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I am working on this small project getting a relay to turn on/off the amp. when it gets a 12 V trigger from a netstreamer.

The relay is powered from 5 V USB 230 V adapter.

Question: should I connect the ground, -12 V, to the same ground as the 5 V power supplier?

EDIT https://www.electrokit.com/uploads/productfile/41015/41015704_-_5V_Relay_Module.pdf

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  • \$\begingroup\$ Please provide a link to the manufacturer's datasheet for the relay. \$\endgroup\$ Feb 24, 2020 at 15:10
  • \$\begingroup\$ @jsotola diagram updated. \$\endgroup\$
    – Toko
    Feb 25, 2020 at 7:49

2 Answers 2

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Generally yes - otherwise, no closed circuit is created which could trigger your relay.

Make sure your relay module supports a 12V signal though, and always take the necessary precautions when working with high voltages.

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Unless there is an (optical) isolator somewhere in the relay circuit, the 5V and 12V parts should share the same ground. But you should make sure the relay circuit can handle the +12V input signal.

It would help if you could tell us what relay module you're using and what the trigger source is.

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  • \$\begingroup\$ See edit post. The Trigger source is a network streamer that has a 12v mono jack out to turn the amplifier on when the streamer is turned on, but in my case the amp. does not have a trigger in . \$\endgroup\$
    – Toko
    Feb 24, 2020 at 16:53
  • \$\begingroup\$ Why would an opto isolator make a difference? \$\endgroup\$ Jul 24, 2022 at 12:31
  • \$\begingroup\$ Optical isolators allow you to transfer signals from one circuit to another without the need for a common ground. \$\endgroup\$
    – StarCat
    Jul 24, 2022 at 13:05

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