Not much changed from the standard RC Booster.
- All clipping diodes removed
- Bass tone capacitors C3 and C4 raised from 4n7 to 10n
- Minimum drive resistor R1 changed from 47k to 22k (less gain on the low end of the rotation)
- Input capacitor changed from 1uF to 100n (or raised from 47n to 100n, depending on which version of the RC you're comparing)
https://aionelectronics.com/blog/tracin ... c-booster/
Malacandra PCB here (can build any of the three variants) - updated to V2 based on traces:
https://aionelectronics.com/project/mal ... c-booster/