PCA9685 chip was wrapped in the middle of the small plate

power input terminals

green power light

in four groups of 3 pin connector convenient you an insert 16 servo motor, servo motor plug slightly wider than 0.1 “”, so you can put 4 to 0.1 “”joint)

input reverse polarity protection in a patch panel

cascade design

V + online placed a large capacitance (in some cases you will need) peripheral input voltage depends on the 10 largest v1000uf capacitance

all PWM output line put a 220 ohm resistor to protect them, and can be easily drive leds.