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Subject:	Re: voltage dropping and current limitting
Newsgroups:	lugnet.robotics.handyboard
Date:	Fri, 29 Jan 1999 16:27:31 GMT
Original-From:	bmajik5127@aolANTISPAM.com
Viewed:	924 times

I have a transformer, when powered by 110 vac I get 16 vac out. I put it through a bridge rectifier and the problem is when I put a cap say 20v 1000uf across the + - of the rectifier, the voltage jumps to about 20 vdc. If I omit the cap and attach a small dc motor I get the same effect. WHY??? Any info would be much appreciated. -Mike

Message has 2 Replies:

		Re: voltage dropping and current limitting
(...) Well, just off the top of my head, when you say "get 16 vac out" how are you determining this, a volt meter set for "Volts AC" or some such? Not, say, an oscilloscope? You will note that almost all meters render "AC Voltage" as the RMS (Root (...) (26 years ago, 30-Jan-99, to lugnet.robotics.handyboard)

		Re: voltage dropping and current limitting
Dear Mike, I believe the 16 V is rms value. If you attach a capacitor across the bridge rectifier under no load condition(output terminals are open), the capacitor gets charged not to 16 V rms but to the maximum value ie Vm=16*2^0.5 which is about (...) (26 years ago, 30-Jan-99, to lugnet.robotics.handyboard)

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