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Is there a relay that will work with 12V / 300ma input to close a Normally Open output? I've been trying to make it work with Ardouino board and a HiLetgo 12V 1 Channel Relay Module With Optocoupler Isolation Support High or Low Level Trigger, but have not been able to get it to work. Seems like there should be a simpler solution that doesn't involve a controller board.

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  • \$\begingroup\$ If you’d like alternatives please describe the logic level you are trying to interface with (3.3V? 5V?) and the type of signal you need. \$\endgroup\$
    – David
    May 30 '20 at 23:22
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    \$\begingroup\$ A small relay, or one of the common relay modules, should work - no need for an Arduino. Show a schematic of what you tried. \$\endgroup\$ May 30 '20 at 23:24
  • \$\begingroup\$ Ironically your problem may actually be that you have a module containing a relay and a driver circuit which may be "getting in the way". Your output seemingly has the capability to drive a small relay directly. \$\endgroup\$ May 30 '20 at 23:53
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Here's the end product - worked as expected enter image description here

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Just use a 12V relay - most small 12V relays will have 200 ohm or more coil resistance and thus use much less than 300mA to operate. - for 300mA coil resistance as low as 40 ohms would work.

Add a diode parralel to the relay coil to prevent back-emf problems.

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    \$\begingroup\$ Thank you. I found an SPDT micro relay with a coil rating of 12VDC -37.5mA -320 ohms. I think I will give that a try. \$\endgroup\$
    – chuck
    May 31 '20 at 3:06

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