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In Reply to: The Need To Bleed...........and conversion voltages posted by drlowmu on March 9, 2007 at 23:09:22:
The intended function of a bleeder resistor is to discharge capacitors after the equipment is turned off. Good caps can hold their charge for a LONG time. So bleeder resistors are a saftey requirement, and not really an option. The secondary function, in a 'L' first supply, is to sink the minimum amount of current necessary to reach 'critical current'. But this isn't an issue in your low L designs, since 'critical current', is never reached.By the way. I have a hard time believeing that a resitor of a value in the K ohms, shunted by a cap of at least 10 uFd, has any 'sound' at all. It's impedance, relative to that of the caps, is so high as to be insignificant.
Follow Ups:
leads to non-imaginative thinking and problem solving.
What exactly is 'bad EE trainig'? What is 'good EE traing'? And what does too little EE training lead to?
Strictly IMHO !!!1) Bad EE training is training of too narrow a focus, such that one cannot get past rigid theories and think out of the box.
2) Good EE training allows you to think and successfully tackle a variety of engineering problems, not just electrical.
3) Too little EE training frees-up ones mind so they will try different posibilities and find out what works best, with no preconceived notions as to " how it should be according to theory ", to a point where good approches and effective practices are not even persued.
1) I'd feel sorry for myself, having 6 years of college EE training, except that my employers over the last 30 years do not share your view. Well, O.K., it's really only 5 years of EE education - the first year was all humanities.2) Personally, I'd rather be seeing a formally trained doctor with lots of education than one only learns by blind experimentation.
I was not ever trained in EE. I have no limits to my thinking and I am prepared to try anything, not knowing why it may not work. You can say I know no better.
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