{"id":1655,"date":"2020-01-02T17:08:54","date_gmt":"2020-01-02T15:08:54","guid":{"rendered":"http:\/\/lz4ny.eu\/?p=1655"},"modified":"2020-10-27T21:31:07","modified_gmt":"2020-10-27T19:31:07","slug":"fm-usilvatel-na-moshtnost-za-88-108-mhz-sas-bly87a-bly89a-kt920a-kt925b","status":"publish","type":"post","link":"https:\/\/lz4ny.bulinfo.eu\/en\/fm-usilvatel-na-moshtnost-za-88-108-mhz-sas-bly87a-bly89a-kt920a-kt925b\/","title":{"rendered":"FM Power Amplifier 88 – 108 MHz with BLY87A, BLY89A, KT920A, KT925B"},"content":{"rendered":"

<\/p>\n

FM Power Amplifier 88 – 108 MHz with BLY87A, BLY89A, KT920A, KT925B<\/strong><\/h2>\n

A very simple fm power amplifier which can deliver 4W rf power with 12V power supply and BLY87A or KT920A and 20W with BLY89A or KT925B.
\nIf you use BLY87A or KT920A the input power must be 0.5W and 4W if you use BLY89A or KT925B. This fm power amplifier is designed to work on 50 \u03a9 antennas and a maximum power supply of 14V and in 88 108 MHz band.
\n<\/span><\/p>\n

Use only metallic trimmers, a good heatsink for the transistor and ceramic capacitors and keep the pins very short.<\/p>\n

FM power amplifier circuit components<\/strong>:
\nC1 = C8 = 10-40pF + 22pF in parallel ||
\nC2 = 10-70pF + 120pF ||
\nC3 = 2.2nF
\nC4 = 33nF
\nC5 = 4 x 180pF
\nC6 = 1nF
\nC7 = 2.2nF
\nC9 = 10-70pF + 47pF ||
\nR1 = 380\u03a9
\nR2 = 47\u03a9
\nR3 = 5.6 \u03a9
\nL1 = 3 turns \/ 0.8mm \/ 6mm \/ legth = 8mm
\nL2 = 6turns \/ 0.5mm \/over R2
\nL3 = 5 t \/ 0.6mm \/ 6mm
\nL4 = 4 t \/ 1.2mm \/ 8mm
\nT = 4W with BLY87A, KT920A
\nT = 20W with BLY89A, KT925B<\/p>\n

FM amplifier circuit schematic<\/strong><\/h2>\n

\"\"<\/p>\n

 <\/p>\n

Source from: electroschematics<\/a><\/em><\/p>\n

ATTENTION !!!<\/span> Broadcasting in these frequencies is prohibited by law and you must have a special license !!!<\/span><\/span><\/em><\/strong><\/p>\n

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

A very simple fm power amplifier which can deliver 4W rf power with 12V power supply and BLY87A or KT920A and 20W with BLY89A or KT925B. Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":49,"featured_media":1656,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":""},"categories":[6,4,5,7],"tags":[24,28,27,23,25,26,29],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/lz4ny.bulinfo.eu\/wp-content\/uploads\/2020\/01\/4-20w-fm-power-amplifier.gif","jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8ff2h-qH","_links":{"self":[{"href":"https:\/\/lz4ny.bulinfo.eu\/en\/wp-json\/wp\/v2\/posts\/1655"}],"collection":[{"href":"https:\/\/lz4ny.bulinfo.eu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lz4ny.bulinfo.eu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lz4ny.bulinfo.eu\/en\/wp-json\/wp\/v2\/users\/49"}],"replies":[{"embeddable":true,"href":"https:\/\/lz4ny.bulinfo.eu\/en\/wp-json\/wp\/v2\/comments?post=1655"}],"version-history":[{"count":0,"href":"https:\/\/lz4ny.bulinfo.eu\/en\/wp-json\/wp\/v2\/posts\/1655\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lz4ny.bulinfo.eu\/en\/wp-json\/wp\/v2\/media\/1656"}],"wp:attachment":[{"href":"https:\/\/lz4ny.bulinfo.eu\/en\/wp-json\/wp\/v2\/media?parent=1655"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lz4ny.bulinfo.eu\/en\/wp-json\/wp\/v2\/categories?post=1655"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lz4ny.bulinfo.eu\/en\/wp-json\/wp\/v2\/tags?post=1655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}