LED as Zener diode. Design Note 37

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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Familiarize Electronic Components Part III – LED

This part is colourful because it deals with LEDs. LEDs are seen everywhere from indicators to room lighting. It is popularizing due to its long life and low current consumption. Power loss through heat generation is practically nil in LED. It operates in low voltage and low current and is the inevitable part of an electronic gadget.

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Code Reading Lamp

Here is a dual colour lamp to read the code printed on the Transistors and ICs. The code and number printed on the black coloured body of these components are difficult to read if the room light is low since the printing is in faint colour or as impressions. This LED lamp is useful to identify the components easily.

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