Circuit Documentation

Summary

This circuit consists of a DC power source, multiple resistors, red LEDs, a 7-segment display, 74HC21 logic gates, and DIP switches. The circuit is designed to control the LEDs and the 7-segment display using the 74HC21 logic gates and DIP switches.

Component List

DC Power Source

• Description: Provides the necessary voltage and current to power the circuit.
• Pins: Ground, Positive

Resistor

• Description: Limits the current flowing through the circuit.
• Pins: pin1, pin2
• Properties:
  • Resistance: 1000 Ohms

LED: Two Pin (red)

• Description: Emits light when current flows through it.
• Pins: cathode, anode

7-segment Display

• Description: Displays numerical digits using seven individual segments.
• Pins: A, B, C, D, E, F, G, COM, dot

74HC21

• Description: Dual 4-input AND gate.
• Pins: A1, B1, NC, C1, D1, Y1, GND, VCC, D2, C2, B2, A2, Y2

DIP Switch 4 Position

• Description: Provides a way to manually set binary inputs.
• Pins: 1, 2, 3, 4, 5, 6, 7, 8

Wiring Details

DC Power Source

• Ground: Connected to:
  • 74HC21 (A1)
  • Resistor (pin2)
• Positive: Connected to:
  • LED (anode)
  • 7-segment Display (COM)
  • 74HC21 (VCC)

Resistor

• Resistor 1:

  • pin1: Connected to LED (cathode)
  • pin2: Connected to 74HC21 (C1)

• Resistor 2:

  • pin1: Connected to LED (cathode)
  • pin2: Connected to 74HC21 (D1)

• Resistor 3:

  • pin1: Connected to LED (cathode)
  • pin2: Connected to 74HC21 (Y1)

• Resistor 4:

  • pin1: Connected to LED (cathode)
  • pin2: Connected to 74HC21 (GND)

• Resistor 5:

  • pin1: Connected to 74HC21 (Y2)
  • pin2: Connected to DIP Switch (4)

• Resistor 6:

  • pin1: Connected to 74HC21 (C2)
  • pin2: Connected to DIP Switch (4)

• Resistor 7:

  • pin1: Connected to 74HC21 (NC)
  • pin2: Connected to DIP Switch (3)

• Resistor 8:

  • pin1: Connected to 74HC21 (B2)
  • pin2: Connected to DIP Switch (2)

• Resistor 9:

  • pin1: Connected to 74HC21 (A2)
  • pin2: Connected to DIP Switch (1)

LED: Two Pin (red)

• LED 1:

  • cathode: Connected to Resistor (pin1)
  • anode: Connected to DC Power Source (Positive)

• LED 2:

  • cathode: Connected to Resistor (pin1)
  • anode: Connected to DC Power Source (Positive)

• LED 3:

  • cathode: Connected to Resistor (pin1)
  • anode: Connected to DC Power Source (Positive)

• LED 4:

  • cathode: Connected to Resistor (pin1)
  • anode: Connected to DC Power Source (Positive)

7-segment Display

• A: Connected to 74HC21 (C1)
• B: Connected to 74HC21 (D1)
• C: Connected to 74HC21 (B1)
• D: Connected to 74HC21 (A1)
• E: Connected to 74HC21 (GND)
• F: Connected to 74HC21 (NC)
• G: Connected to 74HC21 (B1)
• COM: Connected to DC Power Source (Positive)
• dot: Connected to 74HC21 (NC)

74HC21

• A1: Connected to DC Power Source (Ground)
• B1: Connected to 7-segment Display (C)
• C1: Connected to Resistor (pin2)
• D1: Connected to Resistor (pin2)
• Y1: Connected to Resistor (pin2)
• GND: Connected to Resistor (pin2)
• VCC: Connected to DC Power Source (Positive)
• D2: Not connected
• C2: Connected to Resistor (pin1)
• B2: Connected to Resistor (pin1)
• A2: Connected to Resistor (pin1)
• Y2: Connected to Resistor (pin1)

DIP Switch 4 Position

• 1: Connected to Resistor (pin1)
• 2: Connected to Resistor (pin1)
• 3: Connected to Resistor (pin1)
• 4: Connected to Resistor (pin1)
• 5: Not connected
• 6: Not connected
• 7: Not connected
• 8: Not connected

Code

No code is provided for this circuit.