applied the final sized drill-bit, I was forcing the hole to be a bit towards from the edges, to have a better seal where two sides will meet.<\/p>\n<p>Now it was time to attach the power switch. Again I have used lots of dissolved ABS to form a nest for the switch, and then glue it in it&#8217;s place.<\/p>\n<p>I nearly forgot to make hole for the DC connector.<\/p>\n<p>And this was the point where I decided not to paint everything to gray, but the wood was already covered with a coat of transparent stain. So I needed to add several coats of colored stain for the final look. First I used brushes, but then I switched to a piece of sponge, and that made a much more natural look.<\/p>\n<p>Then I have spray-painted all the areas, where I wanted to have a silver finish. All the edges, the decorative pieces, and the grills. At the front I had an unwanted spot, but I could remove it with alcohol, as the paint was not completely dry.<\/p>\n<p>I have glued a black material to the back side of the grills.<\/p>\n<h3>Electronics<\/h3>\n<p>For the battery terminals I have used some copper strips (bought in a craft-store). A foam piece will apply pressure to \u00a0 the contacts.<\/p>\n<p>And started to wiring up the things. The ground terminal of the three legged DC socket will connects to the &#8220;third&#8221; leg, when no plug is inserted.<\/p>\n<p>As a final touch, I have labeled the ports.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It seams, that it is very popular now to build portable bluetooth boomboxes. I already have made an active speaker set, but it does not provide bluetooth connection, and while it was designed to portable, it does not contains battery. So now I wanted to have a more portable one with bluetooth support. The TDA7492P\u2026 <span class=\"read-more\"><a href=\"https:\/\/sharedinventions.com\/?p=316\">Read More &raquo;<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":341,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,12],"tags":[],"class_list":["post-316","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-audio","category-projects"],"_links":{"self":[{"href":"https:\/\/sharedinventions.com\/index.php?rest_route=\/wp\/v2\/posts\/316","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sharedinventions.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sharedinventions.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sharedinventions.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sharedinventions.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=316"}],"version-history":[{"count":14,"href":"https:\/\/sharedinventions.com\/index.php?rest_route=\/wp\/v2\/posts\/316\/revisions"}],"predecessor-version":[{"id":656,"href":"https:\/\/sharedinventions.com\/index.php?rest_route=\/wp\/v2\/posts\/316\/revisions\/656"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sharedinventions.com\/index.php?rest_route=\/wp\/v2\/media\/341"}],"wp:attachment":[{"href":"https:\/\/sharedinventions.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=316"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sharedinventions.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=316"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sharedinventions.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=316"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}