I'm a mechanical engineer not electrical so please excuse my ignorance. I am trying to get a circuit working which seems pretty simple. It is effectively a level switch, so if the probes are in water the bulb is out, if there is no water the bulb is on.
If I substitute the bulb with an LED and 680 resitor the circuit works fine, but if I put a bulb in it does not light.
The bulb current accross 12v is 23mA and the tramsistors in the darlington pair can handle 1A.
I thought I could simulate it in LTspice, but Ive failed again, I can draw the circuit but the simulation doesn't run.
Any alteration suggestions greatfully received.
If I substitute the bulb with an LED and 680 resitor the circuit works fine, but if I put a bulb in it does not light.
The bulb current accross 12v is 23mA and the tramsistors in the darlington pair can handle 1A.
I thought I could simulate it in LTspice, but Ive failed again, I can draw the circuit but the simulation doesn't run.
Any alteration suggestions greatfully received.
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