Driver and coil sit on the same kind of substrate. The secondary is a spiral etched into copper-clad board instead of wound wire. The push-pull bridge started from one of Tefatronix's designs ("the power bridge design from one of Tefatronix's Tesla coil drivers"). The author then changed the feedback method and the gate drivers (paralleled UCC27424s, 8 A combined gate drive), and added music playback over a 3.5 mm jack through an LM358/LM393 class-D-style audio-to-PWM stage. Getting it running took some troubleshooting, all of it written up. Direct feedback alone was unstable. A first attempt to clamp it with a resistor dissipated about 10 W and the resistor exploded. A diode to strip the larger negative half-cycle fixed it. A separate startup fault shorted the supply when one MOSFET failed to switch, and a soft-start circuit fixed that. The final schematic was verified working on a prototyping board, with real photos and videos of it running in both continuous-wave and music modes. The matching PCB had not been fabricated and tested as of this write-up, so no complete-board Gerbers are published with the schematic. One trap for anyone building from the sheet. The gate drivers are drawn with IXDD604PI symbols, but the project’s own DigiKey BOM buys UCC27424P, pin-compatible 8-DIP dual low-side parts. The working prototype was built from the BOM.
Schematics and photos
full schematic: feedback, power bridge, music interrupter, switch (2023-07-06) 
power-bridge detail: drawn as IXDD604PI, BOM buys UCC27424P
Sources
- hackaday.io: Musical Tesla Coil Etched on a PCB
- hackaday.io: BOM.csv (DigiKey; confirms UCC27424P ×2, IRFP250NPBF ×2)
This is the card from the driver tree, written from what the builder published. Send corrections through the forum.