Yhteiskatodikytkentää

Yhteiskatodikytkentää, known in English as common cathode connection, is a wiring configuration used primarily with LEDs. In this setup, multiple LEDs share a single common cathode (negative terminal). Each LED is then connected to a separate anode (positive terminal) through its own current-limiting resistor. This allows for individual control of each LED's illumination while simplifying the circuitry by reducing the number of connections needed compared to a common anode configuration for the same number of LEDs. When a positive voltage is applied to a specific anode, and the common cathode is connected to ground or a negative voltage source, that particular LED will illuminate. This configuration is often employed in applications where multiple LEDs need to be controlled independently, such as indicator lights on electronic devices or in certain display arrangements. The primary advantage is the reduction in the number of output pins required from a microcontroller or control circuit, making it a practical choice for space-constrained designs or when maximizing the use of available I/O pins is important.