Nand Gate Circuit Diagram Using Diode. So the transistor is on and the output voltage at the collector is 0v because of the dropped voltage with the ground. Output indicator i e led is connected.
For simplicity we will show here only two inputs nand gate circuit by using diodes and transistors this nand gate is called dtl nand gate or diode transistor logical nand gate. All gates using. Just connect another not using nand to the output of an or using nand.
The diodes could be any general purpose 1n4148 type.
Thus the diode anode the output will be logic 0. This method works fine when the circuits are simple but there are problems when you have to make interconnections with such gates. The nand gate may be easily implemented by putting a transistor logic not gate immediately at the output of a diode and gate. Here we have discussed diode transistor nand gate or dtl nand gate with its details circuit diagram.
