And Gate Using Npn Transistor. Here we will be using the transistor as a switch and so when a voltage is applied through a collector terminal of the npn transistor the voltage reaches the emitter junction only when the base junction is having a voltage supply between 0v and collector voltage. To build a logic and gate you are going to need the following parts.
We can find buffers not s and s or s nand s and nor s pre packaged in integrated circuits ic chips like those of the 74xx series. The example transistor xor gate circuit is implemented here using pn2222a npn transistors a variant of the 2n2222a but many common npn bipolar junction transistors could be substituted. Symbol of not gate bubble shows inversion a transistor name reflects the type of semiconductor it is made of and the number of terminals.
2x npn transistors i used the 2n2222 2x n o.
When input a is held high a small current passes through the base of transistor q22. 2x 10k ohm resistors. In the common emitter configuration transistor gives a phase shift of 180 degrees. A pair of npn transistors in series gives us an and gate.
