kupil som si Genius SP-HF 1250B a prestudoval diskusiu o 1250x
vnutro je riesene uplne inak, jedine spolocne su operaky 4558 🙂 ktore planujem vymenit
ako koncovy stupen je pouzity TDA7379 – netusim ci je mozne ho vymenit za nieco lepsie
kontrukcia zdroja je uplne rozdielna
upravy som zacal vytlnenym vnutra bedni, objednal som kondiky na “vyhybku” a operaky na korekcie a predzosilovac
ako to vyzera je tu:
http://www.blog-enceintepc.com/plongee-au-coeur-des-sp-hf1250b/
102 komentářů
Re: Tuning repro Genius SP-HF 1250B
zistenia a moj tuning
zacal som vytlmenim bedni, v tej kde je zosil, nie je moc miesta a zaroven je tam velka cas plosaku kde je 300V
koncak je TDA7379 podobny koncovy stupen som nasiel STA540, katalogove parametre ma rovnake, ci je lepsi ako instalovane TDA7379 neviem, koncak ma na vstupe svitkove kondiky, vymena asi nema zmysel
zdroj: tu je zasadna zmena oproti 1250x… nie je tam klaciky trafak, zenerka, stabilizator atd, ale spinany zdroj s K3569 (10A) a 8 pin suciastka BD5875D 14DAG na ktorej je 300V a netusim co to je 🙂 potom je tam VF trafo, na konci ma schottkyho dioda (20A), potom kondiky a cievky na upravu napatia vystup je 14V
este je tam MB431 stabilizator resp ako nahrada zenerky – pomocny obvod – nepouziva sa v signalnej casti
potom je tam 9V stabilizator pre predzosil/korekcie
upravy zdroja asi nemaju zmysel, vykonove suciastky su dimenzovane na 10A resp usmernovac na 20A, mozno pridanie fitracnej kapacity by pomohlo….
planujem vymenu operakov za OPA2604 a LME49720
tiez kondiky na vyskace
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