{"id":214,"date":"2014-07-26T20:31:51","date_gmt":"2014-07-27T03:31:51","guid":{"rendered":"http:\/\/tubetime.us\/?p=214"},"modified":"2014-07-26T20:31:51","modified_gmt":"2014-07-27T03:31:51","slug":"compensating-crt-deflection-coils","status":"publish","type":"post","link":"https:\/\/www.tubetime.us\/?p=214","title":{"rendered":"Compensating CRT Deflection Coils"},"content":{"rendered":"<p>Things look really weird when you use an uncompensated deflection coil with a vector graphics display. This is because the coil looks like an inductive load to the driver amplifier, and the parasitic capacitance makes it ring. Ringing and overshoot create the strange-looking display, basically extending every line past its destination.<\/p>\n<p><iframe loading=\"lazy\" width=\"500\" height=\"281\" src=\"\/\/www.youtube.com\/embed\/PtxpeOIiFUw\" frameborder=\"0\" allowfullscreen><\/iframe><\/p>\n<p>One way to compensate for that is to add a series RC snubber in parallel with each deflection coil. You can perform some calculations to figure out the values of the resistor and capacitor but they won&#8217;t get you very close to the answer. There are just too many parasitics to model. It&#8217;s much faster just to build a RC substitution box and tweak the values until you get the result you want.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Things look really weird when you use an uncompensated deflection coil with a vector graphics display. This is because the coil looks like an inductive load to the driver amplifier, and the parasitic capacitance makes it ring. Ringing and overshoot create the strange-looking display, basically extending every line past its destination. One way to compensate [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-214","post","type-post","status-publish","format-standard","hentry","category-projects"],"_links":{"self":[{"href":"https:\/\/www.tubetime.us\/index.php?rest_route=\/wp\/v2\/posts\/214","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tubetime.us\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tubetime.us\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tubetime.us\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tubetime.us\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=214"}],"version-history":[{"count":3,"href":"https:\/\/www.tubetime.us\/index.php?rest_route=\/wp\/v2\/posts\/214\/revisions"}],"predecessor-version":[{"id":217,"href":"https:\/\/www.tubetime.us\/index.php?rest_route=\/wp\/v2\/posts\/214\/revisions\/217"}],"wp:attachment":[{"href":"https:\/\/www.tubetime.us\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tubetime.us\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=214"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tubetime.us\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}