{"id":2972,"date":"2023-01-24T12:21:00","date_gmt":"2023-01-24T01:21:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2023\/01\/24\/update-on-high-school-direct-conversion-receiver-project-asc-file\/"},"modified":"2025-07-22T18:02:54","modified_gmt":"2025-07-22T08:02:54","slug":"update-on-high-school-direct-conversion-receiver-project-asc-file","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2023\/01\/24\/update-on-high-school-direct-conversion-receiver-project-asc-file\/","title":{"rendered":"Update on High School Direct Conversion Receiver Project + .asc File"},"content":{"rendered":"

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<\/b>So far, in response to my recent request for testing, no one has stepped up to build the DC receiver Dean KK4DAS and I are testing out. We did get a couple of comments explaining why guys are opting not to help, but so far no other builders are actually melting solder in response to our recent request. <\/b><\/p>\n

So Dean and I decided to each build second versions of the receiver. That will bring the total finished build population to 4. I finished my second version yesterday. Picture above. It works great. <\/b><\/p>\n

One change: The emitter resistor on the final AF amp was too low in value. The transistor and the transformer were getting hot. I switched from 10 ohms to 100 ohms and the problem disappeared. I have made the change on the LTSpice Schematic. Here is the .asc file (I hope!) : <\/b><\/p>\n

http:\/\/soldersmoke.com\/DCRX.asc<\/b><\/a><\/p>\n

Dean posted the .asc file (and some other info) here: <\/b><\/p>\n

http:\/\/bit.ly\/3WAFfLI<\/b><\/a><\/span><\/p>\n

If you have trouble accessing that file, please let me know and I will try to e-mail it to you. In any case the schematic appears here: <\/b><\/p>\n

https:\/\/soldersmoke.blogspot.com\/2023\/01\/a-call-for-builders-please-help-us-test.html<\/b><\/a><\/p>\n

You will notice that this Spice schematic actually works! The PTO turns on, and I put a simulated RF signal at the antenna port. Audio appears at the output. <\/b><\/p>\n

Time is getting very tight. Dean and I will begin presenting this project to the high school students on February 2. So it is not too late to help. But helping is, of course, strictly voluntary — if you are reluctant to build this thing, DON’T! <\/b><\/p>\n","protected":false},"excerpt":{"rendered":"

So far, in response to my recent request for testing, no one has stepped up to build the DC receiver Dean KK4DAS and I are testing out. We did get a couple of comments explaining why guys are opting not to help, but so far no other builders are actually melting solder in response to … Continue reading “Update on High School Direct Conversion Receiver Project + .asc File”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":2973,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35,90,12],"tags":[],"class_list":["post-2972","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-direct-conversion","category-souleles-dean","category-tj-dc-rx"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2972","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=2972"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2972\/revisions"}],"predecessor-version":[{"id":2974,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2972\/revisions\/2974"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/2973"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=2972"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=2972"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=2972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}