{"id":5772,"date":"2020-05-17T15:48:40","date_gmt":"2020-05-17T15:48:40","guid":{"rendered":"http:\/\/41j.com\/blog\/?p=5772"},"modified":"2020-05-17T17:16:43","modified_gmt":"2020-05-17T17:16:43","slug":"sony-ccd-v8af-video-camera-recorder-viewfinder-crt-notes","status":"publish","type":"post","link":"https:\/\/41j.com\/blog\/2020\/05\/sony-ccd-v8af-video-camera-recorder-viewfinder-crt-notes\/","title":{"rendered":"Sony CCD-V8AF Video Camera Recorder &#8211; Viewfinder CRT Notes"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"1280\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2020\/05\/photo_2020-05-18_00-43-36.jpg\" alt=\"\" class=\"wp-image-5773\"\/><\/figure>\n\n\n\n<p>The viewfinder CRT from this video camera is a bit harder to interface with generate an X\/Y input for. While the vertical can be driven with +\/- 10V from a function generator, the horizontal requires higher voltages.<\/p>\n\n\n\n<p>As for the modules previously described, this also takes a 5v input ~100mA. A few other lines need to be pulled up\/down to get the CRT to start. Wiring is shown below:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"959\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2020\/05\/photo_2020-05-18_00-43-29.jpg\" alt=\"\" class=\"wp-image-5774\"\/><\/figure>\n\n\n\n<p>The problem with this board that the horizontal requires ~30v, so you need to source this from somewhere. On the board, this is generated by an inductor (bottom right in the image above). The inductor is fed with 5v. There&#8217;s a transistor a (Q009) which I think probably creates a path to ground for this inductor causing a short voltage spike (which hits ~30v). This is what appears to drive the horizontal deflection on this board.<\/p>\n\n\n\n<p>Because of the way it&#8217;s generated, it&#8217;s not possible to re-purpose the circuitry to amplify an input signal to drive the horizontal deflection&#8230; so an external amplifier etc. will be required.<\/p>\n\n\n\n<p>Update: This is now working fine with +\/- 6v (H?) and +\/-3v. Q009 in addition to controlling the H sweep also seems to turn the beam on\/off. However&#8230; I fiddled with the pot in the top left and everything seems to be working fine. I also removed the inductor&#8230; but I don&#8217;t think this is necessary. So it was probably working&#8230; just dim all the time.<\/p>\n\n\n\n<p>Depending on the drive frequency, you can see the beam cut out. I&#8217;m wondering if it&#8217;s possible to just leave the beam on all the time, but the HV generator may not be designed to do this&#8230;.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"1280\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2020\/05\/photo_2020-05-18_00-43-24.jpg\" alt=\"\" class=\"wp-image-5775\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1280\" height=\"1261\" src=\"http:\/\/41j.com\/blog\/wp-content\/uploads\/2020\/05\/photo_2020-05-18_00-43-03.jpg\" alt=\"\" class=\"wp-image-5776\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The viewfinder CRT from this video camera is a bit harder to interface with generate an X\/Y input for. While the vertical can be driven with +\/- 10V from a function generator, the horizontal requires higher voltages. As for the modules previously described, this also takes a 5v input ~100mA. A few other lines need [&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-5772","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1RRoU-1v6","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/5772","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=5772"}],"version-history":[{"count":2,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/5772\/revisions"}],"predecessor-version":[{"id":5778,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/5772\/revisions\/5778"}],"wp:attachment":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/media?parent=5772"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/categories?post=5772"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/tags?post=5772"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}