# Laboratory Report 1

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Republic of the Philippines BATANGAS STATE UNIVERSITY College of Engineering, Architecture, Fine Arts and Computing Sciences ECE/ICE/MexE Department ECE 354  –  Logic Circuits and Switching Theory Laboratory Report No. 1 Diode Logic and Transistor Inverter Submitted by: Biscocho, Christia Bess A. Dela Cruz, Mary Emergieline D. Ereño, Aileen M. Pinsan, Nelly A. ECE  –  3202 Submitted to: Engr. Ralph Gerard B. Sangalang January 17, 2013  INTRODUCTION The basic logic gates are the AND gate, OR gate, NAND gate, NOR gate and the NOT gate or inverter gate. For AND gate both input should be high to have an output of high voltage, if at least one input is low the output will be a low voltage, for an OR gate at least one input should be high for the circuit to give a high output, an inverting AND will have a low output if both the inputs A and B is high, as for inverting OR the output will be high only if both inputs have low voltage, lastly for NOT gate if the input is low the output is high and vice versa. Discrete components like resistors, diodes and transistors can be use to design a circuit with different functions that behave as that of basic logic gates. Diode-resistor logic can easily construct the non-inverting gates, but it is difficult to cascade this kind of circuit to achieve the other logic gates because multiple decrease in voltage will result due to voltage drops in every diode. Fortunately, other logic gates or the inverting gates can easily be constructed using DTL or Diode-Transistor Logic. OBJECTIVES   To construct the basic logic gates using discrete components   To have a review on how the components work   To determine how the circuits function MATERIALS   Breadboard   Connecting Wires   Diodes   Transistors   Resistors   Power supply   Led   Wire stripper  PROCEDURE 1. Construct the circuits shown below.  2. Test on how the circuits work by having an input A and B of 00, 01, 10 and 11 respectively. For the NOT circuit simply put 0 and 1 since it requires only one input at a time. 3. Tabulate a truth table for each circuit. RESULTS OR FINDINGS  AND Gate A B O 0 0 0 0 1 0 1 0 0 1 1 1 NAND Gate A B O 0 0 1 0 1 1 1 0 1 1 1 0 OR Gate A B O 0 0 0 0 1 1 1 0 1 1 1 1 NOR Gate A B O 0 0 1 0 1 0 1 0 0 1 1 0 NOT Gate A O 0 1 1 0 Table 1. AND and OR Truth Table Table 2. NAND and NOR Truth Table 3. NOT Truth Table

Jul 23, 2017

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Jul 23, 2017
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