{"id":15068,"date":"2022-05-13T14:12:21","date_gmt":"2022-05-13T21:12:21","guid":{"rendered":"https:\/\/www.vernier.com\/til\/?p=15068"},"modified":"2022-05-13T14:12:22","modified_gmt":"2022-05-13T21:12:22","slug":"how-does-labquest-offset-the-input-signal-to-the-power-amplifier","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/15068","title":{"rendered":"How does LabQuest offset the input signal to the Power Amplifier?"},"content":{"rendered":"<p>The <a href=\"\/product\/power-amplifier\/\">Power Amplifier<\/a> (<nobr>PAMP<\/nobr>) was designed to produce both DC and AC output voltages by taking advantage of both channels of a 3.5 mm audio cable, the cable it ships with and with which you connect the Power Amplifier to a LabQuest interface. A typical 3.5 mm audio cable has three connectors: the tip, ring, and sleeve. The Power Amplifier and LabQuest use the sleeve for ground. The tip and ring are used for:<\/p>\n<ul class=\"wp-block-list\">\n<li>Tip: Output signal with an overall gain 10X<\/li>\n<li>Ring: Pulse Width Modulation (PWM) signal input producing a DC offset or pure DC output with a LabQuest<\/li>\n<\/ul>\n<p><strong>Note:<\/strong> Because of this design arrangement, when driving the Power Ampilfier with signal other than LabQuest, use a mono audio cable so the PWM input on the ring will be grounded. Using a stereo audio connector may enable the PWM features of the Power Amplifier with undesirable results.<\/p>\n<p><strong>Related TILs<\/strong><br \/><a href=\"\/til\/1986\/\">Power Amplifier Troubleshooting and FAQs<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>The was designed to produce both DC and AC output voltages by taking advantage of both channels of a 3.5 mm audio cable, the cable&#8230;<\/p>\n","protected":false},"author":100811,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[7630,1652],"class_list":["post-15068","post","type-post","status-publish","format-standard","hentry","tag-fgen-pamp","tag-pamp"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/15068","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/users\/100811"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=15068"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/15068\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=15068"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=15068"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=15068"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}