|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
|
|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
In Reply to: Probably in the works posted by DrM on March 4, 2003 at 11:49:12:
Maybe I'll call it that. Really, I don't know if I'll tackle this, but have been thinking about various approaches. Here's some pondering...First of all, it needs to have a non-intrusive frequency. I'm thinking 44.1kHz or double that for efficiency. Need to stay away from the 455kHz AM IF.
Output could be toroidal core with multiple secondary taps to handle push-pull amps (not just SE). Each tube would have it's own independent supply that to be biased anywhere you need. And more importantly, be synchronized in terms of switching RF noise. We certainly don't want any interference patterns (beat frequencies).
So maybe a fixed frequency PWM. This leads to problems in that the regulating loop response is in the audio band. That's one of the problems with dc servo turntables too. Maybe it can be done open loop, or have linear regulation on the input side of the converter. The good news is that soft-start will be easy to implement. Great for the tungsten.
Another idea is to use a Royer circuit. This can be tuned for a nice sinewave (much better than square waves) resonant output, just like the CCFL inverter in your laptop. I'm sort of leaning this way.
But hey, don't wait for me!
jh
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- UltraHeater - Jim Hagerman 03/4/0321:39:04 03/4/03 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2026, Audio Asylum, all rights reserved ]
