@Lazar-Demin said in Arduino dock defect with power jack: In the meantime, our documentation site docs.onion.io has good pointers. ... For the PWM Expansion: https://docs.onion.io/omega2-docs/pwm-expansion.html#the-dc-barrel-jack-adapter About The DC Barrel Jack Adapter The DC voltage supplied through the barrel jack will be provided on the Vcc (and GND) pins. The PWM voltage will also be stepped up to this voltage. We’ve safely tested up to 12V, so try not to go beyond that or you risk damaging your Expansion. I haven't got any PWM Expansion but there's a very good photo in the official Onion Omega2 Documentation. Onion's PWM Expansion has an NXP PCA9685 16-channel, 12-bit PWM I2C-bus LED controller IC. According to the NXP Product data sheet Rev. 4 — 16 April 2015 Table 13. Limiting values VDD supply voltage max. +6.0V VID voltage on an input/output pin max 5.5V Please let me know what does this "We’ve safely tested ..." statement mean - personally for you and officially for Onion - exactly.