The Diode – One Direction

Diodes are found in most electronic circuits especially when there are integrated circuits and microcontroller in the circuit. These diodes protect more sensitive electronic components from reverse polarity (users accidental connecting an electronic device with the power jack the wrong direction). They are also commonly used in Alternating Current (AC) circuits to rectify the signal. This process removes half of the wave form and can be used to convert AC signals to DC signals with a few diodes and capacitors.

Video:

Instructions:

Diagnosing problems:

  • If any component is getting hot disconnect the battery.
  • Ensure a resistor is used in the circuit or LED will be burned out and damaged
  • Ensure LED positive leg (longest) is connected to positive side of circuit
  • Check battery voltage with multimeter in Volts DC mode
  • Try a different LED in case it has been burned out (ensure you are using a resistor!)
  • Look at breadboard picture bellow and ensure all connection are correct.

Parts List

Part Qty Name
VCC1 1 4.5V – 6V Battery Supply
R1-3 1 330 Ohm Resistor
LED1 1 Red LED 5mm
D1 1 Diode 1N4001

Fritzing Breadboard Layout and Schematic Diagram:

Diode Circuit Breadboard

Diode Circuit Fritzing Schematic

 

Parts List:

Part Qty Name
VCC1 1 4.5V Battery Supply
R1 1 330 Ohm Resistor
LED1 1 Red LED 5mm
D1 1 Diode 1N4001

Teaching Points:

  • Ensure a resistor is used in the circuit or LED will be damaged
  • Ensure LED positive leg (longest) is conected to positive side of circuit
  • Use Multimeter to measure voltage across LED
  • Use Multimeter to measure current in through circuit

Quiz:

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