Creating circuits diagram

General
1

Build a simple circuit using a battery diode resistor and led

2

Hi @caspillanrexy

Here’s a basic LED circuit using a battery, a diode, a resistor, and an LED:

Components:

  • 1 × Battery (e.g., 6V)
  • 1 × Resistor (e.g., 330Ω to 1kΩ)
  • 1 × LED (any color)
  • 1 × Diode (e.g., 1N4001)

How it works:

  • The resistor limits the current so the LED doesn’t burn out.
  • The diode protects the LED from reverse polarity by blocking reverse current.
  • When connected correctly (battery + to LED anode), the LED lights up.
  • If the battery is reversed, the diode blocks the current and the LED stays off protecting it.

Example: Battery Polarity Test Circuit

  • Green LED (Correct Polarity):

    • Turns on when the battery is connected with the correct polarity.
    • The current flows through two 1N5399 diodes and the green LED.
    • A 1kΩ resistor limits the current to protect the components.

positive polarity test
positive polarity test973×471 114 KB

  • Red LED (Reverse Polarity):

    • Lights up if the battery is connected in reverse.
    • The current takes an alternate path through two other diodes and the red LED.
    • The same 1kΩ resistor is used to limit current in both cases.

reverse polarity test
reverse polarity test943×470 111 KB

This setup gives you a simple way to test battery polarity with just a glance - green means correct, red means reversed.