5v 8-channel relay module Relay board channel electronics input relays voltage arduino analog project projects purpose general simple switching lab application interface cmos ttl Relay channel module circuit diagram eight 5v board internal input same each has
5V 8-Channel Relay Module - Pinout, Features, Working, Applications
Relay channel 5v onboard regulator
Sainsmart relay board
8 channel relay board -use arduino for projects .
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