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Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
So over the last few days I've been working daily getting a modulator built, low freq PWM, high freq PWM, external triggered pulse (with lockout), and audio modulation all in the same box. Tonight I've finally achieved the bench test of the whole thing. Videos are being uploaded atm and will be posted when they are done.
At about 30% power the thing draws about 1.5A, however in CW mode I don't have the space or balls to give it full voltage in my apartment so it will have to wait. Heatsinks get warm only after prolonged (20min cont.) usage
Edit: Videos! Eric Johnson - Cliffs of Dover Mix of songs TSO - Wizards in Winter Zelda Theme Music from Red Alert 2 Team Fortress 2 Theme Another mix of songs
Latest video: Daft Punk - Aerodynamic < Much better audio due to removing bass.
Modulator front, back, and panel design
Rats nest of wiring inside
Corona off the 24awg wire I used as a breakout point
Most importantly, the board is a plug-in conversion, no need to modify the existing SSTC5 whatsoever.
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Well, here is a note of warning to anyone out there that does audio modulation!
DO NOT USE LAPTOPS + Tesla coils!
Most laptops have a failing in that they are not connected to ground, they float above ground and thus have zero RFI shielding. I already had to use a ground loop isolation cable to get my laptop to connect without 60hz buzz, but since my body is a giant antenna, and the touchpad is capacitive (you can see where this is going), the trackpad stopped working and gave me a big scare as I restarted the laptop. Seems ok, but don't try this without alot of isolation between your expensive equipment and your TC!
My iPod seemed to work ok since it was grounded to the modulator, and had no interference.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Pretty funky, you did a good job making it. I take it from your description that the audio modulation is done with PWM of the bridge/ duty cycle modulation? Or are you PWMing the coil's power supply? I like the Zelda theme, it came out pretty good.
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
The audio signal is fed to a comparator (equivalent circuit), and the output is fed to the enable pins of the GDT drivers. So I suppose its PWM.
The initial videos were before the modulator was completely enclosed, so whenever the audio goes silent there is an audible 60hz hum in the background. With the modulator now completely enclosed the audio is clearer. I'll try to make time to take another video.
Registered Member #1658
Joined: Thu Aug 28 2008, 11:27AM
Location: Yungaburra Qld Australia
Posts: 8
I Would love to get the schematic from you to build this, i am building one soon but dont know how to audio mod it and still learing so if you could help in any way that would be so great!!
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Mini SSTC (SSTC5) Audio Conversion
