Diode Transistor Logic Diagram. An or gate immediately followed by a not gate constitutes the or not or nor gate. Figure 3 a gives the circuit symbol and boolean expression for nor gate while figure 1 b gives the two input truth table.
The extra resistors and diodes are used to maintain appropriate currents to maintain proper functioning and to guarantee certain noise margins. Nor diode transistor logic dtl gate. The following figure shows the circuit for the 2 input dtl nand gate.
Observe the diode and function on the front end and the transistor not at the output end.
The input is connected through a pair of diodes in series with the base of the transistor. It consists of two diodes and a transistor. Logic circuit of 2 input dtl nand gate. The diode connected directly to the transistor base serves to raise the input voltage required to turn the transistor on to about 1 3 to 1 4 volts.
