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In Reply to: RE: Flywheels and Low DCR posted by deathtube 667 on October 12, 2016 at 08:24:34
Hi,
The example that Triode Kingdom posted above, of a LSES or even a flywheel supply, was TOTAL TRASH. He picked values we NEVER use, maybe so he could " prove a point". But all it proved is personal intellectual dishonesty.
I just listened to a 2016 pair of DF amps, on GPA 604s in a MLTL, for three days solid at RMAF, and the amps had no low frequency " resonances " but rather, a GLORIOUS low end.
Also, you show a 3 HY 80 Ohm choke, and not a 3 HY 30 Ohm chokes as TK simulated. 80 Ohms of DCR in a choke positively sucks.
The very FIRST THING Mr. Fulton ever told me about amp design, ( for 2A3s in this case - 1982 ) was, that the chokes have to be 20 Ohms or less. Nothing has changed. Today, I use 10 Ohms or less, and this past weekend in Denver - RMAF, I was listening to LSES with 4 ohm Ls. Was glorious .
Your use of C2 and C3 at 50 uF is arbitrary, not well thought out, and I have showed you better C2 and C3 values, smoother settling. Maybe we need to discuss this privately some !! I suggest that.
Jeff Medwin
Follow Ups:
drlowmu,
I'll review your PSUD2 graphs and get back to you off forum.
My flywheel filter is about what I could build with the parts I have on hand.
Have a good day,
dt 667
IIRC, you said that was your day job. Do you work in a factory or at a distributor? And I'll bet those light bulbs today are LED or compact fluorescent?Now if at a factory, why not discuss your power supply design with some of your engineers at lunch? After all, an LED or CF lamp contains a switch mode power supply. That is an LC filter on the output.
All the math and theory to design an LED or CF power supply can be re-applied to a linear audio amp supply. And as SMPS design is far more complicated than brute force linear supplies, I'm sure your engineers have lots of superior knowledge on power supply inductor theory.
If I wanted to know more about choke input power supplies, an SMPS design engineer is probably the best source of knowledge you will find today.
Edits: 10/12/16 10/12/16
I'm working in an R&D lab with mechanical and chemical engineers for the last 3 years.
Mostly setting up and running life tests on various products made of composite plastics, rubber compounds and metals. Then I document test results and send data sets to the engineers for analysis.
The company outsources electrical engineering work to Germany.
One of the engineers and the other guys in the lab know I do the tube hobby, but they are clueless to help me out.
Except for the help I get from the forum or online, I am on my own to learn anything new.
Not always such an easy task.
z
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