westshot 89

master · Post by **master** » 03-02-2008, 12:16

Jesili pročitao ovo? ovo je sa stranice odakle je i shema:

A good starting point is using 4 turns for each primary (that is, 4 turns, centre tap and another 4 turns IN THE SAME DIRECTION). To calculate the number of turns of the secondary winding, multiply by the turns ratio. For example, if you want to build a +/-30V supply, the turns ratio is 30/13.8=2.2 approx, so wind 2.2 x 4 = 8.8 turns (better 9 turns, to overcome the diode losses) for each secondary (that is, again, 9 turns, centre tap and another 9 turns IN THE SAME DIRECTION)

e još nešto, probajovaj kalkulator:
http://schmidt-walter.eit.h-da.de/smps_e/smps_e.html

IGOMBAR · Post by **IGOMBAR** » 04-02-2008, 12:57

u pravu si trafo ne valja danas u školi sam probnom sondom i osciloskopom izmjerio signal on je potpuno pravokutan i ne poklapa se te okrenut za 180 stupnjeva

IGOMBAR · Post by **IGOMBAR** » 04-02-2008, 19:45

jel je u redu

http://www.elektronika.ba/forum/uploadz ... _slike.zip

IGOMBAR · Post by **IGOMBAR** » 08-02-2008, 00:07

zna li tko jeli signal dobar

master · Post by **master** » 08-02-2008, 11:26

Signal ti valja. kolika ti je frekvencija?

IGOMBAR · Post by **IGOMBAR** » 08-02-2008, 12:10

amplituda je 12 volti a ferkvencija nisam izmjerio kad na trafiju stavim 2x6 zavoja mosfeti u praznom hodu su hladni i ima malu snagu kad stavim 2x3 zamotaja mosfeti su 10 tak sekunda hladni te se postepeno zagrijavaju ali tad ima užasnu snagu jedino ako je trafo problem