This build should control a 12 V solenoid. I made the changes that were suggested here.
Could you please look, if is correct? Thank you for your help.
That looks godd!
It looks good to me as well. You can use a 1N4001 diode if you want, The fly-back will be held to the forward drop of the diode.
Breadboards are not suitable for larger load currents.
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