Not Gate Circuit Diagram Using Transistor. When the transistor is off no current flow through the collector emitter path. What you need a breadboard a bunch of 5k and 10k resistors and transistors a led you can use any npn type transistor for example 2n3904 bc547 bc548 bc549 etc these are basic circuits so they can be improved with diodes for reverse voltage protection for example or can be simplified xor xnor gates.
This is the circuit we are going to build on breadboard. Collector goes to ve terminal of battery through 1k resistor. When the button isn t pressed the input is low and the output is high which causes the led to light.
Such a circuit is straightforward to create using a single transistor and a pair of resistors.
The transistor diagram above will be used to demonstrate how a note gate works. Emitter goes to ground i e ve terminal of the battery. The not gate is the basic logic gate among all the gates. This project shows how to assemble a simple transistor not gate on a solderless breadboard.
