Audio Modulated VTTC
Jorrit, Tue Jul 31 2007, 12:38PMGood day coilers
I wanted to audio modulate my vttc but I didn't like the original way it was done.
So I came up with a new circuit I think.
Basicly the coil is running CW from 2 mots full wave rectified.
I have put a IGBT between the cathode of the tube and the ground.
This IGBT is switching a PWM signal with a frequency of about 80 Khz. This signal is modulated with audio. The coils resonant frequency is about 240 kHz so the PWM frequency ain't to close.
I will draw a schematic of it if people are interested.
Next will be a vttc running at 1.5 MHz and a modulation frequency of 200 kHz. Hope this will improve the sound quality even more.
Movie:
]1185884798_140_FT0_amvttc.wmv[/file]
Link to youtube
Re: Audio Modulated VTTC
GreySoul, Tue Jul 31 2007, 01:28PM
Kinda looked like the wire loop was head banging to the music.
neat.
And look out for that ozone - it can be quite toxic in high concentrations.
GreySoul, Tue Jul 31 2007, 01:28PM
Kinda looked like the wire loop was head banging to the music.
neat.
And look out for that ozone - it can be quite toxic in high concentrations.
Re: Audio Modulated VTTC
WaveRider, Tue Jul 31 2007, 04:17PM
Well done!
If you have a schematic, that would be nice. I am interested to see how your circuit works..
Cheers!
WaveRider, Tue Jul 31 2007, 04:17PM
Well done!
If you have a schematic, that would be nice. I am interested to see how your circuit works..
Cheers!
Re: Audio Modulated VTTC
Jorrit, Tue Jul 31 2007, 08:30PM
Thanks for the replies. I will write the schematic tommorow and post it here
Today I transfered it from bread board stage to pcb. Now busy building everything into the base of the coil.
I hope I can find enough wire to wind another seconday so I can change the frequency from 240 kHz to 1.5 MHz.
This wil hopefully increase sound quality even more.
Jorrit, Tue Jul 31 2007, 08:30PM
Thanks for the replies. I will write the schematic tommorow and post it here
Today I transfered it from bread board stage to pcb. Now busy building everything into the base of the coil.
I hope I can find enough wire to wind another seconday so I can change the frequency from 240 kHz to 1.5 MHz.
This wil hopefully increase sound quality even more.
Re: Audio Modulated VTTC
GimpyJoe, Tue Jul 31 2007, 11:04PM
"It smells like..... victory."
If you haven't grown too attached to that secondary you could just cut it down and try a higher frequency.
GimpyJoe, Tue Jul 31 2007, 11:04PM
"It smells like..... victory."
If you haven't grown too attached to that secondary you could just cut it down and try a higher frequency.
Re: Audio Modulated VTTC
Jorrit, Thu Aug 02 2007, 04:25PM
I don't think i`m going to cut the secondary down. This won't raise the frequency enough I think.
Does anybody now around wich frequency the spark becomes silent ?
I haven't drawn the schematic yet because i`m adjusting some minor things so it can be adjusted to suit more coils.
I think I will have it done this weekend.
Jorrit, Thu Aug 02 2007, 04:25PM
I don't think i`m going to cut the secondary down. This won't raise the frequency enough I think.
Does anybody now around wich frequency the spark becomes silent ?
I haven't drawn the schematic yet because i`m adjusting some minor things so it can be adjusted to suit more coils.
I think I will have it done this weekend.
Re: Audio Modulated VTTC
Dalus, Thu Aug 02 2007, 04:49PM
I had a small sstc running at 1.4 Mhz and that was totally silent and my 300Khz sstc had a little hiss. Nice job on the coil, what's the volume like.
Dalus, Thu Aug 02 2007, 04:49PM
I had a small sstc running at 1.4 Mhz and that was totally silent and my 300Khz sstc had a little hiss. Nice job on the coil, what's the volume like.
Re: Audio Modulated VTTC
Marko, Thu Aug 02 2007, 05:39PM
Hi jorrit
If you hear buzz your filtering is much more likely problem.
I imagine you need lots of capacitance to get smoothy DC at this voltage. How much are you using?
Marko, Thu Aug 02 2007, 05:39PM
Hi jorrit
If you hear buzz your filtering is much more likely problem.
I imagine you need lots of capacitance to get smoothy DC at this voltage. How much are you using?
Re: Audio Modulated VTTC
Jorrit, Thu Aug 02 2007, 05:40PM
It's pretty loud. When my friend says that the breakout loop is turning (dutch) i say: true dolby surround but you can hardly hear me. You can hear him pretty good because he has the camera
I`m looking for some materials to construct a coil with a Fres over 1 MHz. I want it to have thick wire because this coil is heating up at full power CW. I also want it to have about the same size as this coil. So I hope I have the wire and materials I need
Edit:
Well it's more like a hiss. You can hear it humming a bit but not very loud. I had a 166 uF 7.5 KV capicator but I gave it to a fellow coiler who had more power available as me so he could make better use of it. Now i'm using 4 mot caps parral so it's only 4 uF. I`m looking for some new caps for some more smoothing capacity.
Jorrit, Thu Aug 02 2007, 05:40PM
It's pretty loud. When my friend says that the breakout loop is turning (dutch) i say: true dolby surround but you can hardly hear me. You can hear him pretty good because he has the camera
I`m looking for some materials to construct a coil with a Fres over 1 MHz. I want it to have thick wire because this coil is heating up at full power CW. I also want it to have about the same size as this coil. So I hope I have the wire and materials I need
Edit:
Well it's more like a hiss. You can hear it humming a bit but not very loud. I had a 166 uF 7.5 KV capicator but I gave it to a fellow coiler who had more power available as me so he could make better use of it. Now i'm using 4 mot caps parral so it's only 4 uF. I`m looking for some new caps for some more smoothing capacity.
Re: Audio Modulated VTTC
Jorrit, Sat Aug 04 2007, 05:44PM
Here is the schematic.
It ain't finished yet but I didn't have much time today to draw it.
But I think most of the people here will understand it.
I explained it a little bit in the schematic. I will improve this when I got some more time.
Jorrit, Sat Aug 04 2007, 05:44PM
Here is the schematic.
It ain't finished yet but I didn't have much time today to draw it.
But I think most of the people here will understand it.
I explained it a little bit in the schematic. I will improve this when I got some more time.
Re: Audio Modulated VTTC
Dalus, Tue Aug 07 2007, 01:46PM
Maybe you should use a faraday cage, I found myself broadcasting on the AM band @ 261 Khz with my audiomodulated sstc.
Dalus, Tue Aug 07 2007, 01:46PM
Maybe you should use a faraday cage, I found myself broadcasting on the AM band @ 261 Khz with my audiomodulated sstc.
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