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Hi,
I've got this little transformer from my power suply 12Vdc 500mA,
I'd like to use it as converter 12V -->200V to charge up condensators 4700uF to approximately 200Vdc,
i"ve used ne555 to switch transistor with 8Hz to supply secondary winding with 8V and 2A, but max output in primary winding...
So. I replaced ZD1. Its strange, cause teacher in my school told that Zener Diode have only one vertical line with one horizontal, and Shottky one have something like S. But nevermind. As i said, today i'll buy new one and install it. One more time, Thank You for all that You have done to me,
@Relayer
Thank You... Thank You very much! We've DONE IT! i've checked voltage again. in dual op amplifier should be -12 and 12. there were only 12 and 0. so i was searching something suspect. Schottky Diode. it was strangly coneccted, so i delete it, plug in and there was -8V, subwoofer back to...
So. i've checked it, and all components are good. i also touched signal lines, and speakers 'shouted' and then i realize that this red and green paths are from speakers, not subwoofer, so then i touched 1 pin? leg? of tda2030 from subwoofer and subwoofer starts to 'shout', just doing sound...
voltage on tda are the same, 1 = 0V, 2 = 0V, 3=-12V, 4=0V and 5= -12V 2 Tda, this 3 pin is potentiometer on the back of sub to adjust his power, and 2 pin is subwoofer
There is no speaker/subwoofer mosfets, power suply is -12,0,12V, all of power transistors are connected to -12 and 12 V.
when i'm touching red wire which goes from middle pin in 3pin switch at middle of pic to potentiometer<adjusting of subwoofer power> subwoofer slightly scratching.
also...
Hi guys, i've got an Microlab FC330,
They just stop working. Aty first one MOSFET in power PCB didnt work properly so i take care of it.
Now subwoofer won't work, but speakers works well. my guess is a transistor c1858 <datasheet here...
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