{"id":1718,"date":"2013-07-13T10:44:28","date_gmt":"2013-07-13T09:44:28","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=1718"},"modified":"2013-07-13T10:44:28","modified_gmt":"2013-07-13T09:44:28","slug":"improving-the-valve-curve-tracer-part-3","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2013\/07\/13\/improving-the-valve-curve-tracer-part-3\/","title":{"rendered":"Improving the valve curve tracer (part 3)"},"content":{"rendered":"

Didn’t take as long as I thought to build the new anode current sensor<\/a> for the valve curve tracer. A simple PCB was used to solder directly the components for a quick solution. Here is how it looks:<\/p>\n

\"DPP_0008\"<\/a><\/p>\n

 <\/p>\n

\"valve-tracer-sense02\"<\/a><\/p>\n

I tested this new circuit with some valves from high transconductance to low current ones. The current amplifier works like a charm. I used a CCS first to calibrate the x10 output and found a great linearity from 1mA up to 100mA. Currently I used my bench power supply to test this but I’m planning to do some major surgery to the tracer and include this sensor inside the main chassis.<\/p>\n

With a dual 15V supply the AD8479 can work with up to 600V in common mode. This is perfect for my tracer and can be used to sense anode and screen currents.<\/p>\n

\"Tracing <\/a>
Tracing a 49 NOS valve <\/div> <\/div> <\/div> <\/div>
\"The <\/a>
The proof is in the pudding! <\/div> <\/div> <\/div>
\"Wired <\/a>
Wired anode current sensor <\/div> <\/div> <\/div>
\"Curve <\/a>
Curve tracer and new anode current sensor <\/div> <\/div> <\/div> <\/div> <\/div>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Didn’t take as long as I thought to build the new anode current sensor for the valve curve tracer. A simple PCB was used to solder directly the components for a quick solution. Here is how it looks:   I tested this new circuit with some valves from high transconductance to low current ones. The … Continue reading “Improving the valve curve tracer (part 3)”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_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},"jetpack_post_was_ever_published":false},"categories":[24,38,5],"tags":[25,781],"class_list":["post-1718","post","type-post","status-publish","format-standard","hentry","category-valve-curve-tracer","category-valve-tester","category-valves","tag-tube-curve-tracer","tag-valve-curve-tracer"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-rI","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/1718","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/comments?post=1718"}],"version-history":[{"count":5,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/1718\/revisions"}],"predecessor-version":[{"id":1729,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/1718\/revisions\/1729"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=1718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=1718"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=1718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}