Adopt NE5534 with gold-plated IC holder, you can freely replace other op amp ICs according to your preferences.
The resistor uses a metal resistor to ensure a good signal-to-noise ratio of the whole machine.
PCB adopts
6mm thick double-sided sheet, and tin-spraying process to ensure good passing performance of large and small currents.
This board wiring is reasonable, beautiful, the current sound is small. If you think other tone boards have large current and poor sound quality, then this is your best choice!