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In Reply to: RE: better way? posted by Stephen R on May 22, 2012 at 14:18:04
Interesting suggestion Stephan...basically you would add another pi filter stage?
For example, if the existing filter was already LCLC you would add another stage for the driver only? So the B+ to the driver would look like Rectifier>cLCLCRCL Driver Anode?
What would you suggest to hennfarm to use as a -3db rolloff point so he can determine a cap value?
robert
Follow Ups:
If there was room, funds or the parts lying about, I would use a separate supply for the driver but otherwise yes to your conclusion. But for some other people and other circuits, who knows, the series R and L might be fine. We all have prejudices and without trying out everyone's ideas, how can anyone say the have "the answer" and then only for that circuit or that person.I ended up with this exact situation in one of my phono stages but the choke loaded stage was the output. I've since rejigged it and the high value dropper is now a long tail in a DC coupled diff pair output.
Every circuit is different and without all the details of whole circuit, recommendations would be pointless which brings us all the way back to my original question ;) I tend not to calculate stuff but use LTSPICE as it can give a better overall picture.
cheers,
Stephen
Edits: 05/24/12
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