Spehro Pefhany wrote:
>> Also, surprisingly (at least for me) TIP120 has a protection diode
>> built-in!
>
> No, it does not.

And even if it did, it would be in the wrong place to deal with the
inductive kickback current from the solenoid coil.  That has to go back to
the + supply, which the transistor is not connected to.


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