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dre7 16th October 2007 08:41 PM

Deriving Secondary Voltages

I've been reading with great interest Mohan Varkey's reply to a post on this forum regarding the Powers PP6B4g design. I am facing a somewhat similar dilemma as I would like to drop the voltage to an input stage, but doing so requires a 10K resistor. Mohan remarked that this would slow transient response somewhat and suggested deriving secondary voltage from the center tap of the power supply. What I tried on my breadboard is a full wave bridge connected to both legs of the secondary, the remaining "+" side of the bridge to a choke input and center tap to a pi filter to the input stage. It works wonderfully, too much so in fact as it doubled my B+ voltage and put B++ where B+ had been.

My question is if there is any other method to derive a secondary voltage less than what I got? Transformer is 375-0-375 and I was hoping for a B+ around 350v and B++ no more than say 250v. If that's not possible is some other way around the big dropping resistor?



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