[sdiy] transformer question

[Sowa Roman]

just a thought:

wouldn't be usefull a circuit where transformer is powered up via, say, 1k
resistors in series with primary windings, and with the load disconnected on
secondary side, so only rectifier and capacitors are connected. When
capacitors get charged to full working voltage, a relay shorts those 1k
resistors and connects the load to the power supply.
Have anybody tried this?

Roman

""-----Original Message-----
""From: jhaible at t-online.de [mailto:jhaible at t-online.de]
""Sent: Thursday, January 03, 2002 3:26 PM
""To: Czech Martin
""Cc: diy (E-Mail)
""Subject: Re: [sdiy] transformer question
""
(..snip..)
""under load: A transformer which has a higher DC resistance
""in its winding has its rated voltage *under nominal load*
""(and it will goo higher without load). If you add an external
""resistor, the voltage under load will be smaller than the rated
""voltage of the transformer, of course.
""
""So the solution is: Select a toroidal with slightly higher
""secondary voltage, and use external resistors to fit your needs.
""There are also special rectifiers with considerable resistance,
""but I've never used them. I think Harry can tell us about these.
""
""JH.
""


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