optocoupler 4n25

relay board relay module 12v Optocoupler Relay Module DC 5V 9V 12V Adjustable Timing Delay Time Timer Turn on off Relay Switch Module 6 Channel 12V Relay Board Module Optocoupler LED for Arduino 2ch relay board 5v opto isolator pc817 8 channel icm301 timer

arduino relay module timer relay 12v 220v motor relay board X2212P DC 5V 1 Channel Relay Module 30A supports high and low level trigger relay

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