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16 way relay 5V1V24V optocoupler isolation high and low level triggering PLC control board multi-channel relay module

PWM pulse frequency duty cycle adjustable module square wave rectangular wave signal generator XY-PWM

PWM pulse frequency duty cycle adjustable module square wave rectangular wave signal generator XY-PWM

Modbus-Rtu7-24V 4-channel relay module switch input/output RS485/TTL anti reverse connection

Modbus-Rtu7-24V 4-channel relay module switch input/output RS485/TTL anti reverse connection

Modbus-Rtu7-24V 4-channel relay module switch input/output RS485/TTL anti reverse connection

30Wx2 high-power stereo digital amplifier board 12V/24V power supply DIY amplifier module DY-AP3015

TDA2822M amplifier board 2.0 stereo DC amplifier board portable miniature radio amplifier board

DC motor speed regulator 12V24V36V48V high-power drive module PWM controller 20A regulator

24V12V stepper motor drive simple speed regulation forward and reverse controller module PWM pulse signal generator

Volume potentiometer dual 50k adapter board with 300mm shielded wire DIY audio amplifier module accessories

XY-PWM square wave rectangular wave signal generator with adjustable PWM pulse frequency and duty cycle module with shell