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Registered Member #140
Joined: Sat Feb 11 2006, 11:43AM
Location: The Netherlands
Posts: 14
Good 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.
Registered Member #140
Joined: Sat Feb 11 2006, 11:43AM
Location: The Netherlands
Posts: 14
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.
Registered Member #140
Joined: Sat Feb 11 2006, 11:43AM
Location: The Netherlands
Posts: 14
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.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
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?
Registered Member #140
Joined: Sat Feb 11 2006, 11:43AM
Location: The Netherlands
Posts: 14
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.
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Audio Modulated VTTC
