{"id":11946,"date":"2017-05-04T13:26:40","date_gmt":"2017-05-04T20:26:40","guid":{"rendered":"https:\/\/rustybolt.info\/wordpress\/?p=11946"},"modified":"2017-05-06T07:36:36","modified_gmt":"2017-05-06T14:36:36","slug":"2017-05-03-interrupting-the-supply-v-to-the-oscillator","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=11946","title":{"rendered":"2017-05-04 Interrupting The Supply V to the Oscillator"},"content":{"rendered":"

I was working on the 27 MHz oscillator for testing the regens, and I thought it would be a good idea to turn the carrier off for a small fraction of a second every 1 or so seconds.  So I built a two transistor flasher with a third transistor to invert the pulses.  Instead of mostly off with an on pulse every second, the output is mostly on with a very short off interruption every second.<\/p>\n

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I built the circuit and I put a LED on the output and found that it was always off unless I touched the base of the first transistor.  I found that the two transistors had too much gain, so I added the 22k resistor as a collector load resistor for the first transistor.  The circuit started working properly.  The interruption rate is 1.4 per second.<\/p>\n

I got the Suntech AM-FM-SW Radio for $20.  It’s so cheap and the performance is seriously lacking.  The FM band has images that seem as strong as the stations, so I put the extendable antenna down, and the performance wasn’t as bad.  But then I can’t hear the difference between the quiet spots on the dial and the unmodulated carrier of my oscillator.   So now I have my oscillator powered by the interruptor circuit, and the short interruptions make it easy to tell the difference between the carrier and other signals.<\/p>\n","protected":false},"excerpt":{"rendered":"

I was working on the 27 MHz oscillator for testing the regens, and I thought it would be a good idea to turn the carrier off for a small fraction of a second every 1 or so seconds.  So I built a two transistor flasher with a third transistor to invert the pulses.  Instead of <\/p>\n

(Read More…)<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[142,264],"tags":[],"class_list":["post-11946","post","type-post","status-publish","format-standard","hentry","category-flashers-and-attention-getters","category-power-supplies-2"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/11946","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=11946"}],"version-history":[{"count":5,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/11946\/revisions"}],"predecessor-version":[{"id":11965,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/11946\/revisions\/11965"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11946"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11946"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11946"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}