Jakiś czas temu wspólnie ze znajomymi postanowiliśmy złożyć kolorofony. Założenia miały być następujące: niski koszt, dosyć prosta konstrukcja płytki, 4-kanały, możliwość zastosowania mocniejszych żarówek i generator przebiegu schodkowego. Po kilku minutach szperania w sieci padło na AVT2157.

Jako że zdobyliśmy instrukcje i schemat nie pozostało nic innego jak tylko wykonać projekt PCB. Do jego wykonania użyty został program DipTrace , który świetnie się sprawdził w swojej roli. Dla ciekawskich dodam jeszcze że po małej zabawie śmigał bardzo dobrze na WINE pod Debianem i OS X. Oczywiście wprowadziliśmy drobne zmiany na płytce w stosunku do oryginału AVT2157, jednak mowa tutaj przeważnie o kilku wartościach elementów elektronicznych. Dla zainteresowanych mogę poszperać i odszukać projekt PCB. Wybrałem 40W kolorowe żarówki firmy OSRAM - ze względu na koszty, jakieś 8 zł za sztukę. Wracając do kosztów, za podzespoły dla jednego kolorofonu wyszło jakieś 22 zł pomijając transformator. A oto efekt końcowy:

Mimo zastosowania żarówek o mocy 40W efekt jest bardzo zadowalający. Czasami w ramach relaksu miło jest złożyć jakiś ciekawy układzik. Za jakiś czas pora na coś ambitniejszego, dobry wzmacniacz akustyczny do kilku stówek - jakieś sugestie?

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To trafo, laminat, zwijkowe kondensatory i radzieckie rezystory (млт) wyglądają retro. A przy tym elektrolity z nacięciami... :D
Mam w książce schemat wzmacniacza o fajnych parametrach, z tego co pamietam 150W 4ohm (lub 100W 8ohm), pasmo przenoszenia 1Hz do 1MHz, i jakieś nikłe zniekształcenia. Te 150W/100W było podane ostrożnie, przy +/-50V tam były 4 pary tranzystorów po 40A każdy... Jak znajdę to podeślę :]

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Argon - będę wdzięczny jak podeślesz kiedyś na @.

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O ten nawet: http://www.elektroda.pl/rtvforum/topic589897.html

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