Candle Flicker LEDs are a new generation of LED which incorporate a tiny microprocessor. The LEDs mimic the burning action a real candle flame. Available in a standard 5mm size with a clear lens in either a Red or Yellow flicker colour.
Like other 5mm LEDs, Candle Flicker LEDs incorporate a processor. It varies the brightness , giving a “flickering” candle or flame look. These are an ideal alternative to candles in decorations and displays. They are also very popular in miniature models and model train installations.
Connecting To Candle Flicker LEDs
Connecting to a Candle Flicker LED is very simple and requires only a simple dropping resistor. The resistor goes in series with the LED and power/battery to limit current to 20mA. Each LED has two leads, an Anode (positive) and Cathode (negative). They need a Dropping Resistor to limit current to 15-20mA..
It is possible to connect many Candle Flicker LEDs to a single power supply source. Unlike other LEDs, each Candle Flicker LED must have its own series dropping resistor. As the Candle Flicker LED operates, it changes the current draw through the individual LED. A single dropping resistor for many LEDs will cause all LEDs to flicker at the same rate. The circuit support as many LEDs as required, each independently controlled.
The Dropping Resistor used is sized based on the LED model used and the power supply voltage to the LED. The circuit can run from a simple pair of AA batteries in a battery pack, up to a larger 9v battery to a DC power adapter. It will run for hours (days!) on a AA battery pack.
Selecting Dropping Resistor Value
From the chart below, you would select the model of Candle Flicker LED you have, the application voltage you wish to run it on. The chart will determine what value and power rating of the resistor. For example, to run a Yellow Candle Flicker LED on a 9v battery, the chart indicates a 330Ω ½ watt resistor.