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Transformer or Full wave bridge which draws more current    
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John1397



Joined: 16 Aug 2007
Posts: 44
PostPosted: Wed Sep 16, 2009 8:44 pm    Post subject: Transformer or Full wave bridge which draws more current Reply with quote
What draws more current a small transformer like from a cell phone charger wich puts out dc or ac going thru .22 mfd by 250 volt capacitor to a full wave bridge assuming no load on either and both inputs connected to 120 volt ?

John
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JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
PostPosted: Thu Sep 17, 2009 10:48 am    Post subject: Reply with quote
Any particular time of day or day of the week? Wink
kuhurdler



Joined: 28 Dec 2006
Posts: 2879
Location: Overland Park, KS
PostPosted: Thu Sep 17, 2009 11:50 am    Post subject: Reply with quote
not enough information.
John1397



Joined: 16 Aug 2007
Posts: 44
PostPosted: Sat Oct 03, 2009 6:35 pm    Post subject: I think I got it Reply with quote
I built it on a test board and 120 volt ac going thru .22 mfd X 400 volt capacitor going to full wave bridge appears not to draw any current with no load as a small transformer draws current with no load. All I am trying to power is a led on 120 volt ac. I did add a 5000 ohm resistor to cut down current in case lightning hits the line it might help protect diode, just doesn't burn as bright with resistor as without.

John
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