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Registered Member #1488
Joined: Sat May 17 2008, 10:41AM
Location: Germany
Posts: 18
Hi, I used two free weekends to build a "quick and dirty" Class E Tesla coil with audio modulation. The idea came from my young nephew, who wanted to see something like this in action (well, he didn't care if it was class E or not, he just wanted to see sparks and sound). After I had reread Richies page about his 4Mhz coil again and had a theoretical insight into the operation, i started with the construction. Since it was just a prototype, I didn't bother to draw a schematic, I'm sorry for that. I think it's simple enough and nothing new under the sun anyway.
The audio modulation is realized by a Class D amplifier consisting of a synchronous buck converter, whose heart is a tl494 PWM IC. It is a rather simple design but works surprisingly well and stable. The annoying hissing is generated by some kind of feedback from the high voltage to the signal generator.
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