Mega powered without load

Hi I have 20 solenoids connected to a mega2560, I put diodes from TIP120 collector to 12 volt power, if I disconnect the load the mega is still powered?, please advise thank you

Please post a schematic of your project

Hi its the same as the pic, but just with a mega and 20 solenoids

What is the source of power for the Uno?

That is no schematic.
See this tutorial to get started making schematics.

1 Like

The Mega is powered from its own power pins (barrel, Vin, USB, 5V pin, whatever you have chosen to use), not through your TIP120.

Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project :wink: See About the IDE 1.x category.

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.