This PIC microcontroller based RC driver is able to control 4 RC Servo by on board
Understanding Radio Control Gear
4-CHANNEL-RC-SERVO-CONTROLLER-BOARD-001
4 Channel RC Servo Controller Board
Hobby Servo Tutorial - SparkFun Learn
4 Channel Servo Extension via CAT6 - goBILDA
Navigator Flight Controller for Raspberry Pi 4 for ROVs, robots, and drones
This compact four-channel multiplexer of hobby radio control (RC) pulses allows for easy switching between two independent signal sources. An
Pololu 4-Channel RC Servo Multiplexer (Assembled)
Mini Maestro 12-Channel USB Servo Controller (Assembled)
4-channel rc servo controller - RobotDigg
LSC-6: Hiwonder 6 CH Bluetooth 4.0 Servo Controller Module RC Robot To
4-CHANNEL-RC-SERVO-CONTROLLER-BOARD-pcb-SILK