2026-07-15
The TA7642 (AKA ZN414) is a crippled IC.\u00a0 Because it has only 3 leads it can’t act like a normal IC that has an input, output, power and ground.\u00a0 The output has to come out of the power supply pin.\u00a0 It’s limited to only 2 or so volts.\u00a0 As a result this IC can’t have much gain because the output is on the power to the input amplifier!\u00a0 How stupid can you get??\u00a0 If the output was not inverted then the output would cause the input to oscillate.\u00a0 If the output was inverted, then it cancels the input signal and the output is weak.
So instead of using this IC you just use 1 or more transistors to do the job properly and make a real radio.
https:\/\/www.facebook.com\/reel\/1408280181206518\/?mibextid=9drbnH&s=yWDuG2&fs=e<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
2026-07-15 The TA7642 (AKA ZN414) is a crippled IC.\u00a0 Because it has only 3 leads it can’t act like a normal IC that has an input, output, power and ground.\u00a0 The output has to come out of the power supply pin.\u00a0 It’s limited to only 2 or so volts.\u00a0 As a result this IC can’t <\/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":[1],"tags":[],"class_list":["post-21770","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/21770","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=21770"}],"version-history":[{"count":1,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/21770\/revisions"}],"predecessor-version":[{"id":21771,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/21770\/revisions\/21771"}],"wp:attachment":[{"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21770"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21770"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rustybolt.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21770"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}