This is a simple diagram for LED indicator circuit which is the resilience of the nature of high light emitting diode (LED) make it suitable for ON / OFF indicator applications. Due to limitations on the operating voltage is low, the LEDs are usually applied to low voltage applications. This is the figure of the circuit.
In the picture above the zener diode used to limit the voltage and allows current to flow in reverse direction on the cycle where the current flow can’t flow through the LED. Without this zener, which it will now actually stop flowing since the capacitor block is now flowing in one direction only. Capacitor will determine the current setting options, approximately 4 mA to 20 mA and 100nF to 470nF.
In the picture above the zener diode used to limit the voltage and allows current to flow in reverse direction on the cycle where the current flow can’t flow through the LED. Without this zener, which it will now actually stop flowing since the capacitor block is now flowing in one direction only. Capacitor will determine the current setting options, approximately 4 mA to 20 mA and 100nF to 470nF.
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