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A transistor is a semiconductor device that can amplify signals and switch power. The types that are used most are BJT (Bipolar Junction Transistor), UJT (Unijunction Transistor), and MOSFET (FET, for Field Effect Transistor).

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Make NPN transistor ground when low, 5V when high [closed]

I need to use an NPN transistor to switch between no current and ground to control an SN74LS08N AND gate. I want a circuit to function as a switch, so that when the switch circuit is being powered, no …