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 12vdc to 120vac		  New Topic  Reply to Topic
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shar
New Member

Philippines
1 Posts
Posted - Nov 03 2009 :  8:57:19 PM  Show Profile  Reply with Quote
how f the +polarity of thr cap i put it to the collector & the -polarity of is put it into the base of the transistor? pls. help audioguru!!!!!

Darkthero
Apprentice

USA
51 Posts
Posted - Nov 04 2009 :  03:33:27 AM  Show Profile  Reply with Quote
do u have a link to the schematic?
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Darkthero
Apprentice

USA
51 Posts
Posted - Nov 04 2009 :  05:38:23 AM  Show Profile  Reply with Quote
if this is the same circuit your talking about i made fixes for it. and yeah it dose with this way i built and tested it myself. http://img522.imageshack.us/img522/952/inverter.gif
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Aaron Cake
Administrator

Canada
6718 Posts
Posted - Nov 04 2009 :  10:50:17 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
If you are referring to the inverter schematic at http://www.aaroncake.net/circuits/inverter.asp, then don't bother. It doesn't work very well.

Instead, see the Inverter topic at the top of this Power Supply forum for circuits that actually do work.
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Nov 04 2009 :  3:40:25 PM  Show Profile  Reply with Quote
quote:
Originally posted by shar

how f the +polarity of thr cap i put it to the collector & the -polarity of is put it into the base of the transistor? pls. help audioguru!!!!!


The + of the capacitors should connect to the collectors of the transistors because the collectors swing to +23V.

But then the capacitors are charged to 23V and try to drive the base of the transistors down to -23V but the max allowed voltage for the emitter-base is only 7V so the transistors have avalanche breakdown which causes an extremely high current in the capacitors which causes them to explode even if their polarity is corrected.
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Darkthero
Apprentice

USA
51 Posts
Posted - Nov 04 2009 :  4:04:05 PM  Show Profile  Reply with Quote
i didn't notice those. but the way i have it now its putting out 130v and low amps and my caps havent exploded yet
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Aaron Cake
Administrator

Canada
6718 Posts
Posted - Nov 08 2009 :  11:15:39 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Yep, sometimes it works. I have several around here that work, and I even have a spare set of the mystical 68uF tantalum capacitors. Your success will depend on your transformer choice and the tolerance of your set of transistors. And using the proper fast recovery diode.

But the circuit still sucks.
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