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Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Hi people, I know that audio-modulation of fly-back is topic which comes back again and again. I tried myself recently after seeing Richrads miracle. Well my attempt is far from that quality, but at least the music is not such a crap …
Here are my questions and considerations which I’d like to discuss further.
1) The design of the electrodes is incredibly important for the sound quality; to keep the plasma to be only between the tips of the electrodes is big challenge. How the hell Richard you did it? What material you used? 2) Most of the DC fly-back has a cap internally connected to the HV output so it destroys the continuous plasma in lower energies; in higher energies it burns the electrodes. It raises the question, where to get fly-back which is without this stupid internal cap, or how to disconnect or maybe destroy this cap? 3) AC fly-back has generally better sound performance, however it’s not easy to get them anymore… 4) In case somebody would like to claim again that he can run his fly-back at 100 KHz must send me a picture of connected oscilloscope if he wants me to believe that. All my fly-backs (and I tested 10pcs form different TV’s and monitors including one AC) are not running far more than 30 KHz. Am I so unlucky to get the right one, or somebody is not saying true on the forum? 5) The sound produced by all the tested fly-backs is a very poor quality. It is distorted, energetically inefficient and unstable. I would never use my fly-back based tweeter as a substitution of my Hi-fi. On the other hand it was fun to play with…
Technical details of my setup: PWM modulated TL494. Power part: single IRFPC60 with TVS and Mur860. Parallel cap with the fly-back is 100nf/1.6KV. DC supply is 50V
Registered Member #1370
Joined: Mon Mar 03 2008, 09:01AM
Location: Finland
Posts: 56
1) Try various shapes. I think for the very first test you could use filed nails. If you have tungsten, try it also. 2) Get old flyback from old TV. Some devices don't have integrated cascade. 3) Yes... I found two of them when I was coming to home. 4) I ran my old AC-flyback at few hundreds of kilohertz one day and it worked fine. (square wave, 30V primary, 6 turns) 5) It's quite hard to get hi-fi from flyback...
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Nice. I think I'll tell you the secret, my biggest discovery in audio-mod flybacks: Use Frequency modulation not Pulse width modulation! It was a change to better quality and mainly more volume. And yes, in this mode you need to operate fairly high frequency, 50-100kHz is a good start. Just use less turns on the flyback to get the desired output.
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audio-modulated fly-back
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