A current limiting resistor, an LED, and optionally a switch to open and close the circuit.
Optionally a switch may be introduced to open and close the circuit. A current limiting resistor, and an LED.
A current limiting resistor, and an LED. Optionally a switch may be introduced to open and close the circuit.
A current limiting resistor, and an LED. Optionally a switch may be introduced to open and close the circuit.