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Hi there~
I get the relay model HE3621A0500 and I try to connect with transistor and ULN2003 without microcontroller to test it but it seem not working.
Can I know the right way of testing the reed relay and ULN2003?
According to your diagram, the two contacts to make the LED light up will never connect. You need to connect to the other pin on the switched side of the relay.
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