{"id":6566,"date":"2019-12-18T19:52:41","date_gmt":"2019-12-18T18:52:41","guid":{"rendered":"http:\/\/www.crowave.com\/blog\/?p=6566"},"modified":"2021-05-27T11:24:06","modified_gmt":"2021-05-27T10:24:06","slug":"stereo-pojacalo-dynavox-spark-ii-mk","status":"publish","type":"post","link":"https:\/\/www.crowave.com\/blog\/2019\/12\/18\/stereo-pojacalo-dynavox-spark-ii-mk\/","title":{"rendered":"Stereo poja\u010dalo Dynavox Spark II MK"},"content":{"rendered":"<p>Danas je nabavljeno mini HiFi stereo poja\u010dalo Dynavox Spark II MK, proizvod njema\u010dke tvrtke Sintron Vertriebs GmbH iz 2010-tih godina.<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_01.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-6567\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_01.jpg\" alt=\"\" width=\"808\" height=\"812\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_01.jpg 808w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_01-150x150.jpg 150w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_01-300x300.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_01-768x772.jpg 768w\" sizes=\"auto, (max-width: 808px) 100vw, 808px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_02.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-6568\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_02.jpg\" alt=\"\" width=\"871\" height=\"832\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_02.jpg 871w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_02-300x287.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_02-768x734.jpg 768w\" sizes=\"auto, (max-width: 871px) 100vw, 871px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_04.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6570\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_04-1024x532.jpg\" alt=\"\" width=\"1024\" height=\"532\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_04-1024x532.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_04-300x156.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_04-768x399.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_04.jpg 1073w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_03.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-6569\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_03.jpg\" alt=\"\" width=\"812\" height=\"820\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_03.jpg 812w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_03-150x150.jpg 150w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_03-297x300.jpg 297w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_03-768x776.jpg 768w\" sizes=\"auto, (max-width: 812px) 100vw, 812px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_05.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6571\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_05-1024x607.jpg\" alt=\"\" width=\"1024\" height=\"607\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_05-1024x607.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_05-300x178.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_05-768x455.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_05.jpg 1070w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Njema\u010dka tvrtka \u00a0Sintron Vertriebs GmbH osnovana je 1994. godine i bavi se proizvodnjom i distribucijom velikog broja artikala iz podru\u010dja komercijalne elektronike za razli\u010dite brendove, me\u0111u kojima je i njema\u010dki Dynavox sa proizvodima iz podru\u010dja komercijalne HiFi audio tehnike.<\/p>\n<p>Poja\u010dalo Spark II MK spada u moderne proizvode (jo\u0161 uvijek se proizvodi) no nama se u\u010dinilo zanimljivo zbog specifi\u010dnog metalnog ku\u0107i\u0161ta koje mo\u017ee odli\u010dno poslu\u017eiti za neki elektroni\u010dki projekt. Specifikacije proizvo\u0111a\u010da za ovo poja\u010dalo su slijede\u0107e:<\/p>\n<ul>\n<li>linearni frekvencijski raspon poja\u010danja: 20 Hz &#8211; 20 kHz (razlika poja\u010danja unutar 0,5 dB)<\/li>\n<li>izlazna snaga: 2&#215;30 W (na 8 \u2126 optere\u0107enja)<\/li>\n<li>THD (ukupno harmoni\u010dno izobli\u010denje): 0,1% (mjereno signalom 1 kHz na snazi 1 W)<\/li>\n<li>odnos signal-\u0161um: 88 dB<\/li>\n<\/ul>\n<p>Poja\u010dalo se napaja izravno iz mre\u017ee 230 V, a potro\u0161nja je 48 W. Ima jedan stereo ulaz i jedan stereo izlaz. Za ulazni signal ugra\u0111ena je atenuatorska sklopka (SIGNAL IN LOW-HIGH) kojom se prilago\u0111ava impedancija ulaznih signala 200\/750 mV. Od mogu\u0107nosti korekcije tona na raspolaganju su potenciometri BASS (isticanje niskih frekvencija) i TREBLE (isticanje visokih frekvencija), a dodana je i sklopka 3D kojom se uklju\u010duje filtar za simulaciju surround efekta sa dva stereo zvu\u010dnika. RCA (cinch) priklju\u010dnice na zadnjoj strani (AUDIO INPUT OUTPUT) zapravo su paralelno vezane i slu\u017ee samo za eventualno dijeljenje ulaznog signala sa nekim drugim audio ure\u0111ajem. Dimenzije ku\u0107i\u0161ta su 100 x 100 x 235 mm. Poja\u010dalo Spark II MK dizajnirano je kao zamjena za klasi\u010dne jeftine aktivne zvu\u010dnike koje dolaze uz ra\u010dunala, dakle za poja\u010davanje izlaznog zvuka iz ra\u010dunalnih zvu\u010dnih kartica na neke bolje vanjske zvu\u010dnike.<\/p>\n<p>Poja\u010dalo Spark II MK danas se mo\u017ee kupiti za cijenu od cca 70 Eura pa pogledajmo \u0161to se dobiva za taj novac.<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_06.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6572\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_06-1024x779.jpg\" alt=\"\" width=\"1024\" height=\"779\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_06-1024x779.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_06-300x228.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_06-768x585.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_06.jpg 1080w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_08.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6574\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_08-1024x768.jpg\" alt=\"\" width=\"1024\" height=\"768\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_08-1024x768.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_08-300x225.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_08-768x576.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_08.jpg 1152w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_07.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-6573\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_07.jpg\" alt=\"\" width=\"648\" height=\"486\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_07.jpg 648w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_07-300x225.jpg 300w\" sizes=\"auto, (max-width: 648px) 100vw, 648px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_09.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6575\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_09-1024x714.jpg\" alt=\"\" width=\"1024\" height=\"714\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_09-1024x714.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_09-300x209.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_09-768x535.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_09.jpg 1060w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_10.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6576\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_10-1024x736.jpg\" alt=\"\" width=\"1024\" height=\"736\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_10-1024x736.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_10-300x216.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_10-768x552.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_10.jpg 1074w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_11.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6577\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_11-1024x754.jpg\" alt=\"\" width=\"1024\" height=\"754\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_11-1024x754.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_11-300x221.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_11-768x565.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_11.jpg 1103w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_12.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6578\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_12-1024x786.jpg\" alt=\"\" width=\"1024\" height=\"786\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_12-1024x786.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_12-300x230.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_12-768x589.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_12.jpg 1105w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_13.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6579\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_13-1024x768.jpg\" alt=\"\" width=\"1024\" height=\"768\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_13-1024x768.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_13-300x225.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_13-768x576.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_13.jpg 1152w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_14.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6580\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_14-1024x768.jpg\" alt=\"\" width=\"1024\" height=\"768\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_14-1024x768.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_14-300x225.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_14-768x576.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_14.jpg 1152w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_15.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-6581\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_15-1024x768.jpg\" alt=\"\" width=\"1024\" height=\"768\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_15-1024x768.jpg 1024w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_15-300x225.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_15-768x576.jpg 768w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_15.jpg 1152w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>Vidimo da se radi o protufaznom (push-pull) poja\u010dalu u AB klasi sa komplementarnim parom tranzistora BD243C\/BD244C u izlaznom stupnju po svakom kanalu. Na svaki kanal otpada jo\u0161 12 tranzistora od kojih su 4 vjerojatno u stupnju pretpoja\u010dala dok su ostali u sklopu drajvera za izlazni stupanj, termi\u010dke stabilizacije, za\u0161tite od kratkog spoja izlaznog stupnja i sli\u010dno. Integrirani krug TL074C sadr\u017ei 4 operacijska poja\u010dala, najvjerojatnije dva za svaki kanal od kojih jedno radi kao pretpoja\u010dalo ulaznog signala, a drugo u krugu tonske kontrole. Ugodno nas je iznenadilo kvalitetno napajanje sa toroidnim mre\u017enim transformatorom, no zanimljivo je da se \u010ditavo poja\u010dalo bazira na tranzistorima umjesto, kako je to danas uobi\u010dajeno, na nekim linearnim integriranim krugovima specijaliziranim za audio poja\u010dala.<\/p>\n<p>Pri pogledu na plo\u010dice svakako upadaju u o\u010di termi\u010dka o\u0161te\u0107enja oko tranzistora na jednom kanalu poja\u010dala. Sli\u010dno o\u0161te\u0107enje ne\u0161to bla\u017eeg intenziteta uo\u010dava se i na plo\u010dici ispravlja\u010da. Ispravlja\u010d je vrlo jednostavan i sastoji se od 4 diode za punovalno ispravljanje i od po jednog filtarskog kondenzatora 3300 \u00b5F po kanalu. Mre\u017eni transformator daje na izlazu 2&#215;20 V\u2248 (izmjereno 2&#215;21,4 V\u2248), a nakon ispravljanja i filtriranja taj napon na izlaznim stezaljkama u praznom hodu iznosi 2&#215;30 V. Ovim naponom napaja se izlazno poja\u010dalo, no za rad operacijskog poja\u010dala TL074C maksimalni napon napajanja je 2&#215;18 V. Stoga je u ispravlja\u010du u posebnoj grani napon sa 2&#215;30 V smanjen na (izmjerenih) 2&#215;12,8 V a to je postignuto jednostavnim otpornicima na kojima nastaje potrebni pad napona. Po kanalu su paralelno spojena dva otpornika od 1 k\u2126 dakle ukupni otpor je 500 \u2126. Ako sad malo ra\u010dunamo sa poznatim podacima, dobivamo slijede\u0107e:<\/p>\n<ul>\n<li>ulazni napon &#8211; 30 V<\/li>\n<li>izlazni napon &#8211; 12,8 V<\/li>\n<li>otpornik &#8211; 500 \u2126<\/li>\n<li>struja &#8211; 34,4 mA<\/li>\n<li>snaga otpornika &#8211; 0,6 W<\/li>\n<\/ul>\n<p>Na\u0161i otpornici su vjerojatno snage 0,25 W, dakle ukupno 0,5 W pa bi se u ovom slu\u010daju isti prili\u010dno grijali i brzo pregorjeli. Ne\u0107emo spajati poja\u010dalo na napajanje jer je o\u010dito neispravno, no realno, ukoliko napon napajanja sa 30 V u praznom hodu padne na npr. 25 V, tada su ve\u0107 dovoljni otpornici snage 0,3 W uz maksimalnu struju od 24 mA \u0161to je sasvim dovoljno jer operacijsko poja\u010dalo \u00a0TL074C tro\u0161i najvi\u0161e 10 mA struje kada su sva \u010detiri poja\u010dala u punom pogonu. Mogu\u0107e da se otpornici i na ovom optere\u0107enju malo griju i s vremenom stvaraju zatamnjenja na tiskanoj plo\u010dici, no sada je nezahvalno izvoditi bilo kakve zaklju\u010dke prije nego se utvrdi maksimalni napon napajanja tijekom redovnog pogona.<\/p>\n<p><a href=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_16.jpg\" rel=\"lightbox[6566]\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-6582\" src=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_16.jpg\" alt=\"\" width=\"1020\" height=\"665\" srcset=\"http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_16.jpg 1020w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_16-300x196.jpg 300w, http:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_16-768x501.jpg 768w\" sizes=\"auto, (max-width: 1020px) 100vw, 1020px\" \/><\/a><\/p>\n<p>\u0160to se ti\u010de spaljene plo\u010dice oko tranzistora 2N5551 to sigurno nije posljedica normalnog rada i zato ovo poja\u010dalo ne\u0107emo spajati na napajanje dok ne provjerimo ispravnost svih komponenti. \u00a0No ovdje treba stati i donijeti odluku. S jedne strane komponente poja\u010dala su dobro ozna\u010dene, poja\u010dalo je pregledne i jednostavne konstrukcije, uz sve to vjerojatno imamo jedan ispravan kanal pa bi poku\u0161aj popravka ovog poja\u010dala imao velike \u0161anse za uspjeh. S druge strane poja\u010dalo smo kupili zbog njegovog zanimljivog ku\u0107i\u0161ta u koje bi se lijepo moglo ugraditi neko umjetno antensko optere\u0107enje (la\u017ena antena) ili kakav drugi zgodni elektroni\u010dki sklop koji nije toliko ra\u0161iren i posvuda dostupan kao audio poja\u010dalo. Za sada \u0107emo odlu\u010diti ostaviti sve u ovakvom stanju, a ukoliko u nekom razumnom roku ipak ne uspijemo iskoristiti ovo ku\u0107i\u0161te mo\u017eda na kraju i popravimo ovo jo\u0161 jedno sasvim prosje\u010dno stereo poja\u010dalo u svojem (jo\u0161 jednom nagla\u0161avamo) pomalo neobi\u010dnom ku\u0107i\u0161tu \ud83d\ude42<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Danas je nabavljeno mini HiFi stereo poja\u010dalo Dynavox Spark II MK, proizvod njema\u010dke tvrtke Sintron Vertriebs GmbH iz 2010-tih godina. Njema\u010dka tvrtka \u00a0Sintron Vertriebs GmbH osnovana je 1994. godine i bavi se proizvodnjom i distribucijom velikog broja artikala iz podru\u010dja komercijalne elektronike za razli\u010dite brendove, me\u0111u kojima je i njema\u010dki Dynavox sa proizvodima iz podru\u010dja [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6575,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,65],"tags":[],"class_list":{"0":"post-6566","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-elektronika","8":"category-pojacala","9":"czr-hentry"},"jetpack_featured_media_url":"https:\/\/crowave.com\/blog\/wp-content\/uploads\/2019\/12\/dynavox_spark_2mk_09.jpg","_links":{"self":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/6566","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/comments?post=6566"}],"version-history":[{"count":3,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/6566\/revisions"}],"predecessor-version":[{"id":11055,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/posts\/6566\/revisions\/11055"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/media\/6575"}],"wp:attachment":[{"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/media?parent=6566"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/categories?post=6566"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.crowave.com\/blog\/wp-json\/wp\/v2\/tags?post=6566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}