NOR Gate using Diode and Transistor (DTL) This is a very simple NOR gate circuit construction using a pair of diodes and a transistor. The implementation is on a solderless breadboard using discrete components. This diagram shows how to make a simple DTL circuit that has the same function as a NOR gate. The design is very similar to the transistor gates shown in this multi-part article. TTL NAND - Falstad This is an NAND gate implemented using transistor-transistor logic. Click on the inputs on the left to toggle their state. When all of the inputs are high, the output is low; otherwise, the output is high. When both inputs are high, the two transistors on the left are in reverse active state. Write Short notes on 2 input TTL NAND gate The circuit diagram of a 2 input TTL NAND gate is as follows: A two input TTL NAND is shown above. A and B are two inputs while Y is the output. Operation of the gate: a) A and B both low: both B-E junctions of Q1 are forward biased. Hence D1 and D2 will conduct to force the voltage at point C to 0. NAND Gate Circuit Diagram and Working Explanation Aug 25, 2015In this NAND gate circuit diagram we are going to pull down both input of a gate to ground through a 1KΩ resistor. And then the inputs are connected to power through a button. So when the button is pressed the corresponding pin of gate goes high. So with two buttons we can realize the truth table of NAND gate.[PDF] Chapter 5 DIODE TRANSISTOR LOGIC DIODE TRANSISTOR LOGIC CIRCUITS A typical DTL NAND gate is shown in Figure 3. Observe the diode AND function on the front end and the transistor NOT at the output end. The extra resistors and diodes are used to maintain appropriate currents, to maintain proper functioning, and to guarantee certain noise margins.