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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Alan wrote ...
wow :¬) It's very impressive, I'm glad I found you.
What is the frequency response like on it?
It sounds like one of these small ~5cm speakers but with "crispier" highs. If you listen closely there's nice bass response too, but it goes away as you stand further away.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Today i tried FM instead of pwm and i must say that the sound is a bit better or at least louder without distortions. The FM is realised by feeding the audio signal to the Rt pin of the pwm ic via a capacitor (4.7uF).
Video is here , but my camera has crappy microphone so you can't really hear the quality.
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
The idea is sound
I have repaired several of the units in the following link over the years These were tweeters that used a class C 27 MHz RF tube modulated by the audio
They sound amazing when running properly
An american company sold what they called an improvement for a while I forget their name but they used helium in the ion arc to get better sound pressure and longer life from the quartz assembly that supported the ionisation arc. The down side was you neede a helium cylinder in yourv lounge as well. In my opinion these tweeters when running properly were better than electrostatic units from Quad or accustat (inaccustat in my opinion)
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
I'm actually building your SG3525 circuit right now, with the schematic as given in the description for your "singing arc first prototype" video. Are you saying I can get better results "by feeding the audio signal to the Rt pin of the pwm ic via a capacitor (4.7uF)"?
Which pin is on the IC is Rt? I'm very interested in this.
EDIT: one more thing, will this work with a DC flyback?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Shaun wrote ...
I'm actually building your SG3525 circuit right now, with the schematic as given in the description for your "singing arc first prototype" video. Are you saying I can get better results "by feeding the audio signal to the Rt pin of the pwm ic via a capacitor (4.7uF)"?
Which pin is on the IC is Rt? I'm very interested in this.
Here is the freqeuncy modulated schematic (output stage not shown): I think it is best to use a half bridge output stage but single ended might work too.
Shaun wrote ...
EDIT: one more thing, will this work with a DC flyback?
Absolutely, this is with a DC flyback, FM driver and half bridge power stage.
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Plasma speaker/singing arc using a Flyback
, that is my video.
