|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
75.161.13.132
In Reply to: Re: Ray, the whole point of using a choke input filter... posted by sorenj07 on May 6, 2007 at 10:13:44:
The formula is printed in the Radiotron Designer Handbook 4th edition, and depends on both the load presented to the power supply RL = voltage of power supply/current drawn by load, and the AC frequency. For a 50 Hz supply,L = RL/940
For a 60 Hz supply,
L = RL/1130.
These are approximate values to achieve continuous current flow according to the RDH. If I read the text correctly, this also suggests that below the critical inductance the current flow is not continuous during the whole cycle.
Follow Ups:
then too much should be just about right!I don't know what Jeff's doing or hearing, but it makes NO sense from any understanding I have - no more than his "crazy" grid stopper concepts.
And this isn't a critque of Jeff as such - I just wish his ideas came with some understanding.
Can't speak for Jeff, but he's expressed some, well, I would call it comtempt, for the RDH in some past posts. It seems his answer for any criticism is "just listen to it."
What Henry showed us, not Jeff, was that the right combo of small first choke (L1) and small first cap (C1) made it possible to charge C1's voltage to more than the normal max of 1.4 times the secondary RMS value. When a more "normal" LC stage followed it, regulation proved to be very good. Tuning is rather touchy (load dependent too). Personally I was troubled by the very high voltages developed in the first choke but Henry felt it was a limitation on Duncan's sim. I have not bothered to build it nor model anymore. Call me old school but I have no problem with a regular choke input filter.
| ||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: