The NPN transistor in bottom left with grounded base is turning on in circuit simulator for some reason.

Can someone tell me why is this happening?

Circuit Simulation link

circuit schematic

I know why the other 3 transistors are turning on. I am not using this circuit instead this one h bridge


1 Answer 1


Initially it looked like the simulator was showing the current flowing in the wrong direction. I removed your voltage source and ground, then added new ones and it worked correctly, the transistor was not turned on like in the simulation you posted. However, when I exported a link it started to behaved incorrectly as yours did.

Looks like it is a bug in the simulator.


  • \$\begingroup\$ Well no current flow is not in wrong direction just decrease the simulation speed to make it fluent then it will not appear to be moving in wrong direction, I am not accepting the answer as I will check the circuit in other simulators to check if it was a bug when I get back my laptop next month \$\endgroup\$ Commented Mar 14, 2021 at 3:04

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