Npn transistor question?
Im new at this stuff so im playing arround with transistors and im trying to replace a relay with a transistor, the relay that im trying to replace is a relay that stays on when there is no volts going to the gate and when the gate gets a 9v signal the relay shuts off is kind of backwards.is there a transistor that works this way ??
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If I were you, I'd stick with the relay. It is not the voltage that is going to be the problem or the action of the NPN transistor. The real problem is that a relay usually is constructed to trip on a low voltage and low current, but its switches are capable of handling quite a large current. In order for you to control that kind of current, you'd have to use something big like a 2N3055 which would have to be driven by a small transistor to control its (the 2N3055's) base. It's not worth the trouble in my mind.