Fun with LED. Simple Design 15


LED

LED is a wonderful semiconductor without which a circuit is generally incomplete. LEDs are used mainly as indicators to show whether the output of a particular section of the circuit is working or not. Let us see some simple circuits using LEDs that you can try.
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LED as Zener diode. Design Note 37


LED-as-Zener
What will do if you want a low voltage less than 3 volts as reference voltage for a circuit? Usually we use a low volt Zener to give low voltage to a particular section of the circuit. But Zener below 3.1 V is not available. So do this simple method. The LED can act a Zener to give a reference voltage. Each type of LED has a forward voltage drop that range between 1.7 V to 3.3 V. This forward voltage drop slightly increases when the input voltage increases. This is due to the increase in the luminosity of the LED. So let us exploit the LED to do the job of the Zener.
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