{"id":1776,"date":"2015-07-17T01:39:31","date_gmt":"2015-07-17T08:39:31","guid":{"rendered":"http:\/\/micromouseusa.com\/?p=1776"},"modified":"2015-09-21T17:58:42","modified_gmt":"2015-09-22T00:58:42","slug":"use-a-even-smaller-buzzer","status":"publish","type":"post","link":"http:\/\/micromouseusa.com\/?p=1776","title":{"rendered":"Use a even smaller buzzer"},"content":{"rendered":"

\"SMT-0440<\/a><\/p>\n

Around all micromouse players in the world, the magnetic buzzer from PUI Audio SMT-0540 is the most commonly used for a long time due to its compact size and great sound quality. The package yields 5x5x2.1mm size which is the smallest I can find with proper power supply range and loudness.<\/p>\n

Earlier this week I recieved an E-mail from digikey about the release of the new version of PUI’s mini buzzer: SMT-0440.<\/p>\n

Explained by its name, SMT-0440 is sized at 4x4x2.1mm compare to 5x5x2.1 for SMT-0540. It also removed the dummy pin that on the SMT-0540, therefore only 2 solder leads are remaining for SMT-0440 which makes the solder pad more like a regular SMD inductor now(Although magnetic buzzer is essentially a inductor).<\/p>\n

This is defenitely a good news for me since the smaller size will always be helpful for PCB design with limited space, such as half-size micromouse.<\/p>\n

Other than the size difference, the output power level is also slightly lower than SMT-0540 as a trade off with a smaller size.<\/p>\n

Here are the differences between SMT-0440 and SMT-0540:<\/p>\n

Model: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0 \u00a0\u00a0 SMT-0440<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SMT-0540<\/span><\/strong><\/p>\n

Sound Pressure Level:\u00a0\u00a0 70dB @ 3V, 10cm<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0 78dB @ 3V, 10cm<\/span><\/strong><\/p>\n

Current Supply:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0 90mA<\/span>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 100mA<\/span><\/strong><\/p>\n

\"smt-0440<\/a><\/p>\n

The picture above shows the size difference in layout mode in Cadsoft Eagle.<\/p>\n

Notice there are 2 sub versions of SMT-0440 where one is SMT-0440-T-R which has a hold of the top for sound to come out, and the other one SMT-0440-S-R, has its sound hold on the size(only on one side).<\/p>\n

It’s a lit late for me to use SMT-0440 for my GreenGiant V4.3 mouse since I’ve already complete the design. However, I will definitely use it for Green Giant V 4.4 since I am planning to integrate a Bluetooth 4.0 IC along with either external vertical antenna of on board ceramic antenna(no invert F antenna because there is no space available at all \ud83d\ude41 ) on my existing extremely compact PCB. It is always challenging to put more stuff within the same space, isn’t it? \ud83d\ude42<\/p>\n

I can’t wait to use this tiny creature on my next project.<\/p>\n","protected":false},"excerpt":{"rendered":"

Around all micromouse players in the world, the magnetic buzzer from PUI Audio SMT-0540 is the most commonly used for a long time due to its compact size and great sound quality. The package yields 5x5x2.1mm size which is the … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[8,10],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"http:\/\/micromouseusa.com\/index.php?rest_route=\/wp\/v2\/posts\/1776"}],"collection":[{"href":"http:\/\/micromouseusa.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/micromouseusa.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/micromouseusa.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/micromouseusa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1776"}],"version-history":[{"count":11,"href":"http:\/\/micromouseusa.com\/index.php?rest_route=\/wp\/v2\/posts\/1776\/revisions"}],"predecessor-version":[{"id":1790,"href":"http:\/\/micromouseusa.com\/index.php?rest_route=\/wp\/v2\/posts\/1776\/revisions\/1790"}],"wp:attachment":[{"href":"http:\/\/micromouseusa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/micromouseusa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1776"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/micromouseusa.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}