Arduino switching negative supply

Thread Starter

john4444

Joined Dec 13, 2016
2
Any suggestions on how to switch a negative 12V 3A supply with an Arduino? Low cost so preferably not a relay! Thanks.
 

ronsimpson

Joined Oct 7, 2019
2,011
+5V is the supply for the computer.
-12V is the supply for the load.
R1 is the load.
"in" goes to a IO pin on the computer.
Then "in" is not connected or below 0.5V, Q2 is off.
When "in" is at 3 to 5V, Q1 and Q2 are on.
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