{"id":5662,"date":"2020-02-12T03:49:36","date_gmt":"2020-02-12T03:49:36","guid":{"rendered":"https:\/\/41j.com\/blog\/?p=5662"},"modified":"2020-02-12T09:08:56","modified_gmt":"2020-02-12T09:08:56","slug":"philips-hair-clipper-pcb","status":"publish","type":"post","link":"https:\/\/41j.com\/blog\/2020\/02\/philips-hair-clipper-pcb\/","title":{"rendered":"Philips hair clipper PCB"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5661 aligncenter\" src=\"https:\/\/41j.com\/blog\/wp-content\/uploads\/2020\/02\/img_0092.jpg\" width=\"565\" height=\"233\" \/><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5660 aligncenter\" src=\"https:\/\/41j.com\/blog\/wp-content\/uploads\/2020\/02\/img_0093.jpg\" width=\"563\" height=\"196\" \/><\/p>\n<p>The above images show the control PCB from a Philips hair clipper. The board takes a 15v input and controls what looks like a 6v brushed motor.<\/p>\n<p>The PCB has two Suppo 750mAh AAA NiMH cells attached to it. My guess is that U101 is a boost converter for the ~2.4v from the battery. This seems likely given that an inductor sits next to it and given the designation of the inductor (L101).<\/p>\n<p>I also find it interesting that they&#8217;ve gone with a single sided PCB and used 7 zero ohm SMD resistors to bridge traces. I see single sided PCBs in cheap toys a lot. But this board surprisingly has mask and silk. If the single sided board is motivated by cost, then I&#8217;m surprised that there is significant cost benefit&#8230;<\/p>\n<p>I attached a 5v supply to the motor (you can see the red and black wire stubs where the motor attached in the images above). With a 5v supply the motor works as expected.<\/p>\n<p>Close up of the IC. 1CC40 6K731? Looks like this part: <a href=\"https:\/\/www.st.com\/content\/ccc\/resource\/technical\/document\/datasheet\/group3\/71\/e8\/26\/3c\/c8\/cc\/46\/e6\/CD00292360\/files\/CD00292360.pdf\/jcr:content\/translations\/en.CD00292360.pdf\">https:\/\/www.st.com\/content\/ccc\/resource\/technical\/document\/datasheet\/group3\/71\/e8\/26\/3c\/c8\/cc\/46\/e6\/CD00292360\/files\/CD00292360.pdf\/jcr:content\/translations\/en.CD00292360.pdf<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-5665 aligncenter\" src=\"https:\/\/41j.com\/blog\/wp-content\/uploads\/2020\/02\/img_0098.jpg\" width=\"431\" height=\"574\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The above images show the control PCB from a Philips hair clipper. The board takes a 15v input and controls what looks like a 6v brushed motor. The PCB has two Suppo 750mAh AAA NiMH cells attached to it. My guess is that U101 is a boost converter for the ~2.4v from the battery. This [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-5662","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1RRoU-1tk","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/5662","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/comments?post=5662"}],"version-history":[{"count":5,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/5662\/revisions"}],"predecessor-version":[{"id":5668,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/5662\/revisions\/5668"}],"wp:attachment":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/media?parent=5662"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/categories?post=5662"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/tags?post=5662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}